WO2025219373A1 - Portable device for detecting a laser beam, display device and associated method - Google Patents

Abstract

According to one aspect, the invention relates to a portable device (1) for detecting a laser beam, the portable detection device comprising: - a support portion (10) comprising: a1) a device for autonomously powering the portable detection device, and b1) a holding element (12) for holding the portable detection device, - a detection portion (20) for detecting the laser beam, comprising: a2) an optical system (22) suitable for forming an image comprising the laser beam, the laser beam having a wavelength of less than 1.6 micrometres, b2) at least one sensor (24) suitable for detecting the laser beam on the image formed by the optical system and for providing an output signal associated with the detected laser beam, and - a computer configured to digitally process the output signal generated by the sensor so as to generate a digital image of the detected laser beam.

Description

DESCRIPTION

TITLE: Portable laser beam detection device, display device and associated method

TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention is that of the detection of laser beams.

[0002] In particular, the invention relates to a portable device for detecting a laser beam, a device for displaying the laser beam and a method for detecting the laser beam.

[0003] The present invention is particularly advantageously applicable to laser beams whose wavelength is in the near infrared range.

TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0004] Many industrial or research devices today involve the use of laser devices. These laser devices produce, in particular, a laser beam. By “laser beam”, we commonly understand unidirectional light radiation (i.e. propagating in a single direction).

[0005] The laser devices used require precise configuration, in particular to ensure the correct alignment of the laser beam. It is then necessary to ensure the alignment of the laser beam with the surface of the optical components involved, whether they are in reflection or transmission. It is then necessary to successfully visualize the laser beam to ensure its correct positioning and alignment.

[0006] To view a laser beam, it is for example known to use a viewing device equipped with a photocathode and an optical viewing system. This photocathode then allows the detection of the laser beam. The optical viewing system is in the form of a viewfinder (commonly called an "eyepiece") to which a user places his eye in order to view the laser beam. However, in practice, the user is often forced to remove his protective glasses to successfully view the laser beam. This is extremely dangerous for the user, particularly in the case of so-called class 3 lasers. [0007] Furthermore, in this type of visualization, the definition of the image of the observed scene is not necessarily satisfactory. This then makes the process of aligning the laser beam quite tedious to implement.

[0008] Furthermore, known display devices are based on analog signal processing which relies in particular on an analog photomultiplier device. This then limits the possibilities for processing this data (used in the display device).

SUMMARY OF THE INVENTION

[0009] The present invention then proposes to improve the detection and visualization of a laser beam by means of a device that is simple to use, effective and guarantees safety for users who handle it.

[0010] One aspect of the invention thus relates to a portable device for detecting a laser beam, the portable detection device comprising:

- a support part comprising: a1) an autonomous power supply device for the portable detection device, and b1) an element for holding the portable detection device,

- a laser beam detection part comprising: a2) an optical system adapted to form an image comprising the laser beam, the laser beam having a wavelength of less than 1.6 micrometers, b2) at least one sensor adapted to detect the laser beam on the image formed by the optical system and to provide an output signal associated with the detected laser beam, and

- a computer configured to digitally process the output signal generated by the sensor so as to generate a digital image of the detected laser beam.

[0011] Thus, the detection device according to the invention is particularly advantageous because it is in a compact form allowing it to be transported and used easily. In addition, the digital processing implemented by the computer allows the generation of better quality images. This then allows more reliable and precise detection of the laser beam. In addition, the use of the portable detection device according to the invention can be implemented more safely because the operator does not need to remove his protective glasses. Finally, thanks to the sensor included in the portable detection device, the latter is particularly suitable for detecting a laser beam in the near infrared range.

[0012] In addition to the characteristics which have just been mentioned in the preceding paragraph, the portable device for detecting a laser beam according to the invention may have one or more additional characteristics among the following, considered individually or according to all technically possible combinations:

[0013] - the detection part is offset relative to the support part of the portable detection device;

[0014] - the laser beam has a wavelength between 350 nanometers and 1.2 micrometers;

[0015] - a communication system is provided that is suitable for enabling the exchange of at least one piece of data with an external device;

[0016] - the data is the digital image or the output signal;

[0017] - the optical system comprises a system for separating incoming light radiation into a first portion and a second portion, said image being formed, by the optical system, from the first portion of the incoming light radiation; and

[0018] - the optical system being adapted to form another image from the second portion of the optical light radiation, the portable detection device further comprises another sensor adapted to provide another output signal associated with the second portion of the light radiation, the computer being configured to digitally process the other output signal, the digital image of the detected laser beam being generated on the basis of this other output signal.

[0019] Another aspect of the invention relates to a device for displaying a laser beam comprising:

- a portable laser beam detection device as previously introduced, and

- a display device adapted to display the digital image of the detected laser beam generated by the portable detection device. [0020] In addition to the characteristics which have just been mentioned in the preceding paragraph, the device for displaying a laser beam according to the invention may have one or more additional characteristics among the following, considered individually or according to all technically possible combinations:

[0021] - the display device is positioned in a portion of the portable detection device; and

[0022] - the display device is remote from the portable detection device.

[0023] Another aspect of the invention relates to a method of detecting a laser beam from a portable laser beam detection device as introduced previously, the detection method comprising steps of:

- acquisition of at least one image including the laser beam, and

- detection of the laser beam by locating the laser beam on the acquired image.

BRIEF DESCRIPTION OF THE FIGURES

[0024] Other characteristics and advantages of the invention will appear on reading the description, which can be read in conjunction with the figures. These figures are presented for information purposes only and in no way limit the invention.

[0025] [Fig. 1] Figure 1 represents, in functional form, a portable detection device according to the invention,

[0026] [Fig. 2] Figure 2 is a perspective representation of a first exemplary embodiment of the portable detection device according to the invention,

[0027] [Fig. 3] Figure 3 is a perspective representation of a second exemplary embodiment of the portable detection device according to the invention,

[0028] [Fig. 4] Figure 4 is a perspective representation of a third exemplary embodiment of the portable detection device according to the invention,

[0029] [Fig. 5] Figure 5 is a first perspective representation of an example of a device for displaying a laser beam according to the invention, [0030] [Fig. 6] Figure 6 is a second perspective representation of an example of a device for displaying a laser beam according to the invention,

[0031] [Fig. 7] Figure 7 represents, in the form of a flowchart, a first example of a method for detecting a laser beam in accordance with the invention, and

[0032] [Fig. 8] Figure 8 represents, in the form of a flowchart, a second example of a method for detecting a laser beam in accordance with the invention.

[0033] For clarity, identical or similar elements are identified by identical reference signs throughout the figures.

DETAILED DESCRIPTION

[0034] The present invention aims to improve the detection of a laser beam. More particularly, it proposes a detection device which is simple and practical to use, precise in detection and safe to use.

[0035] It relates more particularly to a portable device for detecting the laser beam. In the present description, the term “portable device” is understood to mean a device adapted to be easily transported by a user, comprising all of the measuring elements making it possible to implement this detection, is also transportable and operates autonomously in terms of energy (i.e. without needing to be permanently connected, by wire, to an energy source in order to operate).

[0036] In other words, the portable detection device according to the invention can be used and moved easily, without needing to be connected (by a cable) to a power source.

[0037] Figure 1 shows, in a schematic and functional manner, a portable device 1; 2; 100 for detecting a laser beam. For the sake of simplification, this portable device 1; 2; 100 for detecting a laser beam is also referred to as “detection device 1; 2; 100” in the present description.

[0038] Figure 2 represents a detection device 1 according to a first embodiment of the invention. Figure 3 represents a detection device 2 according to a second embodiment of the invention. Figure 4 represents a detection device 100 according to a third embodiment of the invention. [0039] As shown in Figures 1 to 6, this detection device 1; 2; 100 comprises a support part 10; 110, a detection part 20; 120 and a computer 30; 130.

[0040] The support part 10; 1 10 is the part of the detection device 1; 2; 100 making it possible to ensure the portable nature of the detection device 1; 2; 100. For this, the support part 10; 1 10 comprises a holding element 12; 112 and a device 14; 114 for autonomously supplying the detection device 1; 2; 100.

[0041] The holding element 12; 1 12 makes it possible to transport and/or place the detection device 1; 2; 100 during its use.

[0042] In the case of the first and second embodiments of the detection device 1; 2 shown in Figures 2 and 3, the holding element 12 comprises a base 12A and a handle 12B. The base 12A of the holding element 12 forms, for example, a support base for the detection device 1; 2. This base 12A is, for example, adapted to allow the detection device 1; 100 to be placed on a frame of equipment.

[0043] The handle 12B is adapted to allow the detection device 1; 2 to be held, for example during its use and/or its transport. Here, the handle 12B has an elongated shape provided with a handle.

[0044] In the case of the second embodiment of the detection device 100 shown in FIG. 4, the holding element 112 is in the form of a housing 112A. This housing 112A here forms a support base for the detection device 100. This housing 112A is for example adapted to allow the detection device 100 to be placed on a rack of equipment.

[0045] In the embodiment shown in Figure 4, the housing 112A comprises for example a magnetic element 113. This magnetic element 113 makes it possible in particular to keep the housing 112A fixed, temporarily but firmly (so as to avoid untimely movements of this housing when using the detection device), to a metal support. In practice, the optical tables on which laser devices are mounted are metallic. [0046] Here, this magnetized element 1 13 is coupled to a switch 1 13A allowing the “demagnetization” of the housing 1 12A so that the latter (and therefore the detection device) can be transported.

[0047] In practice, the holding element 12; 1 12 is for example formed from a molded polymer material.

[0048] Advantageously, as indicated previously, the present invention relates to a portable detection device 1; 2; 100. In order to ensure this energy-autonomous operation, the support part 10; 110 comprises the device 14; 114 for autonomously supplying the detection device 1; 100.

[0049] This device 14; 1 14 for autonomously supplying the detection device 1; 100 is for example in the form of a plurality of assembled batteries. Preferably, the batteries used here are rechargeable. In practice, these are for example Lithium-ion batteries (or “Li-ion” according to the notation commonly used).

[0050] This type of power supply is particularly advantageous because it allows the detection device 1; 2; 100 to have an energy autonomy of several hours. In particular here, this energy autonomy is at least 7 hours. The device 1; 2; 100 is then very practical to use because it can be used for a whole day (of work) without having to worry about its battery level.

[0051] In practice, the autonomous power supply device 14; 1 14 of the detection device 1; 2; 100 is for example housed in the holding element 12; 1 12.

[0052] As shown in Figure 5, the autonomous power supply device 14 of the detection device 1; 2; 100 is for example here fixed to the holding element 12. This fixing is for example implemented by snap-fastening the autonomous power supply device 14 onto the holding element 12.

[0053] In the case of the first embodiment of the detection device 1; 2 shown in Figures 2 and 3, the autonomous power supply device 14 is for example housed in a housing forming the base 12A. In the case of the second embodiment of the detection device 100 shown in Figure 4, the autonomous power supply device 114 is for example housed in the housing 112A. [0054] In order to implement the detection function, the detection device 1; 100 comprises the detection part 20; 120. This detection part 20; 120 is adapted to detect a laser beam present for example in a laser device used for an application of interest.

[0055] Advantageously according to the invention, the detection part 20; 120 is adapted to detect a laser beam having a wavelength of less than 1.6 micrometers (pm). Preferably, the detection part 20; 120 is adapted to detect a laser beam having a wavelength of between 350 nanometers (nm) and 1.2 pm. Thus, the detection device 1; 2; 100 is particularly advantageous for detection in the near infrared range.

[0056] As shown in FIG. 1, the detection part 20; 120 comprises an optical system 22; 25; 122 and at least one sensor 24; 124. In practice, this detection part 20; 120 comprises for example a portion 21; 121 of housing housing the optical system 22; 25; 120 and the sensor 24; 124.

[0057] The optical system 22; 25; 122 is adapted to form an image of a scene of interest. This scene of interest comprises the laser beam to be detected with the detection device 1; 2; 100 according to the invention. More particularly, the optical system 22; 25; 122 is adapted to receive light radiation coming from the scene of interest and to form a corresponding image of this scene of interest.

[0058] In the present description, the term “image” therefore refers to a visualization of a scene of interest. Here, this scene of interest comprises the laser beam reflecting or diffusing on objects at a given distance, on the sensor 24; 124. The arrangements and adjustments of the different elements included in the optical system 22; 25; 122 then make it possible to ensure the convergence of light radiation coming from different points of the scene of interest towards the sensor 24; 124.

[0059] In practice, the optical system 22; 25; 122 comprises for example an optical objective, that is to say it comprises a plurality of optical lenses and possibly one or more mirrors. The objective comprises a set of converging or diverging optical components. It comprises for example optical doublets (association of two optical lenses) or optical triplets. (combination of three optical lenses). Thus, the focus makes it possible to adjust the different optical components of the optical system 22; 25; 122 in order to ensure that the light radiation coming from different points of the scene of interest converges towards the sensor 24; 124.

[0060] Alternatively, the optical system may comprise any optical element capable of forming an image.

[0061] In the exemplary embodiment shown in FIG. 3, the optical system 25 also comprises a system 25A for separating the incoming light radiation. This system 25A for separating the incoming light radiation is adapted to separate the incoming light radiation into a first portion and a second portion. This separation is carried out as a function of the wavelength.

[0062] For example, the system 25A for separating the incoming light radiation is a so-called “cold” mirror which reflects the first portion of the light radiation and transmits the second portion of the radiation. For example, here, the system 25A for separating the incoming light radiation reflects the visible part (which corresponds to the first portion) of the incoming light radiation and transmits the infrared part (which corresponds to the second portion) of the incoming light radiation.

[0063] In this case, the optical system 25 is then adapted to form two distinct images, a first image from the first portion of the incoming light radiation and a second image from the second portion of the incoming light radiation.

[0064] The use of this light radiation separation system is particularly advantageous because it allows more precise detection of the laser beam. Indeed, as the infrared part of the incoming light radiation is isolated from the rest of the light radiation, the associated image provided by the optical system is “depolluted” from the rest of the light radiation of the scene of interest. In addition, this also makes it possible to improve the contrast of the digital image obtained at the output of the detection device 1; 2; 100 (described below).

[0065] Optionally, as can be seen in FIG. 1, the optical system 20; 120 may comprise a filter element 23 adapted to filter certain wavelengths of the incoming light radiation. This filter element 23 allows therefore in practice to filter a wavelength or a range of wavelengths which would prevent the proper detection of the laser beam. In other words, the filter element 23 is advantageous for transmitting predefined ranges of wavelengths (and therefore for filtering the wavelength(s) which interfere with the detection of the laser beam).

[0066] In practice, the filter element 23 is for example a band-pass filter, or a low-pass filter, or even a high-pass filter.

[0067] For example, the so-called “Doubled Yag” wavelength of the order of 532 nm, associated with the “green” color of visible radiation, can cause overexposure which would impair the proper detection of the laser beam. The filter element then makes it possible, for example, to filter these wavelengths causing this overexposure. The use of the filter element in this example makes it possible to maintain a visualization of the light radiation beyond 541 nm, without, of course, cutting off the laser beam to be detected (in the near infrared range).

[0068] In practice, the filter element is, for example, a filter used in laser protective glasses or in laser hoods. It is, for example, a filter meeting the EN 207 standard.

[0069] The filter element 23 is here positioned at the end of the optical system 22; 25; 122. More particularly, this filter element 23 is fixed at the free end of the optical system 22; 25; 122 (the incoming light radiation therefore first passes through the filter element 23 before entering the optical system 22; 25; 122).

[0070] This attachment is for example implemented by means of magnetic cooperation, in order to allow easy assembly and disassembly of the filter element.

[0071] As shown in Figure 1, the detection part 20; 120 also comprises at least one sensor 24; 124. This sensor 24; 124 is adapted to detect the laser beam on the image formed by the optical system 22; 25; 122 and to provide an output signal associated with the detected laser beam.

[0072] The sensor 24; 124 is therefore here adapted for detection in the near infrared range. [0073] Advantageously here, the sensor 24; 124 has at least 2 million pixels. Preferably, the sensor 24; 124 has between 2 and 12 million pixels. This makes it possible to obtain a resolution of the output signal that is much better than that of existing devices. Furthermore, the sensor 24; 124 according to the invention also has better sensitivity over the wavelength range considered here than the sensors of known devices.

[0074] In practice, this better sensitivity is obtained here because the sensor 24; 124 according to the invention comprises a plurality of photosensitive sites which are illuminated by their rear face. This then allows better penetration of the photons into these photosensitive sites because the distance traveled by the electrons is as short as possible so that the losses of absorption time are limited.

[0075] Advantageously according to the invention, the sensor 24 has a read noise of less than 3 electrons (e). By definition, the read noise (also called “temporal dark noise” in the field of imaging) corresponds to the noise present in the sensor when no signal reaches the sensor. This read noise is generally caused by the electronic components included in the sensor.

[0076] Here, preferably, this reading noise is between 0.2 and 3 e. These very low values are particularly advantageous and make it possible to obtain a very high quality of the laser beam image. Such reading noise values while ensuring a high quality of the image obtained cannot be obtained with photodiodes, energy detectors or profilometers.

[0077] Furthermore, the sensor 24 has an exposure time of between 150 microseconds (ps) and 5 seconds.

[0078] The sensor 24 may also comprise a mechanism known as a “rolling shutter” (or “rolling shutter” according to the commonly used terminology of Anglo-Saxon origin). It may also comprise a mechanism for removing “dead” pixels from the image, i.e. faulty pixels (which should light up but which appear black or which are permanently stuck on a particular color).

[0079] The sensor used in the present invention is for example a sensor used in astrophysics. [0080] In the embodiment shown in Figure 3, the detection device comprises another sensor 28. This other sensor 28 is adapted to generate another output signal from the image formed by the optical system 25 on the basis of the first portion of the incoming light radiation. In other words, this other sensor 28 is adapted to determine the output signal corresponding to the entire scene of interest collected by the optical system without the laser beam. This other output signal can then be used to “depollute” the output signal associated with the detected laser beam in order to allow more precise detection thereof.

[0081] As shown in Figure 1, the detection device 1; 100 also comprises the computer 30; 130. This computer 30; 130 comprises at least one processor programmed to interpret instructions in the form of a computer program, an electronic card whose steps of the examples of methods described below are described in silicon, or even a programmable electronic chip.

[0082] This computer 30; 130 is associated with a memory 32; 132 programmed to store instructions making it possible to implement the examples of methods in accordance with the invention described below. For example, the memory 32; 132 is programmed to store a computer application, consisting of computer programs comprising instructions whose execution by the processor allows the implementation by the computer of the examples of methods described below.

[0083] In practice here, the calculator 30; 130 is for example configured to digitally process the output signal generated by the sensor 24; 28; 124. In the present description, “digital processing” is understood to mean methods of processing (filtering, compression, etc.), analysis and interpretation of digitized signals implemented by digital machines (for example computers, processors or dedicated circuits). Thus, advantageously according to the invention, the calculator 30; 130 of the detection device 1; 2; 100 is programmed to allow improved processing of the signals received compared to known devices which rely on analog signal processing.

[0084] Here, the computer 30; 130 is configured to generate a digital image of the detected laser beam (from the output signal provided by the sensor 24; 124). Advantageously, thanks to this digital processing, the computer allows then processing and analysis of this digital image in order to implement precise detection of the laser beam of interest.

[0085] As shown in Figure 1, the detection device 1; 2; 100 also comprises a communication system 40; 140. This communication system 40; 140 is adapted to allow the exchange of at least one piece of data with an external device (not shown). This external device is for example (and in a non-exhaustive manner) a computer, an external display device (such as a screen), a mobile telephone, a remote server or any other device adapted to receive the data from the detection device 1; 2; 100.

[0086] The data exchanged is for example here the digital image generated by the computer 30; 130. Alternatively, the data can be the output signal provided by the sensor 24; 124.

[0087] The communication system 40; 140 is based, for example, on a wireless communication protocol of the Wi-Fi or Bluetooth type.

[0088] This communication system 40; 140 is particularly advantageous for enabling simultaneous transmission to several workstations of the digital image generated for the detected laser beam in order to enable, in particular, collaborative analysis of the data obtained. This transmission of the generated digital image is possible here thanks to the digital processing implemented by the computer. Indeed, the known devices of the state of the art relied on analog processing which did not allow this wireless transmission of the data. On the contrary, here, thanks to the invention and the digital processing implemented, the generated digital image can be transmitted simultaneously to different workstations (and therefore enable collaborative work).

[0089] Finally, the detection device 1; 2; 100 comprises a start-up control device (not shown) allowing the detection device 1; 2; 100 to be started, put on standby and stopped. This start-up control device is, for example, a switch. Alternatively, this start-up control device may be in a tactile or haptic form.

[0090] In the case of the embodiments shown in Figures 2 and 3, the support part 10 and the detection part 20 are directly assembled between them, that is to say that no additional element is used to make the connection between these two parts.

[0091] On the contrary, in the case of the exemplary embodiment shown in FIG. 4, the detection part 120 is offset relative to the support part 110 of the detection device 100. In other words, the detection part 120 and the support part 110 are spaced apart from each other, while being connected to each other (for example by a cable). This connection is for example formed by a flexible cable, with or without articulation. In practice here, a cable harness allows the exchange of data between the sensor 124 and the computer 130.

[0092] In other words, in this example, the detection device 100 is in an endoscopic version. The detection part 120 is then adapted to be introduced into more restricted spaces to allow detection of the laser beam.

[0093] Figure 2 is a perspective representation of a first example embodiment of the detection device 1. In this first example, the detection device 1 comprises a sensor 24. In addition, in this example, the detection part 20 and the support part 10 are directly assembled together.

[0094] Figure 3 is a perspective representation of a second exemplary embodiment of the detection device 2. This second exemplary embodiment is similar to the first exemplary embodiment. The main difference lies in the fact that, in this case, the detection device 2 comprises the system 25A for separating the incoming light radiation and two sensors 24, 28. Here, as described previously, the system 25A for separating the light radiation allows the separation of the incoming light radiation into a first portion and a second portion. The optical system 25 is then adapted to form an image associated with the first portion of the incoming light radiation and another image associated with the second portion of the incoming light radiation. Each of the two sensors 24, 28 is then adapted to respectively provide an output signal and another output signal from the image and the other image formed.

[0095] This second embodiment is particularly advantageous because it allows more precise detection of the laser beam. Indeed, since, thanks to the light radiation separation system, it is possible to isolate the part infrared of the incoming light radiation is isolated from the rest of the light radiation, the associated image provided by the optical system is “depolluted” from the rest of the light radiation of the scene of interest.

[0096] Figure 4 is a perspective representation of a third exemplary embodiment of the detection device 100. This third exemplary embodiment corresponds to an endoscopic version of the detection device 100. As can be seen in Figure 4, the detection part 120 is offset relative to the support part 110. More particularly here, the detection part 120 and the support part 110 are connected to each other by a cable 150. This cable 150 is here flexible in order to allow the introduction of the detection part 120 into restricted spaces.

[0097] Whatever the embodiment, the detection device 1; 2; 100 according to the invention is particularly advantageous because it is in a compact form allowing it to be transported and used easily. In addition, the digital processing implemented by the computer allows the generation of better quality images. This then allows more reliable and precise detection of the laser beam. In addition, the use of the portable detection device according to the invention can be implemented more safely because the operator does not need to remove his protective glasses. Finally, thanks to the sensor included in the portable detection device, the latter is particularly suitable for the detection of a laser beam in the near infrared range.

[0098] The present invention also relates to a device 200 for displaying a laser beam. The display device 200 comprises the device 1; 2; 100 for detecting the laser beam as introduced previously and a display device 250.

[0099] The display device 250 is adapted to display the digital image of the laser beam generated by the detection device 1; 2; 100 (and more particularly generated by the computer 30; 130). The display device 250 is for example in the form of a screen. This screen is for example a touch screen on which it is possible to select at least one command. This command selection may for example correspond to a processing command or a digital image analysis command. [00100] The display device 250 is also adapted to display a battery level of the detection device 1; 2; 100. This battery level of the detection device 1; 2; 100 therefore makes it possible to monitor in real time the state of the power supply device 14; 1 14 of the detection device 1; 2; 100.

[00101] In the embodiment shown in Figures 5 and 6 of the display device 200, the display device 250 is integrated into the detection device 1; 2. More particularly, the display device 250 is positioned in the support part 10 of the detection device 1; 2.

[00102] This version of the display device 200 is particularly advantageous because it forms a compact portable version of the detection device while also allowing the display of the detected laser beam.

[00103] Alternatively (not shown), the display device may be remote from the detection device. In such an alternative, in order to maintain the portable nature of the detection device, the display device is connected to the detection device by a wireless link. More particularly, communication between the display device and the detection device is carried out via the communication system of the detection device.

[00104] This variant embodiment is for example implemented in the case of an endoscopic version of the detection device because adding a display device would make the detection device more bulky.

[00105] Advantageously according to the invention, the display device according to the invention is a compact and portable device which makes it possible to display the laser beam detected by the portable detection device. The use of this display device is safe because the operator does not need to remove his protective glasses to display the detected laser beam.

[00106] The detection device 1; 2; 100 is then used for detecting a laser beam which has a wavelength range in the near infrared region. In this context, the present invention also relates to a method for detecting a laser beam from the detection device 1; 2; 100 introduced previously.

[00107] Figure 7 represents, in the form of a flowchart, a first example of the detection method according to the present invention. This first example of the detection method finds application particularly in the case of the examples of the detection device 1; 2 shown in figures 2 and 3.

[00108] As shown in Figure 7, this detection method begins with a step E2 of starting the detection device 1; 2. This starting is for example carried out by pressing the start-up control device present on the detection device 1; 2.

[00109] In step E4, the detection device 1; 2 begins to acquire images of the scene of interest (in which the laser beam is to be detected). The acquired images in question here correspond to the digital images generated by the computer 24; 124. It should be noted that these images are acquired in real time and continuously when the detection device 1; 2 is operating. In the present description, “real time” means that the image acquisition is carried out at a high frequency. For example, according to the conventional standard, 30 images are acquired per second.

[00110] This image acquisition is for example triggered automatically as soon as the detection device 1; 2 is started. Alternatively, this image acquisition can be triggered manually by an operator when the latter is ready and has properly positioned the detection device.

[00111] It should be noted that the images are acquired continuously here but that for the sake of simplification this continuous acquisition is not represented in any particular way in Figure 7.

[00112] The detection method then continues with a step E6 of displaying the images acquired in step E4 via the display device 250. This display is also implemented in real time and continuously.

[00113] As shown in Figure 7, the detection method continues with a step E8 of preprocessing the displayed images. This preprocessing step E8 aims to enable an improvement in the detection and visualization of the laser beam.

[00114] This involves, for example, a filtering step to remove a portion of the radiation to avoid glare. For example, the green component of the light radiation may be filtered. It may also involve the positioning of a marker element on the displayed image to assist in detecting the laser beam. This marker element is, for example, a reticle. [00115] As shown in Figure 7, this preprocessing step E8 is optional. It can therefore be omitted. In the case where this step E8 is not implemented, step E6 is directly followed by step E10.

[00116] The detection method then comprises a step E10 of selecting a reduced area of the displayed image on which the laser beam can be detected. This selection is for example implemented manually by an operator who delimits an area of the image comprising the laser beam.

[00117] Alternatively, this selection can for example be implemented automatically, for example by means of an artificial neural network trained to determine a reduced area of an image, this reduced area comprising the laser beam.

[00118] This selection step has the advantage of making the detection of the laser beam more precise. However, it can be omitted.

[00119] As shown in Figure 7, the detection method continues in step E12. During this step, the quality of the displayed image is evaluated. This quality of the image is for example evaluated on the basis of a quality criterion. This quality criterion is based for example on a sharpness criterion and/or an overexposure criterion. The evaluation of the quality criterion is based for example on the evaluation of the dynamics of the image in order to guarantee sufficient contrast (attesting to satisfactory quality of the image).

[00120] If the quality of the image is not considered satisfactory (i.e. the quality criterion is not satisfied), the detection method continues at step E14. For example, when the overexposure criterion indicates that the overexposure has been exceeded in the acquired image, the quality of the image is not considered satisfactory (the operator may also be warned of this).

[00121] During this step E14, the computer 24 commands an adjustment of the parameters of the optical system 22; 25. In particular, the computer 24 commands for example an adjustment of the focus of the optical system 22; 25. The exposure time of the acquisition and the associated gain can for example be modified, in particular independently, in order to improve the sensitivity of image acquisition. This is particularly advantageous in the case of low-power laser beams. [00122] The computer 24 can also control the automatic adjustment of the exposure time on the basis of an analysis of the frequency of the detected laser beam. This is particularly advantageous for enabling acquisition stabilization in the case of the detection of a laser beam having a low frequency (and therefore generating “stroboscopic” images).

[00123] Then, the detection method resumes at step E4 of displaying the images.

[00124] If, in step E12, the quality of the images is considered satisfactory, the detection method continues in step E16. This step E16 corresponds to a step of locating the laser beam (and therefore of determining associated positioning data). This locating is for example implemented by positioning a locating element on the displayed image in order to indicate the position of the laser beam. This locating element is for example a reticle.

[00125] This location is for example implemented manually by an operator who points the laser beam at the image displayed on the display device 250.

[00126] Alternatively, this tracking can for example be implemented automatically, for example by means of an artificial neural network trained to determine the position of the laser beam on an image.

[00127] This positioning data is for example then transmitted (step E18) to an external device or a remote server in order to be used in the context of the use of the detected laser beam. As shown in Figure 7, this step E18 is optional and can be omitted (the operator can for example act directly on the alignment or positioning of the laser beam without the positioning data being transmitted).

[00128] In the context of this detection method, it should be noted that at each step, the communication system 40 can transmit the processed data to an external device or a remote server. For example, the acquired images can be retransmitted simultaneously to another display device (which can then be viewed by operators other than the one handling the detection device). This can in particular help with the selection of the reduced area comprising the laser beam or help with the detection of the laser beam itself. [00129] Furthermore, it should also be noted that the computer 24; 124 can control the storage of the generated digital images, for example in the memory 32; 132.

[00130] Figure 8 represents, in the form of a flowchart, a second example of the detection method according to the present invention. This second example of the detection method finds application particularly in the case of the example of the detection device 100 shown in Figure 4. In other words, this second example of the detection method is particularly advantageous in the case of the detection device 100 in its endoscopic version.

[00131] As shown in FIG. 8, this detection method begins with a step E102 of starting the detection device 100. This starting is for example carried out by pressing the start-up control device present on the detection device 100 (more particularly present on the support part 110 of the detection device 100).

[00132] In step E104, the computer 124 initiates wireless communication with an external device. More particularly, via the communication system 140, the computer 124 establishes a wireless connection with the external device in order to enable the exchange of data. This external device is for example a display device (not shown) positioned at a distance from the detection device 100.

[00133] Steps E106 to E120 are similar to steps E4 to E18 described previously in the context of the first example of the detection method. The main difference lies in the fact that these steps E106 to E120 are implemented remotely. Steps E106 to E120 are not described in detail in the following.

[00134] In step E106 (similar to step E4 introduced previously), the detection device 100 begins to acquire images of the scene of interest (in which the laser beam is to be detected). The acquired images in question here correspond to the digital images generated by the computer 124. It should be noted that these images are acquired in real time and continuously when the detection device 100 is operating. [00135] The detection method then continues with a step E108 of displaying the images acquired in step E106 via the display device 270. In practice, this display is implemented after transmission, by the communication system 140, of the acquired images.

[00136] As shown in Figure 8, the detection method continues with a step E110 of preprocessing the displayed images (similar to step E8 described previously). As shown in Figure 8, this preprocessing step E110 is optional. It can therefore be omitted.

[00137] The detection method then comprises a step E1 12 of selecting a reduced area of the displayed image on which the laser beam can be detected. This step E1 12 is similar to step E10 described previously. This step E1 12 is also optional.

[00138] As shown in Figure 8, the detection method continues in step E1 14 (similar to step E12). In this step, the quality of the displayed image is evaluated.

[00139] If the quality of the image is not considered satisfactory (i.e. the quality criterion is not satisfied), the detection method continues at step E116 (similar to step E14). During this step, the computer 124 commands an adjustment of the parameters of the optical system 122.

[00140] If, in step E1 14, the quality of the images is considered satisfactory, the detection method continues in step E1 18 (similar to step E16 introduced previously). This step E1 18 corresponds to a step of locating the laser beam (and therefore of determining associated positioning data).

[00141] This positioning data is for example then transmitted (step E120) to an external device or a remote server in order to be used in the context of the use of the detected laser beam. As shown in FIG. 8, this step E120 is optional and can be omitted.

[00142] It should be noted that in order to limit the energy consumption of the autonomous power supply device 14; 114 (in particular to allow use of the detection device 1; 2; 100 for a longer period), the present invention also relates to a particular management of this detection device 1; 2; 100. [00143] In particular, manual management of the energy consumption of the autonomous power supply device 14; 1 14 is provided. This manual management includes two options.

[00144] A first option corresponds to a standby option. This standby option is for example implemented by means of a short press on the start-up control device of the detection device 1; 2; 100. By “short press”, is meant a press, on the start-up control device, of a duration of less than one second.

[00145] A second option corresponds to a shutdown option. This shutdown option is implemented, for example, by means of a long press on the start-up control device. By “long press” is meant a press on the start-up control device lasting on the order of a few seconds.

[00146] Alternatively, the management of the energy consumption of the autonomous power supply device 14; 114 may be automatic. In this case, the standby and shutdown of the detection device 1; 2; 100 are controlled by the computer 30; 130. For example, when the computer 30; 130 detects a period of inactivity at, for example, the sensor 24; 28; 124 of a predetermined duration, it controls the standby of the detection device 1; 2; 100. This predetermined duration is, for example, of the order of 5 seconds. When this period of inactivity is greater than another predetermined duration, the computer 24; 124 controls the shutdown of the detection device 1; 2; 100. This other predetermined duration is, for example, of the order of one minute.

[00147] When the detection device 1; 2; 100 is stopped, it can be started again by pressing the start control device.

[00148] Advantageously, the detection and visualization devices according to the present invention have a compact shape allowing them to be transported and used easily. In addition, the digital processing implemented by the computer allows the generation of better quality images. This then allows more reliable and precise detection of the laser beam. In addition, the use of the devices according to the invention can be implemented more safely because the operator does not need to remove his protective glasses. Finally, thanks to the sensor included in the portable detection device, the latter is particularly suitable for detecting a laser beam in the near infrared range.

Claims

[Claim 1] Portable device (1; 2; 100) for detecting a laser beam, the portable detection device (1; 2; 100) comprising: - a support part (10; 110) comprising: a1) a device (14; 114) for autonomously supplying the portable detection device (1; 2; 100), and b1) a holding element (12; 112) for the portable detection device (1; 2; 100), - a detection part (20; 120) of the laser beam comprising: a2) an optical system (22; 25; 122) adapted to form an image comprising the laser beam, the laser beam having a wavelength of less than 1.6 micrometers, b2) at least one sensor (24; 28; 128) adapted to detect the laser beam on the image formed by the optical system (22; 25; 122) and to provide an output signal associated with the detected laser beam, and - a computer (30; 130) configured to digitally process the output signal generated by the sensor (24; 28; 128) so as to generate a digital image of the detected laser beam. [Claim 2] A portable detection device (100) according to claim 1, wherein the detection portion (120) is offset relative to the support portion (110) of the portable detection device (100). [Claim 3] Portable detection device (1; 2; 100) according to claim 1 or 2, in which the laser beam has a wavelength between 350 nanometers and 1.2 micrometers. [Claim 4] Portable detection device (1; 2; 100) according to any one of claims 1 to 3, in which a communication system (40; 140) is provided, adapted to allow the exchange of at least one item of data with an external device. [Claim 5] Portable detection device (1; 2; 100) according to claim 4, in which the data is the digital image or the output signal. [Claim 6] Portable detection device (2) according to any one of claims 1 to 5, in which the optical system (25) comprises a separation system (25A) of incoming light radiation into a first portion and a second portion, said image being formed, by the optical system (25), from the first portion of the incoming light radiation. [Claim 7] Portable detection device (2) according to claim 6, in which, the optical system (25) being adapted to form another image from the second portion of the optical light radiation, the portable detection device (2) further comprises another sensor (28) adapted to provide another output signal associated with the second portion of the light radiation, the computer (30) being configured to digitally process the other output signal, the digital image of the detected laser beam being generated on the basis of this other output signal. [Claim 8] Device (200) for displaying a laser beam comprising: - a portable device (1; 2; 100) for detecting the laser beam according to any one of claims 1 to 7, and - a display device (250) adapted to display the digital image of the detected laser beam generated by the portable detection device (1; 2; 100). [Claim 9] A display device (200) according to claim 8, wherein the display device (250) is positioned in a portion of the portable detection device (1; 2). [Claim 10] A display device according to claim 8, wherein the display device is remote from the portable detection device. [Claim 1 1 ] A method of detecting a laser beam from a portable laser beam detection device (1; 2; 100) according to any one of claims 1 to 7, the detection method comprising steps of: - acquisition of at least one image including the laser beam, and - detection of the laser beam by locating the laser beam on the acquired image.