HK1218164B - Security inspection equipment and radiation detection method - Google Patents

Description

Security inspection equipment and radiation detection method

Technical Field

The present invention relates to the field of security inspection, in particular to a security inspection device and a ray detection method.

Background Art

With the advancement of science and technology, security inspection equipment is now widely used in airports, customs, subways, and other departments. For highway security inspections, X-ray transmission equipment is commonly used to scan objects. X-rays emitted by an X-ray source pass through a collimator to form a scanning sector. A detector receives the X-rays that illuminate the inspected object and, through processing, obtains internal information about the object. This security inspection method is widely used, simple in structure, and easy to operate. However, because it utilizes the X-ray transmission principle for imaging, it has difficulty detecting low-density materials such as explosives and drugs.

X-ray backscatter technology is highly effective at detecting low-density materials. Existing X-ray backscatter inspection equipment uses a flywheel that rotates around the center of the radiation source, forming a pencil beam. This pencil beam lands on the inspected object, forming a flying spot. A backscatter detector collects X-ray backscatter at any given moment and processes it to obtain material information. Through continuous scanning, it can process and obtain information about the entire interior of the inspected object, particularly highlighting materials with low atomic numbers, such as explosives and drugs. This invention is convenient and practical, but because the imaging principle of this device is to absorb backscattered X-rays and then generate an image, it is not effective for detecting explosives and drugs hidden behind confidential materials. When explosives are placed behind a steel plate, the backscattered X-rays are blocked by the plate and cannot reach the backscatter detector. It also has poor detection effects on metal weapons. Furthermore, this one-sided backscatter imaging is ineffective for observing the interior of the opposite side of the inspected object. Effectively observing both sides of the inspected object requires two inspection passes, which is cumbersome.

Summary of the Invention

An object of the present invention is to provide a more reliable security inspection device.

According to one aspect of the present invention, a security inspection device is proposed, comprising: a radiation emitting device; and a radiation detector; wherein the radiation detector comprises: a forward scattering detector, located on the opposite side of the object to be measured relative to the radiation emitting device; the radiation detector further comprises: a backscattering detector, located between the radiation emitting device and the object to be measured; and/or a transmission detector, located on the opposite side of the object to be measured relative to the radiation emitting device.

Optionally, the ray emitting device is used to emit fan-shaped ray beams and flying-spot ray beams.

Optionally, the ray emitting device includes: a ray source located in the center of the ray emitting device; a spatial modulator located between the ray source and the backscatter detector, including a fixed shielding plate, and a rotating shielding body located between the object to be measured and the fixed shielding plate.

Optionally, the rotating shield includes one or more slits and one or more through holes.

Optionally, the transmission detector includes a plurality of detector modules, and according to the different positions of each detector module in the transmission detector, the placement angle of each detector module is adapted to the incident direction of the ray.

Optionally, the placement angle of the detector module being adapted to the incident direction of the ray includes: a detection surface of the detector module being perpendicular to the incident direction of the ray.

Optionally, the transmission detector includes a plurality of detector units consisting of predetermined detector modules arranged in parallel; according to the different positions of each detector module in the transmission detector, the placement angle of each detector module is adapted to the incident direction of the rays: according to the different positions of each detector unit in the transmission detector, the detection surface direction of each detector unit is adapted to the incident direction of the rays.

Optionally, the transmission detector is in the shape of a flat plate or a curved surface convex toward the opposite side of the object to be measured.

Optionally, a transport vehicle is also included for carrying and moving the radiation emitting device and the radiation detector.

Optionally, it also includes a cantilever, one end of the cantilever is connected to the transmission detector and the forward scattering detector, and the other end is connected to the transport vehicle; the transport vehicle carries the ray emitting device inside, and the side of the transport vehicle is connected to the backscattering detector.

Optionally, the cantilever comprises a folding mechanism and a rotating mechanism for folding and rotating the cantilever.

Optionally, a processor is further included, which is used to receive detection signals from the forward scattering detector, the back scattering detector and the transmission detector, and analyze the object to be detected.

Optionally, a controller is further included for controlling the folding and rotation of the cantilever.

Such security inspection equipment has a forward scattering detector, which, when used in conjunction with a backscattering detector, can reduce detection blind spots and optimize the detection of internal information on the opposite side of the radiation source; when used in conjunction with a transmission detector, it can simultaneously detect high-density and low-density materials; using a forward scattering detector, a backscattering detector and a transmission detector together can reduce detection blind spots while simultaneously detecting high-density and low-density materials, further optimizing the detection effect of the object to be tested and improving the accuracy of detection.

According to another aspect of the present invention, a ray detection method is proposed, comprising: emitting a fan-shaped ray beam and a flying-spot ray beam toward an object to be detected by a ray emitter; acquiring detection data through a detector, comprising: acquiring forward scattering data of the object to be detected by a forward scattering detector; further comprising: acquiring transmission data of the object to be detected by a transmission detector; and/or acquiring back scattering data of the object to be detected by a back scattering detector; and acquiring detection information based on the forward scattering data, the back scattering data, and/or the transmission data.

Optionally, using a ray emitter to emit a fan-shaped ray beam and a flying-spot ray beam toward the object to be measured includes: using a ray emitter that alternately emits a fan-shaped ray beam and a flying-spot ray beam to emit rays toward the object to be measured.

Optionally, the method further includes: displaying a detection image according to the detection information;

Optionally, the method further includes: marking prohibited objects or issuing warnings in the objects to be detected according to the detection information.

This approach, combining forward scatter data with backscatter data, reduces blind spots and optimizes detection of internal information on the opposite side of the radiation source. Acquiring forward scatter data and using it in conjunction with a transmission detector allows for simultaneous detection of both high- and low-density materials. The combined consideration of forward scatter, backscatter, and transmission data reduces blind spots and enables simultaneous detection of both high- and low-density materials. This approach optimizes detection of the object under test and improves detection accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

FIG1 is a schematic diagram of an embodiment of a security inspection device according to the present invention.

FIG2 is a schematic diagram of an embodiment of a ray emitting device in a security inspection device according to the present invention.

FIG. 3 a is a schematic diagram of a transmission detector according to an embodiment of the present invention.

FIG. 3 b is a schematic diagram of another embodiment of a transmission detector of the present invention.

FIG3 c is a schematic diagram of another embodiment of a transmission detector according to the present invention.

FIG3 d is a schematic diagram of yet another embodiment of a transmission detector according to the present invention.

FIG4 is a schematic diagram of another embodiment of the security inspection device of the present invention.

FIG5 is a schematic diagram of another embodiment of the security inspection device of the present invention.

FIG6 is a flow chart of an embodiment of a ray detection method of the present invention.

DETAILED DESCRIPTION

The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

A schematic diagram of an embodiment of the security inspection equipment of the present invention is shown in Figure 1. Reference numeral 1 represents a radiation emitting device that emits radiation 6 toward an object 5 to be inspected. The radiation detector of the security inspection equipment includes a forward scatter detector 4, located on the opposite side of the object 5 to the radiation emitting device 1, capable of acquiring forward scatter data. The radiation detector may also include a transmission detector 4, located on the opposite side of the object to be inspected to the radiation emitting device, capable of acquiring transmission data. The radiation detector may also include a backscatter detector 2, located between the object 5 to be inspected and the radiation emitting device 1, capable of acquiring backscatter data.

Such security inspection equipment has a forward scattering detector, which, when used in conjunction with a backscattering detector, can reduce detection blind spots and optimize the detection of internal information on the opposite side of the radiation source; when used in conjunction with a transmission detector, it can simultaneously detect high-density and low-density materials; using a forward scattering detector, a backscattering detector and a transmission detector together can reduce detection blind spots while simultaneously detecting high-density and low-density materials, further optimizing the detection effect of the object to be tested and improving the accuracy of detection.

In one embodiment, the radiation emitting device can emit a fan beam and a flying spot beam. The fan beam passes through the object to be measured and reaches a transmission detector, where the transmission detector acquires transmission data. The flying spot beam, after being scattered by the object to be measured, reaches a forward scattering detector and a backscattering detector, where forward scattering data and backscattering data are acquired.

Such security inspection equipment can emit two types of ray beams, one for the transmission detector and the other for the scattering detector to obtain transmission data and the other for scattering data, thereby improving the detection speed and optimizing the detection effect.

Figure 2 shows a schematic diagram of the radiation emitting device of the security inspection equipment of the present invention. Reference numeral 11 represents a radiation source located at the center of the radiation emitting device, which emits radiation toward the object under test. The radiation emitting device also includes a spatial modulator, located between the radiation source and the backscatter detector. This modulator adjusts the radiation emitted by radiation source 11, thereby controlling the radiation emitted by the radiation emitting device. In one embodiment, the spatial modulator comprises a fixed shielding plate 12 and a rotating shielding body 13. The fixed shielding plate 12 causes the radiation generated by radiation source 11 to be emitted in a predetermined direction at a predetermined angle, which can be 120 degrees. The rotating shielding body is located between the object under test and the fixed shielding plate. The rotating shielding body has a slit 15 and a through hole 14, and rotates at a predetermined rate. When radiation passes through through hole 14, a flying spot beam is formed; when radiation passes through slit 15, a fan-shaped beam is formed. The radiation emitted by the radiation emitting device varies over time. In one embodiment, the rotating shielding body has at least one slit and at least one through hole, and the number of slits and through holes can be adjusted as needed.

Such security inspection equipment has a ray emitting device that can periodically form fan-shaped ray beams and flying-spot ray beams, which are used for transmission detection and scattering detection respectively. A single ray emitting device can be used to emit both ray beams, reducing the volume of the security inspection equipment and creating conditions for simultaneously acquiring transmission data and scattering data.

In one embodiment, the transmission detector of the present invention includes multiple detector modules. Each detector module is positioned at an angle adapted to the incident direction of the radiation, depending on its position within the transmission detector. In one embodiment, the detection surfaces of the detector modules are adjusted perpendicular to the incident direction of the radiation. Unlike conventional detector modules, which are arranged in a regular, parallel pattern, these transmission detectors are positioned at different angles to better capture radiation passing through the object being measured, thereby reducing detection blind spots.

In one embodiment, a schematic diagram of a transmission detector is shown in Figure 3a. The flat-plate transmission detector 3 includes multiple detector modules 31. Rays 6 pass through the object to be measured and reach the transmission detector 3. The tilt angle of each detector module 31 varies depending on its height and position. The overall flat shape of this transmission detector facilitates installation. The internal angle is adjusted on a module-by-module basis to minimize blind spots.

In one embodiment, a schematic diagram of a transmission detector is shown in Figure 3b. The transmission detector 3 comprises multiple detector units 32, each composed of a number of detector modules 31 arranged in parallel. The detector modules 31 within each detector unit 32 have the same tilt angle, but the tilt angle varies depending on the position and height of the detector unit. This transmission detector has an overall flat shape for ease of installation, and the internal angle can be adjusted on a per-unit basis, facilitating installation and adjustment.

In one embodiment, a schematic diagram of a transmission detector is shown in Figure 3c. The transmission detector 3 is an arc-shaped surface that bulges toward the side opposite the object being measured and includes multiple detector modules 31. This type of transmission detector can reduce the distance difference between the radiation passing through the transmission detector surface and reaching the detector modules, thereby improving detection accuracy.

In one embodiment, a schematic diagram of a transmission detector is shown in Figure 3d. The transmission detector 3 has an overall curved shape, protruding toward the side opposite the object to be measured. It internally comprises multiple detector units 32, each composed of a number of detector modules 31 arranged in parallel. The detector modules 31 within each detector unit 32 have the same tilt angle, but the tilt angle varies depending on the position and height of the detector unit. This transmission detector can reduce the distance difference between the radiation passing through the transmission detector and reaching the detector modules, improving detection accuracy. The internal angle can be adjusted on a per-unit basis, facilitating installation and adjustment.

A schematic diagram of another embodiment of the security inspection equipment of the present invention is shown in FIG4 . The forward scatter detector 2 and the radiation emitting device are mounted or placed on a transport vehicle 7 . This type of security inspection equipment occupies a small footprint, is easy to transport, and is more flexible and maneuverable, enabling flexible deployment in response to emergencies.

A schematic diagram of another embodiment of the security inspection device of the present invention is shown in Figure 5. The security inspection device also includes a cantilever 8, one end of which is connected to the transmission detector and the forward scatter detector, and the other end is connected to a transport vehicle. The transport vehicle carries a radiation emission device inside and has a backscatter detector on the side facing the device under test.

Such security inspection equipment is completely carried by transportation vehicles, which is more convenient for transportation and flexible scheduling. For some large and difficult-to-move objects to be tested, they can be inspected by mobile transportation vehicles, thereby reducing the size of the security inspection equipment and expanding the use scenarios of the equipment.

In one embodiment, cantilever 8 includes a folding mechanism and a rotating mechanism for folding and rotating the cantilever. This structure allows the security inspection equipment to fold and rotate the cantilever to align with the vehicle's direction of travel during movement, facilitating transportation and secondary deployment. Furthermore, the cantilever's telescopic length can be adjusted based on the specific scenario, expanding the security inspection equipment's application scenarios. This type of security inspection equipment is suitable for deployment in important large, medium, and small security inspection sites, as well as temporary locations. It can continuously scan multiple objects over long distances, achieve high throughput, and detect quickly, allowing for flexible response to emergencies. It can also simultaneously detect a variety of contraband, including metal weapons, explosives, and drugs.

In one embodiment, the security inspection device may include a controller capable of controlling the rotation and folding of the boom. The controller may be located on the transport device and controls the rotation and folding of the boom via wired or wireless signals. Such security inspection equipment can utilize the controller to control the rotation and folding of the boom, making operation more convenient and user-friendly.

In one embodiment, the security inspection equipment also includes a processor capable of processing detection data from the forward scatter detector, backscatter detector, and transmission detector. The processor can generate a detection image based on the detection data and display it to personnel. The processor can also identify hazardous substances based on the detection results and issue corresponding labels or alerts. In one embodiment, the processor can be a computer. The processor can be installed in a vehicle and acquire detection data from the radiation detector via wired or wireless signals. Such security inspection equipment, equipped with a processor, can process detection data in real time, enabling faster detection of dangerous and prohibited items, thereby improving safety.

FIG6 is a flow chart of an embodiment of the ray detection method of the present invention.

In step 601, a ray emitter is used to emit a fan-shaped ray beam and a flying-spot ray beam toward an object to be measured.

In step 602, detection data is acquired by a radiation detector. The detection data includes forward scattering data, and also includes one or both of backscattering data and transmission data.

In step 603, detection information is acquired by analyzing the forward scattering data, the backscattering data, and the transmission data.

This approach, combining forward scatter data with backscatter data, reduces blind spots and optimizes detection of internal information on the opposite side of the radiation source. Acquiring forward scatter data and using it in conjunction with a transmission detector allows for simultaneous detection of both high- and low-density materials. The combined consideration of forward scatter, backscatter, and transmission data reduces blind spots and enables simultaneous detection of both high- and low-density materials. This approach optimizes detection of the object under test and improves detection accuracy.

In one embodiment, a ray emitter that alternately emits fan-shaped beams and flying-spot beams is used to emit radiation toward the object under test. This method allows a single ray emitter to emit both beams, reducing the size of the security inspection equipment. It also allows for simultaneous acquisition of transmission and scattering data, increasing detection speed and optimizing detection results.

In one embodiment, the detection image can be displayed based on the detection information. Prohibited objects can also be marked based on the detection information, or an alarm can be issued to alert personnel. During the detection process, personnel can remotely control and direct the detection image. This method enables real-time processing and timely display of detection results, facilitating personnel use and improving safety.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims (16)

1. A security inspection device, characterized in that it comprises: X-ray emitting device; X-ray detector; means of transport; cantilever; The radiation detector includes: A forward-scattering detector is located on the opposite side of the object under test relative to the ray emitting device; The radiation detector also includes: A transmission detector is located on the opposite side of the object to be tested relative to the ray emitting device. The transmission detector includes multiple detector modules. The incident surface of each detector module is located on the ray incident surface of the transmission detector. Depending on the position of each detector module in the transmission detector, the placement angle of each detector module is different and adapted to the ray incident direction. The transport vehicle is used to carry and move the radiation emitting device and the radiation detector; One end of the cantilever is connected to the transmission detector and the forward scattering detector, and the other end is connected to the transport vehicle. 2. The security inspection equipment according to claim 1, wherein the X-ray detector further includes a backscatter detector located between the X-ray emitting device and the object to be tested. 3. The security inspection equipment according to claim 1, wherein the radiation emitting device is used to emit a fan-shaped radiation beam and a flying spot radiation beam. 4. The security inspection equipment according to claim 2, wherein the radiation emitting device comprises: The radiation source is located at the center of the radiation emitting device; A spatial modulator, located between the X-ray source and the backscatter detector, includes a fixed shielding plate and a rotating shield located between the object under test and the fixed shielding plate. 5. The security inspection equipment according to claim 4, wherein the rotating shield includes one or more gaps and one or more through holes. 6. The security inspection equipment according to claim 1, wherein the placement angle of the detector module is adapted to the incident direction of the radiation, including: the detection surface of the detector module is perpendicular to the incident direction of the radiation. 7. The security inspection equipment according to claim 1, characterized in that, The transmission detector includes multiple detector units composed of predetermined detector modules arranged in parallel. The provision that the placement angle of each detector module is adapted to the incident direction of the ray, depending on the position of each detector module in the transmission detector, means that the detection surface direction of each detector unit is adapted to the incident direction of the ray, depending on the position of each detector unit in the transmission detector. 8. The security inspection equipment according to claim 1, wherein the transmission detector is a flat plate or an arc-shaped surface protruding to the opposite side of the object to be tested. 9. The security inspection equipment according to claim 2, wherein the radiation emitting device is carried inside the transport vehicle, and the backscatter detector is connected to the side of the transport vehicle. 10. The security inspection equipment according to claim 9, wherein the cantilever includes a folding mechanism and a rotating mechanism for folding and rotating the cantilever. 11. The security inspection equipment according to claim 2, characterized in that it further includes a processor for receiving detection signals from the forward scattering detector, the backscattering detector and the transmission detector, and analyzing the object to be tested. 12. The security inspection equipment according to claim 10, characterized in that it further includes a controller for controlling the folding and rotation of the cantilever. 13. A method for detecting radiation, characterized in that it comprises: A fan-shaped beam and a flying spot beam are emitted towards the object under test using a ray emitter located inside the vehicle. Data is acquired through a radiation detector, including: Forward scattering data of the object under test is acquired by a forward scattering detector located at one end of the cantilever relative to the transport vehicle. It also includes: acquiring transmission data of the object under test by means of a transmission detector located at one end of the cantilever relative to the transport vehicle. The transmission detector includes multiple detector modules. The incident surface of the detector module is located at the ray incident surface of the transmission detector. Depending on the position of each detector module on the transmission detector, the placement angle of each detector module is different and adapted to the ray incident direction. Detection information is obtained based on the forward scattering data and the transmission data. 14. The method according to claim 13, characterized in that it further comprises: Backscattering data of the object under test is acquired by a backscattering detector located on the side of the vehicle. 15. The method according to claim 13, characterized in that emitting a fan-shaped ray beam and a flying-spot ray beam towards the object to be tested using a ray emitter is as follows: A ray emitter that alternately emits fan-shaped and flying-point ray beams is used to emit rays toward the object under test. 16. The method according to claim 15, characterized in that it further comprises: Display the detection image based on the detection information; and/or Based on the detection information, mark the prohibited objects or alarms in the object to be tested.