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EP3602126A1 - Procédé et dispositif de balayage d'un angle solide - Google Patents

Procédé et dispositif de balayage d'un angle solide

Info

Publication number
EP3602126A1
EP3602126A1 EP18712568.7A EP18712568A EP3602126A1 EP 3602126 A1 EP3602126 A1 EP 3602126A1 EP 18712568 A EP18712568 A EP 18712568A EP 3602126 A1 EP3602126 A1 EP 3602126A1
Authority
EP
European Patent Office
Prior art keywords
electromagnetic beam
generated
beams
detector
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18712568.7A
Other languages
German (de)
English (en)
Inventor
Reiner Schnitzer
Tobias Hipp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3602126A1 publication Critical patent/EP3602126A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/484—Transmitters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/02—Details
    • G01C3/06—Use of electric means to obtain final indication
    • G01C3/08—Use of electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/4868—Controlling received signal intensity or exposure of sensor

Definitions

  • the invention relates to a method for scanning a scanning angle and a LI DAR device for scanning a scanning angle.
  • LI DAR Light Detection And Ranging
  • Measure laser pulses Over the time or time of flight of the beam can then be determined by knowing the speed of light, a distance between an object and the LI DAR device.
  • detectors for receiving reflected beams usually avalanche photodiodes or single photon avalanche diodes are used.
  • the necessary laser pulses within the eye safety guideline can be used depending on the system configuration
  • the shape of the received pulse can be falsified. Consequently, the determination of further measured variables on the basis of the pulse shape such as intensity, reflectivity, weather conditions, angle of the target object to the LIDAR device can be made difficult or prevented.
  • Disclosure of the invention The object underlying the invention can be seen to propose a LIDAR device and a method that can register objects in a near area without supersaturation of a detector despite high Reichweise.
  • a method of scanning a scan angle wherein at least one electromagnetic beam is generated and the at least one electromagnetic beam is deflected along the scan angle.
  • the at least one electromagnetic beam reflected at an object is received and detected, wherein after at least a first electromagnetic beam at least a second electromagnetic beam is generated and wherein the second
  • At least one first electromagnetic beam is generated and a short time later at least a second weaker electromagnetic beam.
  • Weaker in this context means that an intensity and an energy content of the at least one second electromagnetic beam are less than the intensity and the energy content of the at least one first electromagnetic beam.
  • the otherwise usual or possible 100% of energy of an electromagnetic beam is now divided between the at least one first beam and the at least one second beam.
  • the at least one first beam may, for example, have 80-90% of the energy to reach a maximum range of one LI DAR.
  • the at least one second beam can have 10-20% of the energy. This also allows objects using the
  • At least one second beam with higher linearity can be detected.
  • objects may be, for example, objects that are in a short time Distance to LIDAR device are positioned and / or have high reflectivity. These objects would cause saturation of the detector upon detection of the at least one first and high energy beam.
  • the energy of the at least one second electromagnetic beam is selected below a saturation of at least one detector. In this way, it can be prevented that the at least one second beam saturates the detector
  • the at least one second beam can still cause a
  • the at least one electromagnetic beam is generated pulsed.
  • a high intensity can be achieved with a constant energy content.
  • multiple pulsed beams can be generated within a short period of time.
  • the device is between the
  • Generating the at least one first electromagnetic beam and generating the at least one second electromagnetic beam initiates a delay time.
  • the at least one second beam can be generated delayed.
  • a plurality of second beams may be generated with a second delay time between the plurality of second beams. The second delay time can
  • an intensity ratio of the at least one first electromagnetic beam and the at least one second electromagnetic beam is varied. This allows the generated beams to be flexibly adapted to a situation and in situ. For example, in an automotive application in a high-traffic environment, a low intensity ratio may be used, so that a close range can be scanned more effectively. On the other hand, the highest possible intensity ratio of the two beams could be set on a motorway, so that a corresponding LIDAR device has the highest possible range and can therefore also be used at higher speeds.
  • Delay time between the at least one first electromagnetic beam and the at least one second electromagnetic beam varies.
  • the delay time can be adapted in particular to a distance of the object to the LIDAR device or at least one radiation source for generating at least one beam.
  • Delay time can be adjusted so that at least one reflected beam from the at least one detector within a defined period of time or within a defined measurement cycle can be detected.
  • the delay time can be chosen such that at least one received reflected beam can not overlap in time with a generated beam.
  • the delay time is chosen to be greater than a recovery time of a detector.
  • a reflected beam of the at least one first high-energy beam can cause saturation of the detector, the at least one detector requires a period of time to be ready to receive again for the at least one second beam.
  • a detector may be chosen that does not require a recovery time.
  • a LIDAR device for carrying out a method according to one aspect of the invention.
  • the LIDAR device has at least one radiation source for generating at least one electromagnetic beam, a deflection unit for deflecting the at least one generated electromagnetic beam along a Scanning angle and at least one detector for receiving and detecting at least one reflected on an object electromagnetic beam, wherein the at least one radiation source at least a first
  • a working range of the LIDAR device By generating at least one second weaker beam shortly after the at least one high-energy first beam, a working range of the LIDAR device can be expanded.
  • An energetic beam reflected from an object may cause saturation of the at least one detector for an object that is a short distance away from the LIDAR device.
  • Reflectivity can also exceed the dynamic range of the detector. If the detector experiences saturation, further evaluation of the at least one received beam can be hindered or prevented. In particular, an evaluation of further measured variables based on a pulse shape of the beam, such as intensity,
  • a variable delay time is implemented between the at least one first generated beam and the at least one second generated beam. Depending on the detector must have a
  • Recovery time after saturation are taken into account. Thus, it can be ensured by the delay time that the at least one second beam can be regularly detected by the detector. This can be negative
  • an intensity ratio between the at least one first electromagnetic beam and the at least one second electromagnetic beam is variable.
  • the intensity ratio may be, for example, 90% to 10%, 80% to 20%, 50% to 50% and the like. Especially in applications that require a long range, the largest possible percentage of energy can be expended on the at least one first beam. Furthermore, in addition to the selection of the delay time, the intensity ratio may vary depending on one
  • Detecting close range such as below 50m can be selected. After each measuring cycle, at least two by the
  • Delay time separated generated and received again beams can be changed, the delay time and / or the intensity ratio.
  • FIG. 1 is a schematic representation of a LIDAR device according to a first embodiment
  • FIG. 2a shows a schematic sequence of generated beams according to a method according to a first exemplary embodiment
  • 2b shows a schematic intensity spectrum of detected rays after a
  • FIG. 3a, 3b show a schematic sequence of generated and received beams according to a method according to the first embodiment
  • Fig. 4a shows a schematic sequence of generated beams according to a method according to a second embodiment
  • 4b, 4c show a schematic sequence of generated and received beams according to a method according to the second embodiment.
  • the same constructive elements each have the same reference numerals.
  • FIG. 1 shows a first exemplary embodiment of a LIDAR device 1.
  • the LIDAR device 1 has a radiation source 2 for generating at least one electromagnetic beam 4.
  • the radiation source 2 according to the exemplary embodiment is a laser 2 which generates beams 4 in a pulse shape.
  • the laser 2 is for generating a beam 4 having a wavelength in the non-visible infrared range.
  • the wavelength can be greater than 800 nm, for example.
  • the beam 4 generated by the laser 2 is deflected by a deflection unit 6 or a rotatable mirror 6.
  • the mirror 6 is in this case pivotable along a rotation axis R.
  • the mirror 6 can deflect the generated beam 4 along a defined scanning angle H.
  • the mirror 6 is orthogonal to the horizontal scanning angle H pivotally and thus covers a vertical scanning angle V from.
  • the at least one generated beam 4 is at least partially reflected by the object 8, 9 and becomes the reflected or incoming beam 10, 30.
  • the reflected beam 10, 30 is received by a receiving optical system 12 and directed to a detector 14.
  • the detector 14 consists of a plurality of detector cells 16, which are single photon avalanche diodes according to the embodiment.
  • FIG. 2 a shows a schematic sequence of generated beams 4, 5 according to a method according to a first exemplary embodiment.
  • an intensity I of a first generated beam 4 and a second generated beam 5 is illustrated against a time t.
  • the generated beams 4, 5 are pulse-shaped and form a measuring cycle 18.
  • the generated beams 4, 5 by a delay time 20 from each other in time.
  • a second interruption time 22 which belongs to the first measuring cycle 18.
  • a decay phase of the radiation source 2 can be realized.
  • FIG. 2b shows a schematic intensity spectrum of detected beams 10, 11 according to the method according to the first exemplary embodiment.
  • the time recorded by a detector cell 16 is
  • the time segment shown corresponds to a first time range from the measurement cycle 18.
  • the first detected beam 10 has such a high intensity I that the detector cell 16 reaches a saturation state 24 and is, as it were, overexposed.
  • the second beam 11 is detected.
  • the second beam 1 1 was generated with a lower energy content and has after
  • Saturation state 24 of the detector cell 16 is located.
  • FIGS. 3a and 3b show schematic time sequences of reflected or detected beams 10, 11, 30, 31 recorded by at least one detector cell 16 of the detector 14 within a time frame t.
  • the measurement cycle 18 already described in FIG. 2a was used to detect two objects 8, 9.
  • the beams 10, 11 reflected by a first object 8 and the beams 30, 31 reflected by a second object 9 have been recorded here within the same temporal intensity profile I.
  • no separate time string is necessary for the evaluation of the detected beams 10, 11, 30, 31. So an evaluation process can be accelerated.
  • FIG. 3b shows, for example, that the detected beams 10, 11, 30, 31 of two different objects 8, 9 can overlap. In particular, this is the case when a distance between the two objects 8, 9 is present, the flight duration of the generated beams 4, 5 correspond to the
  • FIG. 4 a shows a schematic sequence of generated beams 4, 5 according to the method according to a second exemplary embodiment.
  • the radiation source 2 generates according to the embodiment a first high-energy beam 4 in the form of a pulse and two further second energy-weaker beams 5. Between the first generated beam 4 and the two second generated
  • Delay time can also be carried out variably depending on the measurement cycle 18 and adapted to a type or distance of the object 8, 9 or to a number of expected objects 8, 9.
  • Delay time 22 or interruption time 22 no further beams 4, 5 generated. Rather, the interruption time 22 as the decay of the
  • Radiation source 2 can be used.
  • the delay time 20 and the interruption time 22 can be adapted to a defined measurement cycle 18.
  • the energy content emitted by the generated beams 4, 5 per unit time t can also be adjusted.
  • the first generated beam 70% of the energy content in the measurement cycle 18 and the two second generated beams 5 each 15% of the energy content.
  • FIG. 4b shows the measuring cycle 18 described in FIG. 4a with the signals received from at least one detector cell 16 of the detector 14 or
  • FIG. 4c shows, for example, beams 10, 11, 30, 31 of two objects 8, 9 which are at a distance from one another and which are separated by beams 10, 11, 30, 31 within a time of flight of the order of magnitude of FIG Delay 20 can be covered.
  • the detected beams 10, 11, 30, 31 of both objects 8, 9 have overlays or overlaps in certain areas.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne un procédé de balayage d'un angle de balayage, selon lequel au moins un faisceau électromagnétique est produit, le ou les faisceaux électromagnétiques sont déviés le long de l'angle de balayage et le ou les faisceaux électromagnétiques réfléchis sur un objet sont reçus et détectés, au moins un deuxième faisceau électromagnétique étant produit après au moins un premier faisceau électromagnétique et le deuxième faisceau électromagnétique étant produit avec une énergie inférieure à celle du premier faisceau électromagnétique. L'invention concerne par ailleurs un dispositif LIDAR.
EP18712568.7A 2017-03-20 2018-03-19 Procédé et dispositif de balayage d'un angle solide Withdrawn EP3602126A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017204587.6A DE102017204587A1 (de) 2017-03-20 2017-03-20 Verfahren und Vorrichtung zum Abtasten eines Raumwinkels
PCT/EP2018/056845 WO2018172260A1 (fr) 2017-03-20 2018-03-19 Procédé et dispositif de balayage d'un angle solide

Publications (1)

Publication Number Publication Date
EP3602126A1 true EP3602126A1 (fr) 2020-02-05

Family

ID=61750118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18712568.7A Withdrawn EP3602126A1 (fr) 2017-03-20 2018-03-19 Procédé et dispositif de balayage d'un angle solide

Country Status (5)

Country Link
US (1) US11703574B2 (fr)
EP (1) EP3602126A1 (fr)
CN (1) CN110462440B (fr)
DE (1) DE102017204587A1 (fr)
WO (1) WO2018172260A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018205376A1 (de) * 2018-04-10 2019-10-10 Ibeo Automotive Systems GmbH Verfahren zum Durchführen eines Messvorgangs
US20230251379A1 (en) * 2021-03-23 2023-08-10 Raytheon Company Combined high-energy laser (hel) system or other system and laser detection and ranging (ladar) system
DE102022206215A1 (de) 2022-06-22 2023-12-28 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betrieb eines LiDAR-Systems

Citations (3)

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EP2395368B1 (fr) * 2010-06-11 2012-02-08 Sick AG Scanner laser mesurant l'éloignement destiné à la détection d'objets dans une zone de surveillance
EP2469296B1 (fr) * 2010-12-21 2012-10-24 Sick AG Capteur optoélectronique et procédé destiné à la détection et la détermination de l'éloignement d'objets
EP2184616B1 (fr) * 2008-11-05 2016-03-30 Robert Bosch GmbH Procédé et dispositif destinés à la commande d'une source de rayonnement

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JP4338536B2 (ja) * 2004-01-23 2009-10-07 住友重機械工業株式会社 レーザ加工装置及びレーザ加工方法
US20090273770A1 (en) * 2008-04-30 2009-11-05 Honeywell International Inc. Systems and methods for safe laser imaging, detection and ranging (lidar) operation
US9528819B2 (en) 2011-10-14 2016-12-27 Iee International Electronics & Engineering S.A. Spatially selective detection using a dynamic mask in an image plane
US9383753B1 (en) * 2012-09-26 2016-07-05 Google Inc. Wide-view LIDAR with areas of special attention
CN103576162A (zh) * 2013-10-25 2014-02-12 中国科学院半导体研究所 激光雷达装置及利用该装置测量目标物距离的方法
CN105182361A (zh) 2015-08-06 2015-12-23 哈尔滨工业大学 一种基于复合调制脉冲编码的4d成像光子计数激光雷达
DE102016010985A1 (de) * 2016-09-10 2018-03-15 Blickfeld GmbH Laser-scanner zur abstandsmessung bei kraftfahrzeugen

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP2184616B1 (fr) * 2008-11-05 2016-03-30 Robert Bosch GmbH Procédé et dispositif destinés à la commande d'une source de rayonnement
EP2395368B1 (fr) * 2010-06-11 2012-02-08 Sick AG Scanner laser mesurant l'éloignement destiné à la détection d'objets dans une zone de surveillance
EP2469296B1 (fr) * 2010-12-21 2012-10-24 Sick AG Capteur optoélectronique et procédé destiné à la détection et la détermination de l'éloignement d'objets

Non-Patent Citations (1)

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Title
See also references of WO2018172260A1 *

Also Published As

Publication number Publication date
US11703574B2 (en) 2023-07-18
CN110462440B (zh) 2024-04-30
US20200018859A1 (en) 2020-01-16
WO2018172260A1 (fr) 2018-09-27
DE102017204587A1 (de) 2018-09-20
CN110462440A (zh) 2019-11-15

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