CN111965623B - Detector detection method and system - Google Patents
Detector detection method and system Download PDFInfo
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- CN111965623B CN111965623B CN202010624851.9A CN202010624851A CN111965623B CN 111965623 B CN111965623 B CN 111965623B CN 202010624851 A CN202010624851 A CN 202010624851A CN 111965623 B CN111965623 B CN 111965623B
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- 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
- G01S7/497—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application relates to a detector detection method and a detector detection system. The detector detection method comprises the step of transmitting a preset emergent light signal to a preset target after a detector to be detected is fixed. The detector to be tested receives a reflected light signal of the preset emergent light signal reflected by the preset target and converts the reflected light signal into a reflected electric signal. And finally, grouping the detectors to be detected according to the amplitude of the reflected electric signals. According to the detector detection method, the detectors to be detected are fixed, the same preset emergent light signals and the same preset targets are selected, so that the situation that only the detectors to be detected have different performances in the grouping process of the detectors can be guaranteed, and the performance of the detectors to be detected can be screened. The detector detection method can distinguish the detectors in the incoming material link before laser radar production, screens out the detectors to be detected with similar performance and installs the detectors, so that the difference among laser radar channels can be avoided, the performance of the laser radar is ensured, and the yield of the laser radar in the production stage is improved.
Description
Technical Field
The present application relates to the field of detector detection technologies, and in particular, to a detector detection method and system.
Background
The laser radar mainly comprises a transmitting system, a receiving system and a signal processing system. To adapt to low-cost product targets, a more technically sophisticated laser is typically selected as the light source of the lidar, such as a semiconductor laser. However, the limitation of the energy consumption of semiconductor laser light sources puts higher demands on the sensitivity of the lidar detectors.
In a laser radar, a detector needs to detect an extremely weak reflected light signal, belongs to the field of low-light detection, and has high requirements on the consistency of the performance of the detector. However, under practical production conditions, the performance of the same lot of detectors is inevitably different. The difference of the detectors directly causes that when the laser radar detects the same object, the receiving channels of different detectors have difference, and the system-level error greatly restricts the yield of the laser radar.
Disclosure of Invention
Based on this, it is necessary to provide a method and a system for detecting a probe, aiming at the problem of the diversity of the probe.
The application provides a detector detection method, which comprises the following steps:
fixing a detector to be detected;
transmitting a preset emergent light signal to a preset target;
the detector to be detected receives a reflected light signal of the preset emergent light signal reflected by the preset target and converts the reflected light signal into a reflected electric signal;
and grouping the detectors to be detected according to the amplitude of the reflected electric signals.
In one embodiment, before the transmitting the predetermined outgoing optical signal to the predetermined target, the method further includes:
judging whether the parameter of the preset emergent light signal is within a preset parameter range or not;
and if the parameter is not in the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal.
In one embodiment, the parameter is transmit power and/or divergence angle.
In one embodiment, when the parameter is the transmission power, if the parameter is not within the preset parameter range, dynamically adjusting the parameter of the preset outgoing optical signal includes:
obtaining the emission power of the emergent light signal according to a feedback signal;
judging whether the transmitting power exceeds a preset transmitting power range or not;
if the transmitting power is larger than the maximum value of the preset transmitting power range, controlling the transmitting drive to reduce the drive signal;
and if the transmitting power is smaller than the minimum value of the preset transmitting power range, controlling the transmitting drive to increase the driving signal.
In one embodiment, when the parameter is the transmission power, after dynamically adjusting the parameter of the predetermined outgoing optical signal if the parameter is not within the predetermined parameter range, the method further includes:
judging whether the dynamically adjusted transmitting power is within a preset transmitting power range or not;
if the transmitting power is not within the preset transmitting power range, judging whether the driving signal is larger than an alarm threshold value or not;
and if the driving signal is greater than the alarm threshold value, generating and outputting a replacement alarm signal.
In one embodiment, when the parameter is the divergence angle, if the parameter is not within the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal includes:
obtaining the divergence angle of the emergent light signal according to the size of a light spot;
judging whether the divergence angle exceeds a preset divergence angle range or not;
if the divergence angle is larger than the maximum value of the preset emission angle range, adjusting the emission mirror group to reduce the divergence angle;
and if the divergence angle is smaller than the minimum value of the preset divergence angle range, adjusting the emission mirror group to increase the divergence angle.
In one embodiment, the grouping the probes to be tested according to the amplitudes of the reflected electrical signals includes:
sequencing the detectors to be tested according to the amplitude of the corresponding reflected electric signals;
and grouping the sequenced detectors to be tested according to a preset proportion.
In one embodiment, the grouping the probes to be tested according to the amplitudes of the reflected electrical signals includes:
dividing the corresponding detector to be detected with the amplitude of the reflected electric signal smaller than a first preset amplitude into a first group;
and dividing the corresponding detector to be detected with the amplitude value of the reflected electric signal greater than or equal to the first preset amplitude value into a second group.
In one embodiment, before the to-be-tested detector receives the reflected light signal of the preset emergent light signal reflected by the preset target, the method further includes:
and controlling the receiving drive to load a preset bias voltage on the detector to be tested.
Based on the same inventive concept, the present application further provides a detector detection system, comprising:
the emitting module comprises a laser and an emitting driver, and is used for generating a preset emitting light signal and emitting the preset emitting light signal to a preset target;
the receiving module comprises a detector to be detected and a receiving driver, and is used for receiving a reflected light signal of the preset emergent light signal reflected by the preset target and converting the reflected light signal into a reflected electric signal; and
and the data processing module is electrically connected with the detector to be detected and used for receiving the reflected electrical signals, determining the amplitude of the reflected electrical signals and grouping the detector to be detected according to the amplitude of the reflected electrical signals.
According to the detector detection method, the preset emergent light signal can be emitted to the preset target after the detector to be detected is fixed. The detector to be tested receives a reflected light signal of the preset emergent light signal reflected by the preset target and converts the reflected light signal into a reflected electric signal. And grouping the detectors to be detected according to the amplitude of the reflected electric signals. The detector detection method can ensure that the positions of the detectors to be detected in the grouping process of the detectors to be detected are the same by fixing the detectors to be detected. Meanwhile, the same preset emergent light signals and the same preset targets are selected, so that the situation that only the to-be-detected detectors are different in performance in the grouping process of the detectors can be guaranteed, and the to-be-detected detectors are screened according to the performance difference. Therefore, through the detector detection method, the detectors can be distinguished in the incoming material link before laser radar production, the detectors to be detected with performance (detection capacity) close to each other are screened out and installed, the difference between receiving channels of the laser radar can be avoided, the performance of the laser radar is guaranteed, and the yield of the laser radar in the production stage is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a detector according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a detector detection system according to an embodiment of the present disclosure.
Description of the reference numerals
100. Detector detection system
10. Outgoing module
110. Laser device
120. Emission lens group
20. Receiving module
210. Detector to be tested
220. Receiving lens group
30. Data processing module
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and those skilled in the art will recognize that many modifications may be made without departing from the spirit and scope of the present application and that the present application is not limited to the specific implementations disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides a method for detecting a detector. The detector detection method comprises the following steps:
step S10, fixing a detector 210 to be detected;
step S20, transmitting a preset emergent light signal to a preset target;
step S30, the detector to be detected 210 receives a reflected light signal of a preset emergent light signal reflected by a preset target and converts the reflected light signal into a reflected electric signal;
step S40, grouping the detectors 210 to be tested according to the amplitudes of the reflected electrical signals.
In this embodiment, after the detector 210 to be tested is fixed, a predetermined emergent light signal can be transmitted to the predetermined target. The detector 210 to be measured receives the reflected light signal of the predetermined emergent light signal reflected by the predetermined target, and converts the reflected light signal into a reflected electrical signal. The probes 210 to be tested are grouped according to the amplitude of the reflected electrical signal. The above-mentioned detector detection method can ensure that the positions of the detectors 210 to be detected are the same in the grouping process of the detectors 210 to be detected by fixing the detectors 210 to be detected. Meanwhile, the same preset emergent light signal and the same preset target are selected, so that the amplitude of the reflected electrical signal of different detectors to be detected is only related to the performance of the detectors to be detected, and the influence of the emergent light signal, the target, the receiving angle and other factors on the amplitude of the reflection point signal is eliminated; the performance of only the to-be-tested detectors 210 in the detector grouping process can be guaranteed to be different, so that the to-be-tested detectors 210 are screened according to the performance. Therefore, through the detector detection method, the detectors can be distinguished in the incoming material link before laser radar production, the detectors 210 to be detected with performance (detection capacity) close to each other are screened out and installed, the difference among laser radar channels can be avoided, the performance of the laser radar is guaranteed, and the yield of the laser radar in the production stage is improved.
In one embodiment, the probe detection system 100 may be used to perform a probe detection method. The detector detection system 100 may include an exit module 10, a receiving module 20, and a data processing module 30. The emitting module 10 may include a laser 110 and a transmitting driver, and the receiving module 20 may include a detector under test 210 and a receiving driver.
In step S10, the multiple detectors 210 to be tested may be sequentially fixed at the same preset position, that is, the position of each detector 210 to be tested is the same in the grouping process of the detectors 210 to be tested, so as to ensure that only the performance of the detectors 210 to be tested is taken as a variable during grouping according to the performance, and ensure the accuracy of the grouping result of the detectors to be tested.
In step S20, the laser 110 in the emitting module 10 may generate a predetermined emitting light signal with fixed parameters such as emitting power and divergence angle under the control of the driving signal output by the emitting driver, and emit the predetermined emitting light signal to the predetermined target. In this embodiment, when the detectors 210 to be detected are detected respectively, the positions of the exit module 10 and the preset target need to be fixed or relatively fixed. In one embodiment, the emitting module 10, the receiving module 20 and the predetermined target may be disposed at fixed positions in the mounting board to ensure that the relative positions of the emitting module 10, the receiving module 20 and the predetermined target are fixed. Wherein, the detector 210 to be tested can be detachably connected with the mounting plate. It can be understood that, in the process of grouping the detectors 210 to be detected, since the emission positions and the emission parameters of the preset emergent light signals are the same, and the positions of the preset targets and the surface characteristics of the targets are the same, the performance of the detectors 210 to be detected can be guaranteed to be a single variable, and therefore the accuracy of the grouping results of the detectors 210 to be detected is guaranteed. Therefore, the detector detection method can ensure that other environment variables are the same, and grouping of the detectors 210 to be detected is realized by changing the detectors 210 to be detected, so that the accuracy of the grouping result of the detectors 210 to be detected is ensured.
In one embodiment, the exit module 10 may include, but is not limited to, a carbon dioxide laser, nd: YAG laser, helium-neon laser, er: YAG laser, gaAlAs semiconductor laser, and Ho: any one of the lasers, such as YAG laser, may be selected according to the type of the laser 110 in the laser radar to which the detector 210 to be measured is applied, and is not particularly limited herein. In one embodiment, the exit module 10 may further include an emission mirror group 120, and the emission mirror group 120 may adjust a divergence angle of the predetermined exit light signal, so as to ensure a transmission direction and a transmission distance of the predetermined exit light signal, so that the predetermined exit light signal is transmitted to a fixed position of the predetermined target.
In one embodiment, the predetermined emergent light signal and the predetermined target can be set according to the actual application environment of the detector 210 to be detected, for example, the predetermined emergent light signal with appropriate parameters, the target with appropriate distance, and the predetermined target with appropriate reflectivity can be selected according to the detection capability and the detection range of the detector 210 to be detected. In one embodiment, the predetermined targets may be electronic targets, which can display different predetermined targets according to the requirements of different batches of the probes 210 to be tested, so as to expand the application range of the probe detection method.
In step S30, the detector 210 receives a reflected light signal of the predetermined emergent light signal reflected by the predetermined target, and converts the reflected light signal into a reflected electrical signal. It is understood that the receiving module 20 may include a detector under test 210 and a receiving driver, and the detector under test 210 may receive the reflected optical signal and convert the reflected optical signal into a reflected electrical signal under the control of the driving signal emitted by the receiving driver. It should be noted that, since the probe detection method needs to group a plurality of probes 210 to be tested of the same model, the probes 210 to be tested in the receiving module 20 can be replaced. In one embodiment, the receiving module 20 may include a detector card holder, and the detector 210 to be detected may be directly fixed in the detector card holder, so as to ensure that when different detectors 210 to be detected are replaced, the position of the detector 210 to be detected does not deviate, thereby ensuring that no human factor is introduced into the grouping process of the detector 210 to be detected, and improving the accuracy of the grouping result obtained by the detector detection method; meanwhile, after the detector 210 to be detected is installed in the detector card seat, the receiving driving and data processing module 30 can also be connected with the detector 210 to be detected through the detector card seat, so that the process of replacing the detector 210 to be detected every time is simplified.
In step S40, the probes 210 to be tested may be grouped according to the amplitudes of the reflected electrical signals. It is understood that the data processing module 30 in the detector detecting system 100 may be electrically connected to the detector 210 to be detected, receive the reflected electrical signal output by the detector 210 to be detected, determine the amplitude of the reflected electrical signal, and group the detector 210 to be detected according to the amplitude of the reflected electrical signal. The data processing module 30 may be preloaded with preset group division rules, and may perform data processing on the amplitudes of the reflected light signals received by different detectors 210 to be detected, so as to complete grouping of the detectors 210 to be detected.
In one embodiment, the data processing module 30 may be a computer, or other processor or chip with data processing capability, which is not specifically limited in this application. In one embodiment, the detector card seat may be connected to the data processing module 30 through a data line, and the detector 210 to be tested may be electrically connected to the data processing module 30 only through the detector card seat, so as to further ensure the accuracy of the detector detection method in grouping the detector 210 to be tested, and simplify the dismounting process of replacing the detector 210 to be tested.
In one embodiment, before transmitting the predetermined outgoing optical signal to the predetermined target, the method further includes: and judging whether the parameter of the preset emergent light signal is within a preset parameter range. And if the parameter is not in the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal. In one embodiment, the parameter is transmit power and/or divergence angle.
In one embodiment, during the process of detecting the detector to be detected, the parameter of the preset emergent light signal may change due to factors such as device aging or environmental changes. Therefore, in order to ensure the accuracy of the detection and grouping results of the multiple detectors to be detected, the preset emergent light signals emitted each time need to be the same. In this embodiment, a control module in the detector detection system 100 may be used to obtain a parameter of a preset emergent light signal during a detector detection process, and determine the size of the parameter of the emergent light signal. When the parameter is not within the preset parameter range, the control module may generate a parameter adjustment control instruction and send the parameter adjustment control instruction to the emitting module 10, so as to adjust the parameter of the preset emitting light signal, thereby ensuring the accuracy of the detector detection method in grouping the detectors to be detected. For example, the receiving module 20 is configured as a detection detector for receiving the reflected light signal, converts the reflected light signal into a detection electrical signal, and sends the detection electrical signal as a feedback signal to the emitting module 10; after the amplitude of the detected electrical signal is compared with a preset amplitude, the emission driver drives the laser 110 according to the comparison result.
In one embodiment, when the parameter is the transmission power, if the parameter is not within the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal includes: and obtaining the emission power of the emergent light signal according to the feedback signal. And judging whether the transmitting power exceeds a preset transmitting power range. And if the transmitting power is larger than the maximum value of the preset transmitting power range, controlling the transmitting drive to reduce the driving signal. And if the transmitting power is smaller than the minimum value of the preset transmitting power range, controlling the transmitting drive to increase the driving signal.
In one embodiment, when the parameter of the emergent light signal is preset as the emission power, the control module in the detector detecting system 100 may obtain the emission power of the emergent light signal according to the feedback signal, and generate a power adjustment control command according to the emission power, so as to control the emission drive in the emergent module 10 to decrease or increase the drive signal. It can be understood that the steps can ensure that the emission power of the preset emergent light signals is the same, so that the accuracy of the grouping result of the detector to be detected is ensured.
In one embodiment, when the parameter is the transmission power, if the parameter is not within the preset parameter range, after dynamically adjusting the parameter of the preset outgoing optical signal, the method further includes: and judging whether the dynamically adjusted transmitting power is within a preset transmitting power range. And if the transmitting power is not within the preset transmitting power range, judging whether the driving signal is larger than an alarm threshold value. And if the driving signal is greater than the alarm threshold value, generating and outputting a replacement alarm signal.
In one embodiment, the control module of the detector detection system 100 may dynamically adjust the transmission power to further determine whether the transmission power is within the predetermined transmission power range. If the transmitting power is not within the transmitting power range, whether the driving signal is larger than the alarm threshold value needs to be further judged, namely whether the consistency of the preset emergent light signal can be ensured by continuously adjusting the parameters at present needs to be judged. If the driving signal is greater than the alarm threshold, it indicates that the consistency of the preset emergent light signal cannot be ensured only by adjusting the parameters, and at this time, the relevant devices in the emergent module 10 in the detector detection system 100 need to be replaced. Therefore, if the driving signal is greater than the alarm threshold, a replacement alarm signal needs to be generated and output to remind a worker to replace a device, so that the accuracy of the grouping result of the detector to be detected is ensured.
In one embodiment, when the parameter is the divergence angle, if the parameter is not within the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal includes: and obtaining the divergence angle of the emergent light signal according to the spot size. And judging whether the divergence angle exceeds a preset divergence angle range or not. If the divergence angle is greater than the maximum value of the preset emission angle range, the emission mirror group 120 is adjusted to reduce the divergence angle. If the divergence angle is less than the minimum value of the predetermined divergence angle range, the emission mirror group 120 is adjusted to increase the divergence angle.
In one embodiment, when the parameter of the preset outgoing light signal is a divergence angle, the control module in the detector detecting system 100 may obtain the divergence angle of the outgoing light signal according to the size of the light spot, and generate a divergence angle adjustment control command according to the size of the divergence angle, so as to control the emission mirror group 120 in the outgoing module 10 to decrease or increase the emission angle. Since the distance between the preset target and the laser 110 is kept constant, if the size of the light spot on the preset target is larger, it means that the divergence angle of the preset emergent light signal is larger; conversely, the smaller the divergence angle. The divergence angle of the preset outgoing light signal emitted by the outgoing module can be changed by adjusting the distance between the emitting mirror group 120 and the laser 110; in this embodiment, the position of the set of emission mirrors 120 is adjusted along the optical axis direction to change the distance between the set of emission mirrors 120 and the laser 110, thereby achieving adjustment of the divergence angle. It can be understood that the emitting angle of the preset emergent light signal can be ensured by the steps, so that the accuracy of the grouping result of the detector to be detected is ensured.
In one embodiment, grouping the probes to be tested according to the amplitudes of the reflected electrical signals includes: and sequencing the detectors to be tested according to the amplitude of the corresponding reflected electric signals. And grouping the sequenced detectors to be tested according to a preset proportion. In this embodiment, the sequencing rule and the preset ratio of the reflected electrical signals are the preset group division rule loaded in the data processing module 30, and the data processing module 30 may group the to-be-detected detectors 210 according to the amplitudes of the reflected electrical signals and the preset group division rule.
It is to be understood that the present application is not limited to the number of groups of probes under test. In one embodiment, the detectors under test can be divided into three groups. In this embodiment, the data processing module 30 may perform sorting processing on all the detectors 210 to be tested according to the amplitude of the reflected electrical signal corresponding to each detector 210 to be tested. For example, the detectors 210 to be tested corresponding to the amplitudes of the first a% of the reflected electrical signals may be divided into a first group, the detectors 210 to be tested corresponding to the amplitudes of the middle B% of the reflected electrical signals may be divided into a second group, and the detectors 210 to be tested corresponding to the amplitudes of the last C% of the reflected electrical signals may be divided into a third group, where the sum of a%, B%, and C% is 1. The A%, the B% and the C% can be set according to actual parameters required in the laser radar production process, so that the detectors with similar performance are divided into a group, and the screening of the detector 210 to be detected with a signal amplitude value close to that of the detector can be realized; in the assembling process, the detectors in the same group are arranged in the same laser radar, so that the consistency of the laser radar at a signal receiving end is ensured.
In one embodiment, the amplitude of the reflected electrical signal can be defined as belonging to the first 30% (a%), the middle 40% (B%), and the last 30% (C%) of the overall amplitude as the decision for discrimination. In the above determination manner, the fluctuation range of the signal amplitude can be controlled within 20%. In the present embodiment, the division of the three groups, i.e., the first group, the second group, and the third group, does not limit the present application. In practical application, more than three groups of detectors 210 to be detected can be grouped more finely according to the requirements of the laser radar production process, so as to obtain a combination of the detectors 210 to be detected with more stable signal amplitude fluctuation.
In one embodiment, grouping the probes to be tested according to the amplitudes of the reflected electrical signals includes: and dividing the corresponding detectors to be detected with the amplitude of the reflected electric signals smaller than a first preset amplitude into a first group. And dividing the corresponding detectors to be detected with the amplitude of the reflected electrical signals larger than or equal to a first preset amplitude into a second group. By setting the preset amplitude value, part of detectors with unqualified performance can be screened out. In this embodiment, the setting of the first preset amplitude and the grouping method are the preset group division rules loaded in the data processing module 30, and the data processing module 30 may group the detector 210 to be detected according to the amplitude of the reflected electrical signal and the preset group division rules. In one embodiment, the detector to be detected may also be divided into multiple groups by setting multiple preset amplitudes. For example, by setting a first preset amplitude and a second preset amplitude, the detectors to be tested can be divided into a first group, a second group and a third group. Through setting up a plurality of predetermined amplitude, divide into the detector that awaits measuring the multiunit, be convenient for screen the detector of the partial performance two poles of the earth, be convenient for simultaneously carry out the packet screening to large batch detector.
In one embodiment, before the detector to be tested receives the reflected light signal of the predetermined outgoing light signal reflected by the predetermined target, the method further includes: and controlling the receiving drive to load a preset bias voltage on the detector to be detected. It should be noted that, since the response of the detector 210 to be tested to the reflected light signal is affected by the bias voltage loaded by the circuit, the consistency of the bias voltage loaded by the detector 210 to be tested needs to be ensured to ensure the accuracy of the grouping result of the detector to be tested.
Referring to fig. 2, based on the same inventive concept, the present application further provides a detector detection system 100. The detector detection system 100 includes an exit module 10, a receiving module 20, and a data processing module 30. The exit module 10 includes a laser 110 and an emission drive. The emitting module 10 is configured to generate a predetermined emitting light signal and emit the predetermined emitting light signal to a predetermined target. The receiving module 20 includes a probe to be tested and a receiving driver. The receiving module 20 is configured to receive a reflected light signal of the predetermined emergent light signal reflected by the predetermined target, and convert the reflected light signal into a reflected electrical signal. The data processing module 30 is electrically connected to the to-be-tested detector 210, and is configured to receive the reflected electrical signals, determine amplitudes of the reflected electrical signals, and group the to-be-tested detectors according to the amplitudes of the reflected electrical signals.
It should be noted that the exit module 10, the receiving module 20, and the data processing module 30 in this embodiment may be the exit module 10, the receiving module 20, and the data processing module 30 in any embodiment described above, and are not described herein again.
In this embodiment, the laser 110 in the emitting module 10 may generate a preset emitting light signal and emit the preset emitting light signal to the preset target under the control of the driving signal emitted by the emission driver, so as to ensure that the preset emitting light signal and the preset target are the same in the grouping process of the detectors to be detected. The detector 210 to be tested in the receiving module 20 can receive the reflected light signal formed after being reflected by the preset target under the control of receiving the driving signal emitted by the driving, and convert the reflected light signal into a reflected electrical signal. The data processing module 30 receives the reflected electrical signal and determines the amplitude of the reflected electrical signal. Due to the single variable principle, the data processing module 30 can group the probes 210 to be tested according to the amplitudes of the reflected electrical signals. The detector detection system 100 can distinguish the receiving sensors in the incoming material link before laser radar production, and the detectors 210 to be detected with the performance (detection capability) close to each other are screened out to be installed, so that the difference among laser radar channels can be avoided, the performance of the laser radar is ensured, and the yield of the laser radar in the production stage is improved.
In one embodiment, the receiving module 20 further comprises a receiving lens group 220. The detector 210 to be tested is located at a focal position of the receiving lens group 220, and the receiving lens group 220 is configured to collect the reflected light signal and focus the reflected light signal on the detector 210 to be tested. In this embodiment, the receiving lens group 220 can be a telescope system, and the receiving lens group 220 can focus the collected reflected light spot on the detector 210 to be detected. It can be understood that, in the process of grouping a plurality of detectors to be tested 210 of the same model, the relative positions between the receiving mirror group 220 and the exit module 10 and the detectors to be tested 210 are fixed to satisfy the single variable principle.
In one embodiment, the center of the detector under test 210 is collinear with the main optical axis of the receiving mirror group 220. In addition, since the detector 210 to be detected is located at the focal position of the receiving lens group 220, the receiving lens group 220 can focus all reflected light signals entering the field of view of the detector 210 to be detected, so as to ensure that the receiving lens group 220 accurately focuses the collected reflected light spots on the detector 210 to be detected, and further improve the intensity of the light signals received by the detector 210 to be detected, thereby obtaining the performance difference of different detectors 210 to be detected under the same working state.
In one embodiment, the emission lens group 120 may include any one of a single lens, a double cemented lens, and an aspherical lens combination. The receiving lens group 220 may include any one of a single lens, a double cemented lens and an aspheric lens combination, that is, the receiving lens group 220 is an optical device capable of changing the direction of light beams. It should be noted that, the present embodiment does not limit the specific types and parameters of the set of emission mirrors 110 and the set of receiving mirrors 220, and the set of emission mirrors 110 and the set of receiving mirrors 220 can be selected according to the reflected light reflected by the predetermined target and the size of the detector 210 to be detected. In one embodiment, the transmitting lens group 110 and the receiving lens group 220 may respectively include one or more single lenses, and the single lenses may be disposed in a long lens barrel so as to be fixed to the bracket, thereby ensuring that the relative positions between the transmitting lens group 110 and the receiving lens group 220, and the exit module 10 and the detector 210 to be tested are fixed.
It is understood that the field angle of the receiving lens group 220 should not be too large, otherwise the convenience of replacing the dut 210 will be reduced. It should also not be too small, which would otherwise affect the response of the detector 210 to the reflected light signal. Therefore, the field angle of the receiving mirror group 220 may have a certain relationship with the divergence angle of the laser beam emitted from the exit module 10 and the size of the detector 210 under test. In one embodiment, the receiving field angle β of the receiving lens group 220 satisfies:
α＜β＜2×arctan(D/2f)
wherein, the divergence angle of the laser beam emitted from the α -emitting module 10, D is the size of the detector 210 to be detected, and f is the focal length of the receiving lens group 220. In a more specific embodiment, the field angle of the receiving lens group 220 may be 0.8 °, the divergence angle of the laser beam emitted from the exit module 10 may be 0.1 °, the size of the detector 210 to be detected may be 5mm × 5mm, and the focal length of the receiving lens group 220 may be 42mm. Therefore, the field angle of the receiving lens group 220 can satisfy α < β < 2 × arctan (D/2 f). In this embodiment, the detector 210 to be tested can be disposed at the focal plane of the receiving lens assembly 220. Therefore, the receiving angle of the receiving mirror group 220 can be larger than the divergence angle of the light path of the exit module 10.
It is understood that the under-test detector 210 and the receiving mirror assembly 220 may constitute the receiving module 20, and the receiving mirror assembly 220 may collect the reflected light signals and focus the reflected light signals on the under-test detector 210. In addition, the direction of the receiving module 20 can be parallel to the direction of the laser emitted by the emitting module 10, so that the reflected light signal reflected by the preset target can be ensured to be incident on the receiving module 20, and the effectiveness of the grouping process of the detector 210 to be detected is ensured. In one embodiment, the distance between the emitting module 10 and the receiving module 20 in the direction perpendicular to the emitting direction of the laser signal is 10mm. It can be understood that, the distance between the emitting module 10 and the receiving module 20 in the direction perpendicular to the emitting direction of the laser signal is 10mm, which not only can ensure that the emitting optical path formed by the emitting module 10 and the receiving optical path formed by the receiving module 20 do not affect each other, but also can prevent the reflected light signal received by the receiving module 20 when the receiving module 20 is far away from the emitting module 10 from being greatly reduced. Therefore, the distance between the emitting module 10 and the receiving module 20 in the direction perpendicular to the emitting direction of the laser signal is 10mm, which can ensure the grouping accuracy of the detector 210 to be tested.
In one embodiment, the detector detection system 100 workflow may be: the laser 110 in the emitting module 10 generates a predetermined emitting light signal under the control of the emitting driver, and the predetermined emitting light signal is emitted to the surface of the predetermined target through the emitting mirror group 120. The surface of the predetermined target responds to the predetermined emergent light signal, and the reflected light signal carrying the surface information of the predetermined target is captured by the receiving lens group 220 and focused on the detector 210 to be detected. In this embodiment, since the size of the reflected light signal is much smaller than that of the detector 210 to be measured in the focused state, it can be ensured that the reflected light spot accurately falls on the detector 210 to be measured when the detector 210 to be measured is replaced. The detector 210 to be measured converts the received reflected optical signal into a reflected electrical signal, and transmits the reflected electrical signal to the data processing module 30. The data processing module 30 may determine the amplitude of the reflected electrical signal according to the received reflected electrical signal, and group the to-be-detected detectors 210 according to the amplitude of the reflected electrical signal and a preset group division rule.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (12)
1. A method of detecting a detector, comprising:
fixing a detector to be detected;
judging whether the parameter of the preset emergent light signal is within a preset parameter range or not;
if the parameter is not in the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal, including: when the parameter is a divergence angle, obtaining the divergence angle of the emergent light signal according to the size of a light spot; judging whether the divergence angle exceeds a preset divergence angle range or not; if the divergence angle is larger than the maximum value of the preset divergence angle range, adjusting the emission mirror group to reduce the divergence angle; if the divergence angle is smaller than the minimum value of the preset divergence angle range, adjusting the emission mirror group to increase the divergence angle; transmitting the preset emergent light signal to a preset target;
the detector to be detected receives a reflected light signal of the preset emergent light signal reflected by the preset target and converts the reflected light signal into a reflected electric signal;
receiving a reflected electrical signal output by the detector to be detected, and determining the amplitude of the reflected electrical signal;
grouping the detectors to be tested according to the amplitudes of the reflected electrical signals, comprising:
sequencing the detectors to be tested according to the amplitude of the corresponding reflected electrical signals, and grouping the sequenced detectors to be tested according to a preset proportion; alternatively, the first and second electrodes may be,
and setting a plurality of preset amplitude values, comparing the amplitude values of the reflected electric signals corresponding to a plurality of detectors to be detected with the plurality of preset amplitude values, and dividing the detectors to be detected into a plurality of groups according to the comparison result.
2. The detector detection method of claim 1, wherein the parameters are transmit power and divergence angle.
3. The detector detection method according to claim 1,
when the parameter is the transmitting power, if the parameter is not in the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal, including:
obtaining the emission power of the emergent light signal according to a feedback signal;
judging whether the transmitting power exceeds a preset transmitting power range or not;
if the transmitting power is larger than the maximum value of the preset transmitting power range, controlling the transmitting drive to reduce the drive signal;
and if the transmitting power is smaller than the minimum value of the preset transmitting power range, controlling the transmitting drive to increase the driving signal.
4. The detector detection method of claim 1,
when the parameter is the transmission power, if the parameter is not in the preset parameter range, after dynamically adjusting the parameter of the preset emergent light signal, the method further includes:
judging whether the dynamically adjusted transmitting power is within a preset transmitting power range;
if the transmitting power is not within the preset transmitting power range, judging whether the driving signal is larger than an alarm threshold value or not;
and if the driving signal is greater than the alarm threshold value, generating and outputting an alarm signal.
5. The method according to claim 1, wherein the sorting the detectors to be tested according to the amplitudes of the corresponding reflected electrical signals, and grouping the sorted detectors to be tested according to a preset ratio comprises:
when the preset proportion is A%, B% and C%, dividing the to-be-detected detectors corresponding to the amplitude of the first A% of the reflected electrical signals into a first group, dividing the to-be-detected detectors corresponding to the amplitude of the middle B% of the reflected electrical signals into a second group, and dividing the to-be-detected detectors corresponding to the amplitude of the second C% of the reflected electrical signals into a third group; wherein the sum of A%, B% and C% is 1.
6. The method for detecting the detector according to claim 1, wherein the setting a plurality of preset amplitudes, comparing the amplitudes of the reflected electrical signals corresponding to a plurality of the detectors to be detected with the preset amplitudes, and dividing the detectors to be detected into a plurality of groups according to the comparison result comprises:
setting a first preset amplitude value;
dividing the corresponding detectors to be detected with the amplitude of the reflected electric signal smaller than a first preset amplitude into a first group;
and dividing the corresponding detector to be detected with the amplitude value of the reflected electric signal greater than or equal to the first preset amplitude value into a second group.
7. The method as claimed in claim 1, wherein the setting a plurality of preset amplitudes, comparing the amplitudes of the reflected electrical signals corresponding to a plurality of the detectors to be tested with the preset amplitudes, and dividing the detectors to be tested into a plurality of groups according to the comparison result comprises:
setting a first preset amplitude value of \8230andan Nth preset amplitude value from small to large;
dividing the corresponding detectors to be detected with the amplitude of the reflected electrical signal smaller than the first preset amplitude into a first group;
dividing the corresponding detectors to be detected with the amplitude of the reflected electrical signal larger than or equal to a first preset amplitude and smaller than a second preset amplitude into a second group;
by analogy, dividing the detector to be detected with the amplitude of the corresponding reflected electrical signal being greater than or equal to the Nth preset amplitude into a (N + 1) th group;
wherein N is not less than 2 and N is an integer.
8. The method as claimed in claim 1, wherein before the probe under test receives the reflected light signal of the predetermined emergent light signal reflected by the predetermined target, the method further comprises:
and controlling the receiving drive to load a preset bias voltage on the detector to be detected.
9. A detector detection system, comprising:
the emitting module comprises a laser and an emitting driver, and is used for generating a preset emitting light signal and emitting the preset emitting light signal to a preset target;
the data processing module is electrically connected with the detector to be detected;
judging whether the parameter of the preset emergent light signal is within a preset parameter range or not; if the parameter is not in the preset parameter range, dynamically adjusting the parameter of the preset emergent light signal, including: when the parameter is a divergence angle, obtaining the divergence angle of the emergent light signal according to the size of a light spot; judging whether the divergence angle exceeds a preset divergence angle range or not; if the divergence angle is larger than the maximum value of the preset divergence angle range, adjusting the emission mirror group to reduce the divergence angle; if the divergence angle is smaller than the minimum value of the preset divergence angle range, adjusting the emission mirror group to increase the divergence angle;
the receiving module comprises a detector to be detected and a receiving driver, and is used for receiving a reflected light signal of the preset emergent light signal reflected by the preset target and converting the reflected light signal into a reflected electric signal; and
the data processing module is further used for determining the amplitude of the reflected electrical signal according to the reflected electrical signal output by the detector to be detected;
the data processing module is further configured to receive the reflected electrical signal, determine an amplitude of the reflected electrical signal, and group the detector to be detected according to the amplitude of the reflected electrical signal, including: sequencing the detectors to be tested according to the amplitude of the corresponding reflected electric signals, and grouping the sequenced detectors to be tested according to a preset proportion; or, setting a plurality of preset amplitudes, comparing the amplitudes of the reflected electrical signals corresponding to the plurality of detectors to be detected with the plurality of preset amplitudes, and dividing the detectors to be detected into a plurality of groups according to the comparison result.
10. The detector detection system of claim 9, wherein the receiving module further comprises a set of receiving mirrors configured to collect the reflected light signals and focus the reflected light signals onto the detector under test.
11. The detector detection system of claim 9, wherein the detector under test is located at a focal position of the set of receiving mirrors, and a center of the detector under test is collinear with a primary optical axis of the set of receiving mirrors.
12. The detector detection system of claim 9, wherein the receiving field angle β of the set of receiving mirrors satisfies:
α<β<2×arctan(D/2f)
wherein α is a divergence angle of the laser beam emitted by the emitting module, D is a size of the detector to be detected, and f is a focal length of the receiving lens group.
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