CN112904320A - Optical module testing method and system - Google Patents
Optical module testing method and system Download PDFInfo
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- CN112904320A CN112904320A CN202110492478.0A CN202110492478A CN112904320A CN 112904320 A CN112904320 A CN 112904320A CN 202110492478 A CN202110492478 A CN 202110492478A CN 112904320 A CN112904320 A CN 112904320A
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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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- 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
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
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Abstract
The application discloses an optical module testing method and system, and relates to the technical field of optics. The method comprises the following steps: placing a plurality of targets according to different sampling distances, wherein the different sampling distances are respectively set according to the field angle and the maximum measuring distance of the optical module to be tested; the optical module to be tested emits light beams to a plurality of targets; receiving the light beams reflected by the plurality of targets; and calculating the actual measurement distances of the plurality of target objects according to the received reflected light beams and acquiring the actual measurement field angle according to the received reflected light beams so as to acquire a test result. According to the method, various different target objects and sampling positions are respectively set according to the angle of view and the maximum measuring distance of the optical module to be tested for testing, and the simple, flexible and effective testing of the angle of view and the sampling distance is realized.
Description
Technical Field
The present application relates to the field of optical technologies, and in particular, to a method and a system for testing an optical module.
Background
TOF (Time Of Flight) 3D imaging is an important milestone for the development Of the artificial intelligence machine vision industry, and with the rapid development Of artificial intelligence 3D sensing and machine vision technologies, the TOF technology is rapidly developed. The TOF module is an optical module for distance measurement, and its working principle is to continuously emit light pulse signals (usually infrared light pulse signals) to a target, receive the light pulse signals reflected by the target, measure the distance of the target by detecting the round-trip flight time of the light pulse signals, and output target distance data.
TOF technology adopts an active light detection mode, mainly comprises two types, one type is I-TOF, distance information is obtained through phase difference, and finally depth information is obtained; the other is D-TOF, which measures the time difference between the light emission and the reflected light to obtain distance information and finally depth information. No matter which kind of technique's TOF module is adopted, for guaranteeing that it can realize normal range finding function, the angle of field and the range finding ability that need be directed against the TOF module in the testing process that dispatches from the factory test, but present test method is comparatively single, and the flexibility is not enough.
Disclosure of Invention
In view of this, embodiments of the present application provide an optical module testing method and system, so as to solve the problems of single method and insufficient flexibility in the TOF module testing process in the prior art.
In a first aspect, an embodiment of the present application provides an optical module testing method, where the method includes:
placing a plurality of targets according to different sampling distances, wherein the different sampling distances are respectively set according to the field angle and the maximum measuring distance of the optical module to be tested;
the optical module to be tested emits light beams to the plurality of targets, wherein the divergence angle of the light beams is larger than or equal to the field angle of the optical module to be tested;
the optical module to be tested receives the light beams reflected by all the targets;
calculating an actual measurement distance of a corresponding target object according to a reflected light beam received by the optical module to be tested, judging whether the actual measurement distance is within a preset distance error range, and obtaining a first judgment result;
acquiring an actual measurement field angle according to a reflected light beam which can be received by the optical module to be tested, judging whether the actual measurement field angle is within a preset angle error range, and acquiring a second judgment result;
and outputting the actual measurement distance and the actual measurement angle of view test results according to the first judgment result and the second judgment result.
Preferably, the calculating an actual measurement distance of the corresponding target object according to the reflected light beam received by the optical module to be tested, determining whether the actual measurement distance is within a preset distance error range, and obtaining a first determination result includes:
when the actual measured distance is within the preset distance error range, the first judgment result indicates that the distance measuring capability of the optical module to be tested reaches the standard;
and when the actual measured distance is not within the preset distance error range, the first judgment result indicates that the distance measurement capability of the optical module to be tested does not reach the standard.
Preferably, the acquiring an actual measurement field angle according to the reflected light beam that can be received by the optical module to be tested, determining whether the actual measurement field angle is within a preset angle error range, and acquiring a second determination result includes:
when the actual measurement field angle is within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested reaches the standard;
and when the actual measured field angle is not within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested does not reach the standard.
Preferably, the placing of the plurality of targets at different sampling distances comprises:
and sequentially placing a plurality of target objects with different sizes according to different sampling distances in the field angle range of the optical module to be tested, wherein each target object has no overlapping area between every two target objects in the field angle range.
Preferably, the field angles of each target to the optical module to be tested are equal.
Preferably, the placing of the plurality of targets at different sampling distances comprises:
in the field angle range of the optical module to be tested, a target is placed at the center of the field of view and two targets are placed at the edge of the field of view respectively, wherein the sampling distances corresponding to the three targets are different, and the sampling distances are different.
Preferably, the placing of the plurality of targets at different sampling distances comprises:
the method comprises the steps of placing a fixed target at the maximum sampling distance and respectively placing a movable target at two marginal field-of-view positions, wherein the maximum sampling distance is equal to the maximum testing distance of an optical module to be tested, the sampling distance of the movable target is smaller than the maximum sampling distance, and the movable target rotates or overturns along the fixed point to enter or leave the field angle of the optical module to be tested.
Preferably, the placing the plurality of targets at different sampling distances further comprises:
and placing a plurality of targets with different sizes in the field range of the optical module to be tested according to different sampling distances.
Preferably, the placing of the plurality of targets at different sampling distances comprises:
and fixing the optical module to be tested on a rotating mechanism, taking the rotating center of the rotating mechanism as a dot, placing a plurality of target objects with different sizes along the circumferential direction according to different sampling distances, and enabling each target object to have no overlapping area between every two target objects within the range of the field angle.
Preferably, the opening angle of each target to the optical module to be tested is equal.
Preferably, the placing the plurality of targets at different sampling distances further comprises:
and placing a curled target object along the rotation direction of the rotation mechanism, wherein the curling direction of the curled target object is the same as the rotation direction.
In a second aspect, an embodiment of the present application provides an optical module testing system, which includes at least one optical module to be tested and a plurality of targets with different sizes and placed at different sampling distances, so as to implement the optical module testing method according to any one of the first aspect.
To sum up, the beneficial effect of this application is as follows:
in summary, the optical module testing method and system provided by the embodiment of the present application respectively set various different target objects and sampling positions according to the angle of view and the maximum measurement distance of the optical module to be tested, so as to implement simple, flexible and effective testing of the angle of view and the sampling distance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, without any inventive work, other drawings can be obtained according to the drawings, and these drawings are all within the scope of the present application.
Fig. 1 is a schematic flow chart illustrating an optical module testing method according to an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
FIG. 3 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
FIG. 4 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
FIG. 5 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
FIG. 6 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
FIG. 7 is a schematic diagram of placement of multiple targets at different sampling distances according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example one
The embodiment of the application provides an optical module testing method, which is used for testing key indexes such as a field angle, a maximum measuring distance (distance measuring capacity) and the like of an optical module for realizing 3D distance measurement, such as a TOF module. The optical module to be tested comprises a transmitting end and a receiving end, wherein the transmitting end emits light beams, and the receiving end receives the light beams reflected by the target object to measure the distance. The embodiment of the application tests the field angle and the distance measuring capability through equipment of the target object at various different positions.
Referring to fig. 1, the method includes the following steps:
s1: placing a plurality of targets according to different sampling distances, wherein the different sampling distances are respectively set according to the field angle and the maximum measuring distance of the optical module to be tested;
s2: the optical module to be tested emits light beams to the plurality of targets, wherein the divergence angle of the light beams is larger than or equal to the field angle of the optical module to be tested;
s3: the optical module to be tested receives the light beams reflected by all the targets;
s4: calculating an actual measurement distance of a corresponding target object according to a reflected light beam received by the optical module to be tested, judging whether the actual measurement distance is within a preset distance error range, and obtaining a first judgment result;
s5: acquiring an actual measurement field angle according to a reflected light beam which can be received by the optical module to be tested, judging whether the actual measurement field angle is within a preset angle error range, and acquiring a second judgment result;
s6: and outputting the actual measurement distance and the actual measurement angle of view test results according to the first judgment result and the second judgment result.
When the emission end of the optical module to be tested emits light beams, the divergence angle of the light beams needs to be larger than or equal to the angle of view of the receiving end of the optical module to be tested so as to avoid influencing the correct measurement of the angle of view of the optical module to be tested. When the angle of view and the maximum measuring distance are tested, a plurality of targets are placed at a plurality of positions which are separated from the optical module to be tested by different sampling distances, wherein the positions for placing the targets are determined according to the angle of view and the maximum measuring distance of the optical module to be tested. The field angle and the maximum measurement distance of the optical module to be tested refer to the field angle and the maximum measurement distance calibrated by the ranging sensor in the optical module to be tested when the ranging sensor leaves a factory. The optical module to be tested is set at a plurality of different positions according to the angle of view and the maximum measurement distance of the optical module to be tested, and an object is placed at each position respectively. The method comprises the following steps that light beams emitted by an emitting end of an optical module to be tested are reflected back by a plurality of targets, a receiving end calculates actual measurement distances of the targets according to received reflected light beams and obtains an actual maximum measurement distance, and whether the actual measurement distance and the actual maximum measurement distance are within a preset distance error range is judged; meanwhile, the receiving end obtains an actual measurement field angle according to the reflected light beam which can be received by the receiving end, and therefore whether the actual measurement field angle is within a preset angle error range is judged.
In one embodiment, the calculating an actual measurement distance of a corresponding target object according to a reflected light beam received by the optical module to be tested, determining whether the actual measurement distance is within a preset distance error range, and obtaining a first determination result includes:
when the actual measured distance is within the preset distance error range, the first judgment result indicates that the distance measuring capability of the optical module to be tested reaches the standard;
and when the actual measured distance is not within the preset distance error range, the first judgment result indicates that the distance measurement capability of the optical module to be tested does not reach the standard.
The step of obtaining an actual measurement field angle according to the reflected light beam which can be received by the optical module to be tested, judging whether the actual measurement field angle is within a preset angle error range, and obtaining a second judgment result comprises the following steps:
when the actual measurement field angle is within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested reaches the standard;
and when the actual measured field angle is not within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested does not reach the standard.
If the obtained actual maximum measuring distance is within the preset distance error range, the distance measuring capability of the optical module to be tested reaches the distance measuring standard calibrated when the optical module to be tested leaves the factory, the testing result of the distance measuring capability of the optical module to be tested is judged to reach the standard, namely the first judging result is that the distance measuring capability of the optical module to be tested reaches the standard. If the obtained actual maximum measuring distance is not within the preset distance error range, the distance measuring capability of the optical module to be tested does not reach the standard calibrated in the factory, the testing result of the distance measuring capability of the optical module to be tested is judged to be not up to the standard, and the first judging result is that the distance measuring capability of the optical module to be tested is not up to the standard.
Similarly, if the obtained actual measurement field angle is within the preset angle error range, the field angle of the optical module to be tested is considered to reach the standard calibrated in factory delivery, and the test result of the field angle of the optical module to be tested is judged to reach the standard, namely the second judgment result is that the field angle of the optical module to be tested reaches the standard. If the obtained actual measured field angle is not within the preset angle error range, the field angle of the optical module to be tested does not reach the field angle standard calibrated in the factory, and the test result of the field angle of the optical module to be tested is judged to be not up to standard, namely the second judgment result is that the field angle of the optical module to be tested is not up to standard.
And outputting the test results of the actual measurement distance and the actual measurement field angle according to the first judgment result and the second judgment result.
In one embodiment, when the test result of the distance measuring capability and/or the field angle of the optical module to be tested does not meet the standard, the optical module to be tested is debugged again until the test result of the distance measuring capability and the field angle of the test optical module meets the standard.
In one embodiment, a plurality of targets are placed as shown in FIG. 2, preferably the targets are flat objects. Within the field angle range of the optical module 100 to be tested, a plurality of targets (the target 201 to the target 205) are sequentially placed at different depths (sampling distances), the size of each target is different according to the sampling distance from the optical module to be tested, the size of the target 201 closer to the optical module 100 to be tested is smaller, and the size of the target 205 farther from the optical module 1 to be tested is larger. And each object has no overlapping area in the field angle range, and preferably, the field angle of each object to the optical module 1 to be tested is equal. The spacing between sampling distances may be the same or different, with the largest sampling distance set as the largest measured distance for the optical die set 100 to be tested. After the target plates are placed according to different sampling distances, the transmitting end of the optical module to be tested 100 emits light beams with divergence angles larger than or equal to the field angle of the optical module to be tested 100, and the receiving end receives the light reflected by each target object for calculation and comparison, so that the tests of the field angle, different sampling distances and the maximum sampling distance are completed. The test mode of the embodiment can simultaneously complete the test of the angle of view and different sampling distances, and the operation is simple and convenient.
In one embodiment, as shown in fig. 3, a plurality of targets are placed, and within the field angle range of the optical module to be tested 100, a target 301 is placed at the center of the field of view and targets 303 and 302 are placed at the edges of the field of view, wherein the sampling distances of the three targets from the optical module to be tested 1 are different, and the sampling distance of the target 301 is set as the maximum measurement distance of the optical module to be tested 100. The sampling distance between the object 302 and the object 303 may be set according to an actual test scenario, and is not limited herein. After the three targets are placed according to different sampling distances, the transmitting end of the optical module to be tested 100 emits light beams with divergence angles larger than or equal to the field angle of the optical module to be tested 100, and the receiving end receives the light reflected by each target to calculate and compare, so that the tests of the field angle, different sampling distances and the maximum sampling distance are completed. The test mode of the embodiment can simultaneously complete the test of the angle of view and different sampling distances and the maximum measurement distance at the edge of the field of view, and has fewer targets to be arranged and simpler and more convenient operation.
In one embodiment, several targets are placed as shown in fig. 4, wherein a fixed target 401 is placed at the maximum measurement distance (maximum sampling distance), a movable target 402 and a movable target 403 are respectively placed at two sides of the marginal field of view of the optical module 100 to be tested, and the movable target 402 and the movable target 403 can be rotated or flipped along the fixed point to enter or leave the field angle of the optical module 100 to be tested. After the target plate is placed, the transmitting end of the optical module to be tested 100 emits light beams with divergence angles larger than or equal to the field angle of the optical module to be tested 100, and the receiving end receives the light beams reflected by all the targets for calculation and comparison, so that the tests of the field angle, the two groups of sampling distances and the group of maximum sampling distances are completed. The test scene of the embodiment is relatively fixed, the operation is simple and convenient, and the test of the maximum measurement distance, the field angle and the two sampling distances of the field edge can be simultaneously carried out.
In one embodiment, several targets are placed as shown in fig. 5, a fixed non-target 501 is placed at the maximum measurement distance (maximum sampling distance), a movable target 502 and a movable target 503 are respectively placed at two sides of the marginal field of view of the optical module 100 to be tested, the movable target 502 and the movable target 503 can be rotated or turned along the fixed point to enter or leave the field angle of the optical module 100 to be tested, and in addition, the movable target 504 and the movable target 505 are placed at different sampling distances within the field of view of the optical module to be tested. After each target object is placed, the transmitting end of the optical module to be tested 100 emits light beams with divergence angles larger than or equal to the field angle of the optical module to be tested 100, and the receiving end receives the light beams reflected by each target object for calculation and comparison, so that the test of the field angle, the sampling distance at the edge of the field, different sampling distances in the field and the test of the maximum sampling distance are completed. The test scene of the embodiment is relatively fixed, the operation is simple and convenient, and the maximum measurement distance, the field angle and different sampling distances can be tested at the same time.
In one embodiment, as shown in fig. 6, the optical module 100 to be tested is fixed on the rotating mechanism 200, the rotating center of the rotating mechanism 200 is used as a dot, the targets (the target 601 to the target 613) are placed at different depths (different sampling distances) along the circumferential direction, and each target has no overlapping area in the range of the angle of view, preferably, each target covers the angle of view of the module, and the field angle of each target corresponding to the optical module 100 to be tested is equal, and the smaller the size of the target closer to the optical module 100 to be tested is, the larger the size of the target farther from the optical module 1 to be tested is, wherein the largest sampling distance is set as the largest measuring distance of the optical module 100 to be tested. During testing, the optical module 100 to be tested samples the fixed-point distance at the position 1 and then rotates to the position 2 to test the field angle; further, the optical module 100 to be tested performs the test of the maximum measurement distance at the position 1, rotates to the position 2 to perform the test of the field angle, and then rotates clockwise to complete the test of the multi-point sampling distance at the positions 3-14. In the embodiment, the target objects in all the distance sampling points cover the field angle of the module, the echo signals are basically close to the maximum, and the obtained test result is more accurate.
In one embodiment, as shown in fig. 7, the optical module 100 to be tested is fixed on the rotation mechanism 200, and the rotation center of the rotation mechanism 200 is used as a dot, except that the target 701 is placed at the position 1, and a curled target 703 is placed at the beginning of the position 3, and the curled target 703 can cover the positions 3 to 14. During testing, the optical module 100 to be tested performs sampling test of the maximum measurement distance at the position 1, and then rotates to the position 2 to perform test of the field angle; when the optical module 100 to be tested is rotated from the position 3 to the position 14, the test for using the continuous distance can be completed. The test mode of the embodiment can simultaneously complete the test of the field angle, the maximum measurement distance and the continuous sampling distance, and the echo signals of all the adopted points are close to the maximum, so that the obtained test effect is more accurate.
In summary, the optical module testing method provided by the embodiment of the present application respectively sets different sampling positions and different target objects with different sizes according to the field angle and the maximum measurement distance of the optical module to be tested, so as to implement simple, flexible and effective testing of the field angle and the sampling distance.
Example two
The embodiment of the application provides an optical module testing system, optical module testing system includes an optical module and a plurality of target object of placing and the size is different according to different adoption positions that await measuring. The transmitting end of the optical module to be tested emits light beams to a plurality of targets placed according to different sampling distances, and the receiving end receives the light beams reflected by the targets, so that the field angle tests of the optical module to be tested at different sampling distances are completed.
In one embodiment, as shown in fig. 2, the optical module testing system includes an optical module to be tested and a plurality of targets with different sizes, the targets with different sizes are sequentially placed at different depths (sampling distances) within the field angle range of the optical module 100 to be tested, and the module to be tested emits a light beam onto the targets with different sizes to test the field angle, the different sampling distances and the maximum sampling distance. The optical module testing system of the embodiment can simultaneously complete the testing of the field angle and different sampling distances, and is simple and convenient to operate.
In one embodiment, as shown in fig. 3, the optical module testing system includes a module under test 100 and three targets with different sizes, the three targets with different sizes are respectively at the center position and two edge positions of the field of view, and the module under test emits light beams onto the three targets with different sizes to test the field angle, different sampling distances at the edges of the field of view, and the maximum measurement distance. The optical module testing system of the embodiment can simultaneously complete the testing of the angle of view and different sampling distances and the maximum measuring distance at the edge of the field of view, and has the advantages of less target objects to be arranged and simpler and more convenient operation.
In one embodiment, as shown in fig. 4, the optical module testing system includes a module under test 100, a fixed object 401 and two movable objects 402 and 403, and the movable object 402 and the movable object 403 can rotate or turn around the fixed point to enter or leave the field angle of the optical module under test 100. And the module to be tested emits light beams to the three target objects to test the field angle, the sampling distance at the edge of the field and the maximum measuring distance. The optical module testing system of the embodiment is relatively fixed, is simple and convenient to operate, and can simultaneously test the maximum measuring distance, the field angle and two sampling distances of the field edge. The optical module testing system of the embodiment has a simple structure and is easy and convenient to operate.
In one embodiment, as shown in fig. 5, the optical module testing system includes a module under test 100, a fixed target 501 and four movable targets (target 502, target 503, target 504 and target 505), the movable target 502 and the movable target 503 can rotate or turn along the fixed point to enter or leave the field angle of the optical module under test 100, and in addition, the movable target 504 and the movable target 505 are placed at different sampling distances within the field range of the optical module under test. And the module to be tested emits light beams to each target object to test the field angle, the sampling distance of the edge of the field, different sampling distances in the field and the maximum sampling distance. The optical module testing system of the embodiment is simple, simple and convenient to operate and flexible in setting.
In one embodiment, as shown in fig. 6, the optical module testing system includes a module under test 100, a rotating mechanism 200, and targets (target 601 to target 613) placed at different depths (different sampling distances) along a circumferential direction, and the module under test emits light beams onto the targets for testing at a field angle, different sampling distances, and a maximum sampling distance. The optical module testing system of the embodiment has larger echo signal of each distance sampling point, and the obtained testing result is more accurate.
In one embodiment, as shown in fig. 7, the optical module testing system includes a module under test 100, a rotating mechanism 200, targets 701 and 703, and the module under test emits light beams onto the targets for testing at a field angle, a continuous sampling distance and a maximum sampling distance. The echo signal of the optical module testing system of the embodiment sampled at a continuous distance is basically close to the maximum, and the obtained testing result is more accurate.
In summary, the optical module testing method and system provided by the embodiment of the present application respectively set different sampling positions and different sizes of target objects for testing according to the angle of view and the maximum measurement distance of the optical module to be tested, thereby achieving simple, flexible and effective testing of the angle of view and the sampling distance.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (12)
1. A method of testing an optical module, the method comprising:
placing a plurality of targets according to different sampling distances, wherein the different sampling distances are respectively set according to the field angle and the maximum measuring distance of the optical module to be tested;
the optical module to be tested emits light beams to the plurality of targets, wherein the divergence angle of the light beams is larger than or equal to the field angle of the optical module to be tested;
the optical module to be tested receives the light beams reflected by all the targets;
calculating an actual measurement distance of a corresponding target object according to a reflected light beam received by the optical module to be tested, judging whether the actual measurement distance is within a preset distance error range, and obtaining a first judgment result;
acquiring an actual measurement field angle according to a reflected light beam which can be received by the optical module to be tested, judging whether the actual measurement field angle is within a preset angle error range, and acquiring a second judgment result;
and outputting the actual measurement distance and the actual measurement angle of view test results according to the first judgment result and the second judgment result.
2. The method as claimed in claim 1, wherein the calculating an actual measurement distance of a corresponding target according to the reflected light beam received by the optical module to be tested, and determining whether the actual measurement distance is within a predetermined distance error range and obtaining a first determination result comprises:
when the actual measured distance is within the preset distance error range, the first judgment result indicates that the distance measuring capability of the optical module to be tested reaches the standard;
and when the actual measured distance is not within the preset distance error range, the first judgment result indicates that the distance measurement capability of the optical module to be tested does not reach the standard.
3. The method for testing an optical module according to claim 1, wherein the obtaining an actual measurement field angle according to a reflected beam that can be received by the optical module to be tested, and the determining whether the actual measurement field angle is within a preset angle error range and obtaining a second determination result comprises:
when the actual measurement field angle is within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested reaches the standard;
and when the actual measured field angle is not within the preset angle error range, the second judgment result indicates that the field angle of the optical module to be tested does not reach the standard.
4. The method for testing an optical module according to any of claims 1-3, wherein the placing of the plurality of targets at different sampling distances comprises:
and sequentially placing a plurality of target objects with different sizes according to different sampling distances in the field angle range of the optical module to be tested, wherein each target object has no overlapping area between every two target objects in the field angle range.
5. The method of claim 4, wherein the opening angle of each target to the optical module under test is equal.
6. The method for testing an optical module according to any of claims 1-3, wherein the placing of the plurality of targets at different sampling distances comprises:
in the field angle range of the optical module to be tested, a target is placed at the center of a field of view and a target is placed at the edge of two field of view respectively, wherein the sampling distances corresponding to the three targets are different, and the sizes of the targets are different.
7. The method for testing an optical module according to any of claims 1-3, wherein the placing of the plurality of targets at different sampling distances comprises:
the method comprises the steps of placing a fixed target at the maximum sampling distance and respectively placing a movable target at two marginal field-of-view positions, wherein the maximum sampling distance is equal to the maximum testing distance of an optical module to be tested, the sampling distance of the movable target is smaller than the maximum sampling distance, and the movable target rotates and/or turns along the fixed point to enter or leave the field angle of the optical module to be tested.
8. The method of claim 7, wherein the positioning the plurality of targets at different sampling distances further comprises:
and placing a plurality of targets with different sizes in the field range of the optical module to be tested according to different sampling distances.
9. The method for testing an optical module according to any of claims 1-3, wherein the placing of the plurality of targets at different sampling distances comprises:
and fixing the optical module to be tested on a rotating mechanism, taking the rotating center of the rotating mechanism as a dot, placing a plurality of target objects with different sizes along the circumferential direction according to different sampling distances, and enabling each target object to have no overlapping area between every two target objects within the range of the field angle.
10. The method of claim 9, wherein the opening angle of each target to the optical module under test is equal.
11. The method of claim 9, wherein the positioning the plurality of targets at different sampling distances further comprises:
and placing a curled target object along the rotation direction of the rotation mechanism, wherein the curling direction of the curled target object is the same as the rotation direction.
12. An optical module testing system comprising at least one optical module to be tested and a plurality of targets of different sizes placed at different sampling distances to implement the optical module testing method as claimed in any one of claims 1 to 11.
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| CN114509741A (en) * | 2021-12-28 | 2022-05-17 | 珠海视熙科技有限公司 | Laser radar test fixture |
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