Testing device and testing method for optical distance measuring device

Abstract

The invention provides a testing device for an optical range finder, and the device comprises a testing machine which is in communication connection with the optical range finder and is used for controlling the optical range finder to output an emission control instruction; the light emitting device is in communication connection with the optical range finder and is used for outputting emitted light in response to the emission control instruction; the receiving optical device is communicated with the light emitting device through a light transmission medium; one end of the optical transmission medium receives the emitted light output from the light emitting device, the other end outputs the emitted light to the receiving optical device, an optical transmission channel is formed between the two ends of the optical transmission medium, and the length of the optical transmission channel is set according to the expected test distance of the optical range finder; the receiving optical device projects the emitted light to the optical range finder, so that the optical range finder calculates the transmission distance of the emitted light to obtain a test distance and outputs the test distance to the test machine, and the test distance is used for the test machine to perform result operation to obtain a test result. The invention further provides a testing method of the optical range finder.

Description

Technical Field

[0001] This invention relates to the field of chip testing technology, and in particular to a testing device and method for optical ranging devices. Background Technology

[0002] The principle behind lidar's sensing capability lies in the fact that, since the speed of light is constant and known, lidar actively emits laser light and calculates the distance between the lidar and the object by the time it takes for the laser to travel to the object and reflect back. Based on this, existing technology has designed a highly sensitive optical chip with built-in emission control and high-speed timing functions, namely a dToF (Direct Time of Flight) chip, for use by lidar.

[0003] To ensure the quality of dToF chips, comprehensive functional testing is required before production and shipment. Existing testing equipment and measurement target boards are necessary. When testing the required ranging function of a dToF chip using a testing equipment, the measurement target board needs to be moved so that the actual spatial distance between the dToF chip and the measurement target board equals the expected measuring distance of the dToF chip. For example, testing the 15-meter ranging function of a dToF chip requires a physical area of ​​15 meters for the testing equipment. In other words, existing testing equipment has a very high footprint and cannot achieve the required ranging function testing of dToF chips within a conventional floor space. Summary of the Invention

[0004] In view of this, this application provides a testing device and a testing method for an optical ranging device, which enables the testing of the required ranging function of the optical ranging device in a small space.

[0005] In a first aspect, this application provides a testing apparatus for an optical ranging device, wherein the optical ranging device is used to control a light emitting device to emit light and for timing; the testing apparatus for the optical ranging device includes:

[0006] The test equipment is communicatively connected to the optical ranging device and is used to output test commands to the optical ranging device in order to control the optical ranging device to output transmission control commands.

[0007] A light emitting device, which is communicatively connected to the optical ranging device, is used to output emitted light in response to the emission control command;

[0008] A receiving optical device is connected to a light emitting device via an optical transmission medium. One end of the optical transmission medium receives emitted light from the light emitting device, and the other end outputs the emitted light to the receiving optical device. An optical transmission channel is formed between the two ends of the optical transmission medium, and the length of the optical transmission channel is set according to the desired test distance of the optical ranging device. The receiving optical device projects the emitted light onto the optical ranging device, enabling the optical ranging device to calculate the transmission distance of the emitted light, obtain the test distance, and output it to the testing machine. The test distance is used by the testing machine to perform result calculations and obtain the test result.

[0009] Secondly, this application provides a testing method for an optical ranging device, applied to a testing apparatus for the optical ranging device. The testing apparatus includes a testing platform, a light emitting device, a receiving optical device, and an optical transmission medium that forms an optical path connecting the light emitting device and the receiving optical device. The length of the optical transmission channel is set according to the desired test distance of the optical ranging device. The testing platform is communicatively connected to the optical ranging device. The testing method for the optical ranging device includes:

[0010] The control test machine outputs test commands to the optical ranging device, thereby controlling the optical ranging device to output transmission control commands;

[0011] The optical emitting device is controlled to respond to the emission control command and output emitted light so that the emitted light is transmitted to the receiving optical device through the optical transmission medium;

[0012] The receiving optical device is controlled to project the emitted light onto the optical ranging device, so that the optical ranging device calculates the transmission distance of the emitted light, obtains the test distance, and outputs it to the testing machine; and

[0013] The test machine is controlled to perform calculations based on the test distance to obtain the test result.

[0014] The aforementioned testing device and method for optical ranging devices utilize a flexible optical transmission medium to transmit emitted light, thereby eliminating the need for the required distance measurement length during testing. This significantly reduces the space occupied by the test, saving space costs and making the testing of optical ranging devices easier to implement and operate, thus greatly reducing the overall cost. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the electrical connections of the test device for the optical ranging device provided in this application.

[0017] Figure 2 This is a flowchart illustrating the testing method for the optical ranging device provided in this application.

[0018] Figure 3 This is a schematic diagram of the structure of the first embodiment of the optical transmission medium provided in this application.

[0019] Figure 4 This is a schematic diagram of the structure of the second embodiment of the optical transmission medium provided in this application.

[0020] Figure 5 This is a structural schematic diagram of the third embodiment of the optical transmission medium provided in this application.

[0021] Explanation of component symbols in the attached diagram:

[0022] Test apparatus for optical ranging devices 1 Light emitting device 13

[0023] Control platform 11 Receiving optical device 14

[0024] Test equipment 12, optical transmission medium 15

[0025] Test host 121, optical transmission channel 150

[0026] Vehicle 122 Temperature sensor 16

[0027] Several terminals 1220 optical ranging device 2

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0030] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar planned objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data used in this way can be interchanged where appropriate; in other words, the described embodiments are implemented according to a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, may also include other content; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0032] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the electrical connections of the testing apparatus for the optical ranging device provided in this application. This application provides a testing apparatus 1 for an optical ranging device, used to test whether the quality of the optical ranging device 2 is qualified, and more specifically, to test whether the sensing distance of the optical ranging device 2 reaches the expected sensing distance.

[0033] The testing device 1 includes a control platform 11, a testing machine 12, a light emitting device 13, a receiving optical device 14, a light transmission medium 15, and a temperature sensor 16. The testing machine 12 is communicatively connected to both the control platform 11 and the optical ranging device 2. The optical ranging device 2 is communicatively connected to the light emitting device 13. The light emitting device 13 is connected to the receiving optical device 14 via the light transmission medium 15. The receiving optical device 14 is positioned opposite to the optical ranging device 2. The optical ranging device 2 can be an optical ranging chip with optical ranging function, such as a dToF chip, a ToF chip, a SPAD array chip, or other radar-type ranging chips, or an optical ranging module, such as a dToF module, a ToF module, a SPAD array module, or other radar-type ranging function modules. Understandably, an optical ranging chip is an integrated circuit capable of processing and transmitting data to achieve optical ranging functionality, and an optical ranging module is a collection of hardware and software required to achieve optical ranging functionality in a specific scenario. In this embodiment, the optical ranging device 2 is an example of a dTOF chip. The light emitting device 13 is configured to emit light with a preset wavelength for testing the optical ranging device 2. For example, the emitted light from the light emitting device 3 can be light with a wavelength less than 1000nm; that is, the light emitting device 13 is a transmitter capable of emitting light with a wavelength less than 1000nm. Optionally, the emitted light is a laser, and correspondingly, the light emitting device 13 is a laser transmitter. In use, the optical ranging device 2 is configured to calculate the time difference between the emission of the detection light and the moment it is reflected by the target object and received by the optical ranging device 2, thereby obtaining the distance to the target object based on the time-of-flight principle. During testing, the light emitting device 13 emits light to simulate the emission time of the detection light. The light transmission medium 15 connects the light emitting device 13 and the receiving optical device, forming a light transmission channel 150. The emitted light is transmitted through this channel 150 to the receiving optical device 14, and then emitted by the receiving optical device 14 to be received by the optical ranging device 2 under test, simulating the flight process of the detection light from emission to reflection from the target object back to reception by the optical ranging device 2. The length of the light transmission channel 150 and the distance between the receiving optical device 14 and the optical ranging device 2 can be preset. The flight distance of the emitted light from emission to reception is known, and the true time difference between the emission and reception times can be calculated using the time-of-flight principle. This can be used to verify the accuracy of the time difference measured by the optical ranging device 2. Alternatively, the optical ranging device 2 can calculate the measured distance value based on the measured time difference and the time-of-flight principle, which can be verified against the actual distance summed from the preset length of the light transmission channel 150 and the distance between the receiving optical device 14 and the optical ranging device 2.

[0034] Optionally, in some embodiments, the optical ranging device 2 may be configured to control the light emitting device 13 to emit light in order to improve the accuracy of its calculation of time difference.

[0035] Temperature sensor 16 is set independently or integrated into control platform 11 and communicates with control platform 11 to output the sensed temperature to control platform 11. Understandably, temperature sensor 16 can also be integrated into test equipment 12.

[0036] In this embodiment, the control platform 11 is equipped with the testing software for the optical ranging device 2. Once the testing software is started, it generates control commands. Understandably, in some other embodiments, the control platform 11 may be omitted. Instead, input buttons, keys, or other controls are provided on the testing machine 12 for users to input control commands, thereby controlling the testing machine 12 to output test commands. In this embodiment, the control platform 11 is a computer. In some other embodiments, the control platform 11 may also be any other control terminal equipped with the testing software for the optical ranging device 2, such as a mobile phone or tablet computer; this is not limited here.

[0037] The testing platform 12 includes a testing host 121 and a carrier 122. The testing host 121 is communicatively connected to the control platform 11. The testing host 121 establishes a communication connection with the optical ranging device 2 through the carrier 122, and the optical ranging device 2 establishes a communication connection with the light emitting device 13 through the carrier 122. Specifically, the carrier 122 is provided with several terminals 1220, which are electrically connected to the testing host 121. The carrier 122 is used to fix the optical ranging device 2. When the optical ranging device 2 is fixed to the carrier 122, the optical ranging device 2 is electrically connected to the several terminals 1220. That is, the testing host 121 establishes a communication connection with the optical ranging device 2 through the several terminals 1220. In this embodiment, the several terminals 1220 are chip probes or pin holders. The carrier 122 contacts the chip pins of the optical ranging device 2 through the chip probes or pin holders to establish a communication connection with the optical ranging device 2. Furthermore, in this application, the carrier 122 can be automatically loaded with the optical ranging device 2 or manually loaded with the optical ranging device 2; the loading method of the optical ranging device 2 by the carrier 122 is not limited here. It is understood that since the optical ranging device 2 does not need to be directly electrically connected to the test host 121, it is more convenient to replace the optical test chip 2. Moreover, after only needing to be electrically connected to the carrier 122, there is no need to re-establish electrical connection when replacing the optical test chip 2, thereby reducing wear and tear on the test host 121.

[0038] The two ends of the optical transmission medium 15 are connected to the optical emitting device 13 and the receiving optical device 14, respectively, thereby forming an optical transmission channel 150 between the optical emitting device 13 and the receiving optical device 14. The length of the optical transmission channel 150 is the length between the optical emitting device 13 and the receiving optical device 14. The length of the optical transmission channel 150 is set according to the desired test distance of the optical ranging device. The length of the optical transmission medium 15 can be adjusted within an acceptable range of optical signal attenuation as needed for measurement. The optical transmission medium 15 is a flexible, light-transmitting material, which can be connected to the optical emitting device 13 and the receiving optical device 14 in a bent and wrapped manner while transmitting light. This not only makes the storage method of the optical transmission medium 15 more flexible and reduces the space occupied, but also significantly shortens the straight-line distance between the optical emitting device 13 and the receiving optical device 14. Optionally, the optical transmission medium 15 can be an elastically bendable light-transmitting material such as optical fiber or a highly transparent resin tube.

[0039] Understandably, since light does not travel in a straight line along an optical fiber, the selected optical transmission medium 15 is smaller than the expected measurement distance of the optical ranging device 2. That is, if the expected measurement distance is from the light emitting device 13 to the receiving optical device 14, the length of the accessed optical transmission medium 15 needs to be calculated based on a certain coefficient (or a certain ratio) to the expected measurement distance. This certain coefficient is obtained through multiple experiments with the testing device 1. Therefore, once the certain coefficient is determined experimentally, the length of the accessed optical transmission medium 15, which is also the length of the optical transmission channel, can be calculated. For example, if LT represents the length of the optical transmission channel and Lo represents the expected measurement distance, then Lo = LT * a, where a > 1. Furthermore, when testing optical ranging devices of the same specification, the length of the optical transmission medium 15 is fixed; however, when testing optical ranging devices of a different specification, it is necessary to re-obtain the appropriate length of the optical transmission medium 15 based on experiments. "Optical ranging devices of the same specification" refers to identical optical ranging devices.

[0040] Please refer to the following: Figure 3-5 , Figure 3-5 These are schematic diagrams showing the structure of the optical transmission medium 15 in three different configurations. The optical transmission medium 15 can be connected between the optical emitting device 13 and the receiving optical device 14 in any coiled shape, such as a spiral shape (with...). Figure 3 For example, serpentine (using) Figure 4 For example), and other irregular shapes (taking... Figure 5 (For example), without limitation. Understandably, the optical transmission medium 15 is connected to the test device 1 in a curled shape, so that the straight distance between the two ends of the optical transmission medium 15 is less than the length of the optical transmission channel 150, so that the test of the optical ranging device 2 does not need to occupy the required ranging length, thereby saving space occupation cost.

[0041] The following will describe in detail the testing process of the testing device 1 testing the optical rangefinder 2.

[0042] First, the temperature sensor 16 collects the ambient temperature data of the testing device 1 and transmits it to the control platform 11. The control platform 11 performs temperature compensation on the operating parameters or computational data of the optical ranging device 2 and the light emitting device 13 based on the temperature data, thereby reducing the impact of temperature changes on the performance of the optical ranging device 2 and the light emitting device 13, and ensuring their normal operation. In this embodiment, the operating parameters include, but are not limited to, the light source stability, sensor response time, and circuit parameters (such as resistance and capacitance) of the optical ranging device 2, and the threshold current, modulation current, and driver chip parameters of the light emitting device 13. The computational data includes, but is not limited to, the flight measurement time and calculated distance of the optical ranging device 2, and the optical power and spectral characteristics (such as wavelength and linewidth) of the light emitting device 13.

[0043] Next, the control platform 11 responds to the user's operation by outputting control commands to the test machine 12, so as to control the test machine 12 to output test commands to the optical ranging device 2 according to the control commands.

[0044] Next, in response to the test command, the optical ranging device 2 sends a light emission command to the light emitting device 13 to control the light emitting device 13 to emit light according to the light emission command. Therefore, the emitted light is transmitted from the light emitting device 13 to the receiving optical device 14 along the light transmission medium 15.

[0045] Next, the receiving optical device 14 projects the emitted light onto the optical ranging device 2, so that the optical ranging device 2 calculates the transmission distance of the emitted light, obtains the test distance, and outputs it to the testing platform 12. Specifically, the optical ranging device 2 calculates the test distance LI according to the first formula: LI = speed of light * timing time.

[0046] Finally, the testing machine 12 calculates the test result based on the test distance and the length of the optical transmission channel 150. This test result indicates whether the optical ranging device 2 is qualified or unqualified. Specifically, the testing machine 12 calculates the test result according to the second formula: D = LT * a - LI, where a > 1, LT represents the length of the optical transmission channel 150, LI represents the test distance, and D represents the difference between the length of the optical transmission channel 150 and the test distance. When the distance difference is not within the threshold range, a qualified test result is obtained. When the distance difference is within the threshold range, a qualified test result is obtained.

[0047] In some feasible embodiments, the control platform 11 can also determine whether the optical test chip 2 is qualified. Specifically, the test distance output by the optical ranging device 2 is transmitted to the control platform 11 through the chip test platform 12, and the control platform 11 determines whether the optical ranging device 2 is qualified based on the test distance and the length of the optical transmission channel 150.

[0048] In the above embodiments, the testing device 1 only needs to input test commands to the optical ranging device 2 to make the optical ranging device 2 output the corresponding test distance. That is to say, the testing device 1 does not need to set a measurement target plate at the desired measurement distance from the optical ranging device 2, and then use the reflected light emitted from the target plate and then emitted back to the optical ranging device 2 for measurement. Instead, the light is transmitted and projected onto the optical ranging device 2 by the light transmission medium 15. Since the light transmission medium 15 is flexible, it can be connected to the testing device 1 in a bending or rolling manner, thereby greatly reducing the space occupied by the testing device 1. At the same time, it saves space occupation costs, makes the testing of the optical ranging device easier to implement and operate, and greatly reduces the overall cost.

[0049] Please refer to the following: Figure 2 , Figure 2 This is a flowchart illustrating the testing method for the optical ranging device provided in this application. This application provides a testing method for an optical ranging device, which includes steps S101-S107.

[0050] Step S101: Control the test machine to output test commands to the optical ranging device, so as to control the optical ranging device to output transmission control commands.

[0051] In step S101, the control platform 11 and the testing machine 12 are communicatively connected. The control platform 11 responds to user operations by outputting control commands to the testing machine 12, thereby controlling the testing machine 12 to output test commands to the optical ranging device 2, and then controlling the optical ranging device 2 to output transmission control commands according to the test commands. Specifically, the testing machine 12 includes a testing host 121 and a carrier 122. The testing machine 12 is communicatively connected to the control platform 112 through the testing host 121. The carrier 12 is provided with several terminals 1220, which are used to fix the optical ranging device 2 and establish a communication connection between the testing machine 12 and the optical ranging device 2 through the terminals 1220. The testing host 121 outputs test commands according to the control commands and transmits the test commands to the optical ranging device 2 through the carrier 122. In this embodiment, the test commands are used to control the optical ranging device 2 to output transmission control commands and record the cumulative time from transmission to reception of the emitted light, and use the cumulative time to calculate the measurement distance. The emission control command is used to control the light emitting device 13 to generate and emit the corresponding emitted light. The control command is used to initiate the entire test process. Understandably, in some other feasible embodiments, the control command can also be used to pause and terminate the entire test process.

[0052] In the above embodiment, the control platform 11 is also communicatively connected to the temperature sensor 16. The temperature sensor 16 collects temperature data of the ambient temperature of the test device 1 and transmits it to the control platform 11. The control platform 11 performs temperature compensation on the operating parameters or calculation data of the optical ranging device 2 and the light emitting device 13 based on the temperature data, thereby reducing the impact of temperature changes on the performance of the optical ranging device 2 and the light emitting device 13 and ensuring the normal operation of the optical ranging device 2 and the light emitting device 13.

[0053] Step S103: Control the light emitting device to respond to the emission control command and output emitted light so that the emitted light is transmitted to the receiving optical device through the optical transmission medium.

[0054] In step S103, the optical emitting device 13 establishes a communication connection with the optical ranging device 2 via the carrier 122. One end of the optical transmission medium 15 is connected to the optical emitting device 13, and the other end is connected to the receiving optical device 14. The optical ranging device 2 generates a transmission control command according to the test command and sends the transmission control command to the optical emitting device 13 via the carrier 122. The optical emitting device 13 generates the corresponding emitted light according to the transmission control command. At the same time, the optical ranging device 2 records the current time as the light emission time T1, which is the time during which the optical ranging device 2 controls the emission of the emitted light. Furthermore, the emitted light is transmitted from the optical emitting device 13 to the receiving optical device 14 along the optical transmission medium 15.

[0055] Step S105: Control the receiving optical device to project the emitted light onto the optical ranging device, so that the optical ranging device can calculate the transmission distance of the emitted light, obtain the test distance, and output it to the test machine.

[0056] In step S105, the receiving optical device 14 is positioned opposite to the optical ranging device 2. The receiving optical device 14 receives the emitted light output from the optical transmission medium 15 and projects the emitted light onto the optical ranging device 2. The optical ranging device 2 receives the emitted light and records the current time as the light reception time T2. The light reception time T2 is the time it takes for the optical ranging device 2 to receive the returned emitted light. The optical ranging device 2 calculates the test distance LI according to the first formula and transmits the test distance LI to the test host 121 through the carrier 122. It can be understood that the test distance LI is the actual test distance of the optical ranging device 2. Specifically, the first formula is: LI = speed of light S * timing time T, where the speed of light S is the transmission speed of the emitted light in the optical transmission medium 15. The timing time T = light reception time T2 - light emission time T1, that is, the time difference between the light reception time T2 and the light emission time T1. The time difference between the light emission time T1 and the light reception time T2 is the light flight time of the emitted light in the optical transmission medium 15. Understandably, the test distance of the optical ranging device 2 depends on the time of flight of the emitted light in the optical transmission medium 15, which in turn depends on the length of the optical transmission medium 15. The required ranging function of the optical ranging device 2 can be achieved by adjusting the length of the optical transmission medium 15.

[0057] Step S107: Control the testing machine to perform result calculation based on the test distance to obtain the test result.

[0058] In step S107, the test host 121 of the test equipment 12 receives the test distance output by the optical ranging device 2, and calculates the test result based on the test distance and the length of the optical transmission channel 150 to determine whether the optical test chip 2 is qualified. Specifically, when the distance difference is not within the threshold range, a failed test result is obtained. When the distance difference is within the threshold range, a qualified test result is obtained. In this embodiment, the test equipment 12 calculates the distance difference according to the second formula. The second formula is: D = Lo - LI, Lo = LT * a, where a > 1. Lo represents the expected measurement distance of the optical ranging device 2, LI represents the actual test distance of the optical ranging device 2, and D represents the difference between the expected measurement distance and the actual test distance. LT represents the length of the optical transmission channel 150, and a represents the coefficient of the length LT of the optical transmission channel 150. This coefficient is obtained by conducting multiple tests on the test device 1. Therefore, Lo is the length of the accessed optical transmission medium 15 converted according to the coefficient a.

[0059] In this embodiment, the optical rangefinder 2 can be tested with any target test item by the testing device 1 to determine whether the optical rangefinder 2 is qualified. Understandably, the target test item is any distance within the measurable range of the optical rangefinder 2, such as 15m, 12m, 5m, etc. In other feasible embodiments, the optical rangefinder 2 needs to undergo multiple target test items. When the test result of one target test item is unqualified, the optical rangefinder 2 is directly determined to be unqualified, and the test of the next target test item is not continued. Only when the test results of all target test items are qualified is the optical rangefinder 2 determined to be qualified.

[0060] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0061] The above-listed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A testing apparatus for an optical distance measuring device, the optical distance measuring device being based on a time-of-flight principle for distance measurement; characterized in that, The testing device of the optical distance measuring device comprises: a testing machine connected in communication with the optical distance measuring device, configured to output a testing instruction to the optical distance measuring device to control the optical distance measuring device to output a transmission control instruction; a light transmission device connected in communication with the optical distance measuring device, configured to output transmission light in response to the transmission control instruction; a receiving optical device connected in communication with the light transmission device via a light transmission medium, one end of the light transmission medium being configured to receive the transmission light output from the light transmission device, the other end of the light transmission medium being configured to output the transmission light to the receiving optical device, a light transmission channel being formed between the two ends of the light transmission medium, the length of the light transmission channel being set according to a desired testing distance of the optical distance measuring device, the receiving optical device being configured to project the transmission light to the optical distance measuring device, so that the optical distance measuring device calculates a transmission distance of the transmission light as the testing distance and outputs the testing distance to the testing machine, the testing distance being used by the testing machine to perform result calculation to obtain a testing result.

2. The apparatus for testing optical ranging devices of claim 1, wherein, A straight-line distance between the two ends of the light transmission medium is less than the length of the light transmission channel.

3. The apparatus of claim 2, wherein The light transmission medium is connected in a coiled manner between the light transmission device and the receiving optical device, so that the straight-line distance between the two ends of the light transmission medium is less than the length of the light transmission channel.

4. The apparatus of claim 1, wherein, The light transmission medium is an optical fiber or a highly transparent resin hose.

5. The apparatus of claim 1, wherein The testing machine comprises a testing host and a carrier, the carrier being provided with a plurality of terminals, the carrier being configured to fix the optical distance measuring device and establish communication between the testing machine and the optical distance measuring device through the terminals.

6. The test device of claim 1, wherein, The testing machine calculates a testing result according to the length of the light transmission channel and the testing distance, the testing result being used to represent pass or fail, the testing machine calculating the testing result according to the length of the light transmission channel and the testing distance specifically comprising: The test machine calculates a distance difference value according to the length of the optical transmission channel and the test distance according to a formula: D=L T* a-L I , a>1; wherein, L T represents the length of the optical transmission channel, L I represents the test distance, D represents the difference between the length of the optical transmission channel and the test distance, and a represents a coefficient of the length L T of the optical transmission channel. obtaining a fail result when the distance difference is not within a threshold range; obtaining a pass result when the distance difference is within the threshold range.

7. The apparatus of claim 1, wherein The testing device of the optical distance measuring device further comprises a control platform connected in communication with the testing machine, the control platform being configured to output a control instruction to the testing machine in response to user operation to control the testing machine to output the testing instruction.

8. The apparatus of claim 7, wherein the optical ranging device is a laser rangefinder. The testing device of the optical distance measuring device further comprises a temperature sensor connected in communication with the control platform, the temperature sensor being configured to collect temperature data of an ambient temperature of the testing device and transmit the temperature data to the control platform, the control platform being configured to perform temperature compensation on working parameters or calculation data of the optical distance measuring device and the light transmission device according to the temperature data.

9. The apparatus of claim 1, wherein, The optical distance measuring device is a chip or a module with optical distance measuring function, and the transmission light is laser light. 10.A method of testing an optical distance measuring device, applied to a testing apparatus of an optical distance measuring device, characterized in that, The testing device of the optical distance measuring device comprises a testing machine, a light emitting device, a receiving optical device, and a light transmission medium for forming optical path communication between the light emitting device and the receiving optical device; the length of the light transmission path is set according to the expected testing distance of the optical distance measuring device; The testing machine is in communication connection with the optical distance measuring device, and the testing method of the optical distance measuring device comprises the following steps: controlling the testing machine to output a testing instruction to the optical distance measuring device to control the optical distance measuring device to output an emission control instruction; controlling the light emitting device to output emission light in response to the emission control instruction so that the emission light is transmitted to the receiving optical device through the light transmission medium; controlling the receiving optical device to project the emission light to the optical distance measuring device so that the optical distance measuring device calculates the transmission distance of the emission light to obtain a testing distance and outputs the testing distance to the testing machine; and controlling the testing machine to perform result calculation according to the testing distance to obtain a testing result.

Images