A test system and method for photomultiplier tube trigger stability

Abstract

The application provides a kind of photoelectric pair tube trigger stability test system, support seat I and support seat II are respectively installed on the emitting tube and receiving tube;Mounting seat is arranged between support seat I and support seat II, incremental encoder is installed thereon, shielding component is installed on the working shaft of incremental encoder;Oscilloscope is connected with incremental encoder and receiving tube;Rotary shielding component, incremental encoder sends square wave signal, receiving tube sends pulse signal;Record the number / number interval of the rising edge of square wave signal closest to the rising edge of pulse signal;Repeat test, compare the consistency of number / number interval to determine whether photoelectric pair tube trigger stability is qualified;The system can effectively detect the stability of photoelectric pair tube trigger, and then assist staff to screen out qualified devices meeting the requirements, suitable for quality evaluation of various types of photoelectric pair tube.

Description

Technical Field

[0001] This invention relates to the field of performance testing, and specifically to a testing system and method for the triggering stability of a photoelectric pair. Background Technology

[0002] In existing intelligent detection systems, photoelectric pairs are installed on the production line. The emitting tube emits infrared light, and the receiving tube receives the infrared light to detect the arrival of a target object. When the target object blocks the light, the light is blocked, and the receiving end of the photoelectric pair generates a pulse signal. This pulse signal serves as the system's start-up signal (trigger signal), and the internal instruments of the system begin to work. Therefore, the stability of the pulse signal directly affects the start-up time of subsequent instruments.

[0003] The quality of photoelectric pairs on the market varies greatly. Photoelectric pairs with low triggering accuracy often exhibit trigger jitter, such as... Figure 2 As shown, the effective trigger position of the photoelectric pair will fluctuate within a certain range. Furthermore, as the distance between the transmitting and receiving tubes increases, such as... Figure 3 As shown, the light spot (the diameter of the infrared light) will gradually spread, the area of ​​the jittering zone will also increase, and the jittering phenomenon will become more obvious.

[0004] Trigger jitter can cause the pulse signal to be emitted at inconsistent times, leading to the instrument turning on prematurely or delayed, thus affecting the effective detection of the target object. For example: Figure 1 As shown, in an automotive vision inspection production line, photoelectric sensors are installed in the inspection area. A batch of car bodies are sequentially placed onto the conveyor line. When the first car body enters the inspection area, the body blocks the infrared light, and the receiving tube emits a pulse signal. The photoelectric sensor emits the pulse signal at the 5th second (starting from when the car body is placed on the conveyor line), and the camera begins to take a picture. When the second car body arrives, the photoelectric sensor emits the pulse signal at the 4.5th second (starting from when the car body is placed on the conveyor line), and the camera begins to take a picture. The same applies to the third car body; the photoelectric sensor emits the pulse signal at the 5.5th second (starting from when the car body is placed on the conveyor line), and the camera begins to take a picture… This results in different camera capture times for different car bodies, leading to inconsistent image areas and affecting the detection accuracy of subsequent image detection algorithms. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a testing system and method for the triggering stability of photoelectric pairs. This system effectively detects the triggering stability of photoelectric pairs, thereby assisting personnel in selecting qualified devices that meet the requirements. It solves the technical problems of system instability and reduced accuracy caused by pulse signal jitter. It is easy to implement, convenient, and accurate, and is suitable for quality evaluation of various types of photoelectric pairs.

[0006] The technical solution is as follows:

[0007] A test system for the triggering stability of a photoelectric pair, wherein the photoelectric pair to be tested includes a transmitter and a receiver;

[0008] The testing system includes support base I and support base II, incremental encoder, mounting base, shielding components and oscilloscope;

[0009] During testing, support base I and support base II are set on the left and right sides, respectively, with the transmitting tube and receiving tube installed on them. The two are positioned opposite each other, and the receiving tube can receive the light emitted by the transmitting tube.

[0010] The mounting base is positioned between support base I and support base II, and the three are arranged in a triangle. An incremental encoder is mounted on the mounting base, and a blocking component is mounted on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it will not block the light emitted by the transmitting tube. When the blocking component rotates, it can block the light emitted by the transmitting tube, causing the receiving tube to generate a pulse signal.

[0011] The oscilloscope is connected to the incremental encoder and the receiving tube respectively, and is used to receive the waveform signals generated by the two.

[0012] During testing, the rotating blocking component causes the incremental encoder to emit continuous square wave signals, which are received by the oscilloscope. Each rising edge of the square wave signal is numbered according to the timing. As the blocking component rotates, it can block the light. When blocking, the receiving tube emits a pulse signal, which is received by the oscilloscope. The number / numbering interval of the rising edge of the square wave signal that is closest to the receiving time of the pulse signal is recorded. The blocking component is then returned to its initial position, and the oscilloscope is zeroed.

[0013] Repeat the test and record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times; compare the consistency of the number / interval. If the consistency meets the requirements, the triggering stability of the photoelectric pair under test is qualified; otherwise, it is unqualified.

[0014] Preferably, the mounting base is provided with a slide table and a slide rail below it. The mounting base is mounted on the slide table, and the two slide together on the slide rail to change the distance between the shielding component and the receiving tube.

[0015] After the mounting base is slid to the designated position, keep the mounting base in the same position and repeat the test at that position. Record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times. Compare the consistency of the number / interval. If the consistency does not meet the requirements, the triggering stability of the photoelectric pair to be tested is unqualified.

[0016] If the consistency requirement is met, the mounting base continues to slide to other specified positions, and then the position of the mounting base remains unchanged. The test is repeated at that position, and the consistency of the number / number range is compared.

[0017] The triggering stability of the photoelectric pair under test is qualified only when the consistency requirements are met at each specified location.

[0018] Furthermore, the blocking component is a blocking rod, a blocking block, or a blocking plate.

[0019] Preferably, the distance between the support base I and the support base II is set according to the distance between the transmitting tube and the receiving tube in actual application.

[0020] Furthermore, a blocking component is installed on the working shaft of the incremental encoder, and the two rotate synchronously, in the following two ways:

[0021] Method 1: A blocking component is fixedly installed on the working shaft of the incremental encoder, and the blocking component is rotated manually;

[0022] Method 2: A blocking component and a coupling are fixedly installed on the working shaft of the incremental encoder. The coupling is connected to the motor rotor, and the blocking component is installed on the motor rotor. The blocking component rotates synchronously with the working shaft of the incremental encoder under the drive of the motor.

[0023] This invention also discloses a method for testing the triggering stability of a photoelectric pair, comprising the following steps:

[0024] ① The transmitting tube and receiving tube of the photoelectric pair to be tested are installed on support base I and support base II respectively. The receiving tube can receive the light emitted by the transmitting tube, and the relative positions of the two remain unchanged.

[0025] The mounting base is positioned between support base I and support base II, forming a triangular arrangement. An incremental encoder is mounted on the mounting base, and a blocking component is mounted on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it does not block the light emitted by the transmitting tube. When the blocking component rotates, it blocks the light emitted by the transmitting tube, causing the receiving tube to generate a pulse signal.

[0026] The oscilloscope is connected to the incremental encoder and the receiving tube respectively, and is used to receive the waveform signals generated by both.

[0027] ② When the blocking component is rotated, the encoder emits a continuous square wave signal, which is received by the oscilloscope. Each rising edge of the square wave signal is numbered according to the timing. As the blocking component rotates, it can block the light. When blocking, the receiving tube emits a pulse signal, which is received by the oscilloscope.

[0028] Record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal; return the obstructing component to its initial position and zero the oscilloscope;

[0029] ③ Repeat step ② multiple times and compare the consistency of the recorded numbers / number ranges. If the consistency meets the requirements, the photoelectric pair to be tested is qualified; otherwise, it is unqualified.

[0030] Furthermore, following step ③, the following steps are also included:

[0031] ④ If the judgment result in step ③ is qualified, move the mounting base to another designated position, keep the mounting base in the same position, and repeat steps ② to ③.

[0032] If the judgment result in step ③ is unqualified, then the photoelectric pair to be tested is unqualified, and proceed directly to step ⑥.

[0033] ⑤ Determine if there are any untested designated locations. If so, repeat step ④. If not, determine if the results at different designated locations are all qualified. If yes, the photoelectric pair to be tested is qualified. If no, it is unqualified.

[0034] ⑥ Test ends.

[0035] Preferably, in step ③, step ② is repeated 1 to 2 times; and each specified position is set at equal intervals.

[0036] Preferably, the consistency of the recorded numbers is compared by calculating the variance of the multiple number values. If the variance is less than a threshold, the consistency requirement is met; otherwise, it is not.

[0037] Preferably, the mounting base, support base I, and support base II are all placed on a horizontal surface, and the initial position of the shielding component is: the shielding component hangs naturally to the horizontal surface, and when the shielding component is rotated upward, it can block the light emitted by the emitting tube.

[0038] The system and method of this invention have the following characteristics:

[0039] By utilizing an incremental encoder, a blocking component, and an oscilloscope in conjunction, waveforms corresponding to the output signals of the incremental encoder and the receiving tube are simultaneously acquired, and a correspondence between them is established. By rotating and swinging the blocking component, the light is repeatedly blocked, and the correspondence between multiple pulse signals and square wave numbers is obtained. If most pulse signals correspond to the same number / number range, it indicates that the positional jitter of the phototransistor is small each time it is triggered, and the pulse signal emission time is relatively consistent, indicating that the stability of the phototransistor meets the standard. Conversely, if most pulse signals correspond to different numbers / number ranges, it indicates that the positional jitter of the phototransistor is large each time it is triggered, and the pulse signal emission time is inconsistent, indicating that the stability of the phototransistor does not meet the standard. Based on this principle, this invention designs and develops a testing system and method. The design is ingenious and easy to implement, effectively assisting personnel in equipment selection and ensuring the stability of pulse signals. Attached Figure Description

[0040] Figure 1 A schematic diagram of installing photoelectric pairs on an automotive vision inspection production line;

[0041] Figure 2 This is a schematic diagram of the effective trigger position jitter range of the photoelectric pair.

[0042] Figure 3 This is a schematic diagram showing how the jitter range becomes more pronounced with increasing distance.

[0043] Figure 4 This is a schematic diagram of one implementation method of the testing system;

[0044] Figure 5 This is a schematic diagram illustrating another implementation of the testing system;

[0045] Figure 6 This is a schematic diagram showing the correspondence between the rising edge of a pulse signal and the rising edge of a square wave signal. Detailed Implementation

[0046] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] A testing system for the triggering stability of a photoelectric pair, such as... Figure 4 As shown, the photoelectric pair to be tested includes a transmitter tube 11 and a receiver tube 12;

[0048] The testing system includes support base I1 and support base II 2, incremental encoder 3, mounting base 4, shielding component 5, and oscilloscope 6;

[0049] During testing, support base I1 and support base II 2 are set on the left and right sides, respectively, with transmitting tube 11 and receiving tube 12 installed on them. The two are positioned opposite each other, and the receiving tube can receive the light emitted by the transmitting tube.

[0050] Mounting base 4 is positioned between support base I and support base II, forming a triangular arrangement. Incremental encoder 3 is mounted on mounting base 4, and blocking component 5 is mounted on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it will not block the light emitted by the transmitting tube. When the blocking component rotates, it can block the light emitted by the transmitting tube, causing the receiving tube to generate a pulse signal.

[0051] The oscilloscope 6 is connected to the incremental encoder and the receiving tube respectively, and is used to receive the waveform signals generated by both.

[0052] During testing, the rotating blocking component 5 causes the incremental encoder 3 to emit continuous square wave signals, which are received by the oscilloscope 6. Each rising edge of the square wave signal is numbered according to the timing. As the blocking component rotates, it can block the light. When blocking, the receiving tube emits a pulse signal, which is received by the oscilloscope. The number / number interval of the rising edge of the square wave signal that is closest to the receiving time of the pulse signal is recorded. The blocking component 5 is then returned to its initial position, and the oscilloscope 6 is reset to zero.

[0053] Repeat the test and record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times; compare the consistency of the number / interval. If the consistency meets the requirements, the triggering stability of the photoelectric pair under test is qualified; otherwise, it is unqualified.

[0054] like Figure 6 The results of one of the tests are shown. It can be seen that the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal is numbered 101 / the numbering range is 101 to 102.

[0055] Repeat the test and record the number / number range of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times;

[0056] For example, in case 1: if 100 numbers are recorded, and more than 90 of them are 101, with only a few numbers being other values, then the consistency requirement is met and the photoelectric pair is qualified.

[0057] Scenario 2: 100 numberings were recorded. If more than 95 of the numberings are between 100 and 103, then the consistency requirement is considered met and the photoelectric pair is qualified.

[0058] Scenario 3: 100 numbering intervals were recorded. If more than 92 numbering intervals were all 101 to 102, then the consistency requirement was considered met and the photoelectric pair was qualified.

[0059] Scenario 4: 100 numbering intervals were recorded. If more than 85 numbering intervals are between 100 and 103, then the consistency requirement is considered met and the photoelectric pair is qualified.

[0060] In practice, it is necessary to design reasonable evaluation indicators based on the stability requirements of the trigger signal emitted by the photoelectric pair in the actual application process, and verify the consistency of the test results.

[0061] To further verify the stability of the photoelectric pair, the mounting base can be moved to different locations for testing. Specifically:

[0062] The mounting base is provided with a slide table 7 and a slide rail 8 below it. The mounting base is installed on the slide table 7, and the two slide together on the slide rail to change the distance between the shielding component and the receiving tube.

[0063] After the mounting base 4 is slid to the designated position, keep the mounting base in the same position and repeat the test at that position. Record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times. Compare the consistency of the number / interval. If the consistency does not meet the requirements, the triggering stability of the photoelectric pair to be tested is unqualified.

[0064] If the consistency requirement is met, the mounting base continues to slide to other specified positions, and then the position of the mounting base remains unchanged. The test is repeated at that position, and the consistency of the number / number range is compared.

[0065] The triggering stability of the photoelectric pair under test is qualified only when the consistency requirements are met at each specified location.

[0066] In practice, the designated positions can be set at equal intervals. For example, the distance between the transmitting tube 11 and the receiving tube 12 is 2 meters, and four designated positions are set at equal intervals, with a distance of 0.5 meters between any two adjacent designated positions. The distance between support base I1 and support base II2 is preferably set according to the actual distance between the transmitting tube and the receiving tube in practical applications.

[0067] In practice, the shielding component 5 is a shielding rod, shielding block, or shielding plate.

[0068] More specifically, a blocking component 5 is installed on the working shaft of the incremental encoder 3, and the two rotate synchronously, in the following two ways:

[0069] Method 1: A blocking component is fixedly installed on the working shaft of the incremental encoder, and the blocking component is rotated manually;

[0070] For ease of understanding, the following is a description of incremental encoders in the prior art:

[0071] Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses. The number of pulses represents the magnitude of the displacement. As the encoder shaft rotates, corresponding pulses are output, and the number of pulses is determined by the number of lines in the encoder grating. Once an incremental encoder is selected, the number of lines in the grating is a fixed value. Therefore, as long as the initial position of the blocking component remains unchanged, the number of square wave signals output by the incremental encoder is consistent each time the blocking component rotates from its initial position to the position where it blocks the light. In other words, the number of square wave signals depends only on the rotation angle / position of the blocking component and does not change with the rotational speed of the blocking component.

[0072] Therefore, in this method, the speed of manually rotating the shielding component does not affect the test accuracy.

[0073] Method 2: For example Figure 5 As shown, a blocking component and a coupling 31 are fixedly installed on the working shaft of the incremental encoder. The coupling is connected to the motor rotor, and the blocking component is installed on the motor rotor. The blocking component rotates synchronously with the working shaft of the incremental encoder under the drive of the motor.

[0074] This method uses automatic rotation, making it more convenient.

[0075] As an application of the above-mentioned testing system, this embodiment discloses a method for testing the triggering stability of a photoelectric pair, including the following steps:

[0076] ① The transmitting tube 11 and receiving tube 12 of the photoelectric pair to be tested are respectively mounted on support I1 and support II2. The receiving tube can receive the light emitted by the transmitting tube, and the relative positions of the two remain unchanged.

[0077] Mounting base 4 is positioned between support base I and support base II, forming a triangular arrangement. Incremental encoder 3 is mounted on the mounting base, and blocking component 5 is mounted on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it will not block the light emitted by the transmitting tube. When the blocking component rotates, it can block the light emitted by the transmitting tube, causing the receiving tube to generate a pulse signal.

[0078] The oscilloscope 6 is connected to the incremental encoder 3 and the receiving tube 12 respectively, and is used to receive the waveform signals generated by both.

[0079] ② Rotate the blocking component 5, the encoder emits a continuous square wave signal, which is received by the oscilloscope, and each rising edge of the square wave signal is numbered according to the timing; as the blocking component rotates, it can block the light, and when blocking, the receiving tube emits a pulse signal which is received by the oscilloscope.

[0080] Record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal; return the obstructing component to its initial position and zero the oscilloscope;

[0081] ③ Repeat step ② multiple times and compare the consistency of the recorded numbers / number ranges. If the consistency meets the requirements, the photoelectric pair to be tested is qualified; otherwise, it is unqualified.

[0082] To further verify stability, as a preferred testing method, after step ③, the following steps are also included:

[0083] ④ If the judgment result in step ③ is qualified, move the mounting base to another designated position, keep the mounting base in the same position, and repeat steps ② to ③.

[0084] If the judgment result in step ③ is unqualified, then the photoelectric pair to be tested is unqualified, and proceed directly to step ⑥.

[0085] ⑤ Determine if there are any untested designated locations. If so, repeat step ④. If not, determine if the results at different designated locations are all qualified. If yes, the photoelectric pair to be tested is qualified. If no, it is unqualified.

[0086] ⑥ Test ends.

[0087] In step ③, step ② is repeated 10 to 100 times; each specified position is set at equal intervals. The consistency of the recorded numbers is compared by calculating the variance of multiple number values. If the variance is less than a threshold, the consistency requirement is met; otherwise, it is not.

[0088] For ease of implementation, this embodiment discloses a simple distribution method:

[0089] Mounting base 4, support base I1, and support base II2 are all placed on a horizontal surface. The starting position of the shielding component 5 is: the shielding component hangs naturally to the horizontal surface. When the shielding component 5 is rotated upward, it can block the light emitted by the emitting tube.

[0090] In practice, there is no specific limitation on the exact position to which the blocking component should rotate. It can rotate between support I1 and support II2 to continuously block the light between the phototransistors, or it can rotate from bottom to top, passing through the light between the phototransistors and cutting the light. It is sufficient that the blocking component can trigger the phototransistors to generate a pulse signal. When judging stability, only the position of the rising edge is observed; the falling edge is not considered.

[0091] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; obviously, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is intended to be defined by the appended claims and their equivalents.

Claims

1. A test system for the triggering stability of a photoelectric pair, wherein the photoelectric pair to be tested includes a transmitting tube (11) and a receiving tube (12); characterized in that The testing system includes support base I (1) and support base II (2), incremental encoder (3), mounting base (4), shielding component (5) and oscilloscope (6); During testing, support base I (1) and support base II (2) are set on the left and right sides, respectively, and transmitting tube (11) and receiving tube (12) are installed on them. The two are positioned opposite each other, and the receiving tube can receive the light emitted by the transmitting tube. The mounting base (4) is located between support base I and support base II, and the three are arranged in a triangle. An incremental encoder (3) is installed on the mounting base (4), and a blocking component (5) is installed on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it will not block the light emitted by the transmitting tube. When the blocking component rotates, it can block the light emitted by the transmitting tube, so that the receiving tube generates a pulse signal. The oscilloscope (6) is connected to the incremental encoder and the receiving tube respectively, and is used to receive the waveform signals generated by the two. During testing, the rotating shielding component (5) emits a continuous square wave signal from the incremental encoder (3), which is received by the oscilloscope (6). Each rising edge of the square wave signal is numbered according to the timing. As the shielding component rotates, it can block the light. When blocking, the receiving tube emits a pulse signal, which is received by the oscilloscope. The number / numbering interval of the rising edge of the square wave signal that is closest to the receiving time of the pulse signal is recorded. The shielding component (5) is returned to the starting position, and the oscilloscope (6) is zeroed. Repeat the test and record the number / interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times; compare the consistency of the number / interval. If the consistency meets the requirements, the triggering stability of the photoelectric pair under test is qualified; otherwise, it is unqualified.

2. The system for testing the stability of the triggering of the photomultiplier tube according to claim 1, wherein: The mounting base is provided with a slide table (7) and a slide rail (8) below it. The mounting base is installed on the slide table (7), and the two slide together on the slide rail to change the distance between the shielding component and the receiving tube. After the mounting base (4) is slid to the designated position, keep the mounting base position unchanged and repeat the test at this position. Record the number / number interval of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal multiple times. Compare the consistency of the number / number interval. If the consistency does not meet the requirements, the triggering stability of the photoelectric pair to be tested is unqualified. If the consistency requirement is met, the mounting base continues to slide to other specified positions, and then the position of the mounting base remains unchanged. The test is repeated at that position, and the consistency of the number / number range is compared. The triggering stability of the photoelectric pair under test is qualified only when the consistency requirements are met at each specified location.

3. The system for testing the stability of the triggering of a photomultiplier tube according to claim 1 or 2, characterized in that: The shielding component (5) is a shielding rod, a shielding block, or a shielding plate.

4. The system for testing the stability of the triggering of the photomultiplier tube according to claim 1 or 2, wherein: The distance between the support base I (1) and the support base II (2) is set according to the distance between the transmitting tube and the receiving tube in actual application.

5. The system for testing the stability of the triggering of the photomultiplier tube according to claim 1 or 2, wherein: The incremental encoder (3) has a blocking component (5) mounted on its working shaft. The two rotate synchronously, and the method includes the following two: Method 1: A blocking component is fixedly installed on the working shaft of the incremental encoder, and the blocking component is rotated manually; Method 2: A shielding component and a coupling (31) are fixedly installed on the working shaft of the incremental encoder. The coupling is connected to the motor rotor. The shielding component is installed on the motor rotor. The shielding component rotates synchronously with the working shaft of the incremental encoder under the drive of the motor.

6. A method for testing the triggering stability of a photoelectric pair, characterized in that, Includes the following steps: ① The transmitting tube (11) and receiving tube (12) of the photoelectric pair to be tested are respectively installed on support I (1) and support II (2). The receiving tube can receive the light emitted by the transmitting tube and keep their relative positions unchanged. The mounting base (4) is set between the support base I and the support base II, and the three are arranged in a triangle. An incremental encoder (3) is installed on the mounting base, and a blocking component (5) is installed on the working shaft of the incremental encoder. The two rotate synchronously. When the blocking component is in the initial position, it will not block the light emitted by the transmitting tube. When the blocking component rotates, it can block the light emitted by the transmitting tube, so that the receiving tube generates a pulse signal. The oscilloscope (6) is connected to the incremental encoder (3) and the receiving tube (12) respectively, and is used to receive the waveform signals generated by the two. ② Rotate the blocking component (5), the encoder emits a continuous square wave signal, which is received by the oscilloscope, and each rising edge of the square wave signal is numbered according to the timing; as the blocking component rotates, it can block the light, and when blocking, the receiving tube emits a pulse signal which is received by the oscilloscope. Record the number / number range of the rising edge of the square wave signal that is closest to the receiving time of the rising edge of the pulse signal; Return the obstructing component to its initial position and zero the oscilloscope. ③ Repeat step ② multiple times and compare the consistency of the recorded numbers / number ranges. If the consistency meets the requirements, the photoelectric pair to be tested is qualified; otherwise, it is unqualified.

7. The test method of claim 6, wherein: Following step ③, the following steps are also included: ④ If the judgment result in step ③ is qualified, move the mounting base to another designated position, keep the mounting base in that position, and repeat steps ② to ③. If the judgment result in step ③ is unqualified, then the photoelectric pair to be tested is unqualified, and proceed directly to step ⑥. ⑤ Determine if there are any untested designated locations. If so, repeat step ④. If not, determine if the results at different designated locations are all qualified. If yes, the photoelectric pair to be tested is qualified. If no, it is unqualified. ⑥ Test ends.

8. The test method of claim 6, wherein: In step ③, repeat step ② 10 to 100 times; set equal intervals at each specified position.

9. The test method of claim 6, wherein: To compare the consistency of the recorded numbers, the method is to calculate the variance of the multiple number values. If the variance is less than a threshold, the consistency requirement is met; otherwise, it is not.

10. The test method of claim 6, wherein: The mounting base (4), support base I (1), and support base II (2) are all placed on a horizontal surface. The starting position of the shielding component (5) is: the shielding component hangs down naturally to the horizontal surface. When the shielding component (5) is rotated upward, it can block the light emitted by the emitting tube.

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