Light-guide fiber type laser induction electronic target and induction method

Abstract

The invention relates to the technical field of laser electronic targets, in particular to a light-guide fiber type laser induction electronic target, which comprises a box body and a circuit board fixed in the box body, the circuit board comprises a photosensitive grating unit, a photoelectric conversion unit, a parallel-to-serial unit and a control unit; wherein the photosensitive grating unit comprises a plurality of light-guide fibers in the transverse direction and the longitudinal direction, the tail end of each light-guide fiber is connected to the photoelectric conversion unit, and the outputs of all the light-guide fibers in rows and columns form parallel inputs. The light-guide fibers replace infrared laser receiving tubes, the light-guide fibers are transversely and longitudinally arranged to form the photosensitive grating to replace a laser receiving tube array, the calculation precision of the drop point of the simulated shooting bullet can be remarkably improved, the production cost is greatly reduced, and therefore the overall performance and economical efficiency of a simulated shooting training system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser electronic targets, and in particular to an optical fiber type laser induction electronic target and an induction method. Background Art

[0002] In the field of light weapon simulated shooting training, accurate analysis of shooter movements is crucial to improving shooting performance. Traditional training methods rely on naked eye observation, which makes it difficult to accurately capture subtle deviations in shooter movements. To solve this problem, a laser light weapon simulated shooting training system came into being. The system uses a laser simulation gun to emit coded lasers to simulate bullet firing, laser-sensing electronic targets to decode and locate lasers, calculate the number of simulated bullet point locations, and the computer display analysis terminal displays the shooter's aiming trajectory, hit point and number of rings, etc., to achieve real-time monitoring and analysis of shooter movements.

[0003] The laser sensing electronic target is the core component of the system. It is composed of a dense photosensitive array of infrared laser receiving tubes welded on the circuit board. The laser irradiation position is detected by the change of the output signal. The row and column output signals are processed by the parallel-to-serial circuit, and the single-chip microcomputer analyzes and determines the laser spot position, and then calculates the landing point. The single-chip microcomputer transmits the data to the computer terminal through the wireless transmission module for display and analysis.

[0004] However, existing laser-sensing electronic targets have limitations: first, the accuracy of laser landing point calculation is limited to about one centimeter, which is difficult to improve further; second, the manufacturing hardware cost is high, especially the cost of infrared laser receiving tubes, which leads to a high cost of the entire system. These limitations affect its application in a wider range of fields, especially in large-scale weapon simulation shooting training.

[0005] Therefore, in order to further improve the applicability of the existing laser-induced electron target, we propose an optical fiber laser-induced electron target and an induction method. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art that the calculation accuracy of the laser landing point is limited to about one centimeter and is difficult to further improve, and to propose an optical fiber laser sensing electronic target and sensing method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] Design an optical fiber laser-induced electron target, including:

[0009] A box body and a circuit board fixed in the box body;

[0010] The circuit board includes a photosensitive grid unit, a photoelectric conversion unit, a parallel-to-serial conversion unit and a control unit;

[0011] The photosensitive grid unit includes a plurality of optical fibers along the transverse and longitudinal portions, the end of each optical fiber is connected to the photoelectric conversion unit, and the outputs of all rows and columns of optical fibers form parallel inputs and are connected to the input end of the parallel-to-serial unit;

[0012] The output end of the parallel-to-serial unit is connected to the input end of the control unit.

[0013] Furthermore, a sheath is provided on the outer side of the optical fiber, and an opening is formed in the sheath in a direction perpendicular to the circuit board and outwards and facing the shooter.

[0014] Furthermore, the sheath is an insulating member, and the angle of the opening is ninety degrees.

[0015] Furthermore, the circuit board also includes a voice circuit, a wireless communication module, an infrared remote control receiving module and a flash indication circuit connected to the output end of the control unit.

[0016] Furthermore, the box body includes a panel, a frame and a cover plate, and the panel and the cover plate are respectively fixed on two sides of the frame.

[0017] Furthermore, the panel is a PVC board, and a chest ring target pattern is also arranged on the panel.

[0018] In addition, the present invention also proposes a method for induction of an optical fiber laser-induced electron target, using the above-mentioned electron target, the method comprising the following steps:

[0019] Use a laser simulation gun to emit infrared coded laser to illuminate the photosensitive grid unit;

[0020] Determining the position of a laser spot on the photosensitive grid unit, wherein the laser spot covers at least one row and one column of optical fibers;

[0021] The laser is transmitted through the optical fiber, and the laser output is irradiated on the photoelectric conversion unit to generate a digital signal representing whether the optical fiber is covered by the laser spot;

[0022] Input the digital signal into the parallel-to-serial unit to convert it into a serial output signal;

[0023] The control unit processes the serial output signal to determine the rows and columns covered by the laser spot;

[0024] Calculate the center position of the laser spot to determine the aiming point of the laser simulation gun.

[0025] Furthermore, under the control of the control unit, the parallel-to-serial unit converts the parallel signal into a serial output signal, and reads it into the control unit as a binary data for processing, wherein each bit of the data corresponds to a row or column of the optical fiber, wherein:

[0026] The first digit represents the first row;

[0027] The second digit represents the second row: ......;

[0029] The Xth position represents the first column;

[0030] The X+1th position represents the second column; ......;

[0032] By judging whether the value of the binary data bit is "0" or "1", the rows and columns covered by the laser spot are determined. After the laser spot is irradiated on the photosensitive grid unit area, it will diffuse into a small circular area. By finding the starting row, ending row and starting column, and ending column where the data "0" is located, the upper, lower, left and right boundaries of the area where the laser spot is located are found. Through the boundary value, the center position of the laser spot is calculated, that is, the position of the aiming point of the laser simulation gun and the simulated bullet is obtained.

[0033] Furthermore, further including:

[0034] The corresponding position of the center of the laser landing point on the target surface is calculated through a formula to determine the shooting score.

[0035] Furthermore, the formula is:

[0036] X = LX0 + X1 * Lx;

[0037] Y=LY0+Y1*Ly; wherein X and Y represent the corresponding positions of the laser landing point on the target surface in the horizontal and vertical directions, respectively; LX0 and LY0 represent the distances of the first column and the first row of optical fibers relative to the boundary of the circuit board, respectively; X1 and Y1 represent the column and row numbers of the center of the laser landing point, respectively; and Lx and Ly represent the spacing between columns and rows of photosensitive grating units, respectively.

[0038] The optical fiber laser sensing electronic target and sensing method proposed in the present invention have the following beneficial effects:

[0039] Compared with the traditional infrared laser receiving tube array, the present invention uses an optical fiber with a diameter of about 1 mm, which can theoretically achieve a laser landing point calculation accuracy of 1 mm. In practical applications, by adjusting the arrangement density of the optical fiber, it is possible to achieve a much higher accuracy than traditional technology while ensuring the convenience of production and processing;

[0040] In addition, the cost of optical fiber is much lower than that of infrared laser receiving tubes. Depending on the thickness of the optical fiber and the outer packaging material, the price ranges from a few cents per meter to several yuan per meter, which is significantly lower than the cost of infrared laser receiving tubes. Taking the manufacture of a standard chest ring target as an example, the cost of the photosensitive array part of the infrared laser receiving tube is about 800 yuan, while the cost of using optical fiber is only about 70 yuan, which greatly reduces the cost.

[0041] The present invention can also be used for other types of laser electronic induction targets. Optical fibers replace infrared laser receiving tubes. The optical fibers are arranged horizontally and vertically to form photosensitive grids to replace laser receiving tube arrays. This can significantly improve the calculation accuracy of the impact point of simulated shooting bullets and greatly reduce production costs, thereby improving the overall performance and economy of the simulated shooting training system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the present invention;

[0043] Figure 2 It is a schematic diagram of the structure of the photosensitive grid unit of the present invention;

[0044] Figure 3 It is a schematic diagram of the structure of the optical fiber of the present invention;

[0045] Figure 4 It is a schematic diagram of the sheath structure of the present invention;

[0046] Figure 5 It is a schematic diagram of the structure of the photosensitive grid of the present invention;

[0047] Figure 6 It is a principle block diagram of the present invention;

[0048] Figure 7 A schematic diagram of infrared laser coding emitted by a simulated gun of the present invention;

[0049] Figure 8 It is the structural flow chart of the present invention;

[0050] Fig. 9 The single chip computer system and indicator light circuit diagram of the present invention;

[0051] Fig.10 The photoelectric conversion circuit of the present invention is a signal processing circuit diagram;

[0052] Fig.11 A signal processing circuit diagram of the photoelectric conversion circuit of the present invention;

[0053] Fig.12 A parallel signal to serial conversion circuit diagram of the present invention;

[0054] Fig.13The wireless communication and infrared remote control receiving circuit diagram of the present invention;

[0055] Fig.14 is a circuit diagram of a power supply circuit of the present invention;

[0056] Fig.15 It is the voice circuit diagram of the present invention.

[0057] In the figure: 1. box body; 11. panel; 12. frame; 13. cover plate; 14. chest ring target pattern; 2. circuit board; 21. photosensitive grid unit; 211. optical fiber; 212. sheath; 213. opening; 22. photoelectric conversion unit; 23. parallel to serial unit; 24. control unit; 25. voice circuit; 26. wireless communication module; 27. infrared remote control receiving module; 28. flash indication circuit. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0059] Reference Figure 1-15 An embodiment of the present invention discloses an optical fiber laser-sensing electronic target, which is used to solve the problems of limited calculation accuracy of laser landing points of current electronic targets and high manufacturing hardware costs. Specifically, the electronic target includes a box 1 and a circuit board 2 fixed in the box 1;

[0060] Reference Figure 1 , wherein the box body 1 of the present invention comprises a panel 11, a frame 12 and a cover plate 13, wherein the panel 11 and the cover plate 13 are respectively fixed on both sides of the frame 12, further, the panel 11 of the present invention is a PVC panel to ensure the transmittance of infrared laser, the PVC panel can isolate visible light, but can transmit infrared laser with a wavelength of 980nm, and the PVC panel is placed in front of the circuit board to isolate external light interference and ensure light transmittance, and secondly, a chest ring target pattern 14 is also provided on the panel 11, and the chest ring target pattern 14 is convenient for the shooter to aim, and its target ring image corresponds to the target ring on the circuit board 2, and the target ring is composed of a photosensitive grid unit 21;

[0061] Preferably, the frame 12 and the cover plate 13 in the present invention are made of metal, and a circular hole is opened on the top of the cover plate 13 to facilitate the extension of the antenna. The antenna is electrically connected to the circuit board 2 for signal transmission. The lower part of the cover plate 13 has a slot to facilitate the extension of the power cord. An external power cord and an antenna base are welded on the circuit board 2. The antenna is screwed on the base and extends out of the chassis from the hole on the cover plate 13 to facilitate wireless signal transmission. The external power cord extends from the slot at the bottom of the cover plate 13 to connect to the external battery box.

[0062] Reference Figure 2 The circuit board 2 includes a photosensitive grid unit 21, a photoelectric conversion unit 22, a parallel-to-serial unit 23 and a control unit 24. The control unit 24 in the present invention is preferably a single-chip microcomputer. Of course, the single-chip microcomputer should be equipped with embedded software, such as Figure 8 As shown, it is a circuit diagram of the single chip microcomputer described in the present invention;

[0063] The photosensitive grid unit 21 includes a plurality of optical fibers 211 along the transverse and longitudinal portions, and the end of each optical fiber 211 is connected to the photoelectric conversion unit 22. The outputs of the optical fibers 211 in all rows and columns form parallel inputs and are connected to the input end of the parallel-to-serial unit 23. Fig. 9 as well as Fig.10 As shown, Fig. 9 is a signal processing circuit diagram of a photoelectric conversion circuit according to the present invention, Fig.10 A signal processing circuit diagram of the photoelectric conversion circuit of the present invention;

[0064] The output end of the parallel-to-serial unit 23 is connected to the input end of the control unit 24. Specifically, the parallel-to-serial unit 23 is connected to the general input and output interface (GPIO) pin of the single-chip microcomputer. Fig.11 As shown, it is a parallel signal to serial circuit diagram of the present invention.

[0065] In some embodiments, the outer side of the optical fiber 211 of the present invention is covered with a sheath 212 , and the sheath 212 is provided with an opening 213 in a direction perpendicular to the circuit board 2 and outwards and facing the shooter.

[0066] In a more preferred embodiment, the sheath 212 of the present invention is an insulating member, preferably a black plastic member, and the angle of the opening 213 is ninety degrees.

[0067] like Figure 3 , 4As shown, specifically, in the present invention, the outside of the optical fiber 211 is wrapped with a sheath 212. Since the sheath 212 is not closed, but has a 90-degree opening 213 facing the shooter, part of the optical fiber 211 inside is exposed. In this way, when the external laser irradiates the optical fiber 211, the light can only be transmitted longitudinally along the optical fiber 211, and will not be transmitted horizontally to affect the adjacent optical fibers 211. At the same time, due to the existence of the sheath 212, it is also ensured that the rows and columns are cross-overlapped but not connected to each other.

[0068] Reference Figure 5 As shown, the grid parts described in the present invention are curved at intersection. Since the emitted infrared laser is irradiated at the curved place, it can enter the optical fiber and propagate along the length direction of the fiber. If it is irradiated vertically, the light path will not go along the fiber direction, but will only be reflected in the vertical direction.

[0069] Reference Figure 1 , Fig.13 , Fig.15 As shown, further, the circuit board 2 in the present invention also includes a voice circuit 25 connected to the output end of the control unit 24, a wireless communication module 26, an infrared remote control receiving module 27 and a flash indication circuit 28.

[0070] Specifically, in the present invention, the single-chip microcomputer and the wireless communication module 26 are connected by direct serial port connection. When power is turned on and initialized, the single-chip microcomputer sends a control signal to enter the configuration mode, and then sends control data through the serial port to set the communication channel, power, network ID, air rate and other parameters of the wireless communication module 26. After setting, the configuration mode is exited and the data transparent transmission mode is entered. At this time, the single-chip microcomputer sends the position information data of the laser landing point to the wireless communication module 26 through the serial port. After receiving the data, the wireless communication module 26 directly sends it out from the antenna. The wireless communication module 26 adopts the LORA spread spectrum method, which has a long transmission distance, fast speed, low power consumption, and supports air wake-up, wireless configuration, automatic relay, communication encryption and other functions.

[0071] In addition, the voice circuit 25 can output sound under the program control of the analog gun single-chip microcomputer, and is used to voice broadcast the ID number of the machine when the laser electronic target is powered on. The voice chip uses the WT588F02 chip, which is connected to the single-chip microcomputer through the serial port. It stores sound clips in the form of files arranged in sequence. The output end of the voice chip is connected to a speaker. When playing sound, the single-chip microcomputer sends the corresponding sound file number to the voice chip through the serial port, and the speaker can make a sound.

[0072] The flash indicator circuit 28 is used to indicate the light receiving state of the laser sensing target: after power-on, when there is no laser irradiation or the laser code is different from the code set in the target, the indicator light is long on; when there is laser irradiation with the correct code, the indicator light flashes quickly. The composition of the flash indicator circuit is relatively simple. It consists of a power supply, a light-emitting diode, a current-limiting resistor and the GPIO of the single-chip microcomputer. The circuit structure is a conventional method for technicians in the relevant field, and will not be described in detail here. The single-chip microcomputer controls the GPIO to output a low level, and the current is injected into the single-chip microcomputer through the power supply, the light-emitting diode, and the current-limiting resistor, and the diode is lit; when the single-chip microcomputer controls the GPIO to output a high level, the light-emitting diode goes out.

[0073] It should be noted that the infrared remote control receiving module 27 in the present invention is used to receive external infrared remote control signals, convert the infrared remote control signals into electronic pulse signals, and transmit them to the single-chip microcomputer, thereby realizing parameter settings of the electronic sensing target, such as group number, ID number, etc.

[0074] Specifically, the infrared laser emitted by the simulated gun is coded. The coded information includes the start bit, the stop bit and the ID number of the simulated gun. The coding format is as follows: Figure 7 As shown:

[0075] The figure shows two consecutive laser coded data frames. The first bit of each frame is the start bit, the last bit is the stop bit, and the ID number and function bit of the simulated gun are in the middle. The coding method is to modulate on a 38KHZ continuous wave. When the coding bit value is "1", the laser is emitted, and when the coding bit is "0", the laser is turned off, thus obtaining a time-serial coded laser sequence.

[0076] The single-chip microcomputer circuit of the laser sensing target decodes the infrared laser under program control and in strict timing. When the entire photosensitive grid area is irradiated by the laser, the value of the binary code bit is "0", and when it is not irradiated by the laser, the value of the code bit is "1". After receiving a complete data frame, a binary code data is obtained by parsing.

[0077] Through the above steps, the laser sensing target resolves the coded information of the infrared laser in time.

[0078] That is to say, the single chip microcomputer program in the present invention compares the parsed infrared laser coding information of the simulated gun with the ID number etc. pre-stored in the program. If the parsed value is the same as the pre-stored value, the laser landing point position is sent to the display terminal through the wireless communication module 26, which is used to display the aiming trajectory and bullet landing point of the simulated gun on the display screen of the terminal.

[0079] Reference Figure 8In addition, the present invention also proposes a method for induction of an optical fiber laser-induced electron target, the method using the above-mentioned electron target, and the specific method comprises the following steps:

[0080] Use a laser simulation gun to emit infrared coded laser to illuminate the photosensitive grid unit 21;

[0081] Determine the position of the laser spot on the photosensitive grid unit 21, wherein the laser spot covers at least one row and one column of optical fibers 211;

[0082] The laser is transmitted through the optical fiber 211, and the laser output is irradiated on the photoelectric conversion unit 22, generating a digital signal representing whether the optical fiber 211 is covered by the laser spot;

[0083] The digital signal is input into the parallel-to-serial unit 23 to be converted into a serial output signal;

[0084] The control unit 24 processes the serial output signal to determine the rows and columns covered by the laser spot;

[0085] Calculate the center position of the laser spot to determine the aiming point of the laser simulation gun.

[0086] In some embodiments, the parallel-to-serial unit 23 of the present invention, under the control of the control unit 24, converts the parallel signal into a serial output signal, and reads it into the control unit 24 as a binary data for processing, wherein each bit of the data corresponds to a row or column of the optical fiber 211, wherein:

[0087] The first digit represents the first row;

[0088] The second digit represents the second row: ......;

[0090] The Xth position represents the first column;

[0091] The X+1th position represents the second column; ......;

[0093] By judging whether the value of the binary data bit is "0" or "1", the rows and columns covered by the laser spot are judged. After the laser spot is irradiated on the photosensitive grid unit 21 area, it will diffuse into a small circular area. By finding the starting row, ending row and starting column, ending column where the data "0" is located, the upper, lower, left and right boundaries of the area where the laser spot is located are found. Through the boundary value, the center position of the laser spot is calculated, that is, the position of the aiming point of the laser simulation gun and the simulated bullet is obtained.

[0094] Generally, the laser spot will cover two or three rows and two or three columns. The coverage area will vary according to the density of the optical fiber 211. The greater the density, the more rows and columns are covered. For example, the laser spot falls on the 3rd, 4th, and 5th rows and the 7th, 8th, and 9th columns. The data read by the microcontroller is:

[0095] 1(row 1) 1 0(row 3) 0 0(row 5) 1 1 1 1 1

[0096] ...1(1st column)1 1 1 1 1 1 0(7th column)0 0(9th column)1..

[0097] For example, in the above example, the calculation process of the laser landing point array is:

[0098] (3+4+5) / 3=4;

[0099] (7+8+9) / 3=8.

[0100] The center value of the laser landing point is: row 4, column 8.

[0101] On the basis of the above embodiments, the present invention further includes:

[0102] The corresponding position of the center of the laser landing point on the target surface is calculated through a formula to determine the shooting score.

[0103] Specifically, the formula is:

[0104] X = LX0 + X1 * Lx;

[0105] Y=LY0+Y1*Ly; wherein X and Y represent the corresponding positions of the laser landing point on the target surface in the horizontal and vertical directions, respectively; LX0 and LY0 represent the distances of the first column and the first row of optical fibers 211 relative to the boundary of the circuit board 2, respectively; X1 and Y1 represent the serial numbers of the column and row where the center of the laser landing point is located, respectively; and Lx and Ly represent the spacing between columns and rows of the photosensitive grating units 21, respectively.

[0106] Through the above steps, the laser sensing target spatially resolves the landing position of the laser spot.

[0107] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An optical fiber laser-induced electron target, characterized in that: include: A box (1) and a circuit board (2) fixed in the box (1); The circuit board (2) comprises a photosensitive grid unit (21), a photoelectric conversion unit (22), a parallel-to-serial conversion unit (23) and a control unit (24); The photosensitive grid unit (21) comprises a plurality of optical fibers (211) along the transverse and longitudinal portions, the end of each optical fiber (211) is connected to the photoelectric conversion unit (22), and the outputs of all rows and columns of optical fibers (211) form parallel inputs and are connected to the input end of the parallel-to-serial unit (23); The output end of the parallel-to-serial unit (23) is connected to the input end of the control unit (24).

2. The electron target according to claim 1, characterized in that: The outer side of the optical fiber (211) is provided with a sheath (212), and the sheath (212) is provided with an opening (213) in a direction perpendicular to the circuit board (2) and outwards and facing the shooter.

3. The electron target according to claim 2, characterized in that: The sheath (212) is an insulating member, and the angle of the opening (213) is ninety degrees.

4. The electron target according to claim 1, characterized in that: The circuit board (2) further comprises a voice circuit (25) connected to the output end of the control unit (24), a wireless communication module (26), an infrared remote control receiving module (27) and a flash indication circuit (28).

5. The electron target according to any one of claims 1 to 4, characterized in that: The box body (1) comprises a panel (11), a frame (12) and a cover plate (13); the panel (11) and the cover plate (13) are respectively fixed on two sides of the frame (12).

6. The electron target according to claim 5, characterized in that: The panel (11) is a PVC board, and a chest ring target pattern (14) is also provided on the panel (11).

7. A method for induction of an optical fiber laser-induced electron target, using the electron target as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: Using a laser simulation gun to emit infrared coded laser light to illuminate the photosensitive grid unit (21); Determining the position of a laser spot on a photosensitive grid unit (21), wherein the laser spot covers at least one row and one column of optical fibers (211); The laser light is transmitted through the optical fiber (211), and the laser light output is irradiated on the photoelectric conversion unit (22), thereby generating a digital signal representing whether the optical fiber (211) is covered by the laser light spot; Inputting the digital signal into a parallel-to-serial unit (23) to convert it into a serial output signal; Processing the serial output signal through a control unit (24) to determine the rows and columns covered by the laser spot; Calculate the center position of the laser spot to determine the aiming point of the laser simulation gun.

8. The method according to claim 7, characterized in that: The parallel-to-serial unit (23) converts the parallel signal into a serial output signal under the control of the control unit (24), and reads the serial output signal into the control unit (24) as a binary data for processing, wherein each bit of the data corresponds to a row or column of the optical fiber (211), wherein: The first digit represents the first row; The second digit represents the second row: ......； The Xth position represents the first column; The X+1th position represents the second column; ......； By judging whether the value of the binary data bit is "0" or "1", the row and column covered by the laser spot are judged. After the laser spot is irradiated on the photosensitive grid unit (21), it will spread into a small circular area. By finding the starting row and ending row and the starting column and ending column where the data "0" is located, the upper, lower, left and right boundaries of the area where the laser spot is located are found. Through the boundary values, the center position of the laser spot is calculated, that is, the position of the aiming point of the laser simulated gun and the position of the simulated bullet are obtained.

9. The method according to claim 8, characterized in that: Further including: The corresponding position of the center of the laser landing point on the target surface is calculated through a formula to determine the shooting score.

10. The method according to claim 9, characterized in that: The formula is: X = LX0 + X1 * Lx; Y=LY0+Y1*Ly; wherein X and Y represent the corresponding positions of the laser landing point on the target surface in the horizontal and vertical directions, respectively; LX0 and LY0 represent the distances of the first column and the first row of optical fibers (211) relative to the border of the circuit board (2), respectively; X1 and Y1 represent the serial numbers of the column and row where the center of the laser landing point is located, respectively; and Lx and Ly represent the spacing between columns and between rows of the photosensitive grid unit (21), respectively.

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