Receiving and transmitting integrated multi-inclined-curtain integrated photoelectric speed measurement device, calibration method and speed measurement method

Abstract

The invention relates to a receiving and transmitting integrated multi-inclined-curtain integrated photoelectric speed measurement device, a calibration method and a speed measurement method. The device comprises a high-power optical fiber laser light source, a photoelectric detector and a signal processing circuit which are arranged in a box body, a Fresnel lens arranged on the box body, a plurality of obliquely mounted light beam converters and slit diaphragms arranged on the light beam converters, and the high-power fiber laser light source is arranged below the Fresnel lens. The calibration method comprises the steps of determining the ballistic height, adjusting the inclination angle of the laser light curtain, determining the target distance and calculating the light curtain distance. The test method comprises the steps of obtaining calibrated parameters, obtaining a time value, calculating a time interval, and calculating the flight speed of the projectile. According to the invention, speed measurement errors caused by angle deviation are effectively reduced; the problems of path deviation and inaccurate time difference calculation caused by angle errors are reduced; the device has good portability and flexibility, reduces the dependence on manual calibration, and improves the measurement precision and efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of weapon exterior ballistic parameter test and measurement, and specifically relates to a transceiver-integrated multi-tilt screen integrated photoelectric speed measuring device, a calibration method and a speed measuring method. Background Art

[0002] In a highly maneuverable environment (such as an aircraft, ship, or high-speed land platform), it is of great significance to measure the speed of a projectile in real time. However, the two main speed measurement methods in the prior art - sky target speed measurement and light curtain target speed measurement - have obvious limitations and are difficult to meet the needs of real-time speed measurement on a mobile carrier.

[0003] The sky target speed measurement system relies on natural light sources and manual calibration, which significantly affects its sensitivity in changing weather conditions or night tests. The system must be strictly aligned with the trajectory line and installed below the trajectory line. The traditional all-weather sky target speed measurement system has large errors. The main reasons are: 1. The traditional measurement method is arranged on-site, in which the light curtains generated by the two devices of the measuring equipment need to be strictly parallel, so there are errors in position adjustment; 2. The error between the position adjustment of the devices in the measuring system; 3. During use, the light curtains generated by the two devices in the measuring system need to be parallel to each other and perpendicular to the horizontal plane. 4. The error caused by the distance measurement between the two devices in the measuring system.

[0004] For example, Chinese patent CN102944698B discloses a traditional sky target speed measurement method. Although it can achieve speed measurement in a daytime environment, its equipment is large in size and heavy in weight, lacks portability, and has strict layout requirements. The sky target needs to be aligned with the ballistic line, and the light curtain target must be perpendicular to the ballistic line. The installation process is complicated and restricted by the environment, and the flexibility is poor. It is not suitable for use in high-mobility scenarios. In order to solve the problem that the sky target cannot be used at night, existing technologies such as Chinese patent CN101943549B propose an all-weather sky target equipped with an active light source. Although this device solves the limitations of nighttime testing, its size and weight are similar to those of traditional sky targets. The layout is still complicated and highly dependent on manual calibration. There is a large risk of error, which affects the accuracy and efficiency of the measurement. Therefore, this type of equipment is still difficult to use on high-mobility platforms due to its lack of portability and adaptability.

[0005] Although the laser light curtain target speed measurement system does not rely on natural light sources, its detection surface must be strictly perpendicular to the ballistic line, and the equipment needs to be fixed in a stable environment, which further limits its flexibility and adaptability. For example, the laser light curtain target disclosed in Chinese patent CN108534699B solves the light source problem, but the equipment is large in size, heavy in weight, and has strict layout requirements, and cannot meet the needs of real-time speed measurement on mobile carriers. In addition, the device needs to be precisely aligned with the ballistic line during installation, which makes the installation process complicated, increases dependence on the environment, and cannot meet the needs of flexible use in high-dynamic environments.

[0006] At the same time, in the prior art, the projectile passing the curtain waveform signal received by the detector end is processed and merged through simple signal processing to obtain the final detection signal. Since the existing projectile passing the curtain signal detection technology uses multi-channel sensors and merges the signals through fixed weights or simple weighting methods, it is impossible to dynamically adjust the weights according to the actual signal strength of each channel, resulting in limited detection accuracy. In addition, the determination of interference signals only depends on the signal amplitude or time threshold, which can easily misjudge external interference as a valid signal, affecting system accuracy. The traditional voting rules fail to fully consider the importance of each channel signal, resulting in low-quality signals that may affect the overall judgment, further reducing the accuracy of signal recognition. Summary of the invention

[0007] The present invention provides a transceiver integrated multi-tilt screen integrated photoelectric speed measuring device, a calibration method and a speed measuring method to solve the problems existing in the prior art of limited detection accuracy, low measurement accuracy and efficiency, large equipment size, heavy weight and demanding layout requirements.

[0008] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: an integrated photoelectric speed measuring device with multiple tilted screens for transmitting and receiving, comprising a box, a leveling mechanism is arranged at the lower part of the box, a high-power fiber laser light source, a photodetector and a signal processing circuit are arranged in the box, an elliptical Fresnel lens is arranged on the upper surface of the box, a plurality of tilted beam converters are arranged in a row and at equal intervals in the middle of the upper surface of the Fresnel lens, and a slit aperture is arranged on the upper surface of the beam converter; a high-power fiber laser light source is arranged below the Fresnel lens, and its output light is output to a plurality of beam converters respectively through a fiber beam splitter; the number of photodetectors corresponds to the beam converters, and they are located directly below the Fresnel lens.

[0009] Furthermore, the above-mentioned light beam converter is a cylindrical mirror.

[0010] Furthermore, the calibration method of the above-mentioned integrated transceiver multi-tilt screen integrated photoelectric speed measuring device has the following specific steps:

[0011] Step 1: Determine the trajectory height position L, ensure that the relative spatial relationship between the trajectory and the light curtain is known, and adjust the inclination angle θ of the laser light curtain, where θ is the angle between the light curtain installation surface and the horizontal plane;

[0012] Step 2: Determine the target distance: Determine the angle θ of each laser light curtain i (i=1-4) is the angle and distance d1 between the i-th laser light curtain and the laser light curtain installation surface, d1 is the distance between the emitting end of the first laser light curtain and the second laser light curtain along the installation plane, where d1=d2=d3;

[0013] Step 3: Calculate the distance between light curtains: According to the flight direction of the projectile, calculate the distance between each light curtain at the predetermined trajectory position. The distance between light curtains is calculated as shown in formula (1):

[0014]

[0015] S1, S2, S3, S4, S5, and S6 are the relative positions and distances between the paired laser light curtains when the projectile passes through the four laser light curtains in sequence.

[0016] Furthermore, the inclination angle θ of the light curtain is 54°-60°.

[0017] Furthermore, the testing method of the above-mentioned integrated photoelectric speed measuring device with integrated transceiver and multi-tilt screen has the following specific steps:

[0018] Step 1: Obtain calibration parameters: including the inclination angle θ of the laser light curtain, the trajectory height L, and the angle θ of each laser light curtain i (i=1~4), the distance d1 between the emitting end of the first laser light curtain and the emitting end of the second laser light curtain along the installation plane, the distance d2 between the emitting end of the second laser light curtain and the emitting end of the third laser light curtain along the installation plane, and the distance d3 between the emitting end of the third laser light curtain and the emitting end of the fourth laser light curtain along the installation plane, as well as the parameters of the laser emitter distance trajectory, and the light curtain spacing S can be directly measured with the help of the grating ruler i (i=1-4);

[0019] Step 2: The photoelectric detector captures the waveform signal when the projectile passes through the four laser light curtains, and calculates the time value (t1, t2, t3, t4);

[0020] Step 3: The formula for calculating the time interval is shown in (2);

[0021]

[0022] Step 4: Verify each speed value to obtain the accurate projectile flight speed. The formula of projectile flight speed is shown in formula (3);

[0023]

[0024] Furthermore, in the above step 2, different weight coefficients are assigned to each channel. Along the trajectory direction, the weight coefficient of the middle channel is large, and the weight coefficients of the two edge channels are small.

[0025] Furthermore, in the above step 2, the weight coefficients of the four channels from left to right can be set to: 0.2, 0.4, 0.4, 0.2, respectively.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The calibration of the device of the present invention first clarifies the ballistic height position L, which is determined by the tester based on the actual scene to ensure that the relative spatial relationship between the trajectory and the light curtain is known. Next, the geometric relationship between the light curtain and the trajectory is adjusted to optimize the inclination angle θ of the light curtain so that it can monitor the ballistic object in the best state. The inclination angle θ of the light curtain is defined as the angle between the mounting surface of the light curtain and the horizontal plane, which directly affects the accuracy of the light curtain in detecting ballistic objects, especially in the case of high-speed motion. Any angle error may lead to the accumulation of speed measurement errors, thereby affecting the final measurement results. By accurately adjusting the light curtain angle θ, the present invention effectively reduces the speed measurement error caused by angle deviation.

[0028] In addition, the accuracy of the measurement system of the present invention depends on the distance S between the light curtain and the trajectory line. i and the tilt angle θ of the light curtain i These two parameters determine the accuracy of the light curtain in capturing the projectile's crossing time. i Too short or θ i If the setting is unreasonable, it is easy to produce significant speed measurement errors, especially in the detection of high-speed flying projectiles. To this end, the present invention accurately optimizes S through step 1. i and θ i , ensuring that each light curtain is in the best detection state, minimizing measurement errors, and reducing path deviations and inaccurate time difference calculations caused by angle errors.

[0029] The present invention accurately adjusts the tilt angle θ of the light curtain by deeply analyzing the geometric relationship between the light curtain and the trajectory. i and light curtain spacing S i , thereby optimizing the performance of the entire measurement system. This adjustment method is particularly suitable for scenarios that require high-precision speed measurement, such as ballistic flight and vehicle speed measurement. By reducing the angle error, the present invention significantly improves the accuracy of the measurement results and provides a simple and repeatable light curtain measurement system that is suitable for a variety of application scenarios and has broad application prospects.

[0030] 2. The present invention integrates the traditional active sky curtain target into an integrated design. Through the integrated design and innovative tilted light curtain structure, the tilted light curtain structure effectively improves the robustness and flexibility of the light curtain system, especially in test scenarios that require high precision and flexible deployment, significantly reducing error accumulation and installation complexity. Based on this, the present invention provides a lightweight, portable speed measuring device suitable for high-mobility platforms. First, the device adopts an integrated design to integrate the functions of the all-weather light curtain target speed measuring system, greatly reducing the size and weight of the equipment, improving portability and flexibility, and enabling it to be quickly deployed and used on high-mobility platforms. Secondly, the tilted light curtain structure in the device of the patent invention is generated by combining a beam converter and a slit aperture. Unlike the limitation that the traditional light curtain target is strictly perpendicular to the ballistic line, the tilted light curtain structure is formed by installing the beam converter and the slit aperture arranged thereon at a specific angle, thereby generating a tilted fan-shaped light curtain. This design effectively solves the problem that the photoelectric speed sensor cannot be placed below the predetermined ballistic line due to the limitations of on-site installation conditions, significantly reducing the need for complex calibration and improving measurement accuracy and efficiency. In addition, the device reduces the reliance on manual calibration, significantly reduces the risk of error, and improves the accuracy and efficiency of measurement. Specific improvements include:

[0031] 1) Innovation of light source module: This invention adopts high-power fiber laser light source, fiber beam splitter, beam converter and slit aperture to replace the core light source module in the traditional all-weather sky target. Compared with the traditional light source system, this design not only reduces the size and weight of the equipment, but also greatly improves the utilization efficiency of the light source energy, ensuring stable and sufficient light source support under multi-light curtain conditions. The Fresnel lens can increase the photosensitive area, receive more reflected light, improve signal quality, reduce measurement errors, and provide stable and reliable data.

[0032] 2) Receiving module: The receiving module of the present invention adopts a multi-element independent detector array and combines multi-channel signal integration technology. Each detector works independently, which enhances the accuracy of the signal and reduces noise interference. Especially in complex environments, it can provide high-precision speed measurement data and reduce the error accumulation of the system under noise interference.

[0033] 3) Traditional sky-curtain target speed measurement systems usually require two sets of equipment to work together to complete the measurement task, but the present invention integrates a multi-light curtain structure, and only requires a single set of equipment to achieve accurate measurement of the projectile flight speed. The system structure is simplified, the operation is convenient, and it is suitable for a variety of test environments.

[0034] 3. The test results are stable and reliable:

[0035] 1) Light source module

[0036] The present invention uses an efficient high-power fiber laser light source, combined with a fiber beam splitter and a beam converter, to improve the energy efficiency of the system. Through the high-power fiber light source module, it ensures stable and sufficient light source support under multi-light curtain conditions, so that the high performance of the system can be guaranteed while being lightweight. Compared with traditional light source systems, the light source in this device effectively reduces the size and weight of the device and improves its overall portability.

[0037] 2) Fiber beam splitting technology

[0038] The optical fiber beam splitter evenly distributes the light source energy to each light curtain, ensuring that each light curtain obtains sufficient energy support. The present invention ensures the stability and uniformity of light curtain generation by means of the beam splitter's light splitting capability, low insertion loss, high stability and reliability, and light splitting uniformity, thereby improving the overall performance of the system.

[0039] 3) Portability and application scenario expansion

[0040] The traditional sky target speed measurement system is bulky and complex to operate, requiring two sets of equipment to work together. However, the present invention integrates the originally complex system into a single device through integrated and lightweight design, greatly reducing the size and weight, and facilitating rapid deployment. The device can be mounted on a highly maneuverable platform, such as under a gun barrel or a gun barrel, and can adapt to a variety of test scenarios, such as ballistic flight and vehicle speed measurement, significantly improving measurement efficiency and flexibility.

[0041] 4) Description of multi-channel signal processing

[0042] The present invention realizes efficient signal filtering and analysis through comprehensive processing and weight judgment technology of multi-channel signals, ensures the accuracy and anti-interference of the combined signal, and ensures the reliability of the system in complex environments. By optimizing the processing flow of multi-channel signals, the measurement accuracy and fault tolerance of the equipment are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the device structure and light curtain of the present invention;

[0044] Figure 2 is a schematic diagram of target distance;

[0045] Figure 3 It is a schematic diagram of multi-channel signal judgment.

[0046] The reference numerals are as follows:

[0047] 1. High-power fiber laser light source, 2. Fresnel lens, 3. Beam converter, 4. Slit aperture, 5. Tilted fan-shaped laser light curtain, 6. Reflected laser, 7. Wide-area detection light curtain, 8. Photodetector, 9. Signal processing circuit, 10. Fiber beam splitter. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to embodiments and drawings.

[0049] A multi-tilt screen integrated photoelectric speed measuring device with integrated transmission and reception includes a box, and a leveling mechanism is arranged at the lower part of the box. A high-power fiber laser light source 1, a photodetector 8 and a signal processing circuit 9 are arranged in the box, an elliptical Fresnel lens 2 is arranged on the upper surface of the box, and a plurality of tilted beam converters 3 are arranged in a row at equal intervals in the middle of the upper surface of the Fresnel lens 2, and a slit aperture 4 is arranged on the upper surface of each beam converter 3.

[0050] In this embodiment, a high-power fiber laser light source 1 with a wavelength and power of 2W is selected and used in combination with a 1-to-4 fiber beam splitter 10, four beam converters 3 and a slit diaphragm 4 to form four independent inclined fan-shaped laser light curtains 5. Specifically, the high-power fiber laser light source 1 is arranged below the Fresnel lens 2, and its output light is divided into four beams by the fiber beam splitter 10, and output to the four beam converters 3 respectively. The multiple beams output by the fiber beam splitter 10 are precisely guided to the slit diaphragm 4 on the surface of the beam converter 3. The direction and shape of the light beam are further adjusted by the slit diaphragm 4 to form four uniformly distributed inclined fan-shaped laser light curtains 5 with a certain field of view width. At the same time, the Fresnel lens 2 and the photoelectric detector 8 are matched to form a wide-area detection light curtain 7, covering the entire measurement area to meet the needs of projectile passing through the curtain detection. When the flying projectile passes through the laser light curtain 5, the laser irradiates the projectile body and scatters to form a reflected laser 6. The reflected laser 6 is converged by the Fresnel lens 2 arranged below the four light beams divided by the optical fiber beam splitter 4 and focused on the photodetector 8. The reflected light received by the photodetector 8 will produce a photoelectric effect and output an electrical signal. The electrical signal output by the photodetector 8 is processed by the signal processing circuit 9, and after processing, a curtain-passing signal of the projectile passing through the laser light curtain is generated. There are four photodetectors 8, which are located directly below the Fresnel lens 2, and their detection surface is located on one side of the beam converter 3 to optimize the detection effect and improve the speed measurement accuracy and detection range.

[0051] See also Figure 1, the beam converter 3 in this embodiment is a cylindrical mirror. The cylindrical mirror has a simple structure, which consists of a plane mirror and a convex mirror. Therefore, the received laser energy can be beam-broadened and expanded to form an inclined fan-shaped laser light curtain 5. The cylindrical mirror corrects the focusing of the light at different curvatures by changing the propagation path of the light, thereby reducing the spherical aberration caused by the spherical geometry. At the same time, the cylindrical mirror optimizes the dispersion control of the light, so that light of different wavelengths can be better converged at the same focus, significantly reducing chromatic aberration. A slit aperture 4 is set on the cylindrical mirror to realize the one-dimensional magnification function, expand the beam into a light curtain of a specific angle, and ensure that the thickness of the light curtain is consistent. In this embodiment, the laser light curtain is set at an angle of 60°, 58°, 56°, and 54°, respectively, so that 4 laser light curtains are formed 5 to 8 meters in front of the muzzle to detect the curtain signal when the projectile passes.

[0052] The four cylindrical mirrors and the slit aperture 4 thereon constitute an independent detector, and the four independent detectors are arranged in a line along the trajectory direction, covering the maximum target distance of 3.4m, ensuring that the width of the fan-shaped field of view is greater than the width of the laser light curtain in the width direction. And the multiple independent detectors are connected to the signal processing circuit 9 through the four photoelectric detectors 8 respectively, and output multiple signals independently of each other.

[0053] The present invention further provides a calibration method for a transceiver integrated multi-tilt screen integrated photoelectric speed measuring device, the specific steps are as follows:

[0054] Step 1: Determine the height position L of the trajectory to ensure that the relative spatial relationship between the trajectory and the light curtain is known;

[0055] Adjust the inclination angle θ of the laser light curtain, where θ is the angle between the installation surface of the light curtain and the horizontal plane.

[0056] Step 2: Determine the target distance: Set the projectile to pass through the inclined laser light curtain in sequence. The target distance diagram is as follows: Figure 2 As shown, the angle θ of each laser light curtain is determined in detail. i (i=1~4) is the angle between the i-th laser light curtain and the laser light curtain installation surface, and the distance d1, d1 is the distance between the emitting end of the first laser light curtain and the second laser light curtain along the installation plane, where d1=d2=d3.

[0057] Step 3: Calculate the distance between light curtains: According to the flight direction of the projectile, calculate the distance between each light curtain at the predetermined trajectory position. The distance between light curtains is calculated as shown in formula (1).

[0058]

[0059] S1, S2, S3, S4, S5, and S6 are the relative positions and distances between the paired laser light curtains when the projectile passes through the four laser light curtains in sequence.

[0060] See also Figure 2 The specific steps of the test method of the above-mentioned integrated transceiver multi-tilt screen integrated photoelectric speed measuring device are as follows:

[0061] Step 1: Obtain the calibration parameters: including the inclination angle θ of the laser light curtain (the angle between the laser light curtain installation surface and the horizontal plane), the trajectory height L (the vertical height of the device from the trajectory position), the angle θ between the i-th laser light curtain and the laser light curtain installation surface i (i=1-4), the distance d1 between the first laser light curtain emitting end and the second laser light curtain along the installation plane, the distance d2 between the second laser light curtain emitting end and the third laser light curtain along the installation plane, and the distance d3 between the third laser light curtain emitting end and the fourth laser light curtain along the installation plane, as well as the parameters of the laser emitter distance trajectory. It also includes the light curtain spacing S directly measured by the grating ruler i (i=1-4), S1, S2, S3, S4, S5, S6 are the relative positions and distances between the paired laser light curtains when the projectile passes through the four laser light curtains in sequence.

[0062] Among them, S1 represents the horizontal distance between light curtain 1 and light curtain 2 when the trajectory line position is determined, S2 represents the horizontal distance between light curtain 2 and light curtain 3, S3 represents the horizontal distance between light curtain 3 and light curtain 4, S4 represents the horizontal distance between light curtain 1 and light curtain 3, S5 represents the horizontal distance between light curtain 2 and light curtain 4, and S6 represents the horizontal distance between light curtain 1 and light curtain 4.

[0063] Step 2: The photoelectric detector 8 captures the waveform signal when the projectile passes through the four laser light curtains, and calculates the time value (t1, t2, t3, t4)

[0064] When the flying projectile passes through the four laser light curtains in sequence along the trajectory, the laser irradiates the surface of the projectile and scatters. The scattered light is focused by the Fresnel lens and captured by the photodetector 8. The detector converts the received light signal into a corresponding analog electrical signal through the photoelectric effect, which represents the instantaneous position of the projectile passing through each light curtain. By analyzing these output analog signals, the time point (t1, t2, t3, t4) of the projectile passing through each light curtain can be accurately extracted.

[0065] Specifically, the method for obtaining the time value by calculating the waveform signal is: Figure 3 ,According to the projectile passing the curtain waveform signal received by the detector end, this device processes the output signals of 4 channels and merges them to obtain the final detection signal.

[0066] The signal merging method based on adaptive dynamic weight allocation of signal strength proposed by the present invention adjusts the weight coefficient of each channel in real time to reflect the received signal strength. The weight coefficients of the four channels are 0.2, 0.4, 0.4, and 0.2, respectively, to improve the accuracy and reliability of signal merging. In addition, a time window judgment mechanism is adopted to filter signals that are not within the preset time window to prevent interference signals from affecting the detection results. For signals within the time window, a weight-based voting fusion rule is used to make a judgment. When the weight decision value reaches or exceeds 0.4, the signal is judged to be a valid signal, avoiding the misjudgment phenomenon caused by weak signals.

[0067] Compared with the existing technology that only relies on majority voting, this method can make more accurate judgments based on the actual contribution of each channel signal, significantly improving the detection accuracy and reliability of the system. The judgment results of the 4-channel signal are shown in Table 2: If only the two edge channels output signals, the system considers the signal to be a false signal caused by external interference; if the two middle channels, three adjacent channels, or all four channels have signal outputs, and the signal is within the time window, the system determines that the signal is a valid output signal.

[0068] Table 1 Channel signal decision results

[0069]

[0070]

[0071] According to the above judgment criteria, the signals of the four channels can be comprehensively judged from the aspects of time domain, frequency domain and weight, and the effective projectile passing signal output in the combined channel can be determined. Figure 3 A scheme is determined for effective signals, where the weight of interference signal 1 is only 0.1 and can be filtered out; the weight of interference signal 2 is 1, but the signal is not within the time window and can be filtered out; the weights of the four projectile passing signals are all greater than 0.4 and can be identified as effective signals.

[0072] Step 3: Combining the flight direction of the projectile, the inclination angle of the laser light curtain, and the projection length of the projectile in the direction of the laser light curtain, the time value when the center plane of the projectile length passes through the laser light curtain can be calculated, and then the time t1, t2, t3, t4 of passing through the four light curtains can be calculated, and the time interval between each pair of light curtains can be calculated, as shown in formula (2).

[0073]

[0074] According to the target distance and the time interval between the curtains, the projectile velocity is measured by using the fixed-distance timing principle. The velocity calculation formula is shown in formula (3). The six velocities can be verified with each other to obtain the accurate projectile flight velocity.

[0075]

[0076] Based on the speed measurement principle, the laser light curtain emitting ends are arranged equidistantly, with a spacing of 40 mm, that is, d1 = d2 = d3 = 40 mm; θ = 45°; the inclination angles are θ1 = 60°, θ2 = 58°, θ3 = 56°, and θ4 = 54°, respectively. The target distance calculation results are shown in Table 2. The maximum target distance is 3.4 m and the minimum target distance is 1 m. In order to reduce the relative error of speed measurement, the final speed can be calculated based on the maximum target distance and the corresponding curtain time.

[0077] Table 2 Calculation of target distance at different tilt angles

[0078] L <![CDATA[s1]]> <![CDATA[s2]]> <![CDATA[s3]]> <![CDATA[s4]]> <![CDATA[S5]]> <![CDATA[s6]]> 1.5m 1.0m 1.4m 1.0m 2.4m 2.4m 3.4m

[0079] Step 3: Using the fixed-distance test principle, measure the projectile velocity according to the target distance and time interval. The formula for calculating the projectile flight velocity is shown in formula (4);

[0080]

[0081] The embodiments described above are only preferred specific implementation modes of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belong to the protection scope of the present invention.

Claims

1. A multi-tilt screen integrated photoelectric speed measuring device with integrated transceiver, comprising a box, a leveling mechanism is arranged at the lower part of the box, and is characterized by: A high-power fiber laser light source (1), a photodetector (8) and a signal processing circuit (9) are arranged in the box, an elliptical Fresnel lens (2) is arranged on the upper surface of the box, a plurality of inclined beam converters (3) are arranged in a row at equal intervals in the middle of the upper surface of the Fresnel lens (2), and a slit aperture (4) is arranged on the upper surface of each of the beam converters (3); The high-power fiber laser light source (1) is arranged below the Fresnel lens (2), and its output light is output to a plurality of beam converters (3) respectively via a fiber beam splitter (10); The number of the photodetectors (8) corresponds to the number of the beam converters (3), and the photodetectors (8) are located directly below the Fresnel lens (2).

2. The multi-tilt screen integrated photoelectric speed measuring device with integrated transmission and reception according to claim 1 is characterized by: The light beam converter (3) is a cylindrical mirror.

3. The calibration method of the integrated photoelectric speed measuring device with multiple tilted screens and integrated transceiver according to claim 1 is characterized in that: The steps are as follows: Step 1: Determine the trajectory height position L, ensure that the relative spatial relationship between the trajectory and the light curtain is known, and adjust the inclination angle θ of the laser light curtain, where θ is the angle between the light curtain installation surface and the horizontal plane; Step 2: Determine the target distance: Determine the angle θ of each laser light curtain i (i=1-4) is the angle and distance d1 between the i-th laser light curtain and the laser light curtain installation surface, d1 is the distance between the emitting end of the first laser light curtain and the second laser light curtain along the installation plane, where d1=d2=d3; Step 3: Calculate the distance between light curtains: According to the flight direction of the projectile, calculate the distance between each light curtain at the predetermined trajectory position. The distance between light curtains is calculated as shown in formula (1): S1, S2, S3, S4, S5, and S6 are the relative positions and distances between the paired laser light curtains when the projectile passes through the four laser light curtains in sequence.

4. The calibration method of the integrated photoelectric speed measuring device with multiple tilted screens and integrated transceiver according to claim 3 is characterized in that: The inclination angle θ of the light curtain is 54°-60°.

5. The testing method of the multi-tilt screen integrated photoelectric speed measuring device with integrated transmission and reception according to claim 1, characterized in that: The specific steps are as follows: Step 1: Obtain calibration parameters: including the inclination angle θ of the laser light curtain, the trajectory height L, and the angle θ of each laser light curtain i (i=1~4), the distance d1 between the emitting end of the first laser light curtain and the emitting end of the second laser light curtain along the installation plane, the distance d2 between the emitting end of the second laser light curtain and the emitting end of the third laser light curtain along the installation plane, and the distance d3 between the emitting end of the third laser light curtain and the emitting end of the fourth laser light curtain along the installation plane, as well as the parameters of the laser emitter distance trajectory, and the light curtain spacing S can be directly measured with the help of the grating ruler i (i=1-4); Step 2, the photoelectric detector (8) is used to capture the waveform signal when the projectile passes through the four laser light curtains, and record the time value (t1, t2, t3, t4) corresponding to each channel; Step 3: The formula for calculating the time interval is shown in (2); Step 4: Verify each speed value to obtain the accurate projectile flight speed. The formula for calculating the projectile flight speed is shown in formula (3); 6. The testing method of the integrated photoelectric speed measuring device with multiple tilted screens and integrated transmitting and receiving according to claim 5 is characterized in that: In the step 2, different weight coefficients are assigned to each channel. Along the trajectory direction, the weight coefficient of the middle channel is large, and the weight coefficients of the two channels at the edge are small.

7. The testing method of the integrated photoelectric speed measuring device with multiple tilted screens and integrated transceiver according to claim 6 is characterized in that: In the step 2, the weight coefficients of the four channels from left to right can be set to: 0.2, 0.4, 0.4, 0.2, respectively.

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