A method for simulating projectile passing through a target

Abstract

This invention belongs to the field of endpoint ballistic testing technology and relates to a projectile passage simulation method. A high-speed data acquisition card is used to acquire and record the original waveform of the projectile passing through a light curtain target, serving as the basis for the simulation signal. The light curtain target's light source is connected to a focusing and collimating lens via an optical fiber. The focusing and collimating lens is used to focus and collimate the light signal emitted by the light curtain target's own light source. A light intensity modulator is located in the middle between the focusing and collimating lens and the focusing lens. A high-speed drive module is electrically connected to the light intensity modulator. The simulated projectile passage waveform is fed back to the light curtain target's own receiver detector. This projectile passage simulation method is highly versatile for evaluating the accuracy of light curtain target measurements. It involves few auxiliary devices, has high integration, and high evaluation accuracy, effectively supporting the evaluation of light curtain target measurement accuracy and supporting the development of armor protection technology.

Description

Technical Field

[0001] This invention belongs to the field of endpoint ballistic testing technology, and relates to projectile velocity testing technology, and in particular to a projectile target passage simulation method. Background Technology

[0002] In the field of terminal ballistic testing, projectile velocity is a key parameter for evaluating armor protection performance, and projectile velocity measurement is generally completed by a light curtain target velocity measurement system.

[0003] The light curtain target velocity measurement system includes two light curtain targets placed parallel to each other at a certain distance along the trajectory and a time measurement module. Each light curtain target establishes a light curtain in a direction perpendicular to the trajectory. The velocity measurement principle of the light curtain target velocity measurement system is that when the projectile passes through the two light curtain targets in succession, it blocks the light curtain and causes changes in light intensity. The two light curtain targets sensitively capture the changes in light intensity and output response signals. The time measurement module measures the time difference between the two response signals and calculates the projectile velocity by combining the distance parameter between the two light curtain targets.

[0004] Currently, there is no high-precision method for evaluating the accuracy of light curtain target measurements. One existing method for evaluating the accuracy of light curtain target measurements is based on the following principle: Figure 1 As shown, two light curtain targets 1 are placed parallel to each other at a certain distance. The projectile passes through the light curtain target 1 along the trajectory direction 2. External light sources are arranged around the light curtain target 1 and a signal source drives the external light sources to flash, causing changes in light intensity within a certain range around the external light sources. This causes the light curtain target to output a response signal. The time measurement module 3 measures and calculates the time difference when the projectile passes through the two light curtain targets 1. By comparing the time width of the response signal output by the light curtain target with the time width of the external light source flashing driven by the signal source, and combining the target distance parameters of the two light curtain targets 1, the accuracy of the measurement of the light curtain target 1 is evaluated.

[0005] This method is affected by factors such as the response speed of the external light source when it is driven to emit light, the consistency between the wavelength of the external light source and the wavelength of the light curtain target light source and the matching between the response curve of the light curtain target detector and the wavelength of the external light source under uncertain conditions of different light curtain target light source wavelengths and light curtain target detector response parameters, and the placement position of the light source. As a result, the accuracy of this method is low when used to evaluate the accuracy of light curtain target measurement, which further affects the accuracy of armor protection performance evaluation and restricts the development of armor protection. Summary of the Invention

[0006] The technical problem this invention aims to solve is to provide a projectile-to-target simulation method for high-precision evaluation of the accuracy of light curtain target measurements, thereby supporting the improvement of endpoint ballistic testing accuracy and the development of armor protection technology. The technical solution adopted by this invention is as follows:

[0007] A method for simulating projectile passing over a target includes the following steps:

[0008] Step 1: Use a data acquisition card to acquire and record the original waveform of the projectile passing through the light curtain target, which will serve as the basis for simulating the projectile passing through the target simulation signal.

[0009] Step 2: The light source of the light curtain target is connected to the focusing collimating lens through the optical fiber for light acquisition. The focusing collimating lens is used to focus and collimate the light signal emitted by the light source of the light curtain target, so that the diameter of the light spot at 20-30mm in front of the focusing collimating lens is no more than 1.8mm, which meets the requirements of the light intensity modulator for the size of the input light spot when performing high-speed light intensity modulation. The lens diameter of the focusing collimating lens is 3mm, the lens focal length is 10mm, and the focal length can be adjusted within a range of 2mm.

[0010] Step 3: The focusing lens is connected to the detector at the light curtain target receiver via an optical feedback fiber. The light intensity modulator is located in the middle between the focusing collimating lens and the focusing lens. The high-speed drive module is electrically connected to the light intensity modulator. The light signal emitted by the light source of the focused and collimated light curtain target is input to the light intensity modulator for light intensity modulation. During light intensity modulation, based on the original waveform of the projectile passing through the target obtained in Step 1, the high-speed drive module controls the modulation time, frequency, and intensity of the light intensity modulator to obtain the simulated waveform of the projectile passing through the target.

[0011] Step 4: The simulated waveform of the projectile passing over the target is fed back to the light curtain target receiver detector built into the light curtain target to avoid the impact of inconsistent light source wavelengths of different light curtain targets and inconsistent response curves of the light curtain target receiver detectors on the accuracy of the light curtain target measurement.

[0012] Preferably, both the optical fiber for light acquisition and the optical fiber for light feedback are multimode optical fibers with a core diameter of 600 μm, a wavelength range of 380–2500 nm, a length of 1 m, and an interface type of SMA905.

[0013] Preferably, when simulating projectile passing through a target, the projectile passing through the target waveform acquired by the high-speed data acquisition card is uniformly sampled at 8 points t within the time width range. i Read the light intensity information Φ corresponding to 8 points on the waveform. i The above information is used as waveform feature information in t i and Φ i The coordinates are recorded, and a high-speed drive module is used to drive the light intensity modulator to reproduce the information represented by these 8 points, reconstruct the waveform of the projectile passing through the target, and further use it to evaluate the accuracy of the light curtain target measurement, i = 1, 2... 8.

[0014] Preferably, the light intensity modulator is a spatial photoacoustic-optic modulator with a maximum frequency of 100MHz, a diffraction efficiency of 85%, and an optical power density of 250W / mm². 2 Drive power 1.8W, input impedance 50Ω.

[0015] Preferably, the high-speed drive module uses a waveform generator AFG31102.

[0016] The beneficial effects of this invention are:

[0017] The present invention relates to a projectile target passage simulation method, which is highly versatile for evaluating the accuracy of light curtain target measurements. It involves few auxiliary devices, has a high degree of integration, and provides high evaluation accuracy. It can effectively support the evaluation of the accuracy of light curtain target measurements and support the development of armor protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the principle of light curtain target measurement in existing technology;

[0019] Figure 2 This is a schematic diagram of the simulation system structure of the projectile passing through the target simulation method according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the original waveform signal of the projectile passing through the target, acquired using a high-speed data acquisition card according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the simulated output waveform of the projectile passing through the target in an embodiment of the present invention.

[0022] Among them, 1-light curtain target, 2-ballistic direction, 3-time measurement module, 4-light curtain target light source, 5-light acquisition fiber, 6-focusing collimating lens, 7-focusing lens, 8-light intensity modulator, 9-high speed drive module, 10-light feedback fiber, 11-light curtain target receiver detector. Detailed Implementation

[0023] The technical solutions involved in this invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the technical solutions.

[0024] like Figure 2 The diagram shown is a schematic representation of the simulation system structure of the projectile target passage simulation method according to an embodiment of the present invention. A projectile target passage simulation method includes the following steps:

[0025] Step 1: Use a high-speed data acquisition card to acquire and record the original waveform of the projectile passing through the light curtain target 1, as the basis for simulating the projectile passing through the target simulation signal. For example... Figure 3 The diagram shown is a schematic of the original waveform signal of the projectile passing through the target acquired by a high-speed data acquisition card in an embodiment of the present invention. The present invention uses this original waveform to simulate the projectile passing through the target.

[0026] Step 2: The light source 4 of the light curtain target is connected to the focusing and collimating lens 6 via the optical fiber 5. The focusing and collimating lens 6 performs optical processing such as focusing and collimation on the light signal emitted by the light source of the light curtain target 1, ensuring that the diameter of the light spot at the front 20-30mm of the lens of the focusing and collimating lens 6 is no greater than 1.8mm. This meets the requirements for the input light spot size of the light intensity modulator 8 during high-speed light intensity modulation. The focusing and collimating lens 6 has a lens diameter of 3mm, a lens focal length of 10mm, and an adjustable focal length range of 2mm. Using the light signal emitted by the light source of the light curtain target 1 as a simulated input source avoids the impact of inconsistent wavelengths of different light curtain target light sources and inconsistent response curves of the light curtain target detectors on the accuracy evaluation of the light curtain target 1.

[0027] Step 3: Focusing lens 7 is connected to detector 11 at the light curtain target receiver via optical feedback fiber 10. Light intensity modulator 8 is located midway between focusing and collimating lens 6 and focusing lens 7. High-speed drive module 9 is electrically connected to light intensity modulator 8. The light signal emitted by the light source of the focused and collimated light curtain target 1 is input to light intensity modulator 8 for light intensity modulation. During light intensity modulation, based on the original waveform of the projectile passing through the target obtained in step 1, the high-speed drive module 9 controls the modulation time, frequency, and intensity of light intensity modulator 8 to obtain a simulated waveform of the projectile passing through the target. For example... Figure 4 The figure shown is a schematic diagram of the simulated output waveform of the projectile passing through the target in an embodiment of the present invention.

[0028] When simulating the projectile passing through the target, the projectile passing through the target waveform acquired by the high-speed data acquisition card is uniformly sampled at 8 points t within the time width range. i (i = 1, 2, ..., 8), read the light intensity information Φ corresponding to 8 points on the waveform. i (i = 1, 2, ..., 8), the above information is used as waveform feature information with (t) i , Φ i The coordinates are recorded, and the high-speed drive module 9 drives the light intensity modulator 8 to reproduce the information represented by these 8 points, reconstruct the waveform of the projectile passing through the target, and further use it to evaluate the accuracy of the light curtain target measurement.

[0029] Step 4: The simulated waveform of the projectile passing through the target is fed back to the light curtain target receiver detector 11 built into the light curtain target 1. This avoids the impact of different photoelectric conversion devices on the measurement accuracy evaluation of the light curtain target 1, and avoids the impact of inconsistent light source wavelengths and inconsistent detector response curves of different light curtain targets 1 on the measurement accuracy evaluation of the light curtain target 1.

[0030] The optical acquisition fiber 5 and optical feedback fiber 10 are both multimode optical fibers with a core diameter of 600um, a wavelength range of 380 to 2500nm, a length of 1m, and an interface type of SMA905.

[0031] The focusing collimating lens 6 has a spot diameter of no more than 1.8 mm at 20-30 mm from the front end, a wavelength range of 400-1500 nm, and an interface type of SMA905; the focusing lens 7 has a lens diameter of 5 mm, a focal length of 10 mm, and a wavelength range of 200-2500 nm.

[0032] The light intensity modulator 8 described above employs a spatial optical-acoustic-optic modulator with a maximum frequency of 100MHz, a diffraction efficiency of 85%, and an optical power density of 250W / mm². 2 Drive power 1.8W, input impedance 50Ω.

[0033] The high-speed drive module 9 uses a waveform generator AFG31102, and the output drive signal is consistent with the waveform of the actual projectile passing over the target.

[0034] In the embodiments of the present invention, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0035] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for simulating projectile passing over a target, characterized in that, Includes the following steps: Step 1: Use a data acquisition card to acquire and record the original waveform of the projectile passing through the light curtain target (1), as the basis for simulating the projectile passing through the target simulation signal; Step 2: The light source (4) of the light curtain target is connected to the focusing collimating lens (6) through the light acquisition fiber (5). The focusing collimating lens (6) is used to focus and collimate the light signal emitted by the light source of the light curtain target (1) to ensure that the diameter of the light spot at the front end of the focusing collimating lens (6) is no more than 1.8mm, the lens diameter of the focusing collimating lens (6) is 3mm, the lens focal length is 10mm, and the focal length can be adjusted within a range of 2mm. Step 3: The focusing lens (7) is connected to the detector (11) of the light curtain target receiver through the optical feedback fiber (10). The light intensity modulator (8) is located in the middle position between the focusing collimating lens (6) and the focusing lens (7). The high-speed drive module (9) is electrically connected to the light intensity modulator (8). The light signal emitted by the light curtain target (1) after focusing and collimation is input to the light intensity modulator (8) for light intensity modulation. During light intensity modulation, the high-speed drive module (9) controls the modulation time, frequency and intensity of the light intensity modulator (8) according to the original waveform of the projectile passing the target obtained in step 1, so as to obtain the simulated waveform of the projectile passing the target. Step 4: The simulated waveform of the projectile passing through the target is fed back to the light curtain target receiver detector (11) built into the light curtain target (1) to avoid the impact of inconsistent light source wavelengths of different light curtain targets (1) and inconsistent response curves of the light curtain target receiver detector (11) on the measurement accuracy evaluation of the light curtain target (1). The optical acquisition fiber (5) and optical feedback fiber (10) are both multimode fibers with a core diameter of 600um, a wavelength range of 380 to 2500nm, a length of 1m, and an interface type of SMA905.

2. The projectile-to-target simulation method according to claim 1, characterized in that, When simulating the projectile passing through the target, the projectile passing through the target waveform acquired by the high-speed data acquisition card is uniformly sampled at 8 points t within the time width range. i Read the light intensity information Φ corresponding to 8 points on the waveform. i The above information is used as waveform feature information in t i and Φ i The coordinate points are recorded, and the high-speed drive module (9) drives the light intensity modulator (8) to reproduce the information represented by these 8 points, reconstruct the waveform of the projectile passing through the target, and further use it to evaluate the accuracy of the light curtain target measurement, i=1,2……8.

3. The projectile-to-target simulation method according to claim 1, characterized in that, The light intensity modulator (8) mentioned above adopts a spatial optical-acoustic-optic modulator with a maximum frequency of 100MHz, a diffraction efficiency of 85%, and an optical power density of 250W / mm². 2 Drive power 1.8W, input impedance 50Ω.

4. The projectile-to-target simulation method according to claim 1, characterized in that, The high-speed drive module (9) uses a waveform generator AFG31102.

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