A ballistic imaging method and system based on infrared laser

Abstract

The present invention provides a ballistic imaging method and system based on infrared laser. The system comprises: an infrared laser emitting module, a receiving module and a host computer. The infrared laser emitting module comprises a power supply, an infrared laser beam array, a scattering mirror, a collimating mirror and a housing. The receiving module comprises a bandpass filter, a photodiode array, an outer frame and a data interface. In this system, the infrared laser beam array emits multiple infrared laser beams. Through the action of the scattering mirror and the collimating mirror, the multiple independent infrared laser beams form an infrared laser column that can completely cover the photodiode array. The bandpass filter on the receiving module can transmit light waves with wavelengths within the infrared light range. The photodiode array receives infrared signals to form a path, and the host computer records the power supply status of each photodiode on the photodiode array.

Description

Technical Field

[0001] The present invention relates to the field of timing and speed measurement, and in particular to a ballistic imaging method and system based on infrared laser. Background Art

[0002] In current high-speed penetration / armor-penetration experiments, projectile velocity, attitude, and trajectory are crucial experimental parameters. High-speed photography and target-net velocimetry are commonly used to obtain this information. High-speed photography uses a high-speed camera to capture the projectile's trajectory through the target, recording its relative position and attitude. By calculating its spatial position within a specific time interval, the projectile's velocity and trajectory are then calculated.

[0003] In the existing technology, high-speed photography systems rely on high-speed cameras to take photos with a time interval of microseconds to record the real-time movement of high-speed moving projectiles. After the experiment, the motion state of the projectile is obtained through analysis and processing of the photos. This is a commonly used test method in armor penetration / penetration experiments. However, it has the following disadvantages: (1) It has extremely high lighting requirements: in low-light conditions without external light sources, it is impossible to obtain high-frame rate images; (2) It is greatly affected by strong light: during the armor penetration / penetration of metal targets, extremely strong flashes are generated, and the high-speed camera is overexposed and cannot obtain the motion state of the projectile in the flash area.

[0004] The light curtain test system is also often used in the prior art. Its principle is similar to that of the target net test system, except that the test target is optimized as a light curtain target. The light curtain target is mainly composed of a light curtain transmitter and a receiver. The light curtain transmitter generates a light curtain between it and the receiver. When the projectile passes through the light curtain, part of the light on the receiver is blocked, thereby generating a signal. The projectile movement speed is then calculated based on the test target spacing and the signal time difference of each receiver. It has the following disadvantages: (1) Only the movement speed of the projectile can be obtained, and the movement trajectory and posture of the moving projectile cannot be determined; (2) When the target plate is broken, a large number of fragments are generated. Some of the fragments have a higher speed than the test projectile and pass through the test target before the test projectile, making it impossible to determine whether the signal is generated by the projectile.

[0005] The orthogonal light curtain test system is an improvement on the light curtain test system. Its basic principle is as follows: the test target consists of two pairs of orthogonally placed light curtain transmitters and receivers, forming a vertically staggered light curtain on the same plane; when the projectile passes through the light curtain, the vertical and horizontal receivers at the corresponding positions generate signals, thereby calculating the horizontal and vertical positions of the projectile on the test target at that time; combining multiple test targets arranged at intervals to obtain the ballistic position of the projectile, and then obtain the horizontal, vertical, and ballistic positions of the projectile at different times during the entire movement process, realizing the motion trajectory speed record of the projectile. Its disadvantages are: (1) it is impossible to obtain the deflection posture of the projectile at any time; (2) the data accuracy is related to the number of test targets. It is not easy to arrange too many test targets in field tests, and the cost-effectiveness is low; (3) it is greatly affected by target plate fragments, and it is impossible to determine whether the signal is generated by the projectile.

[0006] It can be seen that how to obtain the ballistic trajectory of the projectile in the fire zone, especially the deflection posture of the projectile, and realize real-time monitoring of the motion state of the projectile after penetrating the target in the high-speed armor-piercing experiment is an urgent problem to be solved. Summary of the Invention

[0007] In view of this, the present invention provides a ballistic imaging method based on infrared laser, which can obtain the motion trajectory and deflection of the projectile in the target's rear-flame area. The infrared laser transmitting module 1 is composed of a power supply 101, an infrared laser beam array 102, a scattering mirror 103, a collimating mirror 104, and a housing 105; the receiving module 2 is composed of a bandpass filter 201, a photodiode array 202, an outer frame 203, and a data interface 204.

[0008] The infrared laser beam array 102 emits multiple infrared laser beams. Through the action of the scattering mirror 103 and the collimating mirror 104, the multiple independent infrared laser beams form an infrared laser column that can completely cover the photodiode array 202. The bandpass filter 201 on the receiving module 2 can transmit light waves with wavelengths within the infrared light range. The photodiode array 202 receives the infrared signal and forms a path. The host computer 3 records the power supply status of each photodiode on the photodiode array 202.

[0009] When the bullet passes through the experimental target plate and moves to the infrared laser area, the projectile blocks part of the infrared laser, and the photodiode at the corresponding position of the photodiode array 202 has no light signal. Combined with the spatial position of the photodiode on the photodiode array 202, the host computer 3 can draw the projectile posture and spatial position at different times.

[0010] In particular, based on the infrared laser on-off frequency T and the total duration t of the projectile's movement in the photodiode array 202, T×t frames of images recording the projectile's spatial position and posture can be obtained, and the projectile's velocity and trajectory can be further calculated.

[0011] In particular, in the infrared laser emitting module 1, the power supply 101, the infrared laser beam array 102, the scattering mirror 103 and the collimating mirror 104 are fixed in sequence in the housing 105; the power supply 101 is connected to the infrared laser beam array 102 and is the power input port of the infrared laser array 102; the scattering mirror 103 is in front of the emitting end of the infrared laser beam array 102, and the collimating mirror 104 is behind the scattering mirror; there is an optimal distance between the scattering mirror 103 and the collimating mirror 104 of the infrared laser beam array 102, which is adjusted according to the size of the infrared laser array.

[0012] In particular, in the receiving module 2, the outer frame 203 is a metal box-shaped shell with an open side; the photodiode array 202 is located in the cavity surrounded by the outer frame 203; the photosensitive element is facing the opening direction of the outer frame 203; the bandpass filter 201 covers the opening of the outer frame 203 to form a sealed environment; the photodiode array 202 is composed of an integrated circuit and a photodiode array, and the square photodiodes are arranged closely in a matrix to form a photodiode array.

[0013] In particular, the data interface 204 is connected to the photodiode array 202 and sends the signal collected by the photodiode array 202 to the host computer 3 .

[0014] The present invention also proposes a ballistic imaging system based on infrared laser, which includes: an infrared laser emitting module 1, a receiving module and a host computer; wherein the infrared laser emitting module 1 is composed of a power supply 101, an infrared laser beam array 102, a scattering mirror 103, a collimating mirror 104 and a housing 105; the receiving module 2 is composed of a bandpass filter 201, a photodiode array 202, an outer frame 203 and a data interface 204, and is characterized in that the infrared laser beam array 102 in the system emits multiple infrared laser beams, and through the action of the scattering mirror 103 and the collimating mirror 104, the multiple independent infrared laser beams form an infrared laser column that can completely cover the photodiode array 202; the bandpass filter 201 on the receiving module 2 can transmit light waves with wavelengths within the infrared light range; the photodiode array 202 receives the infrared signal to form a path, and the host computer 3 records the power supply status of each photodiode on the photodiode array 202;

[0015] When the bullet passes through the experimental target plate and moves to the infrared laser area, the projectile blocks part of the infrared laser, and the photodiode at the corresponding position of the photodiode array 202 has no light signal. Combined with the spatial position of the photodiode on the photodiode array 202, the host computer 3 can draw the projectile posture and spatial position at different times.

[0016] Beneficial effects:

[0017] (1) The solution of the present invention can obtain the motion trajectory and deflection of the projectile in the target-backed flare zone;

[0018] (2) The solution of the present invention can monitor the real-time motion state of the projectile, and the speed measurement accuracy is higher;

[0019] (3) The solution of the present invention is not affected by target plate fragments, and the image obtained from the photodiode array can distinguish the outlines of the projectile and the fragments;

[0020] (4) The device of the present invention is easy to install and is suitable for any lighting conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a testing system of the present invention;

[0022] Figure 2 Schematic diagram of infrared laser emission module 1;

[0023] Figure 3 is a schematic diagram of the receiving module 2;

[0024] Figure 4 Schematic diagram of the working principle of ballistic imaging in the present invention

[0025] Figure 5 Schematic diagram of the photodiode array working in the present invention

[0026] In the figure, 1. infrared laser transmitting module, 2. receiving module, 3. host computer, 101. power supply, 102. infrared laser beam array, 103. scattering mirror, 104. collimating mirror, 105. housing, 201. bandpass filter, 202. photodiode array, 203. outer frame, 204. data interface. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0028] This invention provides an infrared laser-based ballistic imaging method suitable for projectile armor-penetration experiments. It records parameters such as the projectile's posture, trajectory, and residual velocity after it penetrates a metal target. The method comprises an infrared laser transmitter module 1, a receiver module 2, and a host computer 3.

[0029] The infrared laser emitting module 1 consists of a power supply 101, an infrared laser beam array 102, a scattering mirror 103, a collimating mirror 104, and a housing 105. The power supply 101, infrared laser beam array 102, scattering mirror 103, and collimating mirror 104 are sequentially secured within the housing 105. The power supply 101 is connected to the infrared laser beam array 102 and serves as the power input port for the infrared laser array 102. The scattering mirror 103 is located in front of the emitting end of the infrared laser beam array 102, and the collimating mirror 104 is located behind the scattering mirror. An optimal distance exists between the scattering mirror 103 and the collimating mirror 104 of the infrared laser beam array 102, which is adjusted based on the size of the infrared laser array.

[0030] The present invention is based on the fact that infrared laser can penetrate flames and strong light. In the armor-piercing experiment, the test system of the present invention is placed behind the target plate, and the trajectory of the projectile passes through the infrared laser area.

[0031] At the start of the experiment, the infrared laser emitting module 1 and the host computer 3 are powered on. Power supply 101 is activated, and infrared laser array 102 emits multiple infrared laser beams. Through the action of scattering mirror 103 and collimating lens 104, these multiple independent infrared laser beams form an infrared laser beam that completely covers photodiode array 202. Bandpass filter 201 on receiving module 2 filters light with wavelengths above 1000 nm, while transmitting infrared light within the wavelength range of 760 nm to 1000 nm. Photodiode array 202 receives the infrared signal, establishing a pathway. Host computer 3 then begins recording the power status of each photodiode on photodiode array 202.

[0032] At time t1, the bullet passes through the experimental target and moves into the infrared laser zone. At this point, the projectile partially blocks the infrared laser light, and the photodiodes at the corresponding positions on the photodiode array 202 produce no light signal. Host computer 3 then records the signals from each photodiode. By processing this data and combining the spatial positions of the photodiodes on the photodiode array 202, host computer 3 plots the projectile's posture at time t1. At time t2, the process repeats, and the host computer calculates the projectile's posture and spatial position.

[0033] According to the infrared laser on-off frequency T and the total time t of the projectile's movement in the photodiode array 202, t×T frames of images recording the projectile's spatial position and posture can be obtained, and the projectile's speed and trajectory can be further calculated.

[0034] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0035] It is obvious to those skilled in the art that the embodiments of the present invention are not limited to the details of the above-mentioned exemplary embodiments, and that the embodiments of the present invention can be implemented in other specific forms without departing from the spirit or essential features of the embodiments of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the embodiments of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the embodiments of the present invention. Any figure marks in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units, modules or devices stated in the system, device or terminal claims may also be implemented by the same unit, module or device through software or hardware. Words such as first and second are used to indicate names and do not indicate any particular order.

[0036] Finally, it should be noted that the above implementation methods are only used to illustrate the technical solutions of the embodiments of the present invention and are not limiting. Although the embodiments of the present invention are described in detail with reference to the above preferred implementation methods, ordinary technicians in this field should understand that the technical solutions of the embodiments of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ballistic imaging method based on infrared laser, characterized in that: In the method, the infrared laser emitting module (1) is composed of a power supply (101), an infrared laser beam array (102), a scattering mirror (103), a collimating mirror (104), and a housing (105); the receiving module (2) is composed of a bandpass filter (201), a photodiode array (202), an outer frame (203), and a data interface (204); The infrared laser beam array (102) emits multiple infrared laser beams, and through the action of the scattering mirror (103) and the collimating mirror (104), the multiple independent infrared laser beams form an infrared laser column that can completely cover the photodiode array (202); the bandpass filter (201) on the receiving module (2) can transmit light waves with wavelengths within the infrared light range; the photodiode array (202) receives the infrared signal and forms a path, and the host computer (3) records the power-on status of each photodiode on the photodiode array (202); When the bullet passes through the experimental target plate and moves to the infrared laser area, the projectile blocks part of the infrared laser, and the photodiode at the corresponding position of the photodiode array (202) has no light signal. Combined with the spatial position of the photodiode on the photodiode array (202), the host computer (3) can draw the posture and spatial position of the projectile at different times.

2. The ballistic imaging method based on infrared laser according to claim 1, characterized in that: According to the infrared laser on-off frequency T and the total time t of the projectile moving in the photodiode array (202), t×T frames of images recording the projectile's spatial position and posture can be obtained, and the projectile's speed and projectile's motion trajectory can be further calculated.

3. The ballistic imaging method based on infrared laser according to claim 1, characterized in that: In the infrared laser emitting module (1), a power supply (101), an infrared laser beam array (102), a scattering mirror (103) and a collimating mirror (104) are fixed in sequence in a housing (105); the power supply (101) is connected to the infrared laser beam array (102) and serves as a power input port for the infrared laser beam array (102); the scattering mirror (103) is located in front of the emission end of the infrared laser beam array (102), and the collimating mirror (104) is located behind the scattering mirror; and an optimal distance exists between the scattering mirror (103) and the collimating mirror (104) of the infrared laser beam array (102), which is adjusted according to the size of the infrared laser beam array.

4. The ballistic imaging method based on infrared laser according to claim 1, characterized in that: In the receiving module (2), the outer frame (203) is a metal box-shaped shell with an opening on one side; the photodiode array (202) is located in a cavity surrounded by the outer frame (203); the photosensitive element faces the opening direction of the outer frame (203); the bandpass filter (201) covers the opening of the outer frame (203) to form a sealed environment; the photodiode array (202) is composed of an integrated circuit and photodiodes, and the square photodiodes are arranged closely in a matrix to form a photodiode array.

5. The infrared laser-based ballistic imaging method according to any one of claims 1 to 3, characterized in that: The data interface (204) is connected to the photodiode array (202) and sends the signal collected by the photodiode array (202) to the host computer (3).

6. A ballistic imaging system based on infrared laser, comprising: An infrared laser emitting module (1), a receiving module and a host computer; wherein the infrared laser emitting module (1) is composed of a power supply (101), an infrared laser beam array (102), a scattering mirror (103), a collimating mirror (104) and a housing (105); the receiving module (2) is composed of a bandpass filter (201), a photodiode array (202), an outer frame (203) and a data interface (204), characterized in that the infrared laser beam array (102) in the system emits multiple infrared laser beams, and through the action of the scattering mirror (103) and the collimating mirror (104), the multiple independent infrared laser beams form an infrared laser column that can completely cover the photodiode array (202); the bandpass filter (201) on the receiving module (2) can transmit light waves with wavelengths within the infrared light range; the photodiode array (202) receives the infrared signal to form a path, and the host computer (3) records the power-on status of each photodiode on the photodiode array (202); When the bullet passes through the experimental target plate and moves to the infrared laser area, the projectile blocks part of the infrared laser, and the photodiode at the corresponding position of the photodiode array (202) has no light signal. Combined with the spatial position of the photodiode on the photodiode array (202), the host computer (3) can draw the posture and spatial position of the projectile at different times.

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