Device and method for testing initial speed and distribution of warhead fragments

Abstract

The invention discloses a device and a method for testing initial velocity and distribution of fragments of a warhead, and the device is characterized in that a missile rack is arranged in a light filtering protection device, and is used for fixedly installing the warhead; the light filtering protection device is arranged between the high-speed camera laying room and the anti-reflection background, located on one side of the lens axis of the high-speed camera and used for enabling fragments generated by warhead explosion to penetrate through the space between the high-speed camera laying room and the anti-reflection background to shield explosion fire light and detonation products. The phenomenon that the lens of the high-speed camera is covered in the light curtain area of the explosion flame to cause overexposure is avoided, so that fragment flying images can be shot at a short distance. According to the testing device, explosion fire light is weakened through the light filtering protection device, the concentration of detonation products flying along with fragments is reduced, and therefore the fragment scattering process can be shot at a short distance, axial distribution of the initial speed of the fragments is directly calculated, and the fragment scattering angle is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of fragment dynamic testing, and particularly relates to a device and method for testing the initial velocity and distribution of warhead fragments. Background Art

[0002] In order to obtain the initial velocity of fragments, in experiments, high-speed photography is usually used to record the firelight when the fragments impact the target plate, or a through-target or a large number of broken targets are used to record the time signal when the fragments penetrate the target, and the time value when the fragment group reaches a certain distance is measured. At the same time, in the experiment, as many fragments as possible are recovered without damage, the ballistic gun test is carried out on the recovered fragments to measure the fragment velocity attenuation coefficient, and the approximate value of the initial velocity of the fragments is inversely deduced according to the average time and the average attenuation coefficient. This method indirectly measures the initial velocity of the fragments, and the cumulative error is relatively large.

[0003] At present, the methods for directly measuring the initial velocity of fragments include high-speed photography combined with pulsed laser light sources, laser interferometry velocimetry (VISAR) technology, and pulsed X-ray photography technology. Among them, both the laser high-speed photography and the laser interferometry velocimetry systems use laser as the information carrier, and they are greatly interfered by detonation products and thick smoke. Therefore, they can only measure the initial velocity of fragments when the detonation products decay to a relatively low concentration, and there are still certain errors. The pulsed X-ray photography technology has the disadvantage of fewer single-shot frames compared with the high-speed photography technology.

[0004] Traditional high-speed photography systems mostly use protective steel casings with windows, and their optical observation windows are usually equipped with multiple layers of composite bulletproof glass. Affected by the material thickness and layered structure, significant optical path differences will occur when light waves penetrate multiple media, triggering multiple reflection effects, and finally forming a double-image superposition phenomenon in the high-speed photography system. This optical distortion is manifested as characteristic image blurring and ghosting during high-speed photography. Moreover, in high-energy and strong-light scenarios such as detonation experiments, due to the exponential growth of the incident light intensity, the optical path distortion effect will be further amplified, greatly reducing the shooting quality. Therefore, it is urgent to improve the protective steel casing, which can not only eliminate the interference of glass mirror reflection but also protect the high-speed camera.

[0005] Traditional high-speed photography technology can obtain multiple photos at one time and is relatively inexpensive, but it is usually limited by the shooting environment and the matching between the light intensity of the object to be photographed and the photosensitive device of the high-speed camera. When the high-speed camera takes pictures at a position close to the detonation point, the explosion firelight and thick smoke will instantly obscure the fragments, making it difficult to capture the fragment images; when taking pictures at a position far from the detonation point, the requirements for the shooting environment light are relatively high, and the factor of fragment velocity attenuation needs to be considered at a long distance, and the initial velocity of the fragments cannot be directly calculated. Summary of the Invention

[0006] The present invention provides a device and a method for testing the initial velocity and distribution of fragments of a warhead. The device weakens the explosion firelight and reduces the concentration of detonation products accompanying the fragments through a light-filtering protection device, so that the process of fragment scattering can be photographed at a close distance, and the axial distribution of the initial velocity of the fragments can be directly calculated and the fragment scattering angle can be obtained.

[0007] To achieve the above object, the present invention adopts the following specific technical solutions:

[0008] The present invention provides a device for testing the initial velocity and distribution of fragments of a warhead. The device includes a high-speed camera deployment room, a light-filtering protection device, an anti-reflection background, and a warhead rack;

[0009] The high-speed camera deployment room is disposed opposite to the anti-reflection background; a high-speed camera is arranged in the high-speed camera deployment room, the lens of the high-speed camera faces the anti-reflection background and the axis of the lens is arranged horizontally; the warhead rack is arranged in the light-filtering protection device and is used for fixedly installing the warhead.

[0010] The light-filtering protection device is arranged between the high-speed camera deployment room and the anti-reflection background and on one side of the axis of the lens of the high-speed camera, and is used to enable the fragments generated by the explosion of the warhead to pass through between the high-speed camera deployment room and the anti-reflection background, block the explosion firelight and detonation products, and avoid overexposure of the lens of the high-speed camera being covered in the light curtain area of the explosion firelight, so as to realize photographing the fragment scattering image at a close distance.

[0011] Furthermore, the light-filtering protection device includes a fragment protection cover, a rectangular interface, a light filter, a light-shielding cover, and an adjustable light filter;

[0012] The fragment protection cover, the rectangular interface, the light filter, and the light-shielding cover are connected in sequence, and the adjustable light filter is clamped between the light filter and the light-shielding cover;

[0013] A first rectangular hole is provided at the center position on one side of the fragment protection cover facing the high-speed camera deployment room and the anti-reflection background; a second rectangular hole is provided in the rectangular interface; a rectangular light-filtering hole is provided in the light filter; a third rectangular hole is provided in the adjustable light filter; a fourth rectangular hole is provided in the light-shielding cover;

[0014] The first rectangular hole, the second rectangular hole, the rectangular light-filtering hole, the third rectangular hole, and the fourth rectangular hole are arranged opposite to each other in sequence.

[0015] Furthermore, the fragment protection cover is welded by a front panel, a top panel, and two side panels;

[0016] The front panel is arranged vertically and parallel to the axis of the lens; the first rectangular hole is arranged at the center position of the front panel, and the rectangular interface is fixedly connected thereto.

[0017] The two side panels are arranged obliquely vertically and symmetrically distributed on both sides of the front panel.

[0018] The top panel is arranged horizontally and overlaps on the tops of the side panels and the front panel.

[0019] The materials of the front panel, the top panel and the side panels are all steel.

[0020] The cartridge rack is arranged on the ground below the top panel.

[0021] Furthermore, the rectangular interface is connected to the front panel by bolts; the rectangular interface is connected to the filter and the filters are connected by plugging in slots; the light-shielding cover is snap-fitted to the filter.

[0022] Furthermore, the horizontal distance between the front panel and the cartridge rack is 8-10 times the charge caliber.

[0023] The horizontal distance between the axis of the lens of the high-speed camera and the cartridge rack is 35-40 times the charge caliber.

[0024] Furthermore, the size of the fourth rectangular hole is 1.5-2.5 times the size of the fragment; the size of the second rectangular hole is the same as that of the first rectangular hole and they are arranged opposite to each other.

[0025] Furthermore, the material of the adjustable filter is cardboard.

[0026] Furthermore, the filter protection device includes at least two filters connected in sequence.

[0027] Along the direction from the fragment protection cover to the light-shielding cover, the rectangular filter holes decrease in sequence.

[0028] Furthermore, the high-speed camera deployment room includes a protective steel enclosure and protective steel plates.

[0029] The protective steel enclosure is provided with an optical observation window on the side facing the anti-reflection background, and the optical observation window uses single-layer bulletproof glass.

[0030] The protective steel plates are installed on the side of the protective steel enclosure facing the filter protection device through an adjustable angle limiting mechanism and a hinged door shaft mechanism.

[0031] In addition, the present invention also provides a method for testing the initial velocity and distribution of warhead fragments by using the above device, and the method includes the following steps:

[0032] Step 1: Fix the warhead on the bomb rack and place it in the light filtering protection device.

[0033] Step 2: Start the high-speed camera and set the shooting frequency, shutter speed, and resolution.

[0034] Step 3: Detonate the warhead. The single-row fragments pass through the light filtering protection device, and the remaining fragments and detonation products are intercepted and filtered by the light filtering protection device. The flight process of the fragments is photographed by the high-speed camera.

[0035] Step 4: Process the images taken by the high-speed camera to obtain the initial velocity and scattering information of the fragments.

[0036] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0037] The test device of the present invention restricts the irradiation angle and range of the explosion firelight through the light filtering protection device, avoiding overexposure of the high-speed camera lens covered in the light curtain area of the explosion firelight, and providing sufficient light intensity for the fragments to facilitate shooting. In the initial stage of the warhead explosion driving the fragments to scatter, the detonation products overflow from the gaps between the fragments, forming a high-brightness detonation product particle cloud around the fragments, making it difficult to photograph the fragment images with high-speed photography. Since the velocity attenuation of the detonation product particles is faster than that of the fragments, after the fragments fly a certain distance, they will fly out of the detonation product particle group and separate from the detonation products. The light filtering protection device can accelerate the process of fragment separation from the detonation products by restricting the diffusion flow rate of the detonation products, so as to realize the close-range shooting of the fragment scattering images.

[0038] The present invention uses a light filtering protection device to optimize the traditional high-speed photography technology, which is relatively inexpensive, can obtain multiple photos at a time, has low requirements for natural light conditions, and can capture clear single-row fragment scattering images, providing an efficient and inexpensive test method for obtaining the fragment scattering angle and initial velocity.

[0039] On the basis of the traditional protective steel ladle, a protective steel plate is added to the incident side of the explosion source in the high-speed camera deployment room. The protective steel plate realizes dynamic connection with the protective steel ladle through a hinged door shaft mechanism, and forms a multi-stage protection posture of 90° - 150° in cooperation with the adjustable angle limit mechanism, which can effectively resist the metal fragments generated by the explosion. Under the guarantee of this protection efficiency, its optical observation window can use a single-layer bulletproof glass and reduce the thickness to eliminate the interference of glass mirror reflection. Description of the Drawings

[0040] Figure 1 It is the layout diagram of the device for testing the initial velocity and distribution of the warhead fragments of the present invention;

[0041] Figure 2 It is the side view of the light filtering protection device;

[0042] Figure 3Top view of the filter protection device;

[0043] Figure 4 Isometric view of the filter protection device;

[0044] Figures 5a - 5f Schematic structural diagram of each component in the filter protection device;

[0045] Figure 6 Schematic working diagram of the filter protection device;

[0046] Figure 7a Schematic diagram of separating fragments from detonation products in the prior art

[0047] Figure 7b Schematic diagram of separating fragments from detonation products when using the filter protection device of the present invention.

[0048] Reference numerals: 1 - High-speed camera deployment room, 2 - Filter protection device, 3 - Anti-reflection background, 4 - Initiation point, 5 - Detonation products, 6 - Fragments, 1-1 - Protection steel plate, 2-1 - Fragment protection cover, 2-2 - Rectangular interface, 2-3 - First filter, 2-4 - Second filter, 2-5 - Light-shielding cover, 2-6 - Adjustable filter, 2-2-1 - Second rectangular hole, 2-3-1 - First rectangular filter hole, 2-4-1 - Second rectangular filter hole, 2-5-1 - Fourth rectangular hole, 2-6-1 - Third rectangular hole. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] The test device and method of the present invention weaken the explosion firelight through the filter protection device 2 and reduce the concentration of detonation products 5 accompanying the flight of fragments 6, so that the process of fragment 6 scattering can be photographed at close range, the axial distribution of the initial velocity of the fragments can be directly calculated, and the scattering angle Ω of the fragments 6 can be obtained.

[0051] Embodiment 1

[0052] As Figure 1 Shown in the structure, this embodiment provides a device for testing the initial velocity and distribution of warhead fragments. The device includes a high-speed camera deployment room 1, a filter protection device 2, an anti-reflection background 3, and a projectile rack, wherein:

[0053] The high-speed camera deployment room 1 is disposed opposite to the anti-reflection background 3, and the high-speed camera deployment room 1 is located Figure 1On the left side of the middle page, the anti-reflection background 3 is located Figure 1 On the right side of the middle page, the light-filtering protection device 2 is located at the rear between the high-speed camera placement room 1 and the anti-reflection background 3; a high-speed camera for shooting is arranged in the high-speed camera placement room 1, the lens of the high-speed camera faces the side of the anti-reflection background 3, the axis of the lens is arranged horizontally and is perpendicular to the vertical plane; the horizontal distance between the axis of the lens of the high-speed camera and the projectile rack is 35-40 times the charge caliber. The projectile rack is arranged in the light-filtering protection device 2 and is used for fixedly installing the warhead.

[0054] The light-filtering protection device 2 is arranged between the high-speed camera placement room 1 and the anti-reflection background 3 and on one side of the axis of the lens of the high-speed camera, so that the fragments 6 generated by the explosion of the warhead can pass through between the high-speed camera placement room 1 and the anti-reflection background 3, block the explosion firelight and detonation products 5, and avoid overexposure of the lens of the high-speed camera being covered in the light curtain area of the explosion firelight, so as to realize close-range shooting of the scattered image of the fragments 6.

[0055] As Figure 2 、 Figure 3 and Figure 4 shown, the light-filtering protection device 2 includes a fragment protection cover 2-1, a rectangular interface 2-2, a light filter, a light-shielding cover 2-5 and an adjustable light filter 2-6; one, two or more light filters can be arranged; when only one light filter is arranged, the light filter is installed between the rectangular interface 2-2 and the light-shielding cover 2-5; when two light filters are arranged, as Figure 2 shown, the two light filters are respectively a first light filter 2-3 and a second light filter 2-4, the left end of the first light filter 2-3 is installed on the rectangular interface 2-2, the right end is connected to the left end of the second light filter 2-4, and the right end of the second light filter 2-4 is connected to the light-shielding cover 2-5; when three or more light filters are arranged, the light filters are connected in sequence from left to right, the leftmost light filter is connected to the rectangular interface 2-2, and the rightmost light filter is connected to the light-shielding cover 2-5. In this embodiment, the case of arranging two light filters at the same time is taken as an example for illustration. When the light-filtering protection device 2 is provided with at least two light filters, along the direction from the fragment protection cover 2-1 towards the light-shielding cover 2-5, the rectangular light-filtering holes gradually decrease, and the light filters can effectively weaken the concentration of the overflow of the detonation products 5 by means of stepwise reducing the rectangular light-filtering holes. The size of the light filter is determined by the size of the front connecting body, and multiple light filters can be assembled according to the charge caliber of the warhead and the size of the fragments 6, and the light filters are connected by plugging.

[0056] As Figure 2As shown in the figure, the fragment shield 2-1, rectangular interface 2-2, first filter 2-3, second filter 2-4, and light-shielding cover 2-5 are connected in sequence from left to right. The adjustable filter 2-6 is clamped between the second filter 2-4 and the light-shielding cover 2-5, and the material of the adjustable filter 2-6 is cardboard. The rectangular interface 2-2 is bolted to the front panel. The rectangular interface 2-2 is connected to the filter and the filters are connected by plugging into slots. That is, the rectangular interface 2-2 is provided with slots on the side facing the first filter 2-3, and the first filter 2-3 is provided with slots on the side facing the second filter 2-4. The first filter 2-3 is provided with insertion plates on the side facing the rectangular interface 2-2 and the second filter 2-4 is provided with insertion plates on the side facing the first filter 2-3. The installation of the filter is achieved through the plugging fit of the corresponding insertion plates and slots. The light-shielding cover 2-5 is snap-fitted to the last filter, that is, the light-shielding cover 2-5 is snap-fitted to the second filter 2-4. The light-shielding cover 2-5 is provided with a card slot on the side facing the second filter 2-4. The light-shielding cover 2-5 is snap-fitted to the side of the second filter 2-4 facing away from the first filter 2-3, and at the same time, the adjustable filter 2-6 is pressed against the second filter 2-4. The second filter 2-4 is provided with a limit rib on the side facing the light-shielding cover 2-5 for limiting the light-shielding cover 2-5. The size of the opening of the light-shielding cover 2-5 is determined by the size of the filter it is connected to.

[0057] The fragment shield 2-1 is provided with a first rectangular hole at the central position on the side facing the high-speed camera deployment room 1 and the anti-reflection background 3. As Figure 5a shown, the rectangular interface 2-2 is a flange structure and is provided with a second rectangular hole 2-2-1. As Figure 5b shown, the first filter 2-3 is provided with a first rectangular filter hole 2-3-1. As Figure 5c shown, the second filter 2-4 is provided with a second rectangular filter hole 2-4-1. As Figure 5d shown, the adjustable filter 2-6 is provided with a third rectangular hole 2-6-1. As Figure 5e and Figure 5f shown, the light-shielding cover 2-5 is provided with a fourth rectangular hole 2-5-1, and the size of the fourth rectangular hole 2-5-1 is 1.5 - 2.5 times the size of the fragment 6. The first rectangular hole, the second rectangular hole 2-2-1, the rectangular filter hole, the third rectangular hole 2-6-1, and the fourth rectangular hole 2-5-1 are arranged opposite to each other in sequence to form a channel for the single-row flight of the fragment 6. The size of the fourth rectangular hole 2-5-1 is 1.5 - 2.5 times the size of the fragment 6. The size of the second rectangular hole 2-2-1 is the same as that of the first rectangular hole and they are arranged opposite to each other.

[0058] The fragment shield 2-1 is composed of a front panel, a top panel, and two side panels welded together; the front panel is arranged vertically and parallel to the axis of the lens; the horizontal distance between the front panel and the projectile rack is 8-10 times the charge caliber; a first rectangular hole is provided at the center of the front panel, and a rectangular interface 2-2 is fixedly connected; the height of the first rectangular hole is determined by the projectile rack, and the length and width of the first rectangular hole are determined by the length of the projectile and the size of the fragment 6 respectively. The two side panels are arranged obliquely vertically and symmetrically distributed on both sides of the front panel; the top panel is arranged horizontally and overlaps the tops of the side panels and the front panel; the materials of the front panel, the top panel, and the side panels are all steel; the projectile rack is arranged on the ground below the top panel.

[0059] To further improve the shooting effect, as Figure 1 shown, the high-speed shooting deployment room 1 includes a protective steel container and a protective steel plate 1-1; the protective steel container is provided with an optical observation window on the side facing the anti-reflection background, and the optical observation window uses single-layer bulletproof glass; the protective steel plate 1-1 is installed on the side of the protective steel container facing the filter protection device 2 through an adjustable angle limit mechanism and a hinged door shaft mechanism.

[0060] Based on the traditional protective steel container, the high-speed shooting deployment room 1 adds a protective steel plate 1-1 on the incident side of the explosion source. The protective steel plate 1-1 realizes dynamic connection with the protective steel container through a hinged door shaft mechanism, and cooperates with the adjustable angle limit mechanism to form a multi-level protection posture of 90°-150°, which can effectively resist the metal fragments generated by the explosion. Under the guarantee of this protection efficiency, its optical observation window can use single-layer bulletproof glass and reduce the thickness, so as to eliminate the interference of glass mirror reflection.

[0061] The working process of the above test device is as follows: in the static explosion test, the filter protection device 2 can shield most of the circumferential fragments 6, only allowing a single row of fragments 6 aligned with the front panel to fly out, blocking the instantaneous firelight of the explosion and weakening the concentration of the detonation products 5 accompanying the flight of the fragments 6. After the detonation products 5 are filtered by the filter holes, the adjustable filter 2-6, and the light-shielding cover 2-5, their concentration decreases and the brightness attenuates significantly. As Figure 7b shown, after the warhead detonates at the detonation point 4, the filter protection device 2 blocks the detonation products 5 on the side far from the lens. The fragments 6 are separated from the detonation products 5 after passing through the filter protection device 2, while Figure 7a in, due to the absence of the filter protection device 2, after the warhead detonates at the detonation point 4, the fragments 6 are submerged in the detonation products 5. It can avoid overexposure of the camera's photosensitive device and at the same time provide sufficient light intensity to meet the requirement of the high-speed camera for taking clear images.

[0062] The scattering angle of the explosion firelight is determined by the rectangular hole size of the adjustable filter 2-6 and the distance between the adjustable filter 2-6 and the detonation point 4. The rectangular interface 2-2 serves to lengthen the distance from the adjustable filter 2-6 to the detonation point 4 and to install the filter. The light-shielding cover 2-5 is used to fix the adjustable filter 2-6, and the adjustable filter 2-6 with a suitable size can be replaced according to the test conditions.

[0063] Embodiment 2

[0064] This embodiment provides a method for testing the initial velocity and distribution of warhead fragments using the above test device. The method includes the following steps:

[0065] Step 1: Fix the warhead on the bomb rack and place it in the filter protection device 2, and align the flying direction of the single-row fragments 6 of the warhead with the rectangular interface 2-2;

[0066] Step 2: Start the high-speed camera and set the shooting frequency, shutter speed, and resolution;

[0067] Step 3: Detonate the warhead. The single-row fragments 6 pass through the filter protection device 2, and the remaining fragments 6 and detonation products 5 are intercepted and filtered by the filter protection device 2. The flying process of the fragments 6 is photographed by the high-speed camera;

[0068] Step 4: Use the data processing system to process the images photographed by the high-speed camera to obtain the initial velocity and scattering information of the fragments 6, so that the scattering process of the fragments 6 can be photographed at a close distance, the axial distribution of the initial velocity of the fragments 6 can be directly calculated, and the scattering angle Ω of the fragments 6 can be obtained, as Figure 6 shown.

[0069] Among them, the calculation formula for the initial velocity of the fragment is:

[0070] v i = ΔR i / Δt;

[0071] Among them: v i is the initial velocity of the i-th single-row fragment 6, with the unit of m / s; ΔR i is the distance moved by the i-th single-row fragment 6 in two adjacent frames of images, with the unit of m; Δt is the shooting time interval of the high-speed camera, with the unit of s.

[0072] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A device for testing the initial velocity and distribution of warhead fragments, characterized in that: Includes high-angle camera placement room, light filter protection device, anti-reflective background and bomb rack; The high-speed camera placement room is arranged opposite to the anti-reflection background; a high-speed camera is arranged in the high-speed camera placement room, the lens of the high-speed camera faces the anti-reflection background and the axis of the lens is arranged in the horizontal direction; the bomb rack is arranged in the filter protection device, and is used for fixing and installing the warhead; The light filtering protection device is arranged between the high-speed camera placement room and the anti-reflection background and is located on one side of the lens axis of the high-speed camera. It is used to allow the fragments generated by the warhead explosion to pass through between the high-speed camera placement room and the anti-reflection background, shield the explosion fire and detonation products, and avoid overexposure of the lens of the high-speed camera due to being covered in the light curtain area of ​​the explosion fire, so as to achieve close-range shooting of the fragmentation image.

2. The device according to claim 1, characterized in that The light filtering protection device comprises a fragment protection cover, a rectangular interface, a light filter, a light shielding cover and an adjustable light filter; The fragment protection cover, the rectangular interface, the optical filter and the light shielding cover are connected in sequence, and the adjustable optical filter is clamped between the optical filter and the light shielding cover; The fragment protection cover is provided with a first rectangular hole at the center of one side facing the high-speed camera placement room and the anti-reflection background; the rectangular interface is provided with a second rectangular hole; the filter is provided with a rectangular filter hole; the adjustable filter is provided with a third rectangular hole; the light shielding cover is provided with a fourth rectangular hole; The first rectangular hole, the second rectangular hole, the rectangular filter hole, the third rectangular hole and the fourth rectangular hole are arranged opposite to each other in sequence.

3. The device according to claim 2, characterized in that The fragment protection cover is welded by a front panel, a top panel and two side panels; The front panel is arranged in the vertical direction and is parallel to the axis of the lens; the first rectangular hole is arranged at the center of the front panel and is fixedly connected with the rectangular interface; The two side panels are arranged obliquely along the vertical direction and are symmetrically distributed on both sides of the front panel; The top plate is arranged in the horizontal direction and overlapped on the top of the side plate and the front plate; The front panel, the top panel and the side panels are all made of steel; The bomb rack is arranged on the ground below the top plate.

4. The device according to claim 3, characterized in that The rectangular interface is connected to the front panel by bolts; the rectangular interface and the optical filter, as well as the optical filters, are plug-in connected by slots; and the light shielding cover is snap-connected to the optical filter.

5. The device according to claim 3, characterized in that The horizontal distance between the front plate and the bomb rack is 8-10 times the caliber of the charge; The horizontal distance between the lens axis of the high-speed camera and the bomb rack is 35-40 times the charge caliber.

6. The device according to claim 2, characterized in that The size of the fourth rectangular hole is 1.5-2.5 times the size of the fragment; The second rectangular hole has the same size as the first rectangular hole and is arranged opposite to the first rectangular hole.

7. The device according to claim 2, characterized in that The adjustable filter is made of cardboard.

8. The device according to any one of claims 2 to 7, characterized in that The light filtering protection device comprises at least two filters connected in sequence; The rectangular filter holes decrease in size in a direction from the fragment protection cover toward the light shielding cover.

9. The device according to any one of claims 1 to 8, characterized in that The high-angle camera placement room includes a protective steel ladle and a protective steel plate; The protective ladle is provided with an optical observation window on the side facing the anti-reflection background, and the optical observation window is made of single-layer bulletproof glass; The protective steel plate is installed on the side of the protective steel ladle facing the light filtering protective device through an adjustable angle limiting mechanism and an articulated door shaft mechanism.

10. A method for testing the initial velocity and distribution of warhead fragments using the device described in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: fix the warhead on the bomb rack and place it in the light filter protection device; Step 2: Start the high-speed camera and set the shooting frequency, shutter speed and resolution; Step 3: detonate the warhead, a single row of fragments passes through the light filtering protection device, and the remaining fragments and detonation products are intercepted and filtered by the light filtering protection device, and the flight process of the fragments is filmed by a high-speed camera; Step 4: Process the images taken by the high-speed camera to obtain the initial velocity and dispersion information of the fragments.

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