An optical testing device and method for detonation pressure of micro-quantity powdered explosives

Abstract

This invention provides an optical testing device for detonation pressure of small-quantity powdered explosives, comprising a rotating mirror scanning camera and an explosive detonation unit. The rotating mirror scanning camera is used to acquire images of the shock wave trajectory during the detonation of the powdered explosive. The explosive detonation unit includes an acrylic column and a high-pressure detonator. An open-top charging hole is arranged axially within the acrylic column, and a stress wave adjusting rod passes through the charging hole, the bottom surface of which can contact the powdered explosive loaded into the charging hole. A first detonation hole and a second detonation hole are also arranged radially and coaxially within the acrylic column, both communicating with the charging hole. A heating wire passing through the first detonation hole, the charging hole, and the second detonation hole can contact the powdered explosive within the charging hole, and the two ends of the heating wire are respectively connected to the positive and negative terminals of the high-pressure detonator. This invention eliminates the need for traditional detonation methods, solving the interference of detonators and proppant charges on the measurement process of small-quantity samples, and improving the convenience and accuracy of the experiment.

Description

Technical Field

[0001] This invention belongs to the field of laboratory measurement technology for explosives, and relates to an optical testing device and method for detonation pressure of small-quantity powdered explosives. Background Technology

[0002] Detonation pressure (or CJ detonation pressure) is the pressure at the head of the detonation wave after an explosive detonates. Its value represents the initial and maximum pressure of the detonation products, reflecting the detonation intensity and serving as a core parameter characterizing the detonation performance of an explosive. Therefore, obtaining accurate detonation pressure values ​​is crucial for the optimized design of explosive materials during the development of various novel explosives.

[0003] Currently, methods for measuring the detonation pressure of explosives mainly include optical scanning measurement based on a super-rotating mirror scanning camera, manganese-copper measurement based on a manganese-copper pressure sensor, and laser interferometry measurement based on a laser interferometer particle velocity meter. These methods all have corresponding national military standards, but all require the explosive sample to have a charge of several hundred grams. For example, the manganese-copper measurement method requires the explosive sample to be Φ50×100mm in size and have a charge exceeding 300g; the optical scanning measurement method—water tank method—requires the explosive sample to be Φ60×65mm in size and have a charge exceeding 300g. However, in the synthesis and development of new high-energy explosives, due to immature synthesis processes, mass production is not possible, and the amount of explosive samples that can be provided is generally in the gram range or even less, which cannot meet the charge requirements of existing detonation pressure measurement methods. Furthermore, new explosives are quite sensitive and cannot be prepared into specific shapes such as cylinders through pressing or casting; they are generally in their initial powder form.

[0004] When the charge of a new type of explosive sample is reduced to less than 1g, its detonation pressure measurement will face the following challenges: In traditional detonation methods, the combined charge of the detonator and the expanding explosive will significantly exceed that of the sample being tested. The measurement result is due to the coupling of these three components, which will lead to a significant increase in the deviation of the measurement result and make it difficult to accurately characterize the true detonation pressure value of the sample being tested; The sample volume is too small, and existing measurement methods will result in large deviations in the measurement data, making them no longer applicable; Powdered explosives are difficult to precisely shape, which cannot meet the high-precision deployment requirements in existing measurement standards.

[0005] In summary, there is an urgent need to design a detonation pressure measurement method suitable for small amounts of powdered explosives, so as to meet the measurement requirements in the synthesis and development of new explosives. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an optical testing device and method for detonation pressure of small-quantity powdered explosives, thereby solving the technical problem of the lack of a measuring device capable of reliably initiating and accurately deploying small-quantity explosives.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] An optical testing device for detonation pressure of a small amount of powdered explosive includes a rotating mirror scanning camera and an explosive detonation unit. The rotating mirror scanning camera is used to acquire images of the shock wave trajectory during the detonation of the powdered explosive.

[0009] The explosive detonation unit includes an organic glass cylinder and a high-pressure detonator. The organic glass cylinder has an axially arranged top-open charging hole. A stress wave adjusting rod is inserted into the charging hole, and the bottom surface of the stress wave adjusting rod can contact the powdered explosive loaded into the charging hole.

[0010] The organic glass cylinder is also provided with a first detonation hole and a second detonation hole along the radial direction and coaxially, and both the first detonation hole and the second detonation hole are connected to the charging hole; the heating wire passing through the first detonation hole, the charging hole and the second detonation hole can contact the powdered explosive in the charging hole, and the two ends of the heating wire are respectively connected to the positive and negative poles of the high-pressure detonator.

[0011] The present invention also has the following technical features:

[0012] Specifically, the organic glass column is provided with a first light-transmitting surface and a second light-transmitting surface on its left and right sides, respectively.

[0013] Furthermore, the first and second light-transmitting surfaces have the same structure and are arranged in a mirror-symmetrical manner, and the ratio of the width of the first light-transmitting surface to the diameter of the plexiglass column is (0.2~0.5):1.

[0014] Furthermore, it also includes a pulsed light source, which faces the second light-transmitting surface, while the image acquisition end of the rotating mirror scanning camera faces the first light-transmitting surface.

[0015] Furthermore, the distance between the axis of the first detonation hole and the bottom surface of the charging hole is 3 to 10 mm, and the diameter of the first detonation hole is 0.5 to 1.5 mm.

[0016] Furthermore, the diameter of the charging hole is 3-10 mm, and the ratio of the depth of the charging hole to the height of the plexiglass column is (0.2-0.5):1.

[0017] Furthermore, the plexiglass column is also provided with a first vibration isolation hole and a second vibration isolation hole coaxially along the radial direction. The first vibration isolation hole is located directly below the first detonation hole, and the second vibration isolation hole is located directly below the second detonation hole. The first vibration isolation hole and the second vibration isolation hole have the same structure and are arranged in a mirror image symmetrical arrangement. The diameter ratio of the first vibration isolation hole to the first detonation hole is (2~4):1, and the distance between the axis of the first vibration isolation hole and the axis of the first detonation hole is 2~6mm.

[0018] Furthermore, the heating wire includes aluminum heating wire and nickel-chromium alloy heating wire.

[0019] Furthermore, the stress wave adjusting rod is made of aluminum alloy, and the diameter of the stress wave adjusting rod is 0.02 to 0.2 mm smaller than the diameter of the charging hole, and the ratio of the length of the stress wave adjusting rod to the depth of the charging hole is (1.0 to 1.3):1.

[0020] This invention also protects an optical testing method for detonation pressure of small-quantity powdered explosives. This method is implemented using the aforementioned optical testing device for detonation pressure of small-quantity powdered explosives, and specifically includes the following steps:

[0021] Step 1: Set up an optical testing device for detonation pressure of small-quantity powdered explosives in an explosion-proof laboratory or explosion-proof container, so that the plexiglass cylinder and the pulsed light source are on the optical axis of the rotating mirror scanning camera, and the center line of the first light-transmitting surface is within the field of view of the rotating mirror scanning camera, and the upper edge of the field of view of the rotating mirror scanning camera and the bottom surface of the charging hole are in the same plane.

[0022] Step 2: Connect the two ends of the heating wire to the positive and negative terminals of the high-voltage detonator, respectively;

[0023] Step 3: The rotating mirror scanning camera starts up and gradually reaches the set rotation speed, triggering the high-voltage detonator and pulsed light source; after the high-voltage detonator is triggered, the heating wire explodes electrically, detonating the explosive sample and forming a shock wave inside the plexiglass cylinder; the rotating mirror scanning camera obtains the trajectory image of the shock wave head within the plexiglass cylinder.

[0024] Step 4: Determine the displacement change curve of the shock wave based on the obtained motion trajectory image;

[0025] Step 5: Use the least squares method to fit the numerical values ​​of the shock wave displacement change curve to obtain the fitting parameters of the shock wave displacement change curve.

[0026] Step 6: Determine the initial velocity of the shock wave and the initial particle velocity based on the obtained fitting parameters;

[0027] Step 7: Determine the detonation pressure of the powdered explosive based on the initial velocity of the shock wave and the initial particle velocity.

[0028] Compared with the prior art, the beneficial technical effects of this invention are:

[0029] This invention eliminates the need for traditional detonation methods using detonators and extended explosives, solving the interference problem caused by these methods in the measurement of small-volume samples. This significantly improves the convenience and accuracy of the experiment. In particular, the design of the loading hole addresses the issue of the inability to precisely shape powdered explosives, which affects the layout of the optical experimental space. The inclusion of a light-transmitting plane avoids light reflection from the curved surface of the plexiglass cylinder, thus reducing interference sources in the image. The vibration isolation hole design isolates the stress waves generated by the heating wire explosion from interfering with the stress waves generated by the explosive sample explosion. The stress wave adjustment rod design reduces the energy transfer rate of the explosive sample during the initial detonation phase to other media, improving the accuracy of the measurement. This invention's device has a simple structure, is easy to use, and is worthy of widespread adoption. Attached Figure Description

[0030] Figure 1 This is a partial structural schematic diagram I of the device of the present invention;

[0031] Figure 2 This is a partial structural schematic diagram II of the device of the present invention;

[0032] Figure 3 This is a schematic diagram of the overall structure of the device of the present invention;

[0033] Figure 4 This is the motion trajectory image obtained in Embodiment 1 of the present invention;

[0034] Figure 5 This is the shock wave displacement change curve obtained in Embodiment 1 of the present invention.

[0035] The labels in the diagram represent the following: 1- Rotating mirror scanning camera, 2- Explosive detonation unit, 3- Pulse light source; 21- Acrylic glass cylinder, 22- High-pressure detonator, 23- Stress wave adjustment rod, 24- Charge hole, 25- First detonation hole, 26- Second detonation hole, 27- Heating wire, 28- First vibration isolation hole, 29- Second vibration isolation hole; 211- First light-transmitting surface, 212- Second light-transmitting surface.

[0036] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0037] The purpose of this invention is to provide an optical testing device and method for detonation pressure of small-quantity powdered explosives. Based on the optical scanning measurement method—the plexiglass method, this method can effectively solve the problems of reliable detonation and high-precision placement of small-quantity explosive samples, and can accurately obtain the detonation pressure of small-quantity powdered explosive samples, providing necessary technical support for the research and development of new explosives.

[0038] It should be noted that, unless otherwise specified, all components in this invention are those known in the prior art. "Micro-dosage" refers to a dosage of 50mg to 1g.

[0039] The high-voltage detonator used in this invention has a maximum discharge voltage of 15kV and a discharge capacitor of 20μF; the rotating mirror scanning camera is model SJZ-15; and the pulsed light source is a pulsed xenon lamp with a discharge capacitor of 1kJ, a discharge voltage of 3kV, and a discharge period of 200μs.

[0040] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0041] Example 1:

[0042] Following the above technical solutions, such as Figures 1 to 3 As shown in the figure, this embodiment provides an optical testing device for detonation pressure of a small amount of powdered explosive. The powdered explosive to be tested is octogen (HMX). Calculations show that the density of the powdered explosive after compaction within the loading hole 24 is 1.05 g / cm³. 3 .

[0043] The testing device includes a rotating mirror scanning camera 1 and an explosive detonation unit 2. The rotating mirror scanning camera 1 is used to acquire images of the shock wave trajectory during the detonation of powdered explosives.

[0044] The explosive detonation unit 2 includes an acrylic glass cylinder 21 and a high-pressure detonator 22. Preferably, the acrylic glass cylinder 21 is a cylinder with a diameter of 30-50 mm and a height of 50-70 mm. In this embodiment, the acrylic glass cylinder 21 has a diameter of 40 mm and a height of 50 mm. An open-top charging hole 24 is provided axially inside the acrylic glass cylinder 21. A stress wave adjusting rod 23 passes through the charging hole 24, and the bottom surface of the stress wave adjusting rod 23 can contact the powdered explosive loaded into the charging hole 24. The powdered explosive loaded into the charging hole 24 can be compacted, thus effectively solving the problem that the inability to precisely shape the powdered explosive affects the layout of the optical test space. The high-pressure detonator 22 is used to activate the powdered explosive, causing it to detonate.

[0045] When the powdered explosive detonates, the generated gaseous products will escape upward along the charging hole 24, causing energy to propagate into the air. The stress wave adjusting rod 23 can block the charging hole 24 to ensure that the energy propagates into the plexiglass cylinder 21.

[0046] In this embodiment, the stress wave adjusting rod 23 is preferably made of aluminum because: the impedance of aluminum is close to the impedance of the powdered explosive sample during detonation, which will not cause an increase in pressure within the charging hole 24, ensuring that only the pressure generated by the detonation of the powdered explosive sample is propagated. Therefore, the stress wave adjusting rod 23 can not only reduce the rate of energy transfer from the powdered explosive sample in the initial stage of detonation to other media, but also prevent pressure interference, thus improving the accuracy of experimental measurements.

[0047] The plexiglass cylinder 21 is also provided with a first detonation hole 25 and a second detonation hole 26 coaxially along the radial direction, and both the first detonation hole 25 and the second detonation hole 26 are connected to the charging hole 24; the heating wire 27 passing through the first detonation hole 25, the charging hole 24 and the second detonation hole 26 can contact the powdered explosive in the charging hole 24, and the two ends of the heating wire 27 are respectively connected to the positive and negative poles of the high-voltage detonator 22.

[0048] In a preferred embodiment, the plexiglass cylinder 21 has a first light-transmitting surface 211 and a second light-transmitting surface 212 on its left and right sides, respectively. The first and second light-transmitting surfaces 211 and 212 are polished to make them transparent. The heights of both the first and second light-transmitting surfaces 211 and 212 are the same as the plexiglass cylinder. The arrangement of the light-transmitting surfaces 211 and 212 effectively avoids light reflection from the curved surfaces of the plexiglass cylinder, thereby reducing interference sources for image acquisition by the rotating mirror scanning camera.

[0049] As a preferred embodiment, the first light-transmitting surface 211 and the second light-transmitting surface 212 have the same structure and are arranged in a mirror-symmetrical manner. The width of the first light-transmitting surface 211 is 16mm, and the ratio of the width to the diameter of the plexiglass column 1 is 0.4:1.

[0050] As a preferred embodiment, it also includes a pulsed light source 3 for experimental illumination, the pulsed light source 3 facing the second light-transmitting surface 212, and the image acquisition end of the rotating mirror scanning camera 1 facing the first light-transmitting surface 211.

[0051] As a preferred embodiment, the distance between the axis of the first detonation hole 25 and the bottom surface of the charging hole 24 is 4mm, and the diameter of the first detonation hole 25 is 1mm, ensuring that the heating wire 27 can pass through the powdered explosive 5 through the detonation hole 24.

[0052] As a preferred embodiment, the diameter of the charging hole 24 is 8mm and the depth of the charging hole 24 is 19mm, and the ratio of the depth of the charging hole 24 to the height of the plexiglass column 21 is 0.38:1.

[0053] In a preferred embodiment, the plexiglass column 21 is further provided with a first vibration isolation hole 28 and a second vibration isolation hole 29, each with a length of 16 mm and a diameter of 3 mm, coaxially along the radial direction. The first vibration isolation hole 28 is located directly below the first detonation hole 25, and the second vibration isolation hole 29 is located directly below the second detonation hole 26. That is, the first vibration isolation hole 28 is parallel to the first detonation hole 25, and the axis of the first vibration isolation hole 28 and the axis of the first detonation hole 25 are in the same vertical plane. The first vibration isolation hole 28 and the first detonation hole 25 have the same length, 16 mm, and the diameter is 3 mm. The second vibration isolation hole 29 is parallel to the second detonation hole 26, and the axis of the second vibration isolation hole 29 and the axis of the second detonation hole 26 are in the same vertical plane. The first vibration isolation hole 28 and the second vibration isolation hole 29 have the same structure and are mirror-symmetrically arranged. The distance between the axis of the first vibration isolation hole 28 and the axis of the first detonation hole 25 is 5 mm.

[0054] The first isolation hole 28 and the second isolation hole 29 are used to isolate the stress wave generated by the explosion of the heating wire from the interference caused by the stress wave generated by the explosion of the powdered explosive.

[0055] As a preferred embodiment, the heating wire 27 includes an aluminum heating wire and a nickel-chromium alloy heating wire. Other materials can also be selected as heating wires, as long as the selected heating wire can undergo an electric explosion under pulsed high voltage or high current excitation, thereby triggering the explosive. The diameter of the heating wire is 0.2 to 0.5 mm, and the length is greater than the diameter of the plexiglass cylinder 21.

[0056] In this embodiment, the heating wire 3 is made of Ni80Cr20 nickel-chromium alloy, with a diameter of 0.25 mm and a length of 60 mm.

[0057] As a preferred embodiment, the stress wave adjusting rod 23 is made of aluminum alloy, and the diameter of the stress wave adjusting rod 23 is 0.1 mm smaller than the diameter of the charging hole, the length of the stress wave adjusting rod 23 is 20 mm, and the ratio of the length of the stress wave adjusting rod 23 to the depth of the charging hole 24 is 1:1.

[0058] The acoustic impedance of the material used for the stress wave adjustment rod 23 should be greater than that of the detonation products of the explosive sample.

[0059] When using the device of the present invention: the heating wire 27 is passed through the first detonation hole 25, the charging hole 24, and the second detonation hole 26 inside the plexiglass cylinder 21, ensuring that both ends of the heating wire 27 protrude from the plexiglass cylinder 21 and can be connected to the positive and negative terminals of the high-voltage detonator 22; the weighed powdered explosive is poured into the bottom of the charging hole 24 and then gently compacted to ensure that the heating wire 3 inside the charging hole 24 is encased in the powdered explosive; the height of the powdered explosive inside the charging hole 24 is measured, and the height of the powdered explosive is calculated. Density; Place the stress wave adjusting rod 6 into the charging hole; Set the rotation speed of the built-in reflector in the rotating mirror scanning camera 1, and after the rotating mirror scanning camera 1 reaches the predetermined scanning and shooting speed, trigger the high-voltage detonator 22 to discharge, causing the resistance wire 27 to undergo an electrical explosion. The instantaneous high temperature and high pressure generated will detonate the powdered explosive and form a shock wave inside the plexiglass cylinder 21; The pulsed light source 3 is triggered to emit a strong light instantly; The rotating mirror scanning camera 1 records the trajectory of the shock wave head inside the plexiglass cylinder 21.

[0060] The testing principle of the device of this invention is as follows: After the powdered explosive is detonated, a shock wave is formed inside the plexiglass cylinder 21. The high pressure at the head of the shock wave causes the plexiglass cylinder 21 to suddenly undergo strong compression, resulting in a decrease in the light transmittance of the compressed area. Under the illumination of the pulsed light source 3, this area will block part of the light, and the blocked area moves with the propagation of the shock wave, thus leaving a trajectory on the film of the rotating mirror scanning camera 1 corresponding to the movement of the shock wave head. Based on this trajectory, the change in the propagation speed of the shock wave can be calculated based on existing theoretical formulas, and then the initial pressure of the shock wave and the detonation pressure of the powdered explosive can be calculated.

[0061] Example 2

[0062] This embodiment discloses an optical testing method for detonation pressure of small-quantity powdered explosives. This method is implemented using the optical testing device for detonation pressure of small-quantity powdered explosives provided in Embodiment 1, and specifically includes the following steps:

[0063] Step 1: Set up an optical testing device for detonation pressure of small-quantity powdered explosives in an explosion-proof laboratory or explosion-proof container, so that the plexiglass cylinder and the pulsed light source are on the optical axis of the rotating mirror scanning camera, and the center line of the first light-transmitting surface is within the field of view of the rotating mirror scanning camera, and the upper edge of the field of view of the rotating mirror scanning camera is in the same plane as the bottom surface of the charging hole; that is, the plexiglass cylinder is positioned between the rotating mirror scanning camera and the pulsed light source.

[0064] Step 2: Connect the two ends of the heating wire to the positive and negative terminals of the high-voltage detonator, respectively;

[0065] Step 3: After the rotating mirror scanning camera starts up and gradually reaches the set rotation speed, it triggers the high-voltage detonator and the pulse light source. After the high-voltage detonator is triggered, the heating wire explodes electrically, detonating the explosive sample and forming a shock wave in the plexiglass cylinder. The rotating mirror scanning camera obtains the trajectory image of the shock wave head in the plexiglass cylinder.

[0066] Step 4: Determine the displacement change curve of the shock wave based on the data points on the motion trajectory image;

[0067] like Figure 4 As shown, the powdered explosive was successfully detonated, and its detonation pressure generated a shock wave inside the plexiglass cylinder. The high pressure at the head of the shock wave caused the plexiglass to be suddenly compressed, resulting in a decrease in the light transmittance of that area. Under the illumination of a strong light source, this area would block some of the light, and the blocked area would move as the shock wave propagated, thus leaving a trajectory on the film of the scanning camera corresponding to the movement of the shock wave head. Figure 4 The image of the shock wave head's trajectory is very clear, indicating that the device can reliably detonate small amounts of powdered explosives. Based on the obtained trajectory image, combined with the image magnification ratio and camera scan rate, existing techniques can be used to obtain... Figure 5 The displacement change curve of the shock wave shown is the yt curve.

[0068] Step 5: Use the least squares method to fit the numerical values ​​of the shock wave displacement change curve to obtain the fitting parameters of the shock wave displacement change curve.

[0069] Specifically, the fitting formula is as follows:

[0070]

[0071] In the formula, b1, b2, and b3 are all fitting parameters;

[0072] Specifically, based on the shock wave displacement change curve (yt) obtained from the experiment, the coordinates of the points on the curve are substituted into the formula to obtain the values ​​of the three fitting parameters mentioned above.

[0073] In this embodiment, the obtained fitting parameters are b1 = 19.12364, b2 = 2.26, and b3 = 0.012405.

[0074] Step 6: Determine the initial velocity of the shock wave and the initial particle velocity based on the obtained fitting parameters;

[0075] Specifically, the initial velocity U of the shock wave m0 and initial particle velocity u m0 They are determined using the following formulas respectively:

[0076]

[0077]

[0078] The U ultimately determined in this embodiment m0 = 4.872 km / s, u m0 =1.504km / s.

[0079] Step 7: Determine the detonation pressure of the powdered explosive based on the initial velocity of the shock wave and the initial particle velocity;

[0080] Specifically, the detonation pressure is calculated using the following formula:

[0081]

[0082] In the formula,

[0083] p is the detonation pressure of the powdered explosive, in GPa.

[0084] ρ0 is the density of the powdered explosive, in g / cm³. 3 ;

[0085] D represents the detonation velocity of the powdered explosive, measured in km / s.

[0086] ρ g This refers to the density of acrylic glass, expressed in g / cm³. 3 .

[0087] In this embodiment, the parameters of the octogen (HMX) powdered explosive are ρ0 = 1.05 g / cm³. 3 D = 6.15 km / s, ρ g =1.18g / cm 3 Then, its detonation pressure can be calculated to be 9.18 GPa.

[0088] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0089] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0090] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An optical testing device for detonation pressure of micro-quantity powdered explosives, characterized in that, It includes a rotating mirror scanning camera (1) and an explosive detonation unit (2), wherein the rotating mirror scanning camera (1) is used to acquire images of the shock wave trajectory during the detonation of powdered explosive; The explosive detonation unit (2) includes an organic glass cylinder (21) and a high-pressure detonator (22). The organic glass cylinder (21) has an open top charging hole (24) arranged axially inside. A stress wave adjusting rod (23) is inserted into the charging hole (24). The bottom surface of the stress wave adjusting rod (23) can contact the powdered explosive loaded into the charging hole (24). The organic glass cylinder (21) is also provided with a first detonation hole (25) and a second detonation hole (26) coaxially along the radial direction, and the first detonation hole (25) and the second detonation hole (26) are both connected to the charging hole (24); the heating wire (27) passing through the first detonation hole (25), the charging hole (24) and the second detonation hole (26) can contact the powdered explosive in the charging hole (24), and the two ends of the heating wire (27) are respectively connected to the positive and negative poles of the high-pressure detonator (22).

2. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The organic glass column (21) has a first light-transmitting surface (211) and a second light-transmitting surface (212) on its left and right sides, respectively.

3. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 2, characterized in that, The first light-transmitting surface (211) and the second light-transmitting surface (212) have the same structure and are arranged in a mirror-symmetrical manner. The ratio of the width of the first light-transmitting surface (211) to the diameter of the plexiglass column (21) is (0.2~0.5):

1.

4. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, It also includes a pulsed light source (3), which faces the second light-transmitting surface (212), and the image acquisition end of the rotating mirror scanning camera (1) faces the first light-transmitting surface (211).

5. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The distance between the axis of the first detonation hole (25) and the bottom surface of the charging hole (24) is 3-10 mm, and the diameter of the first detonation hole (25) is 0.5-1.5 mm.

6. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The diameter of the loading hole (24) is 3 to 10 mm, and the ratio of the depth of the loading hole (24) to the height of the plexiglass column (21) is (0.2 to 0.5):

1.

7. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The plexiglass column (21) is also provided with a first vibration isolation hole (28) and a second vibration isolation hole (29) coaxially along the radial direction. The first vibration isolation hole (28) is located directly below the first detonation hole (25), and the second vibration isolation hole (29) is located directly below the second detonation hole (26). The first vibration isolation hole (28) and the second vibration isolation hole (29) have the same structure and are arranged in a mirror symmetrical manner. The diameter ratio of the first vibration isolation hole (28) to the first detonation hole (25) is (2~4):1, and the distance between the axis of the first vibration isolation hole (28) and the axis of the first detonation hole (25) is 2~6mm.

8. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The heating wire (27) includes aluminum heating wire and nickel-chromium alloy heating wire.

9. The optical testing device for detonation pressure of micro-quantity powdered explosives as described in claim 1, characterized in that, The stress wave adjusting rod (23) is made of aluminum alloy, and the diameter of the stress wave adjusting rod (23) is 0.02 to 0.2 mm smaller than the diameter of the charging hole. The ratio of the length of the stress wave adjusting rod (23) to the depth of the charging hole (24) is (1.0 to 1.3):

1.

10. An optical method for testing detonation pressure of a small amount of powdered explosive, characterized in that, This method is implemented using the optical testing device for detonation pressure of micro-powdered explosives as described in any one of claims 1 to 9, and specifically includes the following steps: Step 1: Set up an optical testing device for detonation pressure of small-quantity powdered explosives in an explosion-proof laboratory or explosion-proof container, so that the plexiglass cylinder and the pulsed light source are on the optical axis of the rotating mirror scanning camera, and the center line of the first light-transmitting surface is within the field of view of the rotating mirror scanning camera, and the upper edge of the field of view of the rotating mirror scanning camera and the bottom surface of the charging hole are in the same plane. Step 2: Connect the two ends of the heating wire to the positive and negative terminals of the high-voltage detonator, respectively; Step 3: The rotating mirror scanning camera starts up and gradually reaches the set rotation speed, triggering the high-voltage detonator and pulsed light source; after the high-voltage detonator is triggered, the heating wire explodes electrically, detonating the explosive sample and forming a shock wave inside the plexiglass cylinder; the rotating mirror scanning camera obtains the trajectory image of the shock wave head within the plexiglass cylinder. Step 4: Determine the displacement change curve of the shock wave based on the obtained motion trajectory image; Step 5: Use the least squares method to fit the numerical values ​​of the shock wave displacement change curve to obtain the fitting parameters of the shock wave displacement change curve. Step 6: Determine the initial velocity of the shock wave and the initial particle velocity based on the obtained fitting parameters; Step 7: Determine the detonation pressure of the powdered explosive based on the initial velocity of the shock wave and the initial particle velocity.

Images