Detonation pressure optical testing device and method for micro-dose powdery explosive

Abstract

The invention provides a detonation pressure optical testing device for a micro-dose powdery explosive, which comprises a rotating mirror type scanning camera and an explosive detonation unit, and is characterized in that the rotating mirror type scanning camera is used for collecting a shock wave motion trail image when the powdery explosive is detonated; the explosive detonating unit comprises an organic glass column body and a high-pressure exploder, an explosive charging hole with an open top is formed in the organic glass column body in the axial direction, a stress wave adjusting rod is arranged in the explosive charging hole in a penetrating mode, and the bottom face of the stress wave adjusting rod can make contact with powdery explosives charged into the explosive charging hole; a first detonating hole and a second detonating hole are coaxially formed in the organic glass column body in the radial direction, and both the first detonating hole and the second detonating hole communicate with the charging hole; the heating wire penetrating through the first detonating hole, the charging hole and the second detonating hole can make contact with the powdery explosive in the charging hole, and the two ends of the heating wire are connected with the positive electrode and the negative electrode of the high-pressure exploder correspondingly. According to the invention, a traditional detonation mode is not needed, the interference of the detonator and the explosion expanding explosive on the measurement process of the sample with the small explosive quantity is solved, and the test convenience and the test precision are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive laboratory measurement, and relates to a detonation pressure optical testing device and method for tiny-amount powdered explosives. Background Art

[0002] The detonation pressure of explosives (abbreviated as "detonation pressure" or "CJ detonation pressure") is the pressure at the head of the detonation wave after the explosive detonates. Its value represents both the initial and peak pressure of the detonation products, reflecting the intensity of the detonation and serving as a core parameter for characterizing explosive detonation performance. Therefore, in the development of new explosives, obtaining accurate detonation pressure is crucial for optimizing the design of explosive materials.

[0003] Currently, methods for measuring explosive detonation pressure primarily include optical scanning measurement using a superrotating mirror scanning camera, manganese-copper measurement using a manganese-copper pressure sensor, and laser interferometry using a laser interferometer particle velocity meter. These methods all have corresponding national military standards, but all require the explosive sample to weigh hundreds of grams. For example, the manganese-copper measurement method requires a sample size of 50 × 100 mm and a weight exceeding 300 g; the optical scanning measurement method (water tank method) requires a sample size of 60 × 65 mm and a weight exceeding 300 g. However, in the synthesis and development of new high-energy explosives, due to immature synthesis processes and the inability to achieve mass production, the available explosive sample sizes are generally in the gram range or even lower, which cannot meet the requirements of existing detonation pressure measurement methods. Furthermore, new explosives are relatively sensitive and cannot be formed into specific shapes such as cylinders through pressing or casting, and typically begin as powders.

[0004] When the amount of new explosives in the sample being tested drops below 1g, the measurement of their detonation pressure will face the following difficulties: in the traditional detonation method, the sum of the amounts of the detonator and the expansion charge will significantly exceed that of the sample being tested, and the measurement result will be caused by the coupling of the three, which will lead to a significant increase in the measurement result deviation, making it difficult to accurately characterize the true detonation pressure value of the sample being tested; the volume of the sample being tested is too small, and the existing measurement method will lead to large deviations in the measurement data and is no longer applicable; powdered explosives are difficult to precisely shape and cannot meet the high-precision layout requirements of existing measurement standards.

[0005] In summary, there is an urgent need to design a detonation pressure measurement method suitable for small-amount, powdered explosives to meet the measurement needs during the synthesis and development of new explosives. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an optical testing device and method for detonation pressure of small-amount powdered explosives, so as to solve the technical problem in the prior art of lacking a measuring device that can achieve the requirements of reliable detonation and high-precision layout of small-amount explosives.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] An optical detonation pressure testing device for 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 capture an image of the shock wave motion trajectory during the detonation of the powdered explosive.

[0009] The explosive detonation unit includes an organic glass column and a high-voltage initiator. A charging hole with an open top is axially arranged in the organic glass column. A stress wave adjustment rod is inserted into the charging hole. The bottom surface of the stress wave adjustment rod can contact the powdered explosive loaded into the charging hole.

[0010] A first blasting hole and a second blasting hole are also coaxially arranged radially within the organic glass column, and both the first blasting hole and the second blasting hole are connected to the charging hole; the heating wire passing through the first blasting hole, the charging hole and the second blasting 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-voltage detonator.

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

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

[0013] Furthermore, the first light-transmitting surface and the second light-transmitting surface have the same structure and are arranged in mirror symmetry, and the ratio of the width of the first light-transmitting surface to the diameter of the organic glass column is (0.2-0.5):1.

[0014] Furthermore, it further comprises a pulsed light source, wherein the pulsed light source faces the second light-transmitting surface, and 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 blasting hole and the bottom surface of the charging hole is 3 to 10 mm, and the diameter of the first blasting hole is 0.5 to 1.5 mm.

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

[0017] Furthermore, the organic glass column is also provided with a first shock-isolating hole and a second shock-isolating hole coaxially along the radial direction. The first shock-isolating hole is located directly below the first detonating hole, and the second shock-isolating hole is located directly below the second detonating hole. The first shock-isolating hole and the second shock-isolating hole have the same structure and are arranged in a mirror-symmetrical manner. The diameter ratio of the first shock-isolating hole to the first detonating hole is (2 to 4):1, and the distance between the axis of the first shock-isolating hole and the axis of the first detonating hole is 2 to 6 mm.

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

[0019] Furthermore, the stress wave adjustment rod is made of aluminum alloy, and the diameter of the stress wave adjustment 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 adjustment rod to the depth of the charging hole is (1.0 to 1.3):1.

[0020] The present invention also protects a method for optically testing the detonation pressure of a small amount of powdered explosive. The method is implemented by the above-mentioned optical testing device for detonation pressure of a small amount of powdered explosive, and specifically comprises the following steps:

[0021] Step 1: Arrange an optical detonation pressure test device for a small amount of powdered explosive in an explosion-proof laboratory or explosion-proof container, so that the organic glass cylinder and the pulsed light source are on the optical axis of a rotating mirror scanning camera, 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 charge hole are in the same plane;

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

[0023] Step 3: The rotating mirror scanning camera is started and gradually reaches a set rotation speed, triggering the high-voltage detonator and the pulsed light source; after the high-voltage detonator is triggered, the heating wire explodes electrically to detonate the explosive sample, forming a shock wave in the organic glass cylinder; the rotating mirror scanning camera obtains an image of the movement trajectory of the shock wave head in the organic glass cylinder;

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

[0025] Step 5: fitting the values ​​of the shock wave motion displacement change curve using the least square method to obtain fitting parameters of the shock wave motion displacement change curve;

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

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

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention eliminates the need for traditional detonation methods using detonators and explosives, thereby resolving the issue of interference with the measurement process of small-volume samples caused by detonators and explosives, significantly improving the convenience and accuracy of the test. In particular, the design of the charge hole resolves the issue of the inability of powdered explosives to precisely shape, which affects the layout of the optical test space. The provision of a light-transmitting plane prevents reflection of light by the curved surface of the organic glass cylinder, thereby reducing interference sources in the image. The design of the isolation hole isolates the interference caused by stress waves generated by the explosion of the heating wire on stress waves generated by the explosion of the explosive sample. The design of the stress wave adjustment rod reduces the rate of energy transfer from the explosive sample to other media in the initial stage of detonation, thereby improving the accuracy of the test measurement. The device of the present invention has a simple structure, is easy to use, and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0035] The meanings of the numbers in the figure are: 1-rotating mirror scanning camera, 2-explosive detonation unit, 3-pulse light source; 21-plexiglass cylinder, 22-high-voltage initiator, 23-stress wave adjustment rod, 24-charging hole, 25-first detonation hole, 26-second detonation hole, 27-heating wire, 28-first seismic isolation hole, 29-second seismic isolation hole; 211-first light-transmitting surface, 212-second light-transmitting surface.

[0036] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0037] The purpose of the present invention is to provide an optical testing device and method for the detonation pressure of a small-charge powdered explosive. This method, based on the optical scanning measurement method - the organic glass method, can effectively solve the problem of reliable initiation and high-precision layout of small-charge powdered explosive samples, and can accurately obtain the detonation pressure of small-charge 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 the present invention are components known in the prior art. A small amount of medicine refers to a medicine amount of 50mg to 1g.

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

[0040] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0041] Example 1:

[0042] Following the above technical solution, Figures 1 to 3 As shown in FIG. 1 , this embodiment provides an optical detonation pressure test device for a small amount of powdered explosive. The powdered explosive to be tested is HMX. After calculation, the density of the powdered explosive after compaction in the charging hole 24 is 1.05 g / cm 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 collect images of shock wave motion trajectories when powdered explosives detonate.

[0044] The explosive detonation unit 2 comprises an organic glass cylinder 21 and a high-voltage initiator 22. The organic glass cylinder 21 is preferably a cylinder with a diameter of 30-50 mm and a height of 50-70 mm. In this embodiment, the organic glass cylinder 21 has a diameter of 40 mm and a height of 50 mm. An open-top charging hole 24 is axially disposed within the organic glass cylinder 21. A stress wave adjustment rod 23 is inserted through the charging hole 24, the bottom surface of which is capable of contacting the powdered explosive loaded into the charging hole 24. The charging hole 24 allows the powdered explosive to be compacted, effectively resolving the problem of the optical test space layout being affected by the inability to precisely shape the powdered explosive. The high-voltage initiator 22 is used to excite the powdered explosive, causing it to undergo a detonation reaction.

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

[0046] In this embodiment, stress wave adjustment rod 23 is preferably an aluminum rod. This is because the impedance of aluminum is similar to the impedance of the powdered explosive sample during detonation, which prevents pressure increases within charging hole 24, ensuring that only the pressure generated by the detonation of the powdered explosive sample is transmitted. Therefore, stress wave adjustment rod 23 not only reduces the rate of transfer of energy generated by the powdered explosive sample during the initial detonation to other media, but also prevents pressure interference, thereby improving the accuracy of test measurements.

[0047] A first blasting hole 25 and a second blasting hole 26 are also coaxially arranged radially in the organic glass cylinder 21, and the first blasting hole 25 and the second blasting hole 26 are both connected to the charging hole 24; the heating wire 27 passing through the first blasting hole 25, the charging hole 24 and the second blasting 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] As a preferred embodiment of this embodiment, a first light-transmitting surface 211 and a second light-transmitting surface 212 are provided on the left and right sides of the organic glass cylinder 21, respectively. These first and second light-transmitting surfaces 211, 212 are polished to be transparent, and the heights of the first and second light-transmitting surfaces 211, 212 are the same as those of the organic glass cylinder. The provision of the first and second light-transmitting surfaces 211, 212 effectively prevents light from being reflected by the curved surface of the organic glass cylinder, thereby reducing interference with the image captured by the rotating mirror scanning camera.

[0049] As a preferred solution of this embodiment, the first light-transmitting surface 211 and the second light-transmitting surface 212 have the same structure and are arranged in mirror symmetry. The width of the first light-transmitting surface 211 is 16 mm, and the ratio of the width to the diameter of the organic glass cylinder 1 is 0.4:1.

[0050] As a preferred solution of this embodiment, a pulsed light source 3 for test illumination is further included. The pulsed light source 3 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 .

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

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

[0053] As a preferred solution of this embodiment, a first shock-isolating hole 28 and a second shock-isolating hole 29 with a length of 16 mm and a diameter of 3 mm are also coaxially provided in the radial direction on the organic glass cylinder 21. The first shock-isolating hole 28 is located directly below the first detonating hole 25, and the second shock-isolating hole 29 is located directly below the second detonating hole 26, that is, the first shock-isolating hole 28 is arranged in parallel with the first detonating hole 25, and the axis of the first shock-isolating hole 28 and the axis of the first detonating hole 25 are located in the same vertical plane. The first shock-isolating hole 28 and the first detonating hole 25 have the same length, both of which are 16 mm, and the diameter of both are 3 mm; the second shock-isolating hole 29 is arranged in parallel with the second detonating hole 26, and the axis of the second shock-isolating hole 29 and the axis of the second detonating hole 26 are located in the same vertical plane; the first shock-isolating hole 28 and the second shock-isolating hole 29 have the same structure and are arranged in mirror symmetry; the distance between the axis of the first shock-isolating hole 28 and the axis of the first detonating 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 interfering with the stress wave generated by the explosion of the powdered explosive.

[0055] As a preferred solution of this embodiment, the heating wire 27 includes an aluminum heating wire and a nickel-chromium alloy heating wire. Heating wires of other materials can also be selected, as long as the selected heating wire can undergo electrical explosion under pulsed high voltage or high current excitation, thereby detonating 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 organic glass cylinder 21.

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

[0057] As a preferred solution of this embodiment, the stress wave adjustment rod 23 is made of aluminum alloy, and the diameter of the stress wave adjustment rod 23 is 0.1 mm smaller than the diameter of the charging hole, the length of the stress wave adjustment rod 23 is 20 mm, and the ratio of the length of the stress wave adjustment 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 the acoustic impedance of the detonation product of the explosive sample.

[0059] When the device of the present invention is used: the heating wire 27 is passed through the first detonation hole 25, the charging hole 24 and the second detonation hole 26 in the organic glass cylinder 21, and both ends of the heating wire 27 are ensured to pass through the organic glass cylinder 21 and be connected to the positive and negative electrodes 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 in the charging hole 24 is wrapped in the powdered explosive; the height of the powdered explosive in the charging hole 24 is measured and the powdered explosive is calculated. density; placing the stress wave adjustment rod 6 into the charging hole; setting the rotation rate of the built-in reflector in the rotating mirror scanning camera 1, starting the rotating mirror scanning camera 1 to reach a predetermined scanning shooting rate, triggering the high-voltage detonator 22 to discharge, and the resistance wire 27 to explode electrically. The instantaneous high temperature and high pressure generated will detonate the powdered explosive and form a shock wave in the organic glass cylinder 21; the pulsed light source 3 emits strong light at the moment it is triggered; the rotating mirror scanning camera 1 records the movement trajectory of the shock wave head in the organic glass cylinder 21.

[0060] The testing principle of the device of the present invention is as follows: after the powdered explosive detonates, a shock wave is formed in the organic glass cylinder 21. The high pressure at the head of the shock wave causes the organic glass cylinder 21 to suddenly produce 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 this blocked area moves as the shock wave propagates, leaving a trajectory corresponding to the movement of the shock wave head on the film of the rotating mirror scanning camera 1; based on this motion trajectory, the change in the shock wave propagation speed 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 a method for optically testing detonation pressure for a small amount of powdered explosive. The method is implemented using the optical testing device for detonation pressure for a small amount of powdered explosive provided in Example 1, and specifically includes the following steps:

[0063] Step 1. Arrange a detonation pressure optical test device for small amounts of powdered explosives in an explosion-proof laboratory or explosion-proof container, so that the organic glass cylinder and the pulsed light source are on the optical axis of a rotating mirror scanning camera, 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 located in the same plane; that is, the organic glass cylinder is located 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 electrodes of the high-voltage detonator respectively;

[0065] Step 3: After the rotating mirror scanning camera is started and gradually reaches a set rotation speed, the high-voltage initiator and the pulse light source are triggered. After the high-voltage initiator is triggered, the heating wire is electrically exploded to detonate the explosive sample and form a shock wave in the organic glass cylinder; the rotating mirror scanning camera obtains an image of the movement trajectory of the shock wave head in the organic glass cylinder;

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

[0067] like Figure 4 As shown in the figure, the powdered explosive was successfully detonated, and its detonation pressure caused a shock wave to be generated in the organic glass column. The high pressure at the head of the shock wave caused the organic glass to be suddenly compressed strongly, resulting in a decrease in the light transmittance of this area. Under the illumination of a strong light source, this area would block part of the light, and this blocked area would move with the propagation of the shock wave, leaving a track corresponding to the movement of the shock wave head on the film of the scanning camera. Figure 4 The image of the shock wave head motion trajectory in the image is very clear, indicating that the device can reliably detonate a small amount of powdered explosives. Based on the obtained motion trajectory image, combined with the image magnification ratio and camera scanning rate, the following can be obtained using existing technology: Figure 5 The shock wave motion displacement change curve shown is the yt curve.

[0068] Step 5: fitting the values ​​of the shock wave motion displacement change curve using the least square method to obtain fitting parameters of the shock wave motion displacement change curve;

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

[0070]

[0071] Where b1, b2, and b3 are fitting parameters;

[0072] Specifically, according to the shock wave motion 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 above three fitting parameters.

[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 shock wave velocity and initial particle velocity based on the obtained fitting parameters;

[0075] Specifically, the initial velocity of the shock wave U m0 and the initial particle velocity u m0 Determined by the following formulas:

[0076]

[0077]

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

[0079] Step 7: determining the detonation pressure of the powdered explosive according to the initial shock wave velocity and the initial particle velocity;

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

[0081]

[0082] Where,

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

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

[0085] D is the detonation velocity of powdered explosive, in km / s;

[0086] ρ g is the density of organic glass, in g / cm 3 .

[0087] In this embodiment, the parameter of HMX powdered explosive is ρ0=1.05g / cm 3 ,D=6.15km / s,ρ g =1.18g / cm 3 , we can calculate that its detonation pressure is 9.18GPa.

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

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

[0090] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An optical detonation pressure test device for small-amount powdered explosives, characterized in that: It comprises a rotating mirror scanning camera (1) and an explosive detonation unit (2), wherein the rotating mirror scanning camera (1) is used to collect images of shock wave motion trajectories during detonation of powdered explosives; The explosive detonation unit (2) comprises an organic glass column (21) and a high-pressure detonator (22); a charging hole (24) with an open top is axially arranged in the organic glass column (21); a stress wave regulating rod (23) is passed through the charging hole (24); and the bottom surface of the stress wave regulating rod (23) can contact the powdered explosive loaded in the charging hole (24); A first blasting hole (25) and a second blasting hole (26) are coaxially arranged in the radial direction in the organic glass column (21), and the first blasting hole (25) and the second blasting hole (26) are both connected to the charging hole (24); an electric heating wire (27) passing through the first blasting hole (25), the charging hole (24) and the second blasting hole (26) can contact the powdered explosive in the charging hole (24), and the two ends of the electric heating wire (27) are respectively connected to the positive and negative electrodes of the high-voltage detonator (22).

2. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: A first light-transmitting surface (211) and a second light-transmitting surface (212) are respectively provided on the left and right sides of the organic glass column (21).

3. The optical detonation pressure measuring device for a small amount of powdered explosive according to 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 mirror symmetry. The ratio of the width of the first light-transmitting surface (211) to the diameter of the organic glass column (21) is (0.2-0.5):

1.

4. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, wherein: It also includes a pulsed light source (3), the pulsed light source (3) 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 detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: The distance between the axis of the first blasting hole (25) and the bottom surface of the charge hole (24) is 3 to 10 mm, and the diameter of the first blasting hole (25) is 0.5 to 1.5 mm.

6. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: The diameter of the charge hole (24) is 3 to 10 mm, and the ratio of the depth of the charge hole (24) to the height of the organic glass column (21) is (0.2 to 0.5):

1.

7. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: The organic glass column (21) is also provided with a first shock-isolating hole (28) and a second shock-isolating hole (29) coaxially along the radial direction. The first shock-isolating hole (28) is located directly below the first detonating hole (25), and the second shock-isolating hole (29) is located directly below the second detonating hole (26). The first shock-isolating hole (28) and the second shock-isolating hole (29) have the same structure and are arranged in a mirror-symmetrical manner. The diameter ratio of the first shock-isolating hole (28) to the first detonating hole (25) is (2 to 4):1, and the distance between the axis of the first shock-isolating hole (28) and the axis of the first detonating hole (25) is 2 to 6 mm.

8. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: The heating wire (27) includes an aluminum heating wire and a nickel-chromium alloy heating wire.

9. The optical detonation pressure measuring device for a small amount of powdered explosive according to claim 1, characterized in that: The stress wave adjustment rod (23) is made of aluminum alloy, and the diameter of the stress wave adjustment rod (23) is 0.02-0.2 mm smaller than the diameter of the charge hole. The ratio of the length of the stress wave adjustment rod (23) to the depth of the charge hole (24) is (1.0-1.3):

1.

10. An optical test method for detonation pressure of a small amount of powdered explosive, characterized in that: The method is implemented by means of an optical detonation pressure test device for a small amount of powdered explosive according to any one of claims 1 to 9, and specifically comprises the following steps: Step 1: Arrange an optical detonation pressure test device for a small amount of powdered explosive in an explosion-proof laboratory or explosion-proof container, so that the organic glass cylinder and the pulsed light source are on the optical axis of a rotating mirror scanning camera, 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 charge hole are in the same plane; Step 2: Connect the two ends of the heating wire to the positive and negative electrodes of the high-voltage detonator respectively; Step 3: The rotating mirror scanning camera is started and gradually reaches a set rotation speed, triggering the high-voltage detonator and the pulsed light source; after the high-voltage detonator is triggered, the heating wire explodes electrically to detonate the explosive sample, forming a shock wave in the organic glass cylinder; the rotating mirror scanning camera obtains an image of the movement trajectory of the shock wave head in the organic glass cylinder; Step 4: determining the shock wave motion displacement change curve based on the obtained motion trajectory image; Step 5: fitting the values ​​of the shock wave motion displacement change curve using the least square method to obtain fitting parameters of the shock wave motion displacement change curve; Step 6: Determine the initial shock wave velocity and initial particle velocity based on the obtained fitting parameters; Step 7: Determine the detonation pressure of the powdered explosive according to the initial shock wave velocity and the initial particle velocity.

Images