A device and method for synchronously testing the transient ignition temperature and reaction process of explosives.

Abstract

This invention discloses a device and method for synchronously testing the transient ignition temperature and reaction process of explosives, relating to the field of explosive testing technology. The key technical features include: a light gas gun; a magnetic velocity measurement system installed at the muzzle of the light gas gun; a protective target chamber with a fixed target plate inside, the sample to be tested being fixed at the center of the fixed target plate; a high-speed infrared radiation thermometer; a high-speed camera; an optical path integration system including a prism and / or a reflector; and a synchronous trigger connected to the magnetic velocity measurement system. This invention enables the synchronous, non-contact acquisition of the transient surface temperature history of explosives under high-speed impact loading and dynamic images of their ignition and combustion processes, thereby accurately determining the impact ignition temperature threshold of the explosive and revealing the correlation mechanism between the ignition process and temperature evolution.

Description

Technical Field

[0001] This invention relates to the field of explosive testing technology, and more specifically, to a device and method for synchronously testing the transient ignition temperature and reaction process of explosives. Background Technology

[0002] The safety and detonation reliability of explosives under impact conditions are central to weapon design and safety assessment. Among these parameters, the impact ignition temperature (commonly known as the "hot spot" temperature) of an explosive is a key parameter for determining its detonation threshold and assessing its safety.

[0003] Due to the extremely short duration (microseconds) of the impact process, the accompanying drastic physicochemical changes, and the presence of intense light and high heat flux, traditional contact temperature measurement methods (such as thermocouples) and ordinary optical temperature measurement methods have serious limitations: 1. Difficulty in non-contact measurement without interference: Under high-speed impact, contact sensors have slow response, are easily interfered with, and their intervention can damage the sample state; 2. Insufficient temporal and spatial resolution: The ignition process is accompanied by chemical reactions, and its temperature field changes rapidly, requiring a response time on the order of microseconds or even nanoseconds; 3. Limited process information: A single temperature measurement method cannot provide key image information such as the location of the ignition point, the flame propagation process, and the intensity of the reaction, making it difficult to accurately correlate temperature data with the reaction kinetics process.

[0004] Therefore, researching and designing a synchronous testing device and method for the transient ignition temperature and reaction process of explosives that can overcome the above-mentioned defects is an urgent problem that we need to solve. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for synchronously testing the transient ignition temperature and reaction process of explosives. This method can synchronously and non-contactly acquire the history of the transient surface temperature of explosives under high-speed impact loading and the dynamic images of their ignition and combustion processes, so as to accurately determine the impact ignition temperature threshold of explosives and reveal the correlation mechanism between the ignition process and temperature evolution.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] Firstly, a device for synchronously testing the transient ignition temperature and reaction process of explosives is provided, comprising:

[0008] A light gas cannon is used to drive a loaded bullet to impact the sample under test.

[0009] A magnetic velocity measurement system is installed at the muzzle of the light air gun to measure the flight speed of the loaded bullet in a non-contact manner and generate a trigger signal.

[0010] A protective target chamber is provided with a fixed target plate inside, and the sample to be tested is fixed at the center of the fixed target plate;

[0011] A high-speed infrared radiation thermometer is used to detect the infrared radiation on the surface of the sample to be tested and output the raw voltage signal.

[0012] A high-speed camera is used to simultaneously acquire visible light image sequences of the ignition and combustion process of the sample under test;

[0013] An optical path integration system, including a prism and / or a mirror, is used to fold and integrate the optical path so that the field of view of the high-speed infrared radiation thermometer and the high-speed camera are aligned with the same area of ​​the surface of the sample to be tested.

[0014] A synchronous trigger, connected to the magnetic velocity measurement system, is used to synchronously start the high-speed infrared radiation thermometer and the high-speed camera when the magnetic velocity measurement system is triggered.

[0015] Furthermore, the optical path integration system also includes a mirror assembly;

[0016] The direction of the light path is adjusted by the reflector group to reduce ambient light interference.

[0017] Furthermore, the high-speed infrared radiation thermometer operates in the 3-5μm band, and its output original voltage signal is calculated into a temperature value based on Planck's blackbody radiation law.

[0018] Furthermore, the side wall of the protective target chamber is provided with an observation window, through which the optical path integration system, the high-speed infrared radiation thermometer, and the high-speed camera are all aimed at the sample to be tested.

[0019] Secondly, a method for simultaneously testing the transient ignition temperature and reaction process of an explosive is provided. This method is used in a device for simultaneously testing the transient ignition temperature and reaction process of an explosive as described in any one of the first aspects, and includes the following steps:

[0020] Explosives of a predetermined size and density were prepared as test samples. The emissivity of the sample surface was calibrated using a blackbody furnace combined with an infrared thermometer, and emissivity-temperature relationship data were established.

[0021] The sample to be tested is fixed at the center of the fixed target plate of the protective target chamber. The loaded bullet is driven by the light air gun to impact the sample. The magnetic velocity measurement system triggers the synchronous trigger to start the high-speed infrared radiation thermometer and the high-speed camera.

[0022] The original voltage signal on the sample surface is detected by the high-speed infrared radiation thermometer, and the visible light image sequence of the ignition and combustion process is acquired by the high-speed camera.

[0023] Based on the emissivity-temperature relationship data and Planck's blackbody radiation law, the original voltage signal is converted into a temperature-time curve;

[0024] Ignition location, flame propagation speed, and reaction zone morphology evolution are extracted from the visible light image sequence, and the calibrated ignition time is determined.

[0025] Align the temperature-time curve with the visible light image sequence on the time axis, and determine the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature based on the calibrated ignition time.

[0026] Furthermore, the calibration of the sample emissivity of the sample surface using a blackbody furnace combined with an infrared thermometer includes:

[0027] The sample to be tested is placed in a blackbody furnace and stabilized at a known temperature. The first response voltage of the infrared thermometer to the blackbody furnace and the second response voltage of the sample to be tested are recorded.

[0028] The sample emissivity is determined by the ratio of the second response voltage to the first response voltage, and stored as emissivity-temperature relationship data.

[0029] Furthermore, the step of converting the original voltage signal into a temperature-time curve based on the emissivity-temperature relationship data and Planck's blackbody radiation law includes:

[0030] Based on Planck's blackbody radiation law, the original voltage signal is converted into a temperature value through inversion using the calibrated sample emissivity and temperature response function, thereby generating the temperature-time curve.

[0031] Furthermore, the temperature value inversion conversion is calculated using Wien's displacement law or band brightness thermometry.

[0032] Furthermore, the method also includes:

[0033] After fixing the sample to be tested onto the fixed target plate of the protective target chamber, the inside of the protective target chamber is evacuated.

[0034] Furthermore, determining the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature includes:

[0035] Determine the impact ignition temperature threshold corresponding to the instant of ignition;

[0036] Determine the temperature change characteristics at different stages of reaction development, including ignition, rapid combustion, and stable combustion;

[0037] And / or, determine a quantitative relationship between temperature changes and the severity of the reaction, the severity of which is determined by changes in image brightness and / or area.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. This invention achieves field-of-view alignment and nanosecond-level synchronous start-up of a high-speed infrared radiation thermometer and a high-speed camera by using a light gas cannon to drive a loaded bullet to impact a sample. Combined with a magnetic velocity measurement system, a synchronous trigger, and an optical path integration system, this solves the problems of slow response and easy interference with sample state during impact in traditional contact temperature measurement methods (such as thermocouples). For example, the magnetic velocity measurement system generates a trigger signal when the bullet passes the muzzle, and the synchronous trigger distributes the start command, ensuring strict alignment of temperature data and image sequences on the time axis. This supports non-contact measurement of microsecond-level transient processes. This design avoids sample damage caused by sensor intervention, improves data reliability, and is particularly suitable for high-precision research on explosive impact ignition.

[0040] 2. The optical path integration system in this invention includes a prism and a reflector group. By folding the optical path and adjusting its direction, the field of view of the infrared thermometer and the camera are precisely aligned with the same area of ​​the sample, while effectively reducing ambient light interference. In addition, the reflector group design reduces the influence of stray light, and combined with the observation window of the protective target chamber, it ensures the stability of the optical path. This integration not only solves the problem of field of view offset in complex experiments, but also improves the signal-to-noise ratio of infrared radiation thermometry, making the temperature calculation more accurate when based on Planck's blackbody radiation law, especially suitable for transient testing under strong light background.

[0041] 3. This invention integrates optical paths to make temperature measurement and imaging fields of view coincide. The device supports the synchronous acquisition and correlation analysis of temperature data and visible light image sequences. It extracts parameters such as ignition position and flame propagation speed from the images and aligns them with the temperature curve to determine the ignition temperature threshold and reaction stage characteristics. This multimodal integration solves the problem of single process information, realizes the quantitative correlation between temperature and reaction intensity, and deepens the understanding of the explosive initiation mechanism. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0043] Figure 1 This is a schematic diagram of the overall structure in Embodiment 1 of the present invention;

[0044] Figure 2 This is a flowchart from Embodiment 2 of the present invention.

[0045] The attached diagram shows the markings and corresponding component names:

[0046] 1. Light air cannon; 2. Magnetic velocity measurement system; 3. Loaded bullet; 4. Protective target chamber; 5. Prism; 6. Light source; 7. Synchronization trigger; 8. High-speed infrared radiation thermometer; 9. High-speed camera; 10. Sample to be tested; 11. Fixed target plate; 12. Observation window. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0048] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0049] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Example 1: A device for synchronously testing the transient ignition temperature and reaction process of explosives, such as... Figure 1 As shown, it includes a light air cannon 1, a magnetic velocity measurement system 2, a protective target chamber 4, a high-speed infrared radiation thermometer 8, a high-speed camera 9, an optical path integration system, and a synchronization trigger 7.

[0052] The system comprises: a light air cannon 1, used to drive a loaded bullet 3 to impact the sample 10 under test; a magnetic velocity measurement system 2, located at the muzzle of the light air cannon 1, used to non-contactly measure the flight speed of the loaded bullet 3 and generate a trigger signal; a protective target chamber 4, with a fixed target plate 11 inside, the sample 10 under test being fixed at the center of the fixed target plate 11; a high-speed infrared radiation thermometer 8, used to detect the infrared radiation on the surface of the sample 10 under test and output the original voltage signal; a high-speed camera 9, used to simultaneously acquire visible light image sequences of the ignition and combustion process of the sample 10 under test; an optical path integration system, including a prism 5 and / or a reflector, used to fold and integrate the optical path so that the field of view of the high-speed infrared radiation thermometer 8 and the high-speed camera 9 are aligned with the same area on the surface of the sample 10 under test; and a synchronous trigger 7, connected to the magnetic velocity measurement system 2, used to synchronously start the high-speed infrared radiation thermometer 8 and the high-speed camera 9 when the magnetic velocity measurement system 2 is triggered.

[0053] The optical path integration system also includes a mirror group; the direction of the optical path is adjusted by the mirror group to reduce ambient light interference.

[0054] The high-speed infrared radiation thermometer 8 operates in the 3-5μm band, and its output original voltage signal is calculated into a temperature value based on Planck's blackbody radiation law.

[0055] The side wall of the protective target chamber 4 is equipped with an observation window 12. The optical path integration system, the high-speed infrared radiation thermometer 8 and the high-speed camera 9 are all aligned with the sample 10 to be tested through the observation window 12.

[0056] During the sample preparation and emissivity calibration process, explosive samples of specific size and density need to be prepared according to requirements. The spectral emissivity or equivalent emissivity of the surface of the explosive sample or a specific band is accurately calibrated using a blackbody furnace combined with an infrared thermometer to obtain reliable emissivity-temperature relationship data. Then, the explosive sample is fixed in the center of the target plate (steel plate or inert constraint plate) of the special target chamber to ensure that its test surface is flat and clean.

[0057] In the construction of the impact loading and synchronous triggering system, a light gas gun 1 is used as the loading device to drive the bullet to impact the test sample to achieve impact loading. The end of the barrel of the light gas gun 1 is connected to the loaded bullet 3 by ejection release. After the high-pressure gas is filled in, it pushes the bullet to accelerate. The movement direction of the loaded bullet 3 is strictly pointed to the fixed target plate 11 in the protective target chamber 4. The test sample 10 is fixed to the center of the target plate 11 by a rigid clamp / adhesive layer to ensure that the sample is subjected to uniform force and the position can be repeated during impact.

[0058] A non-contact magnetic velocity measuring device is set up near the muzzle. The magnetic velocity measuring system 2 surrounds the muzzle of the light air gun 1 through an electromagnetic induction coil. When the loaded bullet 3 (containing magnetic material or embedded permanent magnet) passes through the muzzle, the coil cuts the magnetic field lines to generate an induced current. The current is amplified and shaped to generate a trigger signal. This signal is transmitted to the input port of the synchronous trigger 7 through a shielded cable. The synchronous trigger 7 then distributes the synchronous start signal to the control ports of the high-speed infrared radiation thermometer 8 and the high-speed camera 9, realizing the synchronous start of multiple devices triggered by a single signal.

[0059] The observation window 12 on the side wall of the protective target chamber is a double-sealed optical window (the inner layer is resistant to high pressure, and the outer layer transmits infrared / visible light). The optical path integration system (prism 5, reflector, and reflector group) is fixed to the outside of the observation window 12 by an optical adjustment bracket, forming a common optical path system for infrared and visible light.

[0060] The high-speed infrared radiation thermometer 8 receives the infrared radiation from the sample after it has been folded through the optical path. The radiation energy is converted into a raw voltage signal and then transmitted to an external data acquisition card through a coaxial cable.

[0061] The lens of the high-speed camera 9 receives the visible light from the sample after optical path modulation. The light signal is converted into a digital image and then transmitted to the image storage server through the optical fiber / high-speed interface.

[0062] The spatial relationship among the three must satisfy the following: the field of view of the thermometer, the field of view of the camera, and the area to be measured on the sample surface must completely overlap at the observation window 12, which is achieved by calibrating the optical path angle and focal length using a three-dimensional laser alignment instrument.

[0063] Outside the observation window on the side of the protective target chamber 4, the optical path is precisely adjusted so that the optical path of the high-speed infrared radiation thermometer 8 is aligned with the front end of the explosive to be tested (multiple channels can be arranged). Next, a high-speed camera 9 is installed to record the ignition and reaction process in the visible light band. To ensure that the optical field of view of the high-speed infrared radiation thermometer 8 and the field of view of the high-speed camera are precisely aligned with the same area on the surface of the explosive sample, a prism 5 or a mirror system is used to fold and integrate the optical path, ensuring that the infrared temperature measurement and visible light imaging originate from the same point. A synchronization trigger 7 is arranged to activate the high-speed infrared radiation thermometer 8 and the high-speed camera 9 at the instant the magnetic velocity measurement system 2 is triggered, ensuring that data at the moment of impact can be acquired.

[0064] The raw voltage signal recorded by the high-speed infrared radiation thermometer 8, combined with pre-calibrated sample emissivity data, is used to calculate the true temperature-time history (Tt) curve of the measuring points on the sample surface using Planck's blackbody radiation law or its simplified forms (such as Wien's displacement law or band brightness thermometry formula). Process image analysis: Analyzing the high-speed camera image sequence, key process information such as the ignition delay time, ignition location, flame propagation speed, and reaction zone morphological evolution of the explosive is identified, and the precise moment of ignition is determined. Data synchronization and correlation: The calculated temperature-time curve is precisely aligned with the reaction process image sequence recorded by the high-speed camera on the time axis. By comparison, the following can be determined: the precise temperature corresponding to the instant of ignition, i.e., the impact ignition temperature threshold; the temperature change characteristics of different stages of reaction development (ignition, rapid combustion, stable combustion, etc.); and the quantitative relationship between temperature change and reaction intensity (such as changes in image brightness or area).

[0065] Example 2: A method for synchronously testing the transient ignition temperature and reaction process of an explosive, wherein the method is used in a synchronous testing device for the transient ignition temperature and reaction process of an explosive as described in Example 1, such as... Figure 2 As shown, this is achieved through the following steps.

[0066] Step 1: Prepare explosives of a set size and density as test sample 10. Use a blackbody furnace combined with an infrared thermometer to calibrate the emissivity of the sample surface and establish emissivity-temperature relationship data.

[0067] Specifically, the sample 10 to be tested is placed in a blackbody furnace and stabilized at a known temperature. The first response voltage of the infrared thermometer to the blackbody furnace and the second response voltage of the sample 10 to be tested are recorded. The emissivity of the sample is determined by the ratio of the second response voltage to the first response voltage and stored as emissivity-temperature relationship data.

[0068] Step 2: Fix the sample 10 to be tested at the center of the fixed target plate 11 of the protective target chamber 4, and drive the loaded bullet 3 to impact the sample through the light air gun 1. The magnetic velocity measurement system 2 triggers the synchronous trigger 7 to start the high-speed infrared radiation thermometer 8 and the high-speed camera 9.

[0069] In addition, after fixing the sample 10 to be tested onto the fixed target plate 11 of the protective target chamber 4, the interior of the protective target chamber 4 is evacuated.

[0070] Step 3: Detect the original voltage signal on the sample surface using a high-speed infrared radiation thermometer 8, and acquire visible light image sequences of the ignition and combustion process using a high-speed camera 9;

[0071] Step 4: Based on the emissivity-temperature relationship data and Planck's blackbody radiation law, convert the original voltage signal into a temperature-time curve.

[0072] Specifically, based on Planck's blackbody radiation law, the original voltage signal is converted into temperature values ​​through inversion using the calibrated sample emissivity and temperature response function, generating a temperature-time curve. The temperature inversion conversion is calculated using Wien's displacement law or band brightness thermometry.

[0073] Step 5: Extract the ignition location, flame propagation speed, and reaction zone morphological evolution from the visible light image sequence, and calibrate the ignition time at which ignition occurs;

[0074] Step 6: Align the temperature-time curve with the visible light image sequence on the time axis, and determine the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature based on the calibrated ignition time.

[0075] Determining the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature specifically includes one or more of the following: determining the impact ignition temperature threshold corresponding to the instant of ignition; determining the temperature change characteristics of different stages of reaction development, including ignition, rapid combustion, and stable combustion; and determining the quantitative relationship between temperature change and reaction intensity, where reaction intensity is determined by changes in image brightness and / or area.

[0076] Infrared radiation thermometry is a technology that senses the distribution of thermal radiation from an object. It is a comprehensive technology based on quantum radiometry, infrared detection technology, and digital signal processing algorithms. Its core objective is to accurately retrieve the transient temperature information of a scene's surface from the non-contact electromagnetic waves emitted by the object. A highly sensitive infrared photosensitive unit captures the energy flow released by the target object within a specific wavelength bandwidth and converts it into an electrical signal. Its physical core is that any object above absolute zero emits infrared radiation. When this beam of photons passes through a precision optical lens assembly and is focused onto a photodetector, the light energy induces changes in the electrical properties of semiconductor materials. The system quantifies the level fluctuations generated by this photoelectric conversion and performs nonlinear fitting using Planck's radiation law, thereby achieving real-time temperature capture of the target object at the microsecond level.

[0077] The temperature measurement core of this invention is based on Planck's law of blackbody radiation. According to the definition in physics, the energy density spectrum of blackbody radiation is as follows:

[0078] ;

[0079] Where L is the energy density. Where λ is the wavelength and T is the thermodynamic temperature. and is the radiation constant.

[0080] In practical engineering applications, integrating this formula within the 3-5μm wavelength range yields the functional relationship between energy density and temperature in this frequency band. Since this relationship exhibits a strictly monotonically increasing characteristic within the 60-1200℃ range, temperature can be inferred by measuring the radiant energy.

[0081] The final electrical output follows the response function:

[0082] ;

[0083] Where U is the output voltage signal of the thermometer; ε is the known temperature response function obtained from theoretical calculations and experimental verification; ε is the integration coefficient, a key variable that includes various influencing factors such as the sample's emissivity, optical path attenuation coefficient, and system coupling factor.

[0084] Before the experiment begins, the specific integration coefficient ε for this experiment must be determined through a calibration process. During the calibration process, the blackbody furnace (if its emissivity is known to be 1) must be heated to a stable temperature. Record the voltage measured by the data acquisition card at this time. This voltage is then input into the control software as the "calibration voltage". If the sample emissivity is unknown, the sample needs to be placed in a blackbody furnace, and the voltage recorded at the same temperature. By comparing the voltage response amplitudes at the same temperature between "with sample" and "without sample" ( / The emissivity of the sample can be directly calculated using a known calibration temperature. Given the known emissivity of the calibrated source and the measured calibrated voltage, the integration coefficient ε can be calculated.

[0085] In subsequent actual temperature measurements, the original voltage signal was obtained. Then, using the ε determined by calibration and the known function The accurate temperature of the target can be calculated using the following formula:

[0086] .

[0087] Working Principle: This invention uses a light gas cannon to drive a loaded bullet to impact a sample. Combined with a magnetic velocity measurement system, a synchronous trigger, and an optical path integration system, it achieves field-of-view alignment and nanosecond-level synchronous startup between a high-speed infrared radiation thermometer and a high-speed camera. This solves the problems of slow response and easy interference with sample state during impact in traditional contact temperature measurement methods (such as thermocouples). Furthermore, this invention integrates the optical path to ensure that the temperature measurement and imaging fields of view coincide. The device supports the synchronous acquisition and correlation analysis of temperature data and visible light image sequences. Parameters such as ignition position and flame propagation speed are extracted from the images and aligned with the temperature curve to determine the ignition temperature threshold and reaction stage characteristics. This multimodal integration solves the problem of single process information, achieving a quantitative correlation between temperature and reaction intensity, and deepening the understanding of the explosive initiation mechanism.

[0088] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for synchronously testing the transient ignition temperature and reaction process of explosives, characterized in that, include: A light gas cannon (1) is used to drive a loaded bullet (3) to impact the sample (10) to be tested; A magnetic velocity measurement system (2) is installed at the muzzle of the light air gun (1) to measure the flight speed of the loaded bullet (3) in a non-contact manner and generate a trigger signal. The protective target chamber (4) is equipped with a fixed target plate (11) inside, and the sample to be tested (10) is fixed at the center of the fixed target plate (11). A high-speed infrared radiation thermometer (8) is used to detect the infrared radiation on the surface of the sample to be tested (10) and output the original voltage signal. A high-speed camera (9) is used to synchronously acquire visible light image sequences of the ignition and combustion process of the sample to be tested (10); The optical path integration system includes a prism (5) and / or a reflector for folding and integrating the optical path so that the field of view of the high-speed infrared radiation thermometer (8) and the high-speed camera (9) are aligned with the same area on the surface of the sample to be tested (10). A synchronous trigger (7) is connected to the magnetic speed measurement system (2) and is used to synchronously start the high-speed infrared radiation thermometer (8) and the high-speed camera (9) when the magnetic speed measurement system (2) is triggered.

2. The synchronous testing device for the transient ignition temperature and reaction process of explosives according to claim 1, characterized in that, The optical path integration system also includes a mirror assembly; The direction of the light path is adjusted by the reflector group to reduce ambient light interference.

3. The synchronous testing device for the transient ignition temperature and reaction process of explosives according to claim 1, characterized in that, The high-speed infrared radiation thermometer (8) operates in the 3-5μm band, and its output original voltage signal is calculated as a temperature value based on Planck's blackbody radiation law.

4. The synchronous testing device for the transient ignition temperature and reaction process of explosives according to claim 1, characterized in that, The protective target chamber (4) has an observation window (12) on its side wall. The optical path integration system, the high-speed infrared radiation thermometer (8) and the high-speed camera (9) are all aligned with the sample to be tested (10) through the observation window (12).

5. A method for synchronously testing the transient ignition temperature and reaction process of an explosive, characterized in that, This method is used in a synchronous testing device for the transient ignition temperature and reaction process of an explosive as described in any one of claims 1-4, and includes the following steps: Explosives of a set size and density were prepared as test samples (10). The emissivity of the sample surface was calibrated using a blackbody furnace combined with an infrared thermometer, and emissivity-temperature relationship data were established. The sample to be tested (10) is fixed at the center of the fixed target plate (11) of the protective target chamber (4), and the loaded bullet (3) is driven by the light air gun (1) to hit the sample. The magnetic velocity measurement system (2) triggers the synchronous trigger (7) to start the high-speed infrared radiation thermometer (8) and the high-speed camera (9). The original voltage signal on the sample surface is detected by the high-speed infrared radiation thermometer (8), and the visible light image sequence of the ignition and combustion process is acquired by the high-speed camera (9). Based on the emissivity-temperature relationship data and Planck's blackbody radiation law, the original voltage signal is converted into a temperature-time curve; Ignition location, flame propagation speed, and reaction zone morphology evolution are extracted from the visible light image sequence, and the calibrated ignition time is determined. Align the temperature-time curve with the visible light image sequence on the time axis, and determine the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature based on the calibrated ignition time.

6. The method for synchronously testing the transient ignition temperature and reaction process of an explosive according to claim 5, characterized in that, The calibration of sample emissivity using a blackbody furnace combined with an infrared thermometer includes: The sample to be tested (10) is placed in a blackbody furnace and stabilized at a known temperature. The first response voltage of the infrared thermometer to the blackbody furnace and the second response voltage of the sample to be tested (10) are recorded. The sample emissivity is determined by the ratio of the second response voltage to the first response voltage, and stored as emissivity-temperature relationship data.

7. The method for synchronously testing the transient ignition temperature and reaction process of an explosive according to claim 5, characterized in that, The step of converting the original voltage signal into a temperature-time curve based on the emissivity-temperature relationship data and Planck's blackbody radiation law includes: Based on Planck's blackbody radiation law, the original voltage signal is converted into a temperature value through inversion using the calibrated sample emissivity and temperature response function, thereby generating the temperature-time curve.

8. The method for synchronously testing the transient ignition temperature and reaction process of an explosive according to claim 5, characterized in that, The temperature value inversion conversion is calculated using Wien's displacement law or band brightness thermometry.

9. The method for synchronously testing the transient ignition temperature and reaction process of an explosive according to claim 5, characterized in that, The method also includes: After fixing the sample to be tested (10) to the fixed target plate (11) of the protective target chamber (4), the inside of the protective target chamber (4) is evacuated.

10. The method for synchronously testing the transient ignition temperature and reaction process of an explosive according to claim 5, characterized in that, The determination of the ignition temperature threshold and the correlation characteristics between the reaction stage and temperature include: Determine the impact ignition temperature threshold corresponding to the instant of ignition; Determine the temperature change characteristics at different stages of reaction development, including ignition, rapid combustion, and stable combustion; And / or, determine a quantitative relationship between temperature changes and the severity of the reaction, the severity of which is determined by changes in image brightness and / or area.

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