Spectroscopy system for rapid detection of spatiotemporal correlation gas products of energetic materials

Abstract

The present application relates to a kind of energetic material space-time related gas product rapid detection spectrum system, belong to energetic material space-time related gas product detection field.The system will pulse laser act on energetic material and induce to produce gas, obtain the spectrum of space-time related gas product by laser-induced breakdown spectroscopy technology quickly, realize the rapid detection of energetic material gas product.The system will also combine laser-induced breakdown spectroscopy technology, gas sensing module and tunable diode laser absorption spectroscopy (TDLAS) technology together, and interactively detect gas product.The present application can realize the research under different vacuum degree and different gas environment, realize the rapid analysis of energetic material space-time related gas product, and it is important to the performance evaluation of energetic material.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of energetic material space-time related gas product rapid detection spectrum system, belong to energetic material space-time related gas product detection field. BACKGROUND

[0002] The gas phase product composition and condensed phase product analysis of energetic material thermal decomposition and combustion process are the basis for studying combustion mechanism and establishing combustion model. Only by providing a large number of gas phase and condensed phase kinetics can a clear and definite combustion mechanism be given to reasonably evaluate the combustion performance.

[0003] The determination of gaseous detonation products, especially the determination of the generation sequence of gaseous detonation products, can effectively improve the calculation accuracy of explosion heat and explosion volume, explosion pressure and explosion speed, and explosion temperature. Currently, it is very difficult to accurately determine the gaseous detonation products, and it is more difficult to determine the generation sequence of detonation products. The use of laser-induced breakdown spectroscopy and other related spectroscopy techniques can effectively measure the generation sequence and other dynamic processes of gaseous detonation products, and this method is safe, reliable, fast and accurate, and has important significance for performance evaluation of energetic materials. SUMMARY

[0004] The purpose of the present application is to solve the problem that the determination of gaseous detonation products and their generation sequence of high-performance energetic materials is difficult, which leads to low calculation accuracy of explosion heat and explosion volume, explosion pressure and explosion speed, and explosion temperature. A gaseous detonation product rapid detection spectrum system with time resolution and spatial correlation based on laser-induced breakdown spectroscopy technology is proposed. The present application improves the accuracy and precision of detection by interactive detection of TDLAS module, gas electrochemical sensor module and laser-induced breakdown spectroscopy module.

[0005] The method of the present application is realized by the following technical scheme.

[0006] The energetic material space-time related gas product rapid detection spectrum system comprises: a sealed gas chamber, a three-dimensional automatic sample stage, a nanosecond pulse laser, a delay trigger, a spectrometer, a TDLAS module, a gas sensor module, a vacuum tube, a molecular pump, a vacuum valve, a barometer, a laser reflector, a fused quartz converging lens, a fused quartz window, a dichroic mirror, a vacuum air release valve, an air outlet pipe, an air inlet pipe and a particle adsorption device.

[0007] The nanosecond pulse laser is used to ablate the sample to produce gas products, and the second laser is used to excite the gas products to produce plasma.

[0008] The collection spectrometer is used for laser-induced plasma spectrum analysis of gas products.

[0009] The delay flip-flop is used for controlling the delay time between the two pulse lasers and between the pulse laser and the spectrometer, so as to realize the time-resolved gas product spectrum acquisition.

[0010] The TDLAS module is used for detecting the composition and concentration of the gas product.

[0011] The gas electrochemical sensor module is used for detecting the composition and concentration of the gas.

[0012] The closed gas chamber can place the electric three-dimensional sample stage, and provides a vacuum and different gas test environment. Each surface of the closed gas chamber has a flange interface, and each surface can be provided with a laser window and a quartz observation window according to needs.

[0013] The three-dimensional electric displacement platform is used for placing the sample to realize the three-dimensional displacement of the sample.

[0014] The molecular pump is used for vacuumizing the system to realize the vacuum test environment.

[0015] The converging lens is used for focusing the laser emitted by the pulse laser on the sample, so that the sample induces the generation of plasma.

[0016] The quartz window is used for observing the situation in the closed gas chamber, and the plasma spectrum can be collected through the quartz window.

[0017] The dichroic mirror is used for transmitting the 1064nm laser and reflecting the ultraviolet band spectrum.

[0018] The gas pressure gauge is used for monitoring the pressure and vacuum degree of the system.

[0019] The vacuum air release valve is used for the closed gas chamber, so that the gas chamber and the outside reach the same air pressure.

[0020] The vacuum pipe is used for transmitting the gas when the system is vacuumized.

[0021] The connection relationship between the above-mentioned constituent components is as follows:

[0022] The two pulse lasers and the spectrometer are connected with the delay flip-flop, and the delay time of the laser and the spectrometer is controlled by the delay flip-flop.

[0023] The observation windows of each surface are connected with the closed gas chamber.

[0024] The molecular pump is connected with the vacuum air release valve, the vacuum valve, the gas pressure gauge and the closed gas chamber through the vacuum pipe.

[0025] The electric three-dimensional displacement stage is placed in the closed gas chamber, and is connected with the program control and display system.

[0026] The particle adsorption device is placed in the closed chamber and connected to the program control and display system.

[0027] The gas sensor module is connected to the closed chamber through a vacuum pipe.

[0028] The TDLAS module is connected to the closed chamber and the program control and display system.

[0029] The method for detecting and analyzing using the system is as follows:

[0030] First step: open the closed chamber, place the sample on the electric three-dimensional displacement table, and close the closed chamber.

[0031] Second step: open the molecular pump to pump out the air in the closed chamber.

[0032] Third step: observe the gas pressure gauge, when the required vacuum degree is reached, close the molecular pump and vacuum valve to maintain the current vacuum degree of the system.

[0033] Fourth step: make the two nanosecond pulse lasers, spectrometer, delay trigger, and TDLAS system all in standby state.

[0034] Fifth step: turn on the delay trigger to set the delay time of the two pulse lasers according to the detection needs, and control the spectrometer to collect spectra at different delays.

[0035] Sixth step: turn on the nanosecond pulse laser to ablate the sample and make the sample decompose into gas products, and the other nanosecond pulse laser induces the gas products to generate plasma, and the spectrum of the gas products is collected through the spectrum collection system.

[0036] Seventh step: according to the detection needs, adjust the position of the sample through the three-dimensional displacement table, and then collect the spectrum at different spatial positions.

[0037] Eighth step: while performing the sixth and seventh steps, turn on the TDLAS system and the gas sensor system to interactively detect with the laser-induced breakdown spectroscopy system.

[0038] Ninth step: use the data processing system to process and analyze the data.

[0039] From now on, the spatiotemporal characteristic analysis of laser-induced gas products of energetic materials is realized.

[0040] Advantages

[0041] 1. The system of the present application integrates laser-induced breakdown spectroscopy technology, gas sensor and TDLAS technology to interactively detect gas products. The vacuum flange is used as a device component, which can realize the research of gas products under different vacuum degrees and different gas environments, and increase the assembly characteristics of the experimental device. The detection module can be added according to the specific experimental requirements, and the application type is more widely used.

[0042] 2. The system of the present application uses laser-induced breakdown spectroscopy technology to rapidly analyze gas products with time and space characteristics in real time, and can further quantitatively analyze the gas products, thereby providing a simple, safe and reliable new method for the research of energetic materials. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a schematic diagram of the rapid detection spectrum system of the time and space related gas products of energetic materials. DETAILED DESCRIPTION

[0044] The present application will be further described in detail below in combination with examples and drawings.

[0045] The rapid detection spectrum system of the time and space related gas products of energetic materials comprises a sealed gas chamber (1), a three-dimensional automatic adjusting sample table (2), a first nanosecond pulse laser (3), a delay trigger (4), a second nanosecond pulse laser (5), a spectrometer (6), a TDLAS module (7), a gas sensor module (8), a vacuum tube (9), a molecular pump (10), a vacuum valve (11), a gas pressure gauge (12), a first laser reflecting mirror (13), a first fused quartz converging lens (14), a first fused quartz window (15), a second fused quartz window (16), a second fused quartz converging lens (17), a dichroic mirror (18), a third fused quartz converging lens (19), a third fused quartz window (20), a fourth fused quartz window (21), a vacuum air release valve (22), an air outlet pipe (23), an air inlet pipe (24) and a particle adsorption device (25).

[0046] The connection relationship is that the top of the closed gas chamber 1 (in this embodiment, the volume is 300mm*300mm*400mm) is provided with a laser quartz window 15, a converging lens 14 is located directly above the laser quartz window 15, and a sample is placed on an electric three-dimensional translation sample table 2. The closed gas chamber 1 is connected to two detection chambers, the detection chambers are composed of vacuum flanges, and the length can be changed according to requirements. One of the detection chambers is provided with a gas sensing module 8, and the other detection chamber is a TDLAS detection module. The closed gas chamber 1 is connected to a molecular pump 10 through a vacuum pipe, the vacuum pipe is provided with a vacuum valve 11, a gas pressure gauge 12 and a vacuum air release valve 22, and is used for observing and controlling the vacuum degree of the whole system. The closed gas chamber 1 is provided with a gas outlet pipe 24 at the lower part and a gas inlet pipe 23 at the upper part, so that the closed gas chamber is in different gas environments. The laser beam emitted by the laser is reflected by a series of half-transmission half-reflection mirrors and laser reflecting mirrors to achieve the effects of light splitting and light path changing. The laser beam of the nanosecond pulse laser 3 is focused through the laser reflecting mirror 13 and the converging lens 14 to ablate the sample to generate gas products; the laser beam of the nanosecond pulse laser 5 is used to induce the gas products to generate plasma through the dichroic mirror 18, and the spectrum of the gas products is collected into the spectrometer 6 through the dichroic mirror 18 and the quartz converging lens 19. The spectrometer 6 is connected to a delay trigger 4, and the delay time of collecting the spectrum is controlled through the delay trigger 4; the nanosecond pulse laser 3 and the nanosecond pulse laser 5 are connected to the delay trigger 4, and the delay time of the two lasers is controlled through the delay trigger 4, so that the gas products with time characteristics are obtained.

[0047] The nanosecond pulse laser has a laser wavelength of 1064nm, a pulse width of 7ns, and a single-pulse laser energy of 50-200mJ@1064nm.

[0048] The spectrum acquisition spectrometer has a spectrum range of 180nm-980nm, a resolution of less than 0.1nm, a minimum gate width integration setting time of 1ms, and a delay that can be adjusted.

[0049] The delay trigger is used for controlling the delay time between the two pulse lasers and between the pulse laser and the spectrometer, and the minimum resolution can reach ps.

[0050] The TDLAS module is used for detecting the composition and concentration of the gas products.

[0051] The gas electrochemical sensor module is used for detecting the composition and concentration of the gas.

[0052] The closed gas chamber can be provided with an electric three-dimensional sample table, and can provide a vacuum and different gas test environments.

[0053] Each surface of the closed gas chamber is provided with a flange interface, and each surface can be provided with a laser window and a quartz observation window according to requirements.

[0054] The three-dimensional electric displacement platform is used for placing a sample to realize three-dimensional displacement of the sample.

[0055] The molecular pump is used for vacuumizing the system to realize a test environment of vacuum.

[0056] The converging lens is used for focusing laser emitted by the pulse laser on the sample to induce the sample to generate plasma.

[0057] The quartz window has a transmittable spectral range of 190nm-2400nm, and plasma spectrum can be collected through the quartz window.

[0058] The dichroic mirror is used for transmitting 1064nm laser and reflecting ultraviolet spectrum.

[0059] The gas pressure gauge is used for monitoring the pressure and vacuum degree of the system.

[0060] The vacuum air release valve is used for sealing the air chamber to make the air chamber and the outside reach the same air pressure.

[0061] The vacuum pipe is used for transmitting gas when the system is vacuumized.

[0062] The working process is as follows: the sealed air chamber is opened, the sample is placed on the electric three-dimensional displacement table, and the sealed air chamber is closed. The molecular pump is opened to extract air in the sealed air chamber. The gas pressure gauge is observed, the molecular pump and the vacuum valve are closed when the required vacuum degree is reached, and the system is kept at the current vacuum degree. The delay trigger is turned on and is adjusted to the internal trigger mode, the frequency is adjusted according to the requirement, the three channels of the delay trigger are connected with two pulse lasers and a spectrometer respectively, the delay time of the two pulse lasers can reach nanosecond level, the spectrum line with time resolution is collected by adjusting the delay trigger, the nanosecond pulse laser is turned on to ablate the sample to decompose the sample into gas products, another nanosecond pulse laser induces the gas products to generate plasma, and the spectrum line of the gas products is collected through the spectrum collection system. According to the detection requirement, the position of the sample is adjusted through the three-dimensional displacement table, and then the spectrum line at different spatial positions is collected; at the same time of collecting the spectrum line, the TDLAS system and the gas sensor system are turned on to interactively detect with the laser-induced breakdown spectroscopy system; then the data processing system is used for processing and analyzing the data.

Claims

1. A rapid detection spectroscopic system for spatiotemporal correlation gaseous products of energetic materials, characterized in that... The system includes: a sealed gas chamber (1), a three-dimensional automatically adjustable sample stage (2), a first nanosecond pulse laser (3), a delay trigger (4), a second nanosecond pulse laser (5), a spectrometer (6), a TDLAS module (7), a gas sensor module (8), a vacuum tube (9), a molecular pump (10), a vacuum valve (11), a pressure gauge (12), a first laser reflector (13), a first fused silica converging lens (14), a first fused silica window (15), a second fused silica window (16), a second fused silica converging lens (17), a dichroic mirror (18), a third fused silica converging lens (19), a third fused silica window (20), a fourth fused silica window (21), a vacuum venting valve (22), an exhaust pipe (23), an inlet pipe (24), and a particle adsorption device (25). A model between the spectrum and gas parameters is established through an intelligent algorithm to achieve quantitative analysis of gaseous products. A molecular pump is used to evacuate a sealed gas chamber, and the pressure gauge is monitored to ensure the vacuum level reaches the desired level. Then, a first nanosecond pulsed laser, focused by a converging lens, ablates the energetic material sample, generating gaseous products. A second nanosecond pulsed laser, also focused by a converging lens, induces gaseous product plasma. A spectrometer collects the spectral lines of the gaseous products using a co-optical system. The interval between the two pulsed laser beams is adjusted using a delay trigger to collect time-sequential gaseous product spectral lines. The sample stage is adjusted in the Z-direction, and spectral lines of the gaseous products are collected in the xy plane at distances of 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm from the positive Z-direction of the sample, respectively, yielding a spatially distributed spectrum. If collecting gaseous product spectral lines in an atmosphere-pressure environment, the spectral lines of air must first be collected as background spectra. Based on models established in both vacuum and air environments, the gaseous products are quantitatively analyzed.

2. The rapid detection spectroscopic system for spatiotemporal correlation gas products of energetic materials as described in claim 1, characterized in that: The first nanosecond pulsed laser ablates the energetic material sample after being focused by a converging lens, thereby generating gaseous products. The second nanosecond pulsed laser induces gaseous product plasma after being focused by a converging lens. The spectrometer collects the spectral lines of the gaseous products through a co-optical path system. The interval between the two pulsed lasers is adjusted by a delay trigger, and the interval can reach the nanosecond level, thus collecting the time-sequential spectral lines of the gaseous products.

3. The rapid detection spectroscopic system for spatiotemporal correlation gas products of energetic materials as described in claim 1, characterized in that: The first nanosecond pulsed laser ablates the energetic material sample after being focused by a converging lens, thereby generating gaseous products. The second nanosecond pulsed laser induces gaseous product plasma after being focused by a converging lens. The spectrometer collects the spectral lines of the gaseous products through a co-optical system. When the interval between the two laser beams is constant, the sample stage is adjusted in the Z direction, and the spectral lines of the gaseous products are collected in the xy plane at distances of 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm from the positive Z direction of the sample, respectively, to obtain a spectrum with spatial distribution.

4. The rapid detection spectroscopic system for spatiotemporal correlation gas products of energetic materials as described in claim 1, characterized in that: The sealed gas chamber (1) can achieve different gas pressure environments and different gas environments. Different vacuum environments can be achieved by using a molecular pump (10). Different gas environments can be achieved by introducing different gases through the gas inlet pipe (24). Therefore, gas product spectra can be collected in different vacuum environments and different gas environments.

5. The rapid detection spectroscopic system for spatiotemporal correlation gas products of energetic materials as described in claim 1, characterized in that: The particle adsorption device (25) can adsorb particulate matter generated by energetic materials, thus avoiding interference of particulate matter with the spectrum.

6. The rapid detection spectroscopic system for spatiotemporal correlation gas products of energetic materials as described in claim 1, characterized in that: The rapid detection spectral system for spatiotemporal correlated gas products of energetic materials combines laser-induced breakdown spectroscopy technology and TDLAS (tunable diode laser absorption spectroscopy) module (7) with a gas sensor module (8). The modules perform interactive measurements to improve the accuracy and precision of the detection.

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