A device and method for detecting explosive gas by multiple quantitative detection

Abstract

The present invention discloses a device and a detection method for multiple quantitative detection of explosive gases, the device includes an air intake device, a light shield, a sample cell, an air outlet device, a light source assembly and a bracket; a lithium battery, a spectrometer, an optical fiber and a computer display unit are arranged in the bracket; the air intake device is installed above the light shield; the sample cell is installed above the bracket, and a plurality of slots for fixing fluorescent films are provided on the sample cell. During detection, the present invention makes a plurality of fluorescent films such as M‑DAA contact with the explosive gas to be tested of the nitro aromatic compound type, and charge transfer occurs, so that the M‑DAA produces fluorescence changes, and then the generated fluorescence signal is converted into an electrical signal by a fluorescence detector, and the concentration of the nitro aromatic compound in the measured gas is displayed after data processing, that is, the concentration of the nitro aromatic compound is reflected by detecting the fluorescence intensity. The present invention can sensitively respond to and quantitatively linearly detect a plurality of nitro aromatic compound explosive gases.

Description

Technical Field

[0001] The present invention relates to a device and method for detecting explosives in the technical field of gas monitoring, and in particular to a device and method for detecting explosive gases in multiple quantitative ways. Background Art

[0002] In recent years, the types of explosives have increased and the products have become increasingly complex, posing a serious threat to social public security and people's living environment. How to effectively and accurately detect explosives is a problem that needs to be solved urgently.

[0003] Nitroaromatic compounds are the most common and widely used type of explosives, mainly including nitroaromatic compounds such as 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), picric acid (PA) and nitrobenzene (NB).

[0004] Currently, most commercial detectors are based on sensors made of conductive materials, semiconductor materials or magnetoelectric materials. However, these sensors often require higher operating temperatures, have lower detection sensitivity and are easily interfered by other common pollutants or volatile substances.

[0005] With the development of optical technology, fluorescence detection systems based on colorimetric or fluorescent probes have also made some progress. Fluorescence detection systems have been widely used in many fields, such as the detection of fruit quality, pesticide residues and water quality.

[0006] Although there are reports on the use of fluorescent probe materials for multiple quantitative linear detection of a variety of nitroaromatic compounds, most of the detection equipment is large-scale laboratory instruments that are complicated to operate and require professionals to perform, and cannot achieve real-time detection. However, the development of portable fluorescence detection devices still has its difficulties, and has not yet been resolved in the market. This is attributed to the high technical and cost requirements of multiple linear detection equipment. In addition, high-sensitivity fluorescence detection systems are generally suitable for the detection of small amounts of gas. If the amount of gas is too large, the fluorescence detection system will be seriously depleted, which to a certain extent increases its cost and makes it lose its advantage in market competition. Therefore, the equipment also needs a quantitative inlet and outlet device to prevent excessive gas from causing damage to the detection system.

[0007] Therefore, in view of the above-mentioned needs and problems, how to sensitively respond to a variety of nitroaromatic explosives and perform quantitative linear detection has become a technical problem that needs to be solved urgently. Summary of the invention

[0008] Purpose of the invention: In view of the deficiencies in the prior art, the present invention provides a device and a method for multiple quantitative detection of explosive gases. The device is a portable device and can sensitively respond to and quantitatively linearly detect explosive gases of various nitroaromatic compounds.

[0009] Technical solution: The device for multiple quantitative detection of explosive gas of the present invention comprises an air inlet device, a light shield, a sample pool, an air outlet device, a light source assembly and a bracket;

[0010] The bracket contains a lithium battery, a spectrometer, an optical fiber, and a computer display unit;

[0011] The air inlet device is installed above the light shield; the sample pool is installed above the bracket, and a plurality of slots for fixing the fluorescent film are opened on the sample pool;

[0012] The air intake device is embedded in the upper part of the sunshade;

[0013] The optical fiber, gas outlet device, lithium battery and spectrometer are installed at the bottom of the sample pool.

[0014] The air intake device comprises an electric push rod, an air intake port and an air outlet; a valve is arranged at the air intake port, and a valve is arranged at the air outlet. The electric push rod draws gas into the air intake device through the opening and closing of the valve at the air intake port and the valve at the air outlet.

[0015] The sample pool comprises a sample placement unit, a filter placement unit and a focusing reflector. The inner wall of the sample placement unit is provided with a filtering lens, and the focusing reflector is located above the filter placement unit.

[0016] The sample placement unit comprises a plurality of fluorescent film placement units, a plurality of light source interfaces and a fixing component, and the plurality of fluorescent film placement units are located inside the sample placement unit.

[0017] The light source assembly comprises a plurality of light sources with different wavelengths, and the plurality of light sources with different wavelengths are installed on the sample placement unit through a light source interface.

[0018] The method for multiple quantitative detection of explosive gas of the present invention comprises the following steps:

[0019] (1) Preparation of various fluorescent films:

[0020] (1.1) H 2 DAA and metal salt were placed in a mortar according to the mass ratio, DMF was added, and after grinding, they were washed with ethanol and dried in a vacuum drying oven to obtain a fluorescent material with the chemical formula [M-DAA(DMF)]·H 2 O, abbreviated as M-DAA, H 2 DAA is 9,10-anthracene diacrylate, DMF is N,N-dimethylformamide; the metal salt is M(NO 3 )2 ·xH 2 O or MCl 2 ·yH 2 O, wherein M is one of Zn or Cd, x=4, 6, y=0, 2.5, 4;

[0021] Dispersing the prepared fluorescent material in ethanol to obtain a mixture, and treating the mixture overtime to achieve uniform dispersion;

[0022] Cleaning transparent quartz glass, placing the quartz glass on a coating machine, spin-coating a fluorescent material dispersion onto the quartz glass to obtain a fluorescent film, and then drying the fluorescent film in a vacuum to remove residual ethanol;

[0023] (2) performing multiple quantitative detection: placing the multiple fluorescent films prepared in step (1) in multiple fluorescent film placement units in the sample placement unit, opening the valve of the air inlet on the air inlet device, and the electric push rod sucking the explosive gas to be tested into the cavity of the air inlet device through the air inlet. After the required gas volume is reached, the valve of the air inlet is closed, and the electric push rod is pushed to push the explosive gas to be tested into the cavity through the air outlet. At the same time, turning on the light source component, the excitation light emitted by the light source component is irradiated onto the corresponding fluorescent film, and the multiple fluorescent films emit different fluorescence under the action of the excitation light. The fluorescence passes through the filter on the filter placement unit to filter out the excitation light and stray light, and then shines on the focusing reflector. The focusing reflector focuses and reflects the fluorescence onto the optical fiber. The optical fiber transmits the light signal to the spectrometer, and the spectrometer converts the light signal into a digital signal. The spectrometer outputs different digital signals to the computer display unit according to different fluorescence intensities. The digital signal is the concentration of the nitroaromatic compound.

[0024] The method for multiple quantitative detection of explosive gas of the present invention comprises the following steps:

[0025] (1) Preparation of various fluorescent films:

[0026] (1.1) Preparation of the first fluorescent film: 2 DAA and Cd(NO 3 ) 2 ·2H 2 O is placed in a mortar according to the mass ratio, DMF is added, the material is ground, washed with ethanol, and dried in a vacuum drying oven to obtain a first fluorescent material;

[0027] Dispersing the prepared first fluorescent material in ethanol to obtain a first mixture, and treating the first mixture overtime to be uniformly dispersed;

[0028] Cleaning the quartz glass, placing the quartz glass on a coating machine, spin-coating the first mixture dispersion onto the quartz glass to obtain a first fluorescent film, and then drying the first fluorescent film in a vacuum until residual ethanol is removed;

[0029] (1.2) Preparation of the second fluorescent film: 2 DAA and ZnCl 2 Place in a mortar according to the mass ratio, add DMF and grind, wash with ethanol and place in a vacuum drying oven to dry, to obtain a second fluorescent material;

[0030] dispersing the prepared second fluorescent material in ethanol to obtain a second mixture, and treating the second mixture overtime to be uniformly dispersed;

[0031] Cleaning the transparent quartz glass, placing the quartz glass on a coating machine, spin-coating the second mixture dispersion onto the quartz glass to obtain a second fluorescent film, and then drying the second fluorescent film in a vacuum until the residual ethanol is removed;

[0032] (1.3) Preparation of the third fluorescent film: 2 DAA and Mn(ClO 4 ) 2 6H 2 O is placed in a mortar according to the mass ratio, DMF is added and ground, washed with ethanol and then placed in a vacuum drying oven to dry, to obtain a third fluorescent material;

[0033] dispersing the prepared third fluorescent material in ethanol to obtain a third mixture, and treating the third mixture overtime to be uniformly dispersed;

[0034] Cleaning the transparent quartz glass, placing the quartz glass on a coating machine, spin-coating the third mixture dispersion onto the quartz glass to obtain a third fluorescent film, and then drying the third fluorescent film in a vacuum until the residual ethanol is removed;

[0035] (2) performing multiple quantitative detection: placing the multiple fluorescent films prepared in step (1) in multiple fluorescent film placement units in the sample placement unit, opening the valve of the air inlet on the air inlet device, and sucking the explosive gas to be tested into the cavity of the air inlet device through the air inlet by the electric push rod. After the required gas volume is reached, the valve of the air inlet is closed, and the electric push rod is pushed to push the explosive gas to be tested into the cavity through the air outlet. At the same time, the light source assembly is installed on the outer side of the sample placement unit, and the light source assembly is turned on. The excitation light emitted by the light source assembly is irradiated onto the corresponding fluorescent film. The multiple fluorescent films emit different fluorescence under the action of the excitation light. The fluorescence passes through the filter on the filter placement unit to filter out the excitation light and stray light, and then shines on the focusing reflector. The focusing reflector focuses and reflects the fluorescence onto the optical fiber. The optical fiber transmits the light signal to the spectrometer, and the spectrometer converts the light signal into a digital signal. The spectrometer outputs different digital signals to the computer display unit according to different fluorescence intensities. The digital signal is the concentration of the nitroaromatic compound.

[0036] In step (1.1), the first fluorescent film is prepared by: 2 DAA and Cd(NO 3 ) 2 ·2H 2 O is placed in a mortar at a mass ratio of 1:2, 5-15 μl of DMF is added, ground for several minutes, washed with ethanol, and then placed in a vacuum drying oven to dry, to obtain a first fluorescent material;

[0037] 10 mg of the first fluorescent material is dispersed in 2 mL of ethanol to obtain a first mixture, and the first mixture is treated overtime for several hours to achieve uniform dispersion;

[0038] The quartz glass was cleaned and placed on a coating machine, 100 μL of the first mixture dispersion was spin-coated on the quartz glass to obtain a first fluorescent film, and then the first fluorescent film was dried in a vacuum at a temperature below 50° C. to remove the residual ethanol.

[0039] In step (1.2), the second fluorescent film is prepared by: 2 DAA and ZnCl 2 Place in a mortar at a mass ratio of 1:2, add 5-15 μl of DMF and grind, wash with ethanol and place in a vacuum drying oven to dry, to obtain a second fluorescent material;

[0040] 10 mg of the second fluorescent material is dispersed in 2 mL of ethanol to obtain a second mixture, and the second mixture is treated overtime for several hours to achieve uniform dispersion;

[0041] The quartz glass was cleaned and placed on a coating machine, 100 μL of the second mixture dispersion was spin-coated on the quartz glass to obtain a second fluorescent film, and then the second fluorescent film was dried in a vacuum at a temperature below 50° C. to remove the residual ethanol.

[0042] In step (1.3), the third fluorescent film is prepared by: 2 DAA and Mn(ClO 4 ) 2 6H 2 O is placed in a mortar at a mass ratio of 1:2, 8-20 μl of DMF is added and ground, washed with ethanol and dried in a vacuum drying oven to obtain a third fluorescent material;

[0043] 10 mg of the third fluorescent material is dispersed in 2 mL of ethanol to obtain a third mixture, and the third mixture is treated overtime for several hours to achieve uniform dispersion;

[0044] The quartz glass was cleaned and placed on a coating machine, 100 μL of the third mixture dispersion was spin-coated on the quartz glass to obtain a third fluorescent film, and then the third fluorescent film was dried in a vacuum at a temperature below 50° C. to remove the residual ethanol.

[0045] Working principle: The present invention allows a variety of fluorescent films such as M-DAA to contact with the explosive gas to be tested, which is a nitro aromatic compound, to cause charge transfer, thereby causing M-DAA to produce fluorescence changes, and then the generated fluorescence signal is converted into an electrical signal through a fluorescence detector. After data processing, the concentration of nitro aromatic compounds in the measured gas (2,4-dinitroaniline, p-2,4-dinitrotoluene, 2-nitrophenol, 4-nitrophenol, 2-nitrotoluene, 4-nitrotoluene, 4-nitroacetophenone, nitrobenzene) is displayed, that is, the concentration of nitro aromatic compounds is reflected by detecting the fluorescence intensity.

[0046] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0047] (1) Compared with other detection methods such as electrochemical method and chromatography, the method of the present invention has the advantages of high sensitivity, fast response, convenient operation and dynamic continuous monitoring.

[0048] (2) The present invention selects materials such as M-DAA as fluorescent film materials, and then performs multiple linear detection on explosive gases of various nitroaromatic compounds.

[0049] (3) The device for multiple quantitative detection of explosive gas of the present invention can place multiple fluorescent films and realize quantitative and timed sampling of explosive gas, making the result more accurate.

[0050] (4) The device of the present invention has a compact structure, is easy to carry, simple to operate, and has high sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the overall structure of the device for multiple quantitative detection of explosive gas of the present invention;

[0052] Figure 2 It is a diagram of the internal structure of the device for multiple quantitative detection of explosive gas of the present invention;

[0053] Figure 3 is a schematic diagram of a sample placement unit of the present invention;

[0054] Figure 4 is a schematic diagram of an air intake device of the present invention;

[0055] Figure 5 is a schematic diagram of a filter placement unit of the present invention;

[0056] Figure 6 It is a schematic diagram of the optical fiber used in the present invention. DETAILED DESCRIPTION

[0057] like Figures 1 to 6As shown, the device for multiple quantitative detection of explosive gas of the present invention comprises an air inlet device 1, a light shield 2, a sample pool 3, an air outlet device 4, a light source assembly 5 and a bracket 6.

[0058] The support 6 is provided with a lithium battery 6.1, a spectrometer 6.2, an optical fiber 6.3 and a computer display unit 6.4. The air inlet device 1 is installed above the light shield 2; the sample pool 3 is installed above the support 6, and a plurality of slots for fixing the fluorescent film are opened on the sample pool 3. The air inlet device 1 is embedded in the upper part of the light shield 2; the optical fiber 6.3 and the air outlet device 4, the lithium battery 6.1 and the spectrometer 6.2 are installed at the bottom of the sample pool 3.

[0059] The air intake device 1 comprises an electric push rod 1.1, an air inlet 1.2, a valve 1.3 and an air outlet 1.4. When the device is turned on, the valve 1.3 at the air inlet is opened, and the explosive gas to be tested enters the device under the pull of the electric push rod 1.1; then the valve 1.3 at the air inlet is closed, and the valve 1.3 at the air outlet is opened, and the gas is pumped into the device under the push of the electric push rod 1.1.

[0060] The sample pool 3 includes a sample placement unit 3.3, a filter placement unit 3.2 and a focusing reflector 3.1. The sample placement unit 3.3 has a filter lens on its inner wall, and the filter placement unit 3.2 has a focusing reflector 3.1 for reflection on the upper part, which reflects the light signal to the optical fiber 6.3. The film is irradiated with light sources of different wavelengths to emit fluorescence, and the fluorescence is transmitted through the filter lens and the reflector to the optical fiber 6.3, and the optical fiber transmits the light signal to the spectrometer 6.2, and the spectrometer outputs different voltage performances to the computer display unit 6.4 according to different fluorescence intensities.

[0061] The sample placement unit 3.3 includes multiple fluorescent film placement units on the inside, a light source interface on the outside, and a fixing component, such as a fixing thread at the bottom. The filter placement unit 3.2 is fixed to the center of the sample pool through a thread, and light sources of different wavelengths are fixed to the sample placement unit 3.3 through an interface on the outside. The light source emits excitation light to the fluorescent film, and the fluorescent film emits fluorescence. The excitation light and stray light are filtered out through the filter and shined on the reflector 3.1, and the reflector transmits the light signal to the optical fiber 6.3. Among them, in this embodiment, there are 3 film placement units on the inside of the sample placement unit 3.3 and 3 light source interfaces on the outside. A variety of different nitroaromatic compound explosive gases are detected based on a variety of film materials.

[0062] The light shield 2 is made of plastic and has an opening at the top. The air intake device 1 is installed on the light shield 2. The sample pool 3 is installed on the upper part of the bracket 6. There are multiple notches for fixing the fluorescent film on the inner side, and corresponding screw holes are opened on the outer side for installing the light source assembly 5. The air intake device 1 is installed above the light shield 2. The air intake device 1 has a valve and an electric push rod. The lithium battery 6.1 is set at the bottom of the bracket 6. The push rod is connected to the lithium battery 6.1. After turning on the switch, the air intake device quantitatively injects external gas.

[0063] The computer display unit 6.4 includes a single chip microcomputer and a display screen, which are connected to the display screen and installed inside the housing of the device of the present invention. After the device for detecting explosive gas of the present invention is started, the single chip microcomputer system is initialized, the signal after noise filtering is processed, and finally transmitted to the display screen to display the concentration of the nitroaromatic compound in the explosive gas measured.

[0064] The preparation method of the fluorescent film in the present invention is:

[0065] H 2 DAA and metal salt were placed in a mortar at a mass ratio of 1:2, 5-15 μl of DMF was added, and the mixture was ground for 30 minutes, washed with ethanol three times, and dried in a vacuum oven at 45°C to obtain the target fluorescent material, which was a yellow needle-shaped crystal. Its chemical formula was [M-DAA(DMF)]·H 2 O, abbreviated as M-DAA, H 2 DAA is 9,10-diacrylanthracene, DMF is N,N-dimethylformamide; the metal salt is M(NO 3 ) 2 ·xH 2 O or MCl 2 ·yH 2 O, wherein M is any one of Zn or Cd, x=4, 6, y=0, 2.5, 4.

[0066] 10 mg of the prepared target fluorescent material was dispersed in 2 mL of ethanol to obtain a mixture, and the mixture was treated overtime for three hours to achieve uniform dispersion.

[0067] A quartz glass with a diameter of 1 inch was cleaned and then placed on a spin coater. 100 μL of the fluorescent material dispersion was spin-coated onto the transparent quartz glass at a rotation rate of 10 Hz to obtain a fluorescent film. The fluorescent film was then dried in a vacuum at 50° C. for 6 hours to remove residual ethanol.

[0068] In the embodiment of the present invention, taking the placement of three fluorescent film placement units as an example, the method for multiple quantitative detection of explosive gas includes the following steps:

[0069] (1) Preparation of various fluorescent films:

[0070] (1.1) Preparation of the first fluorescent film: 2 DAA and Cd(NO 3 ) 2 ·2H 2 O is placed in a mortar at a mass ratio of 1:2, 5-15 μl of DMF is added, ground for several minutes, washed with ethanol, and then placed in a vacuum drying oven to dry, to obtain a first fluorescent material;

[0071] 10 mg of the first fluorescent material is dispersed in 2 mL of ethanol to obtain a first mixture, and the first mixture is treated overtime for several hours to achieve uniform dispersion;

[0072] A quartz glass with a diameter of 1 inch was cleaned and placed on a coating machine. 100 μL of the first mixture dispersion was spin-coated on the quartz glass at a speed of 10 Hz to obtain a first fluorescent film. The first fluorescent film was then dried in a vacuum at a temperature below 50° C. for 6 hours to remove residual ethanol.

[0073] (1.2) Preparation of the second fluorescent film: 2 DAA and ZnCl 2 Place in a mortar at a mass ratio of 1:2, add 5-15 μl of DMF and grind for 30 minutes, wash with ethanol three times and dry in a vacuum drying oven at 45°C to obtain a second fluorescent material, which is a yellow needle-shaped crystal;

[0074] 10 mg of the second fluorescent material is dispersed in 2 mL of ethanol to obtain a second mixture, and the second mixture is treated overtime for 3 hours to achieve uniform dispersion;

[0075] The quartz glass is cleaned. In this embodiment, the diameter of the quartz glass is 1 inch. The quartz glass is placed on a coating machine, and 100 μL of the second mixture is spin-coated onto the quartz glass at a rotation rate of 10 Hz to obtain a second fluorescent film. The second fluorescent film is then dried in a vacuum at a temperature below 50° C. for 6 hours to remove residual ethanol.

[0076] (1.3) Preparation of the third fluorescent film: 2 DAA and Mn(ClO 4 ) 2 6H 2 O is placed in a mortar at a mass ratio of 1:2, 8-20 μl of DMF is added and ground, washed with ethanol and dried in a vacuum drying oven to obtain a third fluorescent material;

[0077] 10 mg of the third fluorescent material is dispersed in 2 mL of ethanol to obtain a third mixture, and the third mixture is treated overtime for several hours to achieve uniform dispersion;

[0078] The quartz glass was cleaned and placed on a coating machine, 100 μL of the third mixture was spin-coated on the quartz glass to obtain a third fluorescent film, and then the third fluorescent film was dried in a vacuum at a temperature below 50° C. to remove the residual ethanol.

[0079] (2) Performing multiple quantitative detection: placing the multiple fluorescent films prepared in step (1) in the multiple fluorescent film placement units in the sample placement unit 3.3, opening the valve 1.3 of the air inlet on the air inlet device 1, pulling the electric push rod 1.1 outward, and sucking the explosive gas to be tested into the cavity of the air inlet device through the air inlet 1.2. After reaching the required gas volume, the valve 1.3 of the air inlet is closed, and the electric push rod 1.1 is pushed to push the explosive gas to be tested into the cavity through the air outlet 1.4; at the same time, installing the light source assembly on the outside of the sample placement unit 3.3, turning on the light source assembly, and emitting light. The excitation light emitted by the source component is irradiated onto the corresponding fluorescent film. The various fluorescent films emit different fluorescence under the action of the excitation light. The fluorescence passes through the filter on the filter placement unit 3.2 to filter out the excitation light and stray light, and then irradiates the focusing reflector 3.1. The focusing reflector 3.1 focuses and reflects the fluorescence onto the optical fiber 6.3. The optical fiber 6.3 transmits the optical signal to the spectrometer 6.2. The spectrometer 6.2 converts the optical signal into a digital signal. The spectrometer outputs different digital signals to the computer display unit 6.4 according to different fluorescence intensities. The digital signal is the concentration of the nitroaromatic compound.

[0080] The light source assembly 5 includes a plurality of light sources with different wavelengths, which are mounted on the sample placement unit 3.3 through a light source interface. Filters for filtering different wavelengths are mounted on the filter placement unit 3.2.

Claims

1. A method for multiple quantitative detection of explosive gas, characterized in that: A device for multiple quantitative detection of explosive gas is used for detection, wherein the device for multiple quantitative detection of explosive gas comprises an air intake device (1), a light shield (2), a sample pool (3), an air outlet device (4), a light source assembly (5) and a bracket (6); The support (6) is provided with a lithium battery (6.1), a spectrometer (6.2), an optical fiber (6.3) and a computer display unit (6.4); The air intake device (1) is installed above the light shield (2); the sample pool (3) is installed above the bracket (6), and the sample pool (3) is provided with a plurality of slots for fixing the fluorescent film; The air intake device (1) is embedded in the upper part of the light shield (2); The optical fiber (6.3), the gas outlet device (4), the lithium battery (6.1) and the spectrometer (6.2) are installed at the bottom of the sample pool (3); The air intake device (1) comprises an electric push rod (1.1), an air intake port (1.2) and an air outlet (1.4); a valve (1.3) is provided at the air intake port (1.2), and a valve (1.3) is provided at the air outlet (1.4); the electric push rod (1.1) sucks gas into the air intake device (1) by opening and closing the valve at the air intake port and the valve at the air outlet; The sample pool (3) comprises a sample placement unit (3.3), a filter placement unit (3.2) and a focusing reflector (3.1); the inner wall of the sample placement unit (3.3) is provided with a filtering lens, and the focusing reflector (3.1) is located above the filter placement unit (3.2); The method comprises the following steps: (1) Preparation of various fluorescent films: (1.1) H2DAA and metal salt are placed in a mortar according to a mass ratio, DMF is added, the mixture is ground, washed with ethanol, and dried to obtain a fluorescent material; the prepared fluorescent material is dispersed in ethanol to obtain a mixture; quartz glass is placed on a coating machine, the mixture is spin-coated on the quartz glass to obtain a fluorescent film, and the film is dried; (2) Performing multiple quantitative detection: placing multiple fluorescent films in multiple fluorescent film placement units, opening the valve (1.3) of the air inlet, and the electric push rod (1.1) sucking the explosive gas to be tested into the air inlet device cavity through the air inlet (1.2), closing the valve (1.3) of the air inlet, and pushing the explosive gas to be tested into the air outlet (1.4); the excitation light emitted by the light source assembly is irradiated onto the corresponding fluorescent film, and the fluorescence is irradiated onto the focusing reflector (3.1) through the filter on the filter placement unit (3.2), and the focusing reflector (3.1) focuses and reflects the fluorescence onto the optical fiber (6.3), and the optical fiber (6.3) transmits the light signal to the spectrometer (6.2), and the spectrometer (6.2) converts the light signal into a digital signal, and the spectrometer outputs different digital signals to the computer display unit (6.4) according to different fluorescence intensities, and the digital signal is the concentration of the nitroaromatic compound.

2. The method for multiple quantitative detection of explosive gas according to claim 1, characterized in that: The process of step (1.1) is: (1.1) Preparation of the first fluorescent film: H2DAA and Cd(NO3)2·2H2O are placed in a mortar, DMF is added, and the mixture is ground, washed with ethanol, and dried to obtain a first fluorescent material; the first fluorescent material is dispersed in ethanol to obtain a first mixture; quartz glass is placed on a coating machine, and the first mixture is spin-coated onto the quartz glass to obtain a first fluorescent film, and the mixture is dried; (1.2) Preparation of the second fluorescent film: H2DAA and ZnCl2 are placed in a mortar, DMF is added and ground, washed with ethanol and dried to obtain a second fluorescent material; the second fluorescent material is dispersed in ethanol to obtain a second mixture; quartz glass is placed on a coating machine, the second mixture is spin-coated on the quartz glass to obtain a second fluorescent film and dried; (1.3) Preparation of the third fluorescent film: H2DAA and Mn(ClO4)2·6H2O are placed in a mortar, DMF is added and ground, washed with ethanol and dried to obtain a third fluorescent material; the third fluorescent material is dispersed in ethanol to obtain a third mixture; quartz glass is placed on a coater, the third mixture is spin-coated onto the quartz glass to obtain a third fluorescent film and dried.

3. The method for multiple quantitative detection of explosive gas according to claim 1, characterized in that: In step (1.1), the first fluorescent film is prepared by placing H2DAA and Cd(NO3)2·2H2O in a mortar at a mass ratio of 1:2, adding 5-15 μl of DMF, grinding and washing with ethanol to obtain a first fluorescent material.

4. The method for multiple quantitative detection of explosive gas according to claim 1, characterized in that: In step (1.2), the second fluorescent film is prepared by placing H2DAA and ZnCl2 in a mortar at a mass ratio of 1:2, adding 5-15 μl of DMF and grinding, washing with ethanol and drying in a vacuum drying oven to obtain a second fluorescent material.

5. The method for multiple quantitative detection of explosive gas according to claim 1, characterized in that: In step (1.3), the third fluorescent film is prepared by placing H2DAA and Mn(ClO4)2·6H2O in a mortar at a mass ratio of 1:2, adding 8-20 μl of DMF and grinding, washing with ethanol and drying in a vacuum drying oven to obtain a third fluorescent material.

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