Gas monitoring device

Abstract

A gas monitoring system comprises a fast detection gas circuit unit, a pre-concentration tube module and an ion mobility spectrometer. The gas monitoring system is configured to switch between a real-time sampling monitoring mode and a concentrated sampling monitoring mode. In the real-time sampling monitoring mode, the gas monitoring system is configured to introduce gas through the fast detection gas path unit and detect whether the gas contains a target substance through the ion mobility spectrometer module. And in the concentration sampling monitoring mode, the gas monitoring system is configured to introduce gas into the pre-concentration tube module so as to enrich the gas, and after the enrichment is completed, the enriched target substance is released through analysis treatment and the target substance is detected through the ion mobility spectrometer.

Description

Technical Field

[0001] The invention relates to a gas monitoring device. Background Art

[0002] World security has always been the most important need of mankind. For example, civil air defense projects that can effectively resist nuclear radiation, shock waves and conventional explosions also need to be able to prevent the hazards of chemical agents and radioactive air pollution. Civil air defense projects are indispensable protective shelters.

[0003] In civil air defense projects, ion mobility spectrometry is still the mainstream technology in the process of chemical agent monitoring. The ion mobility detector mainly includes the sampling system, the migration tube detector system, the electronic control system, the alarm display system, etc. The detection sensitivity based on ion mobility spectrometry (IMS) technology is very high, and it can detect extremely low concentrations of chemical agents under specific conditions. For example, the instrument can alarm within 5 seconds when the sarin concentration is ≤1.5mg / m³ and the VX concentration is ≤3mg / m³, which shows that the instrument has a very low detection limit and can quickly and accurately detect trace amounts of chemical agents and industrial toxic gases.

[0004] With the advancement of science and technology, higher and higher requirements are placed on safety monitoring equipment, such as faster response, higher sensitivity, etc. Summary of the invention

[0005] According to a first aspect of the present invention, there is provided a gas monitoring system, comprising:

[0006] Quick inspection gas circuit unit;

[0007] pre-concentrator tube module; and

[0008] An ion mobility spectrometer module, comprising an ion mobility spectrometer, the ion mobility spectrometer being in fluid communication with a fast-test gas path unit and in fluid communication with a pre-concentration tube module;

[0009] Wherein the gas monitoring system is configured to switch between real-time sampling monitoring mode and concentrated sampling monitoring mode:

[0010] In the real-time sampling monitoring mode, the gas monitoring system is configured to introduce gas into the gas through the quick detection gas circuit unit and detect whether the gas contains the target substance through the ion mobility spectrometer module; and

[0011] In the concentrated sampling monitoring mode, the gas monitoring system is configured to introduce gas into the pre-concentration tube module to perform enrichment processing on the gas, and after the enrichment is completed, the enriched target substances are released through analytical processing and the target substances are detected through the ion mobility spectrometer.

[0012] In one embodiment, the gas monitoring system is configured to switch from the real-time sampling monitoring mode to the concentrated sampling monitoring mode based on failure to detect the target substance contained in the gas in the real-time sampling monitoring mode.

[0013] In one embodiment, the quick test gas circuit unit fluid is connected to the sampling gas circuit unit, and the portion of the quick test gas circuit unit that does not enter the ion mobility spectrometer enters the sampling gas circuit unit and is discharged through the sampling gas circuit unit.

[0014] In one embodiment, the pre-concentrator module includes a pre-concentrator, which is configured to perform an enrichment process by adsorbing a target substance in a gas introduced into the pre-concentrator, and to perform a desorption process by heating to desorb the target substance into the gas in the pre-concentrator, and then provide the gas containing the target substance to an ion mobility spectrometer.

[0015] In one embodiment, the gas monitoring system further comprises:

[0016] A three-way valve, the inlet end of the three-way valve is connected to the pre-concentration tube and the quick-test gas circuit unit, and the outlet end of the three-way valve is connected to the sampling gas circuit unit; and

[0017] The gas path system control unit is configured to allow the gas from the fast detection gas path unit to flow to the ion mobility spectrometer through the three-way valve in the real-time sampling monitoring mode, so that part of the gas is introduced into the ion mobility spectrometer and the other part flows into the sampling gas path unit.

[0018] In one embodiment, the gas path system control unit is configured to cut off the flow path from the quick test gas path unit to the ion mobility spectrometer through a three-way valve in the concentrated sampling monitoring mode, allowing the gas passing through the pre-concentration tube to flow to the ion mobility spectrometer, so that part of the gas is introduced into the ion mobility spectrometer and the rest flows into the sampling gas path unit.

[0019] In one embodiment, the pre-concentrator module includes a temperature control unit configured to control the pre-concentrator to be at a first predetermined temperature during the enrichment process, and to control the pre-concentrator to be at a second predetermined temperature during the desorption process, wherein the second predetermined temperature is higher than the first predetermined temperature.

[0020] In one embodiment, the ion mobility spectrometer module is configured to be in real-time sampling monitoring mode and concentrated sampling monitoring mode, the gas in the ion mobility spectrometer module flows out of the ion mobility spectrometer, enters the internal circulation cleaning module of the ion mobility spectrometer module for cleaning, and then the cleaned gas flows into the ion mobility spectrometer.

[0021] In one embodiment, the gas monitoring system further includes an alarm information output unit configured to output information of the target substance when the ion mobility spectrometer module detects the target substance.

[0022] In one embodiment, the gas monitoring system further includes a water-blocking and breathable membrane assembly, which is disposed in the gas path leading to the ion mobility spectrometer so that target substances in the gas from the rapid detection gas path unit and / or the pre-concentration tube can be introduced into the ion mobility spectrometer by permeation.

[0023] In one embodiment, the water-blocking and breathable membrane assembly is further configured to remove water molecules from the gas.

[0024] It will be apparent to those skilled in the art that the various aspects and features of the present invention set forth above or below may be combined with various other aspects and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which:

[0026] Figure 1 A schematic diagram of a gas monitoring system according to an embodiment of the present invention is depicted, wherein lines with arrows represent gas paths, lines without arrows represent control lines or circuits, and dotted lines represent schematic routes for target substances to be introduced into the ion mobility spectrometer from left to right. DETAILED DESCRIPTION

[0027] The present disclosure has multiple embodiments, which are provided in order to better understand the technical solutions and inventive concepts of the present disclosure in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure are not intended to limit the scope of the present disclosure.

[0028] At present, high sensitivity, integration, miniaturization, intelligence, automation, modularization, and cross-disciplinary integration are the main development directions of analysis and monitoring instruments. In view of the strong toxicity, long duration, and wide killing range of chemical agents, ion mobility spectrometry is still the mainstream technology for trace chemical agent detection. However, in civil air defense projects with high chemical defense levels, such as Class A sites, 1.5 mg / m 3 (0.262ppm) of sarin and 1.5mg / m 3 (0.202ppm) of soman will give an accurate alarm within 5s; for 4mg / m 3 (0.367ppm) VX response time is no more than 10s; for 20mg / m 3 The response time of mustard gas (3.08ppm) is no more than 20s. In spaces that require long-term monitoring, the concentration of sarin to be detected cannot be greater than 2.0×10 -3 mg / m 3 This puts higher demands on the equipment. Currently, general equipment cannot meet the requirements, and there is an urgent need to develop ultra-high sensitivity chemical agent monitoring equipment.

[0029] The present invention provides a gas monitoring system for detecting, for example, chemical toxic agents, which has ultra-high sensitivity and can reduce the concentration monitoring lower limit of the gas monitoring system.

[0030] The gas monitoring system of the present invention comprises a rapid detection gas circuit unit 103 and an ion mobility spectrometer module, and the rapid detection gas circuit unit 103 is fluidically connected to the ion mobility spectrometer module.

[0031] The gas monitoring system of the present invention further comprises a pre-concentration tube module, which is fluidically connected to the ion mobility spectrometer module.

[0032] The gas monitoring system of the present invention further comprises a gas circuit system control unit 104, which can control the operation mode of the gas monitoring system according to a preset program.

[0033] The gas monitoring system of the present invention is capable of operating in at least these two modes, including a real-time sampling monitoring mode and a concentrated sampling monitoring mode.

[0034] In one embodiment, the gas monitoring system includes a fast-test gas circuit unit 103, a pre-concentrator module, and an ion mobility spectrometer module. The ion mobility spectrometer module includes an ion mobility spectrometer 105, which is fluidically connected to the fast-test gas circuit unit 103 and the pre-concentrator module.

[0035] The gas monitoring system of the present invention is configured to switch between a real-time sampling monitoring mode and a concentrated sampling monitoring mode. In one embodiment, in the real-time sampling monitoring mode, the gas monitoring system is configured to introduce gas through a quick detection gas circuit unit, and introduce at least a portion of the gas into the ion mobility spectrometer 105 to detect whether the gas contains a target substance. For example, in the case where a certain concentration of a target substance is contained in the gas (such as the air at the inspection site), the gas is introduced by the quick detection gas circuit unit of the gas monitoring system, and the ion mobility spectrometer module detects in real time that the gas contains the target substance, thereby providing an alarm in real time and quickly. In the concentrated sampling monitoring mode, the gas monitoring system is configured to introduce the gas into the pre-concentration tube module to perform enrichment treatment on the gas in the pre-concentration tube module, and after the enrichment is completed, the enriched target substance is released through the analytical treatment and then introduced into the ion mobility spectrometer 105 to implement the detection of the target substance. The concentrated sampling monitoring mode can detect the target substance content at a lower concentration in the gas, thereby avoiding the possibility of missed detection in the real-time sampling monitoring mode.

[0036] According to the present invention, the gas monitoring system is configured to manually or automatically switch from the real-time sampling monitoring mode to the concentrated sampling monitoring mode when the real-time sampling mode does not detect the target substance contained in the gas within a set time.

[0037] According to the present invention, the gas monitoring system is configured to switch from the real-time sampling monitoring mode to the concentrated sampling monitoring mode when the real-time sampling monitoring mode does not detect the target substance in the gas. In the real-time sampling monitoring mode, the quick detection gas circuit unit continuously introduces gas and introduces at least part of the gas into the ion mobility spectrometer 105 to implement the detection of the target substance. However, if the ion mobility spectrometer 105 does not show the detection of the target substance within the set time, the gas monitoring system can be manually or automatically switched to the concentrated sampling monitoring mode. The set time can be 0.25h, 0.5h, 1h, etc.

[0038] The gas monitoring system of the present invention can be manually or automatically switched between the real-time sampling monitoring mode and the concentrated sampling monitoring mode, thereby realizing the function of real-time rapid detection, and at the same time ensuring that the target substance contained in the gas at an extremely low concentration can be detected. The present invention also has the advantage that no additional auxiliary devices or equipment are required, and when the real-time sampling monitoring mode cannot detect the target substance at an extremely low concentration, it can be switched to the concentrated sampling monitoring mode to accurately detect the target substance, and the operation is simple and convenient.

[0039] In one embodiment of the gas monitoring system, the gas monitoring system includes a quick-test gas circuit unit 103, the quick-test gas circuit unit 103 fluid is connected to a sampling gas circuit unit 108, and is fluidly connected to an ion mobility spectrometer 105 in a specific manner, a portion of the gas in the quick-test gas circuit unit 103 is sent to the ion mobility spectrometer 105 for detection, and the other portion is discharged through the sampling gas circuit unit 108.

[0040] In one embodiment, the gas monitoring system includes a water-blocking and breathable membrane assembly 109. The gas in the quick-test gas circuit unit 103 flows through the water-blocking and breathable membrane assembly 109, that is, the gas sweeps through the water-blocking and breathable membrane assembly 109. When the gas contains a target substance, the target substance will pass through the water-blocking and breathable membrane assembly 109 and enter the ion mobility spectrometer 105, thereby being detected by the ion mobility spectrometer 105. The rest of the gas flows into the downstream sampling gas circuit unit 108 and is discharged through the sampling gas circuit unit 108. For example, in one embodiment, the sampling gas circuit unit 108 includes an air pump. Under the action of the negative pressure of the air pump, the gas is drawn into the sampling gas circuit unit 108 and then discharged. The water-blocking and breathable membrane assembly 109 is configured to transfer the high-concentration target substance on the left side as shown in the figure to the right side, which is determined by the concentration of the target substance on the left side of the water-blocking and breathable membrane assembly 109 being higher than that on the right side. It should be understood that the water-blocking and breathable membrane assembly 109 is one implementation of the present invention. In other embodiments, a portion of the gas may be directly introduced into the ion mobility spectrometer 105, while the rest of the gas is exhausted. In other embodiments, the gas path may be designed in other ways, and only a portion of the gas needs to be introduced into the ion mobility spectrometer 105. The water-blocking and breathable membrane assembly 109 is also configured to remove water molecules from the gas.

[0041] In other embodiments of the present invention, other components may be provided to send a portion of the gas in the quick-test gas circuit unit 103 to the ion mobility spectrometer 105 for detection.

[0042] In one embodiment, the gas monitoring system includes a pre-concentrator module, the pre-concentrator module includes a pre-concentrator 102, the gas is introduced into the pre-concentrator 102, and the pre-concentrator 102 is configured to perform enrichment processing by adsorbing the target substance in the gas introduced into the pre-concentrator 102. For example, a porous material or other material for adsorbing the target substance can be set in the pre-concentrator 102, and this porous material or other material with adsorption function can adsorb the target substance in the gas when the gas flows through the porous material or other material with adsorption function within a certain temperature range (for example, near room temperature). When the temperature rises to a certain range, for example, reaching around 300 degrees, the adsorbed target substance is separated from the surface of the porous material or other material with adsorption function due to increased activity, which is generally referred to as desorption processing. Therefore, desorption processing can be performed by heating or temperature increase. The pre-concentrator module can desorb the target substance from the porous material in the pre-concentrator 102 by heating. After being desorbed, the target substance enters the gas in the pre-concentrator 102, and is then introduced into the ion mobility spectrometer 105 along the pipeline. In this embodiment, the gas monitoring system may include a water-blocking and breathable membrane assembly 109, and the gas flowing in from the pre-concentration tube 102 flows through the water-blocking and breathable membrane assembly 109; for example, the water-blocking and breathable membrane assembly 109 includes a water-blocking and breathable membrane and a chamber accommodating the water-blocking and breathable membrane. The gas flows through the water-blocking and breathable membrane assembly 109, that is, enters the chamber accommodating the water-blocking and breathable membrane. When the gas sweeps through the water-blocking and breathable membrane, when the gas contains enriched target substances, the target substances will permeate through the water-blocking and breathable membrane assembly 109 and enter the ion mobility spectrometer 105, thereby being detected by the ion mobility spectrometer 105, and the other part of the gas is blocked by the water-blocking and breathable membrane and flows into the downstream sampling gas path unit 108, and is discharged through the sampling gas path unit 108.

[0043] In one embodiment, the gas monitoring system further includes a three-way valve 110 and a gas circuit system control unit 104. The two inlet ends of the three-way valve 110 are connected to the pre-concentration tube 102 and the fast-test gas circuit unit 103, and the outlet end leads to the ion mobility spectrometer module and the sampling gas circuit unit 108. The gas circuit system control unit 104 is configured to introduce the gas from the fast-test gas circuit unit 103 into the ion mobility spectrometer module (ion mobility spectrometer 105) through the three-way valve 110 in the real-time sampling monitoring mode. That is, in the real-time sampling monitoring mode, the gas circuit system control unit 104 controls the three-way valve 110 so that in the pre-concentration tube 102, the fast-test gas circuit unit 103 and the sampling gas circuit unit 108 connected by the three-way valve 110, the flow path from the pre-concentration tube 102 to the ion mobility spectrometer 105 and the sampling gas circuit unit 108 is cut off, and the flow path from the fast-test gas circuit unit 103 to the ion mobility spectrometer 105 and the sampling gas circuit unit 108 is open. In this case, the target substance in the gas can be quickly detected by only taking in gas through the quick detection gas circuit unit 103. The gas circuit system control unit 104 can be configured to automatically switch the gas monitoring system from the real-time sampling monitoring mode to the concentrated sampling monitoring mode when the ion mobility spectrometer 105 detects that the content of the target substance is zero in the real-time sampling monitoring mode. In another embodiment, the pre-concentration tube 102 can provide an inlet valve, and in the real-time sampling monitoring mode, the inlet valve is closed and the gas cannot enter the pre-concentration tube 102.

[0044] In other embodiments, the three-way valve 110 may not be necessary, and the pre-concentrator tube 102 may be directly fluidically connected to the sampling gas circuit unit 108. In this embodiment, the pre-concentrator tube 102 is directly fluidically connected to the water-blocking and breathable membrane assembly 109 and the sampling gas circuit unit 108, and the target substance passes through the water-blocking and breathable membrane assembly 109 and enters the ion mobility spectrometer 105. In this embodiment, the quick-test gas circuit unit 103 is directly fluidically connected to the water-blocking and breathable membrane assembly 109 and the sampling gas circuit unit 108, and the target substance passes through the water-blocking and breathable membrane assembly 109 and enters the ion mobility spectrometer 105. In this embodiment, the pre-concentrator tube 102 and the quick-test gas circuit unit 103 may each be provided with an inlet control valve to control the air intake. In the present invention, the sampling gas path unit 108 is arranged downstream of the water-blocking and breathable membrane assembly 109, which can provide negative pressure by pumping gas to make the gas flow through the water-blocking and breathable membrane assembly 109, and the target substance in the gas permeates through the water-blocking and breathable membrane of the water-blocking and breathable membrane assembly 109, and then enters the ion mobility spectrometer 105, and the rest of the gas is pumped into the sampling gas path unit 108 and then discharged.

[0045] In an embodiment of the present invention, a three-way valve 110 is provided, and the three-way valve 110 connects the gas path from the quick-test gas path unit 103 to the sampling gas path unit 108, and the three-way valve 110 also connects the gas path from the pre-concentration tube 102 to the sampling gas path unit 108. The gas path system control unit 104 is configured to cut off the flow path from the quick-test gas path unit 103 to the sampling gas path unit 108 through the three-way valve 110 in the concentrated sampling monitoring mode, allowing the gas to pass through the pre-concentration tube 102, and then a part of the gas is introduced into the ion mobility spectrometer module after being enriched, and the rest of the gas flows into the sampling gas path unit 108. That is, at this time, the gas containing the target substance (of course, it may not contain the target substance, which is unknown before detection) passes through the pre-concentration tube 102, that is, flows through the porous material or other materials with adsorption functions therein, the target substance is adsorbed, and the gas continues to flow through, and enters the sampling gas path unit 108, and is discharged. After a predetermined time, such as two minutes, or 15 to 20 minutes, such as twenty minutes, the porous material or other material with adsorption function adsorbs a predetermined amount of the target substance (i.e., enrichment). At this time, the pre-concentration tube 102 is heated and the collected enriched target substance is analyzed, and flows through, for example, the water-blocking and breathable membrane component 109 (such as the above-mentioned gas sweeping one side of the water-blocking and breathable membrane) with the gas, and the target substance permeates through the water-blocking and breathable membrane component 109 (the water-blocking and breathable membrane) and enters the ion mobility spectrometer 105. For example, as schematically shown in the figure, the target substance enters the chamber included in the water-blocking and breathable membrane component 109 (the water-blocking and breathable membrane component 109 includes the chamber and the water-blocking and breathable membrane in the chamber), sweeps the left side of the water-blocking and breathable membrane, and due to the concentration difference, the target substance permeates through the water-blocking and breathable membrane to its right side and enters the ion mobility spectrometer 105, and the rest of the gas flows into the sampling gas path unit 108 and is discharged.

[0046] In an embodiment of the present invention, the pre-concentrator module includes a temperature control unit 101, which is configured to control the pre-concentrator 102 to be at a first predetermined temperature when performing enrichment processing, and to control the pre-concentrator 102 to be at a second predetermined temperature during analysis, and the second predetermined temperature is higher than the first predetermined temperature.

[0047] The temperature control unit 101 of the pre-concentrator tube module may include a heating wire (not shown). For example, the heating wire can increase the temperature of the porous material or other materials with adsorption functions. The way the temperature control unit 101 is shown in the figure does not limit the position and configuration of the temperature control unit 101, but only indicates that the temperature control unit 101 is provided in the gas monitoring system.

[0048] For example, in one embodiment, the pre-concentrator module can be in the form of a pre-concentrator 102 and a temperature control unit 101 integrated, that is, the pre-concentrator 102 contains a porous material or other material with an adsorption function, and realizes the process of heating and cooling the porous material or other material with an adsorption function. For example, the pre-concentrator 102 can have a heat sink or other components for realizing rapid cooling in addition to a heating wire with a heating function. The heating and cooling related components of the pre-concentrator 102 are not described in detail here, and those skilled in the art can use the heating and cooling methods and devices commonly used in the art.

[0049] The pre-concentrator tube 102 may be in fluid communication with a water-blocking, gas-permeable membrane assembly 109, which allows a portion of the gas (e.g., a target substance) from the pre-concentrator tube 102 to be introduced into the ion mobility spectrometer 105. In the present invention, the water-blocking, gas-permeable membrane assembly 109 is not necessary, and the gas enriched with the target substance may be directly partially introduced into the ion mobility spectrometer 105. In one embodiment, in the real-time sampling and monitoring mode, the pre-concentrator tube 102 is disconnected from the ion mobility spectrometer 105 and is only in fluid communication with the ion mobility spectrometer in the concentrated sampling and monitoring mode.

[0050] According to the gas monitoring system of the present invention, the ion mobility spectrometer module includes an ion mobility spectrometer 105 and an internal circulation cleaning module 107. The ion mobility spectrometer 105 may have components such as an ionization source, an ion gate, and a Faraday cup. The left end of the ion mobility spectrometer 105 shown in the figure schematically shows the ionization source. The target substance contained in the gas is ionized by the ionization source to generate ions. The ions are accelerated or blocked at the ion gate. A Faraday cup is provided at the right end of the ion mobility spectrometer 105 for ion detection. The ion mobility spectrometer module is configured to be in operation in both the real-time sampling monitoring mode and the concentrated sampling monitoring mode so as to detect the content of the target substance at any time. The gas in the ion mobility spectrometer module flows out from the outlet at the middle section of the ion mobility spectrometer 105, enters the internal circulation cleaning module 107 for cleaning, and then flows into the ion mobility spectrometer 105 from the inlets at both ends of the ion mobility spectrometer 105 (which can be used as a migration gas) to realize the internal circulation.

[0051] A circulation pump (not shown) may be provided in the ion mobility spectrometer module, and driven by the circulation pump, the gas in the flow path in the ion mobility spectrometer module is circulated. In the gas monitoring system shown in the figure, the gas enters the ion mobility spectrometer 105 from the inlet end at the left end of the ion mobility spectrometer 105, and the target substance in the gas moves and is detected in the ion mobility spectrometer 105. The target substance or other impurities are removed in the inner circulation cleaning module 107, and the cleaned gas is discharged, a part of the cleaned gas is sent to the inlet end at the left end of the ion mobility spectrometer 105, and a part of the cleaned gas is sent to the inlet end at the right end of the ion mobility spectrometer 105 as a migration gas. The inner circulation cleaning module 107 can also be used as a buffer component.

[0052] The ion mobility spectrometer module can maintain internal circulation during the operation of the gas monitoring system.

[0053] The gas monitoring system of the present invention further includes an alarm information output unit 106, which is configured to output information of the target substance contained in the gas when the ion mobility spectrometer 105 detects the target substance. For example, the alarm information output unit 106 may include a display screen for displaying the element, composition and / or content of the measured target substance. The alarm information output unit 106 may also include an alarm that outputs a sound to indicate that, for example, the air in the surrounding environment contains harmful substances.

[0054] The multiple embodiments of the present invention can be combined in any way according to the ideas and principles disclosed in this aspect, and the implemented technical solutions are all included in the embodiments of the present invention.

[0055] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality; "upper", "lower", "bottom", "upper part", "lower part" are only used to indicate the orientation of the components in the illustrated structure, rather than to limit their absolute orientation; "first" and "second" are used to distinguish the names of different components rather than to sort or indicate importance or primary and secondary distinction. In addition, any element number in the claims should not be understood as limiting the scope of the present disclosure.

[0056] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas monitoring system, comprising: Quick inspection gas circuit unit; Pre-concentrator tube module; as well as An ion mobility spectrometer module, comprising an ion mobility spectrometer, wherein the ion mobility spectrometer is in fluid communication with a fast-test gas circuit unit and in fluid communication with the pre-concentration tube module; The gas monitoring system is configured to switch between a real-time sampling monitoring mode and a concentrated sampling monitoring mode: In the real-time sampling monitoring mode, the gas monitoring system is configured to introduce gas through the quick-test gas circuit unit and detect whether the gas contains the target substance through the ion mobility spectrometer module; and In the concentrated sampling monitoring mode, the gas monitoring system is configured to introduce gas into the pre-concentration tube module to perform enrichment processing on the gas, and after the enrichment is completed, release the enriched target substance through analysis processing and implement detection of the target substance through the ion mobility spectrometer.

2. The gas monitoring system according to claim 1, wherein the gas monitoring system is configured to switch from the real-time sampling monitoring mode to the concentrated sampling monitoring mode based on failure to detect the target substance contained in the gas in the real-time sampling monitoring mode.

3. The gas monitoring system according to claim 1, wherein the quick-test gas circuit unit fluid is connected to the sampling gas circuit unit, and the portion of the quick-test gas circuit unit that does not enter the ion mobility spectrometer enters the sampling gas circuit unit and is discharged through the sampling gas circuit unit.

4. The gas monitoring system according to claim 1, wherein the pre-concentration tube module includes a pre-concentration tube, which is configured to perform an enrichment process on the target substance introduced into the gas in the pre-concentration tube by adsorption, and perform the desorption process by heating to desorb the target substance into the gas in the pre-concentration tube, and then provide the gas containing the target substance to the ion mobility spectrometer.

5. The gas monitoring system according to claim 4, further comprising: A three-way valve, wherein the inlet end of the three-way valve is connected to the pre-concentration tube and the quick-test gas circuit unit, and the outlet end of the three-way valve is connected to the sampling gas circuit unit; and The gas circuit system control unit is configured to allow the gas from the quick test gas circuit unit to flow to the ion mobility spectrometer through the three-way valve in the real-time sampling monitoring mode, so that part of the gas is introduced into the ion mobility spectrometer and the other part flows into the sampling gas circuit unit.

6. A gas monitoring system according to claim 5, wherein the gas path system control unit is configured to cut off the flow path from the quick-test gas path unit to the ion mobility spectrometer through the three-way valve in a concentrated sampling monitoring mode, allowing the gas passing through the pre-concentration tube to flow to the ion mobility spectrometer, so that a portion of the gas is introduced into the ion mobility spectrometer and the rest flows into the sampling gas path unit.

7. The gas monitoring system according to claim 4, wherein the pre-concentrator module comprises a temperature control unit, configured to control the pre-concentrator to be at a first predetermined temperature when performing an enrichment process, and to control the pre-concentrator to be at a second predetermined temperature during analysis, wherein the second predetermined temperature is higher than the first predetermined temperature.

8. A gas monitoring system according to claim 1, wherein the ion mobility spectrometer module is configured such that in the real-time sampling monitoring mode and the concentrated sampling monitoring mode, the gas in the ion mobility spectrometer module flows out of the ion mobility spectrometer, enters an internal circulation cleaning module of the ion mobility spectrometer module for cleaning, and then the cleaned gas flows into the ion mobility spectrometer. 9 . The gas monitoring system according to claim 1 , further comprising an alarm information output unit configured to output information of the target substance when the ion mobility spectrometer module detects the target substance.

10. The gas monitoring system according to claim 1 further includes a water-blocking and breathable membrane assembly, which is arranged in the gas path leading to the ion mobility spectrometer, so that the target substance in the gas from the rapid detection gas path unit and / or the pre-concentration tube can be introduced into the ion mobility spectrometer by permeation. 11 . The gas monitoring system according to claim 10 , wherein the water-blocking and gas-permeable membrane assembly is further configured to remove water molecules from the gas.

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