Enhanced microwave plasma-bent quadrupole time-of-flight mass spectrometer and underway monitoring system

Abstract

The utility model provides an enhanced microwave plasma-bent quadrupole rod time-of-flight mass spectrometer and an underway monitoring system. The enhanced microwave plasma-bent quadrupole rod time-of-flight mass spectrometer is composed of an enhanced microwave plasma ionization source, a bent quadrupole rod system, a time-of-flight mass analyzer and a vacuum system. The enhanced microwave plasma ionization source ionizes a sample, and the sample enters the time-of-flight mass analyzer after being preliminarily screened and focused by the bent quadrupole rod system, so that the analysis and detection of the sample are completed. The device can reduce interference of photons and neutral molecules, improves ionization efficiency and detection sensitivity of detection substances, is reasonable in design, compact in structure and convenient to install and operate, realizes high-sensitivity online detection of atmospheric pollutants, can be carried on a mobile platform, and is used for underway monitoring of gaseous pollutants in an atmospheric environment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mass spectrometer technical field, concretely relates to a kind of enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer and underway monitoring system. BACKGROUND

[0002] The current detection method of gaseous pollutants in atmosphere, such as gas chromatography-mass spectrometry (GC-MS), has some obvious shortcomings, including the need for sample pretreatment, slow detection speed and low detection sensitivity. These shortcomings limit the efficiency and accuracy of traditional detection methods in practical applications. SUMMARY

[0003] To overcome the defects in the prior art, the utility model provides an enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer, which realizes high-sensitivity and rapid online monitoring of gaseous pollutants in the atmosphere. It also provides an underway monitoring system based on the above-mentioned enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer, which is used for underway monitoring of gaseous pollutants in the atmospheric environment.

[0004] The first purpose of the utility model can be achieved by the following technical solutions: an enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer, comprising an enhanced microwave plasma ionization source, a bending quadrupole rod system, a time-of-flight mass analyzer, and a vacuum system. The input end of the bending quadrupole rod system is connected to the output end of the enhanced microwave plasma ionization source. The output end of the bending quadrupole rod system is connected to the input end of the time-of-flight mass analyzer. The bending quadrupole rod system is used to preliminarily screen the ions output by the enhanced microwave plasma ionization source and then deliver them to the time-of-flight mass analyzer. The time-of-flight mass analyzer is used to separate and screen different ions, thereby capturing target ions and converting them into corresponding electrical signals. The vacuum system includes a first molecular pump, a second molecular pump, and a dry pump. The first molecular pump is arranged around the bending quadrupole rod system to reduce the vacuum degree in the bending quadrupole rod system area. The second molecular pump is arranged around the time-of-flight mass analyzer to reduce the vacuum degree in the time-of-flight mass analyzer area. The dry pump, the first molecular pump, and the second molecular pump are all in communication to reduce the vacuum degree from atmospheric pressure to a range where the molecular pump can effectively work.

[0005] Preferably, the enhanced microwave plasma ionization source comprises an inner tube, a middle tube, an outer tube, a microwave input tube, a capacitive coupling ring, an enhanced electrode, a repelling electrode group, a sample injection tube, and a first transmission focusing electrode group; the inner tube is located at the center of the middle tube, the middle tube is located at the center of the outer tube, the microwave input tube is located at the rear end of the outer tube, the capacitive coupling ring is installed at the rear end of the middle tube and connected with the microwave input tube, the enhanced electrode is located at the end of the outer tube, the repelling electrode group is located at the rear end of the enhanced electrode, the sample injection tube is located between the electrodes of the repelling electrode group, the first transmission focusing electrode group is located at the rear end of the repelling electrode group, and the rear end of the first transmission focusing electrode group is connected with the input end of the curved quadrupole rod system.

[0006] Preferably, a first sealing ring is arranged between the inner tube and the middle tube, which is used to isolate the environment between the inner tube and the middle tube from the atmosphere and fix the inner tube. The material of the first sealing ring is fluororubber or other materials.

[0007] Preferably, a second sealing ring is arranged between the microwave input tube and the outer tube, which is used to isolate the environment in the enhanced microwave plasma ionization source from the atmosphere. The material of the second sealing ring is fluororubber or other materials.

[0008] Preferably, the outer diameter of the inner tube is 3 mm, and the inner diameter is 2 mm; the outer diameter of the middle tube is 6 mm, and the inner diameter is 5 mm; the ratio of the inner diameter of the outer tube to the outer diameter of the middle tube is between 2.3 and 2.6; the impedance of the outer tube is 50 ohms, and the outer tube is integrated with a tuning piston.

[0009] Preferably, the thickness of the electrode sheet of the enhanced electrode is 3 mm, and the thickness of the electrode sheet of the repelling electrode group is 4 mm.

[0010] Preferably, the curved quadrupole rod system comprises a curved quadrupole rod and a second transmission focusing electrode group; the curved quadrupole rod is a metal tubular structure bent into an L shape, and the second transmission focusing electrode group is located at the rear end of the curved quadrupole rod, which is used to focus and transmit the ions preliminarily screened by the curved quadrupole rod into the time-of-flight mass analyzer.

[0011] Preferably, the curvature of the curved quadrupole rod at the bending part is 90°, the diameter of the curved quadrupole rod is 6 mm, and the ratio of the diameter to the diameter of the inscribed circle is 1:1.15.

[0012] Preferably, the time-of-flight mass analyzer comprises an acceleration electrode group, a field-free flight region, a reflection electrode group, and a detector; the acceleration electrode group is arranged at the front end of the time-of-flight mass analyzer, which is used to accelerate the ions to the same speed; the field-free flight region is located between the acceleration electrode group and the reflection electrode group; the detector is located at the end of the time-of-flight mass analyzer, which is used to convert the captured ions into an electrical signal and amplify the signal.

[0013] Preferably, the electrode sheet thickness of the reflective electrode set is 1.6mm.

[0014] The second purpose of the utility model is to provide a kind of based on above-mentioned enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer's underway monitoring system, including mobile platform, the mobile platform is equipped with above-mentioned enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer and negative pressure gas collecting device, the negative pressure gas collecting device with the sample tube of the described enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer is connected.By mobile platform realizes underway monitoring, solve the problem that prior art cannot be directly analyzed and detected in field.Mobile platform can be vehicle, unmanned aerial vehicle and other vehicles or mobile carrier.

[0015] Compared with prior art, the utility model has the beneficial effects as follows:

[0016] (1) compared with traditional microwave plasma ion source, enhanced microwave plasma ion source can work at lower gas pressure, reduce the requirement for vacuum degree, and working gas pressure is 0.1mbar-10mbar.Formation of helium plasma is easier in low gas pressure environment, and ionization energy and efficiency are also higher under the same power.

[0017] (2) bending quadrupole rod is combined with time-of-flight mass analyzer efficiently, effectively reduces the interference of photon and neutral molecule, improves the sensitivity and resolution of mass spectrometer, and the stability and reliability of result are also higher.Meanwhile, bending quadrupole rod is used to replace traditional quadrupole rod, effectively reduces the volume of mass spectrometer.

[0018] (3) enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer detects fast, without complex pretreatment to sample, suitable for detecting large batch of samples, and can be used for online detection.

[0019] (4) enhanced microwave plasma ion source has simple structure, and working parameters are easy to control and adjust.Mass spectrometer has high integration degree, is convenient to operate and maintain, can be placed on mobile platform, and carries out underway monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer structure schematic diagram is provided for example one.

[0021] Figure 2 The mass spectrum information of using enhanced microwave plasma-bending quadrupole rod time-of-flight mass spectrometer in example one to detect benzene (m / z=78) is provided.

[0022] Figure 3Standard curve for the detection of benzene (m / z = 78) using the enhanced microwave plasma - curved quadrupole rod time-of-flight mass spectrometer of Example 1.

[0023] In the figure: I, enhanced microwave plasma ionization source; II, curved quadrupole rod system; III, time-of-flight mass analyzer; IV, vacuum system; 1, inner tube; 2, first sealing ring; 3, middle tube; 4, outer tube; 5, second sealing ring; 6, microwave input tube; 7, capacitively coupled ring; 8, enhancement electrode; 9, repelling electrode set; 10, sample inlet tube; 11, first transmission focusing electrode set; 12, curved quadrupole rod; 13, second transmission focusing electrode set; 14, acceleration electrode set; 15, field-free flight region; 16, reflecting electrode set; 17, detector; 18, first molecular pump; 19, second molecular pump; 20, dry pump; 21, ionized ions; 22, microwave plasma. DETAILED DESCRIPTION

[0024] The utility model will be explained in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for the person skilled in the art, on the premise of not departing from the utility model concept, a number of changes and improvements can be made. These all belong to the protection scope of the utility model.

[0025] In addition, it should be pointed out that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the sentence "including a" does not exclude the existence of other identical elements in the process, method, article or equipment including the element. And, the front end and the rear end referred to in the paper refer to the front and rear order according to the actual ion movement path, which is hereby stated.

[0026] Example 1:

[0027] Reference Figure 1 The utility model provides a kind of enhanced microwave plasma - curved quadrupole rod time-of-flight mass spectrometer of the enhanced microwave plasma ionization source I, curved quadrupole rod system II, time-of-flight mass analyzer III and vacuum system IV are formed by.

[0028] The enhanced microwave plasma ionization source I includes an inner tube 1, a first sealing ring 2, a middle tube 3, an outer tube 4, a second sealing ring 5, a microwave input tube 6, a capacitive coupling ring 7, an enhanced electrode 8, a repelling electrode group 9, a sample inlet tube 10, and a first transmission focusing electrode group 11. The inner tube 1 is located at the center of the middle tube 3, with an outer diameter of 3 mm and an inner diameter of 2 mm. The first sealing ring 2 is located between the inner tube 1 and the middle tube 3, used to isolate the environment between the inner tube 1 and the middle tube 3 from the atmosphere, and to fix the inner tube. The middle tube 3 is located at the center of the outer tube 4, with an outer diameter of 6 mm and an inner diameter of 5 mm. The inner diameter of the outer tube 4 is about 26 mm, and the ratio of the inner diameter size to the outer diameter size of the middle tube 3 is between 2.3-2.6. The impedance of the outer tube 4 is standard 50 ohms, and the outer tube 4 has integrated a tuning piston, which can function as a tuning piston to ensure that the maximum electric field strength is reached at the port of the middle tube 3. The second sealing ring 5 is located between the outer tube 4 and the microwave input tube 6, used to isolate the environment inside the enhanced microwave plasma ionization source from the atmosphere. The microwave input tube 6 is located at the rear end of the outer tube 4, used to introduce microwave energy. The capacitive coupling ring 7 is installed at the rear end of the middle tube 3 and connected to the microwave input tube 6, so that the microwave enters the tube in a capacitive coupling manner through the capacitive coupling ring. The microwave propagates along the tube from the coupling ring to the tuning piston of the outer tube 4, is reflected after encountering the metal tuning piston, reaches the maximum electric field strength at the port of the middle tube 3, and excites the microwave plasma 22. The microwave plasma 22 shown in the figure is located at the rear end of the inner tube, which is a stable microwave plasma. The enhanced electrode 8 is located at the end of the outer tube 4, with an electrode sheet thickness of 3 mm, used to enhance the microwave plasma. The repelling electrode group 9 is located at the rear end of the enhanced electrode 8, used to accelerate the charged ions. The sample inlet tube 10 is located between the electrodes of the repelling electrode group 9, used to input the gas sample into the ionization region of the enhanced microwave plasma ionization source. As shown in the figure, when the ionized ions 21 are located around the microwave plasma 22, it represents that the sample has been successfully ionized after entering the enhanced microwave plasma ionization source through the sample inlet tube 10. The first transmission focusing electrode group 11 is located at the rear end of the repelling electrode group 9, used to focus and transmit the charged ions into the curved quadrupole rod system II.

[0029] The enhanced electrode 8 is made of metal materials such as stainless steel, with an electrode sheet thickness of 3 mm, used to enhance the microwave plasma 22, which can enhance the ionization efficiency under the same power. The repelling electrode group 9 is made of metal materials such as stainless steel, with an electrode sheet thickness of 4 mm, used to give the ions a certain initial speed to smoothly enter the subsequent device. The sample inlet tube 10 is made of metal materials such as stainless steel, used to input the gas sample into the ionization region of the enhanced microwave plasma ionization source. The first transmission focusing electrode group 11 is made of metal materials such as copper and stainless steel, used to focus and transmit the charged ions into the curved quadrupole rod system II.

[0030] The bending quadrupole system II includes a bending quadrupole 12 and a second transmission focusing electrode group 13. The bending quadrupole 12 is located behind the enhanced microwave plasma ionization source, adopts an L-shaped tubular structure supported by a metal material such as molybdenum and stainless steel, has a diameter of 6 mm, a ratio of diameter to inscribed circle diameter of 1:1.15, and a bending degree of 90°, and is used for preliminarily screening ions, removing the interference of photons and neutral molecules, and improving the sensitivity of detection. The second transmission focusing electrode group 13 is located at the rear end of the bending quadrupole 12, and is used for focusing and transmitting the ions preliminarily screened by the bending quadrupole 12 into the time-of-flight mass analyzer. The second transmission focusing electrode group 13 is made of a metal material such as copper and stainless steel, and is used for focusing and transmitting the ions preliminarily screened by the bending quadrupole 12 into the time-of-flight mass analyzer.

[0031] The time-of-flight mass analyzer III is a reflection type time-of-flight mass analyzer, and includes an acceleration electrode group 14, a field-free flight region 15, a reflection electrode group 16, and a detector 17. The acceleration electrode group 14 is located at the front end of the time-of-flight mass analyzer, is made of a metal material such as copper and stainless steel, and is used for accelerating ions to the same speed. The field-free flight region 15 is located between the acceleration electrode group 14 and the reflection electrode group 16. Since the mass-to-charge ratios of different ions are different, the flight times of different ions are different, and the ions with different mass-to-charge ratios are separated. The reflection electrode group 16 is located at the middle end of the time-of-flight mass analyzer, is made of a metal material such as copper and stainless steel, has an electrode sheet thickness of 1.6 mm, and is used for increasing the effective flight distance of ions, thereby improving the resolution of the instrument. The detector 17 is located at the end of the time-of-flight mass analyzer, i.e., below the acceleration electrode 14 in the figure, and is used for converting the captured ions into an electrical signal and amplifying the signal.

[0032] The vacuum system IV includes a first molecular pump 18, a second molecular pump 19, and a dry pump 20. The first molecular pump 18 is arranged around the bending quadrupole 12, and is used for further reducing the vacuum degree of the bending quadrupole 12 region to reach the vacuum degree required for normal operation of the bending quadrupole 12. The second molecular pump 19 is arranged around the time-of-flight mass analyzer, and is used for further reducing the vacuum degree of the time-of-flight mass analyzer region to reach the vacuum degree required for normal operation of the time-of-flight mass analyzer. The dry pump 20 is connected to the first molecular pump 18 and the second molecular pump 19, respectively, and is used for reducing the vacuum degree from atmospheric pressure to a vacuum range in which the two molecular pumps can effectively work. It should be noted that the first molecular pump 18 and the second molecular pump 19 can be a turbo molecular pump or other types of molecular pumps, and the dry pump can be a screw type dry pump or other types of dry pumps.

[0033] The following is the use principle of the enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer in the embodiment:

[0034] As Figure 2 ,Figure 3 As shown, according to the following steps, the molecular ion peak ionization of the sample is completed, taking toluene (relative molecular mass 92) sample as an example:

[0035] 1. Helium is introduced through the inner tube 1 and the middle tube 3, and the gas flow is adjusted according to the needs. The sample is input into the enhanced microwave plasma ionization source I through the sample inlet tube 10.

[0036] 2. A microwave input tube 6 is connected to a microwave energy of a certain frequency (such as 2.45 GHz), and the microwave energy is directly coupled into the tube through a capacitive coupling ring 7 in a capacitive coupling manner. After that, the transmission direction from the capacitive coupling ring 12 to the tuning piston on the outer tube 4 in the tube, the transmitted microwave is reflected after encountering the tuning piston, and is superimposed with the incident wave, forming a maximum electric field at the end face of the middle tube 3. Under the action of microwave energy and enhanced electrode 8, an enhanced microwave plasma 22 is excited, and the working pressure of the enhanced microwave plasma 22 is 0.01 mbar to 100 mbar. The sample molecules are ionized under the action of the enhanced microwave plasma 22, and a large number of sample ions are generated.

[0037] 3. The sample ions pass through the repelling electrode group 9 and the first transmission focusing electrode group 11, enter the curved quadrupole rod system II, and after preliminary screening in the curved quadrupole rod 12, the sample ions enter the time-of-flight mass analyzer III under the action of the second transmission focusing electrode group 13.

[0038] 4. The sample ions obtain a certain speed in the accelerating electrode group 14, enter the field-free flight area 15, and then change under the action of the reflecting electrode group 16, and finally the sample ions reach the detector 17. The obtained mass spectrum is as shown in Figure 3 .

[0039] Example 2

[0040] Based on the device provided in Example 1, the present embodiment provides a sailing monitoring system, which comprises a mobile device, wherein the mobile device is provided with the above-mentioned enhanced microwave plasma-curved quadrupole rod time-of-flight mass spectrometer and a negative pressure gas collecting device. The gas inlet of the negative pressure gas collecting device is connected with the outside for inhaling ambient air, and the negative pressure gas collecting device is connected with the sample inlet tube 10 of the enhanced microwave plasma-curved quadrupole rod time-of-flight mass spectrometer. The sailing monitoring is realized through the mobile platform, solving the problem that the prior art cannot be directly analyzed and detected on site. The mobile device can be a vehicle, a drone or other transportation tools or mobile carriers.

[0041] The embodiment adopts a vehicle as a mobile platform, fixes a negative pressure air collection device and an enhanced microwave plasma-bent quadrupole time-of-flight mass spectrometer in a trunk of the vehicle, places an air inlet pipe of the negative pressure air collection device on a roof of the vehicle through the roof, uses the negative pressure air collection device to suck air into the enhanced microwave plasma-bent quadrupole time-of-flight mass spectrometer, and performs real-time and on-site sampling detection and analysis.

[0042] The utility model discloses a combination of enhanced microwave plasma ionization source I and bent quadrupole system II and time-of-flight mass analyzer III, which can perform high-sensitivity rapid online detection on gaseous pollutants in the atmosphere without pretreatment. The mass spectrometer can also be carried on a mobile platform to perform underway monitoring on gaseous pollutants in the atmospheric environment, and is flexible to use, practical and applicable.

[0043] The specific embodiments of the utility model are described above. It should be understood that the utility model is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the utility model. The embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

Claims

1. An enhanced microwave plasma-bent quadrupole time-of-flight mass spectrometer, comprising an enhanced microwave plasma ionization source (I), a bent quadrupole system (II), a time-of-flight mass analyzer (III), and a vacuum system (IV); the input end of the bent quadrupole system (II) is connected to the output end of the enhanced microwave plasma ionization source (I), the output end of the bent quadrupole system (II) is connected to the input end of the time-of-flight mass analyzer (III), the bent quadrupole system (II) is used to preliminarily screen the ions output by the enhanced microwave plasma ionization source (I) and then deliver the ions to the time-of-flight mass analyzer (III); the time-of-flight mass analyzer (III) is used to separate and screen different ions, thereby capturing target ions and converting the target ions into corresponding electrical signals; the vacuum system (IV) comprises a first molecular pump (18), a second molecular pump (19), and a dry pump (20), the first molecular pump (18) is arranged around the bent quadrupole system (II) and is used to reduce the vacuum degree of the bent quadrupole system (II) region, the second molecular pump (19) is arranged around the time-of-flight mass analyzer (III) and is used to reduce the vacuum degree of the time-of-flight mass analyzer region, and the dry pump (20) is in communication with the first molecular pump (18) and the second molecular pump (19) and is used to reduce the vacuum degree from atmospheric pressure to a range in which the molecular pumps can effectively work.

2. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer of claim 1, wherein, The enhanced microwave plasma ionization source (I) comprises an inner tube (1), a middle tube (3), an outer tube (4), a microwave input tube (6), a capacitive coupling ring (7), an enhanced electrode (8), a repelling electrode group (9), a sample injection tube (10), and a first transmission focusing electrode group (11); the inner tube (1) is located at the center of the middle tube (3), the middle tube (3) is located at the center of the outer tube (4), the microwave input tube (6) is located at the rear end of the outer tube (4), the capacitive coupling ring (7) is mounted at the rear end of the middle tube (3) and is connected to the microwave input tube (6), the enhanced electrode (8) is located at the end of the outer tube (4), the repelling electrode group (9) is located at the rear end of the enhanced electrode (8), the sample injection tube (10) is located between the electrodes of the repelling electrode group (9), the first transmission focusing electrode group (11) is located at the rear end of the repelling electrode group (9), and the rear end of the first transmission focusing electrode group (11) is connected to the input end of the bent quadrupole system (II).

3. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer of claim 2, wherein, A first sealing ring (2) is arranged between the inner tube (1) and the middle tube (3), the first sealing ring (2) is used to isolate the environment between the inner tube (1) and the middle tube (3) from the atmosphere and fix the inner tube (1); a second sealing ring (5) is arranged between the microwave input tube (6) and the outer tube (4), and is used to isolate the environment in the enhanced microwave plasma ionization source (I) from the atmosphere.

4. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer according to claim 2 or 3, characterized in that The inner tube (1) has an outer diameter of 3 mm and an inner diameter of 2 mm; the middle tube (3) has an outer diameter of 6 mm and an inner diameter of 5 mm; the ratio of the inner diameter of the outer tube (4) to the outer diameter of the middle tube (3) is between 2.3 and 2.6; the impedance of the outer tube (4) is 50 ohms; and the outer tube (4) is integrated with a tuning piston.

5. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer of claim 2 or 3, wherein, The electrode sheet thickness of the enhanced electrode (8) is 3 mm, and the electrode sheet thickness of the repulsion electrode group (9) is 4 mm.

6. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer according to claim 1 or 2 or 3, characterized in that, The curved quadrupole rod system (II) comprises a curved quadrupole rod (12) and a second transmission focusing electrode group (13); the curved quadrupole rod (12) is an L-shaped metal tubular structure, and the second transmission focusing electrode group (13) is located at the rear end of the curved quadrupole rod (12) and is used for focusing and transmitting ions that have been preliminarily screened by the curved quadrupole rod (12) into a time-of-flight mass analyzer (III).

7. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer of claim 6, wherein, The curvature of the curved quadrupole rod (12) at the bending part is 90°, and the diameter of the curved quadrupole rod (12) is 6 mm, and the ratio of the diameter to the diameter of the inscribed circle is 1:1.

15.

8. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer according to claim 1 or 2 or 3, characterized in that, The time-of-flight mass analyzer (III) comprises an acceleration electrode group (14), a field-free flight region (15), a reflection electrode group (16), and a detector (17); the acceleration electrode group (14) is arranged at the front end of the time-of-flight mass analyzer (III) and is used for accelerating ions to the same speed; the field-free flight region (15) is located between the acceleration electrode group (14) and the reflection electrode group (16); and the detector (17) is located at the end of the time-of-flight mass analyzer (III) and is used for converting captured ions into an electrical signal and amplifying the signal.

9. The enhanced microwave plasma-bending quadrupole time-of-flight mass spectrometer of claim 8, wherein, The electrode sheet thickness of the reflection electrode group (16) is 1.6 mm.

10. A underway monitoring system, comprising: The mobile device is provided with the enhanced microwave plasma-curved quadrupole rod time-of-flight mass spectrometer and the negative pressure gas collecting device according to any one of claims 1-9, the gas inlet of the negative pressure gas collecting device is connected with the outside for inhaling ambient air, and the negative pressure gas collecting device is connected with the sample inlet tube (10) of the enhanced microwave plasma-curved quadrupole rod time-of-flight mass spectrometer.

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