Dielectric barrier discharge electrode structure, bipolar time division multiplexing dielectric barrier discharge ionization source and migration tube detection system

Abstract

The invention discloses a dielectric barrier discharge electrode structure, a bipolar time division multiplexing dielectric barrier discharge ionization source and a migration tube detection system. The dielectric barrier discharge electrode structure is arranged in the ionization source, the electrode structure comprises an insulating tube, a first metal electrode and a second metal electrode, the first metal electrode is located in the insulating tube, and the second metal electrode is located outside the insulating tube; the ionization source is arranged in the migration tube and comprises a high-voltage pulse generation system, a repulsion electrode and a pull-out electrode, the repulsion electrode and the pull-out electrode are arranged in the migration tube, a positive ion electrode structure and a negative ion electrode structure are arranged in an ionization area formed between the repulsion electrode and the pull-out electrode, the positive ion electrode structure generates positive ions during time division multiplexing, and the negative ion electrode structure generates negative ions during time division multiplexing. The negative ion electrode structure generates negative ions, and the direction of a repulsion electric field between the repulsion electrode and the pull-out electrode is switched through a corresponding high-voltage pulse generation system. According to the invention, the technical problems of large volume and high cost of a switching discharge electrode of a single migration tube and a double migration tube in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of ion mobility spectrometry, and in particular to a dielectric barrier discharge electrode structure, a bipolar time-division multiplexed dielectric barrier discharge ionization source and a migration tube detection system. Background Art

[0002] Ion Mobility Spectrometry (IMS) is a technique that works under atmospheric pressure and uses the flight time characteristics of ionized sample gas in an electric field to analyze gas components. To achieve ionization of the sample gas, a high-voltage pulse is required between metal electrodes. The strong electric field between the electrodes will accelerate the electrons and ions in the air near the electrodes and collide with neutral molecules and atoms such as oxygen and nitrogen. When the electron energy reaches a certain level, the electrons will ionize neutral particles and release new electrons. The new electrons will continue to collide and ionize neutral particles until an electron avalanche occurs and breaks through the air, ultimately achieving ionization of the sample. At the same time, dielectric barrier discharge (DBD) can solve the corrosion problem caused by discharge of electrodes in conditions containing water and oxygen, greatly improving the life of metal electrodes.

[0003] In the existing DBD ionization source, due to the blocking of ions by the dielectric layer, the number of positive ions and negative ions that can be effectively utilized will differ by about 10 times. When applied to IMS, in order to detect positively and negatively charged ionized samples at the same time, two migration tubes will be used, one with a positive electric field and the other with a negative electric field; or a single migration tube solution will be used, using high-voltage semiconductor devices to switch the discharge electrode and migration tube electrical polarity. Since the migration tube is the core component of the IMS detection device and occupies most of the manufacturing cost, the dual migration tube solution has the disadvantages of high cost and large size. In the single migration tube solution, the high voltage of the discharge electrode is much higher than the high voltage of the positive and negative electrodes of the migration tube, so the volume of the high-voltage semiconductor that switches the discharge electrode will be very large.

[0004] The energy generated by the existing ionization source discharge based on the corona discharge principle will cause the local temperature of the electrode to increase. After long-term operation, the chemical reactions caused by water vapor, oxygen, etc. in the gas will cause the electrode to oxidize, affecting the discharge efficiency and stability. At the same time, the electrode life will also be greatly reduced. Most companies in the industry use precious metals such as gold, platinum, and iridium as electrodes or design multiple identical electrode structures to extend the service life, resulting in high costs. Summary of the invention

[0005] In order to solve the technical problems of large size and high cost of switching discharge electrodes in the single migration tube and double migration tube in the above-mentioned prior art, the present invention provides a dielectric barrier discharge electrode structure, a bipolar time-division multiplexing dielectric barrier discharge ionization source and a migration tube detection system.

[0006] The present invention adopts the following technical solution:

[0007] On the one hand, the present invention provides a dielectric barrier discharge electrode structure, which is arranged in the ionization source, and the electrode structure includes an insulating tube, a first metal electrode and a second metal electrode, the first metal electrode is located inside the insulating tube, and the second metal electrode is located outside the insulating tube.

[0008] Preferably, the second metal electrode is a bare spiral metal wire electrode, and the second metal electrode is sleeved on the outside of the insulating tube or arranged in parallel on the outside of the insulating tube.

[0009] Preferably, the second metal electrode is a bare straight metal wire electrode, and the second metal electrode is arranged in parallel with the insulating tube.

[0010] Preferably, the first metal electrode and the second metal electrode are made of a material selected from the group consisting of stainless steel, platinum, gold, tungsten and iridium, and the insulating tube is made of a material selected from the group consisting of polyimide, ceramic and quartz.

[0011] On the other hand, the present invention also provides a bipolar time-sharing multiplexed dielectric barrier discharge ionization source, which is arranged in a migration tube, including a high-voltage pulse generating system and a repeller and a pull-out electrode arranged in parallel and at intervals in the migration tube, and a positive ion electrode structure and a negative ion electrode structure are provided in the ionization region formed between the repeller and the pull-out electrode, and the positive ion electrode structure and the negative ion electrode structure adopt the electrode structure described in the claim above, and the high-voltage pulse generating system includes a positive ion high-voltage pulse generating system and a negative ion high-voltage pulse generating system, and the positive ion electrode structure is connected to the positive ion high-voltage pulse generating system, and the negative ion electrode structure is connected to the negative ion high-voltage pulse generating system, and during time-sharing multiplexing, the positive ion electrode structure generates positive ions, and the negative ion electrode structure generates negative ions, and the repulsive electric field direction between the repeller and the pull-out electrode is switched by the corresponding high-voltage pulse generating system.

[0012] Further preferably, an insulating partition is further provided in the migration tube to separate the positive ion electrode structure from the negative ion electrode structure, and the positive ion electrode structure and the negative ion electrode structure are arranged in parallel and in the same plane.

[0013] Further preferably, the positive ion high-voltage pulse generating system and the negative ion high-voltage pulse generating system are provided with a high-voltage pulse generating circuit and a high-voltage DC voltage divider circuit; the high-voltage pulse generating circuit in the positive ion high-voltage pulse generating system is electrically connected to the positive ion electrode structure to generate positive ions; the high-voltage pulse generating circuit in the negative ion high-voltage pulse generating system is electrically connected to the negative ion electrode structure to generate negative ions; the high-voltage DC voltage divider circuit is electrically connected to the repeller and the puller.

[0014] Further preferably, the high-voltage pulse generating circuit includes a positive ion floating potential matching circuit, a negative ion floating potential matching circuit and two identical forward or flyback inverter circuits; one of the inverter circuits, the positive ion floating potential matching circuit and the high-frequency transformer constitute a positive ion high-voltage pulse generating circuit, and the positive ion floating potential matching circuit is connected to the positive ion electrode structure; the other inverter circuit, the negative ion floating potential matching circuit and the high-frequency transformer constitute a negative ion high-voltage pulse generating circuit, and the negative ion floating potential matching circuit is connected to the negative ion electrode structure.

[0015] The present invention also provides a bipolar time-division multiplexed dielectric barrier discharge ionization source migration tube detection system, comprising a migration tube, an ionization source, an ion gate and a Faraday plate, wherein the ionization source and the Faraday plate are arranged at two end positions in the migration tube, the ion gate is arranged between the ionization source and the Faraday plate, a drift region is formed between the ion gate and the Faraday plate, and a stable migration electric field is formed between the ion gate and the Faraday plate, and a charged group reaction region is formed between the ion gate and the ionization source, and an air outlet is arranged at one end of the migration tube close to the ionization source. The migration tube is provided with a sample gas port connected to the charged group reaction zone, and one end of the migration tube close to the Faraday disk is also provided with a drift gas port connected to the drift zone. The ionization source is the dielectric barrier discharge ionization source. By switching the positive ion high-voltage pulse generation system and the negative ion high-voltage pulse generation system in the ionization source, corresponding positive ions or negative ions are generated, and the migration electric field direction and the repulsive field direction of the repeller and the puller are switched accordingly to detect positively charged particles and negatively charged particles.

[0016] The technical solution of the present invention has the following advantages:

[0017] A. The present invention uses a single migration tube and dual electrodes in a time-sharing multiplexing manner, adopts a single migration tube to switch the polarity of the migration electric field, designs two sets of DBD ionization sources with different polarities in the ionization region for time-sharing multiplexing to produce ionized samples with different polarities, and uses two high-frequency transformers with opposite polarities to generate high-voltage pulses. A small-sized high-frequency transformer can be manufactured to replace the high-voltage semiconductor device used to switch the discharge electrode, and at the same time, the number of migration tubes and high-voltage semiconductors used can be reduced, effectively reducing the volume and reducing the manufacturing cost.

[0018] B. The electrode structure adopted in the present invention cooperates with the spiral electrode and the insulating tube in space, so that the discharge process occurs evenly around the gap between the spiral electrode and the insulating tube, which can effectively avoid local overheating. At the same time, the insulating tube can be used to prevent the electrochemical reaction from occurring between the electrodes, effectively increasing the continuous use time of the electrode to more than 2000 hours.

[0019] C. The ionization source used in the present invention can replace the function of the radioactive ionization source in the IMS technology. It has been verified by experiments that the total amount of ions generated by the present invention is at least twice that of the Ni63 radioactive source commonly used in the industry, and the sample components can be analyzed very accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the spirally wound electrode structure provided by the present invention;

[0022] Figure 2 A schematic diagram of the parallel spiral electrode structure provided by the present invention;

[0023] Figure 3 A schematic diagram of the parallel needle-shaped electrode structure provided by the present invention;

[0024] Figure 4 A schematic diagram of the structure of a spiral bipolar time-division multiplexed dielectric barrier discharge ionization source provided by the present invention;

[0025] Figure 5 for Figure 4 The front view shown;

[0026] Figure 6 A working schematic diagram (cross-sectional structure) of the dielectric barrier discharge ionization source provided by the present invention;

[0027] Figure 7A schematic diagram of plasma generation in a dielectric barrier discharge ionization source provided by the present invention (a longitudinal cross-sectional structure using a spiral electrode structure);

[0028] Figure 8 A block diagram of the dielectric barrier discharge ionization source provided by the present invention;

[0029] Fig. 9 A topological diagram of a dual-transistor forward inverter-type high-voltage pulse generating circuit used in the high-voltage pulse generating circuit of the present invention;

[0030] Fig.10 for Fig. 9 The inverter circuit in the circuit adopts the flyback inverter type high voltage pulse generating circuit topology diagram;

[0031] Fig.11 A schematic diagram of the electrical connection between the dielectric barrier discharge ionization source and the migration tube provided by the present invention;

[0032] Fig.12 A dielectric barrier discharge ionization source migration tube detection system provided by the present invention;

[0033] Fig.13 A diagram comparing the product ion peaks of the dielectric barrier discharge ionization source and the Ni63 ionization source provided by the present invention.

[0034] The following are marked in the figure:

[0035] 1-Ionization source

[0036] 11-High voltage pulse generation system

[0037] 11a-high voltage pulse generating circuit, 11b-high voltage DC voltage dividing circuit

[0038] 12-Dielectric barrier discharger

[0039] 121-repelling pole, 122-pulling pole

[0040] 13-positive ion electrode structure, 14-negative ion electrode structure, 15-insulating separator

[0041] 2-Electrode structure

[0042] 21-insulating tube, 22-first metal electrode, 23-second metal electrode

[0043] 3-Migration tube

[0044] 3a-gas outlet, 3b-sample gas outlet, 3c-bleaching gas outlet

[0045] 4-Ion gate; 5-Faraday disk

[0046] a-ionization region; b-drift region; c-charged group reaction region. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] like Figures 1 to 3 As shown, the present invention provides a dielectric barrier discharge electrode structure, which is arranged in an ionization source 1, and the electrode structure 2 includes an insulating tube 21, a first metal electrode 22 and a second metal electrode 23, wherein the first metal electrode 22 is located inside the insulating tube 21, and the second metal electrode 23 is located outside the insulating tube 21. The second metal electrode 23 is a bare spiral metal wire electrode, and the second metal electrode 23 is sleeved on the outside of the insulating tube 21 (such as Figure 1 ) or arranged in parallel outside the insulating tube 21 (as shown in Figure 2 As shown in Figure 3 As shown, the second metal electrode 23 may also be a bare straight metal wire electrode, and the second metal electrode 23 is arranged in parallel with the insulating tube 21 .

[0051] The first metal electrode 22 and the second metal electrode 23 are preferably made of a material selected from the group consisting of stainless steel, platinum, gold, tungsten and iridium, and the insulating tube 21 is preferably made of a material selected from the group consisting of polyimide, ceramic and quartz.

[0052] The present invention uses a bare spiral metal wire electrode or a straight metal wire electrode as the second metal electrode in combination with the insulating tube, so that the discharge process occurs evenly around the gap between the second metal electrode and the insulating tube. Figure 7 As shown, when the DBD ionization source is working, plasma is generated on the outer wall of the insulating medium layer along the spiral electrode orbit, which can effectively avoid local overheating. At the same time, the insulating tube can be used to prevent electrochemical reactions from occurring between the electrodes, effectively increasing the continuous use time of the electrodes to more than 2000 hours.

[0053] like Figure 4 , Figure 5 and Figure 8 As shown, the present invention provides a bipolar time-division multiplexed dielectric barrier discharge ionization source, which is arranged in a migration tube 3, including a high-voltage pulse generating system 11 and a repeller 121 and a pull-out electrode 122 arranged in parallel and spaced in the migration tube 3, and an ionization region a formed between the repeller 121 and the pull-out electrode 122 is provided with a positive ion electrode structure 13 and a negative ion electrode structure 14, and the positive ion electrode structure 13 and the negative ion electrode structure 14 adopt the above Figures 1 to 3 The electrode structure described. In the present invention, two sets of high-voltage pulse generating systems 11 are provided, namely a positive ion high-voltage pulse generating system for generating positive ions and a negative ion high-voltage pulse generating system for generating negative ions. The positive ion electrode structure 13 is connected to the positive ion high-voltage pulse generating system, and the negative ion electrode structure 14 is connected to the negative ion high-voltage pulse generating system. When time-sharing multiplexing is used, they act on the same migration tube. When only the positive ion high-voltage pulse generating system is turned on, the positive ion electrode structure 13 generates positive ions. When only the negative ion high-voltage pulse generating system is turned on, the negative ion electrode structure 14 generates negative ions. The direction of the repulsive electric field between the repelling electrode 121 and the pulling-out electrode 122 is switched by the corresponding high-voltage pulse generating system 11. Figure 8 As shown, the ionization source 1 includes a high-voltage pulse generating system 11 and a dielectric barrier amplifier 12, wherein the high-voltage pulse generating system 11 includes a power supply system, a reverse airflow control system, a high-voltage pulse generating circuit 11a, an isolated control system and a high-voltage DC voltage dividing circuit 11b; the dielectric barrier amplifier 12 includes a repeller 121, a pull-out electrode 122 and an electrode structure 2. The dielectric barrier discharger 12 serves as a load of the high-voltage pulse generating circuit, generates a charged particle cloud using a high-voltage pulse, and pushes the charged particle cloud into the drift region through the repulsive electric field generated by the repeller and the pull-out electrode.

[0054] like Figure 4 and Figure 5As shown, as a further preferred embodiment of the present invention, an insulating partition 15 is further provided in the migration tube 3 to separate the positive ion electrode structure 13 and the negative ion electrode structure 14, and the positive ion electrode structure 13 and the negative ion electrode structure 14 are arranged in parallel and coplanar. For example, if the positive ion electrode structure 13 generates positive ions, the negative ion electrode structure 14 is not connected to the negative ion high voltage pulse generating system at this time, and it does not generate negative ions. However, if negative ions have been generated before, some negative ions will be attached to the negative ion electrode structure 14 at this time. The setting of the insulating partition 15 can prevent the attached part of the negative ions from neutralizing with the generated positive ions, thereby making the detection and analysis of the product more accurate.

[0055] The process of generating charged particles when the DBD ionization source is working is as follows Figure 6 As shown in FIG. 1 , the high-voltage pulse generating system provides an instantaneous high-voltage electric field to the first metal electrode and the second metal electrode, so that charged electric phase particles are generated near the electrodes and then pushed out by the repulsive electric field generated by the repeller and the puller. Fig.12 The charged group reaction zone c combines with the sample, and finally the spectrum is obtained by using the IMS principle to analyze the sample components.

[0056] After completing the detection of positively charged particles, the positive ion high voltage pulse generation system stops working, then switches the direction of the migration electric field and the direction of the repulsion electric field, and then starts the negative ion high voltage pulse generation system to detect negatively charged particles. Repeated switching of positive and negative ion generation and detection can realize the use of the DBD ionization source in a single migration tube.

[0057] The present invention provides a high-voltage pulse generating circuit 11a and a high-voltage DC voltage dividing circuit 11b in both the positive ion high-voltage pulse generating system and the negative ion high-voltage pulse generating system. Figure 4 In the positive ion pulse generating system provided by the present invention, the high-voltage pulse generating circuit 11a is electrically connected to the corresponding positive ion electrode structure 13 to generate corresponding positive ions, and the high-voltage pulse generating circuit 11a in the negative ion pulse generating system is electrically connected to the negative ion electrode structure 14 to generate negative ions, thereby forming a structure for time-sharing multiplexing to generate positive ions or negative ions; the high-voltage DC voltage divider circuit 11b is electrically connected to the repeller 121 and the pull-out electrode 122, respectively, to generate a stable repulsive electric field between the repeller and the pull-out electrode.

[0058] like Fig. 9As shown, the positive ion pulse generating system in the present invention includes a positive ion floating potential matching circuit on the upper right side of the figure, an inverter circuit on the upper left side, and a high-frequency transformer between the two, and the positive ion floating potential matching circuit is electrically connected to the positive and negative poles of the positive ion electrode structure; the negative ion pulse generating system includes a negative ion floating potential matching circuit on the lower right side of the figure, an inverter circuit on the lower left side, and a high-frequency transformer between the two, and the negative ion floating potential matching circuit is electrically connected to the positive and negative poles of the negative ion electrode structure. Both inverter circuits use forward inverter circuits.

[0059] Fig. 9 Q1-Q4 are semiconductor switching devices, D1-D4 are diodes, of course Fig. 9 The inverter circuit in can also be used Fig.10 The flyback inverter circuit shown in the figure and the bridge inverter circuit can also realize this function.

[0060] like Fig.11 and Fig.12 As shown, the present invention also provides a bipolar time-division multiplexed dielectric barrier discharge ionization source migration tube detection system, comprising a migration tube 3, an ionization source 1, an ion gate 4 and a Faraday plate 5, wherein the ionization source 1 and the Faraday plate 5 are arranged at two end positions in the migration tube 3, the ion gate 4 is arranged between the ionization source 1 and the Faraday plate 5, a drift region b is formed between the ion gate 4 and the Faraday plate 5, and a stable migration electric field is formed between the ion gate 4 and the Faraday plate 5, and a charged group reaction region c is formed between the ion gate 4 and the ionization source 1, an end of the migration tube 3 close to the ionization source 1 is provided with an outlet 3a, and the migration tube 3 is provided with an outlet 3a. A sample gas port 3b is provided which is connected to the charged group reaction zone c. One end of the migration tube 3 close to the Faraday disk 5 is also provided with a drift gas port 3c which is connected to the drift zone b. The ionization source 1 is the above-mentioned dielectric barrier discharge ionization source. By switching the positive ion high-voltage pulse generating system and the negative ion high-voltage pulse generating system in the ionization source 1, corresponding positive ions or negative ions are generated, and the migration electric field direction and the repulsive field direction between the repeller 121 and the pull-out electrode 122 are switched accordingly, positively charged particles and negatively charged particles are generated by time-sharing multiplexing, and the charged particles are detected.

[0061] The present invention realizes the ionization of the sample by adopting a bipolar DBD ionization source, then injects ions into the drift region through an ion gate, separates gas phase ions by using a migration electric field, and finally obtains a DBD-IMS spectrum by detecting ion signals through a Faraday disk to realize the analysis of sample components.

[0062] The bipolar time-division multiplexed dielectric barrier discharge ionization source migration tube detection system provided by the present invention can replace the function of the radioactive ionization source in the IMS technology, and the total amount of ions generated is at least twice that of the Ni63 radioactive source commonly used in the industry.

[0063] like Fig.13 As shown in the figure, under the same experimental method, the spiral bipolar time-division multiplexed dielectric barrier discharge ionization source (DBD ionization source) with a total power of 0.6W was compared with the 3mCi Ni63 radioactive ionization source to detect 9.55mg / m 3 When HCN is used, the product ion peak of the DBD ionization source is about 7 times that of the radioactive ionization source.

[0064] The present invention uses a single migration tube and dual electrodes in a time-sharing multiplexing manner to reduce the number of migration tubes and high-voltage semiconductors used, effectively reducing the volume and manufacturing cost.

[0065] Anything not described in the present invention is applicable to the prior art.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A dielectric barrier discharge electrode structure, which is arranged in the ionization source (1), characterized in that: The electrode structure (2) comprises an insulating tube (21), a first metal electrode (22) and a second metal electrode (23), wherein the first metal electrode (22) is located inside the insulating tube (21) and the second metal electrode (23) is located outside the insulating tube (21).

2. The dielectric barrier discharge electrode structure according to claim 1, characterized in that: The second metal electrode (23) is a bare spiral metal wire electrode, and the second metal electrode (23) is sleeved on the outside of the insulating tube (21) or arranged in parallel on the outside of the insulating tube (21).

3. The dielectric barrier discharge electrode structure according to claim 1, characterized in that: The second metal electrode (23) is a bare straight metal wire electrode, and the second metal electrode (23) is arranged in parallel with the insulating tube (21).

4. The dielectric barrier discharge electrode structure according to claim 1, characterized in that: The first metal electrode (22) and the second metal electrode (23) are made of a material selected from the group consisting of stainless steel, platinum, gold, tungsten and iridium, and the insulating tube (21) is made of a material selected from the group consisting of polyimide, ceramic and quartz.

5. A bipolar time-division multiplexed dielectric barrier discharge ionization source, which is arranged in a migration tube (3), comprising a high-voltage pulse generating system (11) and a repeller (121) and a puller (122) arranged in parallel and spaced apart in the migration tube (3), characterized in that: A positive ion electrode structure (13) and a negative ion electrode structure (14) are provided in the ionization region (a) formed between the repeller (121) and the pull-out electrode (122). The positive ion electrode structure (13) and the negative ion electrode structure (14) adopt the electrode structure described in any one of claims 1 to 4. The high-voltage pulse generating system (11) comprises a positive ion high-voltage pulse generating system and a negative ion high-voltage pulse generating system. The positive ion electrode structure (13) is connected to the positive ion high-voltage pulse generating system, and the negative ion electrode structure (14) is connected to the negative ion high-voltage pulse generating system. When time-sharing multiplexing is performed, the positive ion electrode structure (13) generates positive ions, and the negative ion electrode structure (14) generates negative ions, and the direction of the repulsive electric field between the repeller (121) and the pull-out electrode (122) is switched by the corresponding high-voltage pulse generating system (11).

6. The bipolar time-division multiplexed dielectric barrier discharge ionization source according to claim 5, characterized in that: An insulating partition (15) is also provided in the migration tube (3) to separate the positive ion electrode structure (13) from the negative ion electrode structure (14); the positive ion electrode structure (13) and the negative ion electrode structure (14) are arranged in parallel and on the same plane.

7. The bipolar time-division multiplexed dielectric barrier discharge ionization source according to claim 5, characterized in that: The positive ion high-voltage pulse generating system and the negative ion high-voltage pulse generating system are provided with a high-voltage pulse generating circuit (11a) and a high-voltage direct current voltage dividing circuit (11b); the high-voltage pulse generating circuit (11a) in the positive ion high-voltage pulse generating system is electrically connected to the positive ion electrode structure (13) to generate positive ions; the high-voltage pulse generating circuit in the negative ion high-voltage pulse generating system is electrically connected to the negative ion electrode structure (14) to generate negative ions; the high-voltage direct current voltage dividing circuit (11b) is electrically connected to the repeller (121) and the puller (122).

8. The bipolar time-division multiplexed dielectric barrier discharge ionization source according to claim 7, characterized in that: The high-voltage pulse generating circuit (11a) includes a positive ion floating potential matching circuit, a negative ion floating potential matching circuit and two identical forward or flyback inverter circuits; one of the inverter circuits, the positive ion floating potential matching circuit and a high-frequency transformer form a positive ion high-voltage pulse generating circuit, and the positive ion floating potential matching circuit is connected to the positive ion electrode structure (13); the other inverter circuit, the negative ion floating potential matching circuit and a high-frequency transformer form a negative ion high-voltage pulse generating circuit, and the negative ion floating potential matching circuit is connected to the negative ion electrode structure (14).

9. A bipolar time-division multiplexed dielectric barrier discharge ionization source migration tube detection system, comprising a migration tube (3), an ionization source (1), an ion gate (4) and a Faraday plate (5), wherein the ionization source (1) and the Faraday plate (5) are arranged at two end positions in the migration tube (3), the ion gate (4) is arranged between the ionization source (1) and the Faraday plate (5), and a drift region (b) is formed between the ion gate (4) and the Faraday plate (5), and the two form a stable A migration electric field is provided, a charged group reaction zone (c) is formed between the ion gate (4) and the ionization source (1), a gas outlet (3a) is provided at one end of the migration tube (3) close to the ionization source (1), a sample gas port (3b) connected to the charged group reaction zone (c) is provided on the migration tube (3), and a drift gas port (3c) connected to the drift zone (b) is provided at one end of the migration tube (3) close to the Faraday disk (5), wherein: The ionization source (1) is a dielectric barrier discharge ionization source as described in any one of claims 5 to 9, and the positive ions or negative ions are generated by switching the positive ion high-voltage pulse generating system (111) and the negative ion high-voltage pulse generating system (112) in the ionization source (1), and the migration electric field direction and the repulsive field direction between the repeller (121) and the pull-out electrode (122) are correspondingly switched to detect positively charged particles and negatively charged particles.

Images