An ion migration system

Abstract

The application provides an ion migration system, comprising a first high-voltage source, a migration spectrometer and a voltage stabilizing module. The voltage stabilizing module is arranged to output a second high-voltage source to the migration tube, so that the migration tube can form an electric field to drive the migration of ions. In this way, one high-voltage source corresponding to the migration tube can be saved, cost is saved, and the area of the overall system is also reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ion mobility spectrometer, and particularly to an ion mobility system. BACKGROUND

[0002] In an ion mobility spectrometer based on a mobility tube, there are generally an ionization source, a mobility tube and a detector, etc. A high voltage is needed in the mobility tube to create an electric field in the mobility tube so that the ions generated at the ionization source fly to the detector. A high voltage source is also needed for the ionization source except for a radioactive source. The existing ion mobility spectrometer technology based on a non-radioactive ionization source often needs to use two high voltage sources, one for the ionization source and the other for driving the ions to migrate. SUMMARY

[0003] Therefore, the present application aims to solve the problem of needing to use two high voltage sources simultaneously, and to provide a new ion mobility system.

[0004] In a first aspect, the present application provides an ion mobility system, comprising: a first high voltage source; a mobility spectrometer, wherein an ion source of the mobility spectrometer is connected to the first high voltage source; and a voltage stabilizing module, wherein one end of the voltage stabilizing module is connected to the first high voltage source and a mobility tube of the mobility spectrometer respectively, and the other end of the voltage stabilizing module is connected to a ground terminal, and the voltage stabilizing module is used to output a second high voltage source to the mobility tube.

[0005] Further, the voltage stabilizing module comprises a voltage stabilizer or a voltage reference element.

[0006] Further, the voltage stabilizing module comprises n series-connected voltage stabilizing diodes; a negative electrode of a kth voltage stabilizing diode is connected to a positive electrode of a (k+1)th voltage stabilizing diode, k is an integer greater than or equal to 1 and less than n; a positive electrode of a first voltage stabilizing diode is connected to the ground terminal, and a negative electrode of an nth voltage stabilizing diode is connected to the first high voltage source.

[0007] Further, the voltage stabilizing module comprises n series-connected voltage stabilizing diodes; a positive electrode of a kth voltage stabilizing diode is connected to a negative electrode of a (k+1)th voltage stabilizing diode, k is an integer greater than or equal to 1 and less than n; a negative electrode of a first voltage stabilizing diode is connected to the ground terminal, and a positive electrode of an nth voltage stabilizing diode is connected to the first high voltage source.

[0008] Further, the ion mobility system further comprises: a load resistor, one end of the load resistor is connected to the first high voltage source, and one end of the load resistor is connected to the ion source.

[0009] Further, the ion migration system further comprises a voltage division module, one end of the voltage division module is connected with the migration tube, the voltage stabilizing module and the first high voltage source respectively, and the other end of the voltage division module is connected with the ground end, and the voltage division module is used to receive the second high voltage source.

[0010] Further, the migration spectrometer comprises a reaction zone, an ion gate and a migration zone, the migration tube is formed by stacking a plurality of electrode rings, and the voltage division module is connected with the electrode rings.

[0011] Further, the voltage division module comprises m voltage division resistors R1-Rm connected in series, the number of the voltage division resistors corresponds to the number of the electrode rings of the migration tube, one end of each voltage division resistor is connected with the electrode ring of the migration tube, one end of the first voltage division resistor R1 is connected with the ground end, and one end of the mth voltage division resistor Rm is connected with the voltage stabilizing module and the first high voltage source respectively.

[0012] Further, the ion migration system further comprises a shielding net and a capacitor, one end of the shielding net is connected with one end of the first voltage division resistor R1, one end of the capacitor is connected with one end of the first voltage division resistor R1, and the other end of the capacitor is connected with the other end of the first voltage division resistor R1.

[0013] The technical scheme of the present application has the following advantages:

[0014] The present application provides an ion migration system, the voltage stabilizing module is used to output the second high voltage source to the migration tube, the migration tube can form an electric field to drive the migration of ions, and one high voltage source corresponding to the migration tube can be saved, the cost is saved, and the area of the overall system is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 The functional module diagram of the ion migration system provided in the embodiments of the present application;

[0017] Figure 2 The functional module diagram of the ion migration system provided in the embodiments of the present application;

[0018] Figure 3 A functional module diagram of an ion migration system provided in other embodiments of the present invention; Description of the drawings:

[0020] Ion migration system 100; pressure divider module 130; migration spectrometer 110;

[0021] Voltage stabilizing module 120; migration tube 102; ion source 101;

[0022] Detector 103; amplifier 104. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 and Figure 2 As shown, the present invention provides an ion migration system 100 , comprising: a first high voltage source HV-IN, a migration spectrometer 110 and a voltage stabilizing module 120 .

[0028] The ion source of the migration spectrometer 110 is connected to the first high voltage source HV-IN.

[0029] One end of the voltage stabilizing module 120 is connected to the first high voltage source HV-IN and the migration tube 101 of the migration spectrometer, and the other end of the voltage stabilizing module 120 is connected to the ground GND. The voltage stabilizing module 120 is used to output a second high voltage source to the migration tube 102.

[0030] The ion migration system 100 provided by the present application can output a second high voltage source to the migration tube 102 through the voltage stabilizing module 120, so that the migration tube 102 can form an electric field to drive the migration of ions. In this way, one high voltage source corresponding to the migration tube 102 can be saved, the cost is reduced, and the overall system area is also reduced.

[0031] Reference Figure 2 The structure and function of each module will be described in detail below.

[0032] The first high voltage source HV-IN is used for the ion source 101 and is connected to the ion source 101 to form charged ions for detecting samples.

[0033] The migration spectrometer 110 includes a reaction zone, an ion gate, and a migration zone. The reaction zone is arranged between the migration zone and the ion source 101 and is close to the ion source 101. The migration spectrometer 110 further includes a detector 103 and an amplifier 104 connected to the detector. The migration tube 102 includes a plurality of electrode rings. The migration tube 102 is composed of electrode sheets (i.e., electrode rings) and insulating pads stacked alternately.

[0034] The migration spectrometer refers to the principle, method, and instrument for characterizing substances according to the speed of a substance group (defined as a gaseous ion group) in an electric field and a supporting gas environment. The present application adopts corona discharge of the ion source 101. A sharp needle or metal wire is placed 2-8 mm away from a metal plate or a discharge electrode. The voltage difference between the needle and the plate is 1-3 kV. Discharge occurs in the gap between the needle or wire and the metal plate. The ions formed by discharge ionization and 63 The ions formed in the Ni ion source are very similar. These ions subsequently participate in ion-molecule reactions with sample molecules.

[0035] In the embodiment, the ion migration system 100 further includes a load resistor Rc. One end of the load resistor Rc is connected to the first high voltage source HV-IN, and the other end of the load resistor Rc is connected to the ion source 101. The load resistor Rc functions to limit the current because the size of the current affects the effect of the corona discharge ion source 101.

[0036] In the embodiment, the voltage stabilizing module 120 comprises n series-connected voltage stabilizing diodes D1-Dn; in the embodiment, the connection mode is positive mode, specifically, the negative electrode of the kth voltage stabilizing diode is connected to the positive electrode of the (k+1)th voltage stabilizing diode, k is an integer greater than or equal to 1 and less than n; the positive electrode of the first voltage stabilizing diode D1 is connected to the ground end, and the negative electrode of the nth voltage stabilizing diode Dn is connected to the first high-voltage source. Figure 3 As shown in the figure, in other embodiments, the connection mode is negative mode, specifically, the positive electrode of the kth voltage stabilizing diode is connected to the negative electrode of the (k+1)th voltage stabilizing diode, k is an integer greater than or equal to 1 and less than n; the negative electrode of the first voltage stabilizing diode is connected to the ground end, and the positive electrode of the nth voltage stabilizing diode is connected to the first high-voltage source.

[0037] The application utilizes the characteristics of voltage stabilizing diodes, utilizes the phenomenon that the current can change in a large range while the voltage is basically unchanged in the reverse breakdown state of PN junction. The diode is a semiconductor device with very high resistance before the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance decreases to a very small value, and in this low resistance area, the current increases while the voltage remains constant. Voltage stabilizing diodes are graded according to breakdown voltage, and because of this characteristic, voltage stabilizing diodes are mainly used as voltage stabilizers or voltage reference elements. Voltage stabilizing diodes can be connected in series for use at higher voltages, and higher stable voltages can be obtained by series connection. Therefore, in other embodiments, the voltage stabilizing module comprises a voltage stabilizer or a voltage reference element.

[0038] In the embodiment, the ion migration system 100 further comprises a voltage dividing module 130, one end of the voltage dividing module 130 is connected to the migration tube 102, the voltage stabilizing module 120 and the first high-voltage source HV-IN respectively, and the other end of the voltage dividing module is connected to the ground end GND.

[0039] The voltage dividing module 120 comprises m series-connected voltage dividing resistors R1-Rm, the number of voltage dividing resistors corresponds to the number of electrode rings of the migration tube, and one end of each voltage dividing resistor corresponds to the electrode ring of the migration tube 102; one end of the first voltage dividing resistor R1 is connected to the ground end, and one end of the mth voltage dividing resistor Rm is connected to the voltage stabilizing module.

[0040] The application applies a gradient voltage on the electrode sheet by means of resistance voltage division, forms a uniform linear electric field, and the charged ions of the ion source 101 finally reach the detector under the action of the electric field, and the detection of the charged ions is finally realized after the amplifier.

[0041] In the embodiment, one end of the first voltage dividing resistor R1 is connected to the shielding net PAG to avoid the induced current generated by ions close to the detector, and is connected between the voltage dividing resistors R1 and R2. One end of the first voltage dividing resistor R1 is connected to one end of the capacitor C1, and the other end of the first voltage dividing resistor R1 is connected to the other end of the capacitor C1. The capacitor C1 functions as a filter.

[0042] The working principle of the application is explained as follows. The first high voltage source HV-IN adopts direct current corona, and the output of the first high voltage source HV-IN is 6000V. 25 voltage stabilizing tubes with a stable output of 100V are used as a voltage stabilizing module. At this time, the voltage of the mth electrode ring at the front end of the migration tube 102 is 2500V, and thus the load of the ion source does not need to be considered. The output of 6000V of the HV-IN is directly added to the ion source, and the resistance between the 6000V voltage and the ion source 101 functions to limit the current, because the size of the current affects the effect of the corona discharge ionization source. R1-Rm are voltage dividing resistors, and the purpose is to be connected with the electrodes in the migration tube 102 to provide a linear electric field required for ion migration in the migration tube 102. The application divides a part of the higher voltage value by using the series connection of the voltage stabilizing diodes as the voltage stabilizing module 120, and adds the stable voltage to the migration tube 102 while also driving the corona discharge ionization source. Further, one high voltage source corresponding to the migration tube can be saved, the cost is saved, and the area of the overall system is also reduced.

[0043] Obviously, the above embodiment is only an example for clearly illustrating, and is not a limitation to the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the application.

Claims

1. An ion migration system, characterized in that: include: a first high voltage source; A mobility spectrometer, wherein the ion source of the mobility spectrometer is connected to the first high voltage source; as well as A voltage stabilizing module, one end of which is respectively connected to the first high voltage source and the migration tube of the migration spectrometer, and the other end of which is connected to the ground terminal. The voltage stabilizing module is used to output a second high voltage source to the migration tube; the voltage stabilizing module includes n voltage stabilizing diodes connected in series; the positive electrode of the kth voltage stabilizing diode is connected to the negative electrode of the k+1th voltage stabilizing diode, where k is an integer greater than or equal to 1 and less than n; the negative electrode of the first voltage stabilizing diode is connected to the ground terminal, and the positive electrode of the nth voltage stabilizing diode is connected to the first high voltage source.

2. The ion migration system according to claim 1, characterized in that The voltage stabilization module includes a voltage stabilizer or a voltage reference element.

3. The ion migration system according to claim 1, characterized in that The voltage stabilizing module includes n voltage stabilizing diodes connected in series; the cathode of the kth voltage stabilizing diode is connected to the anode of the k+1th voltage stabilizing diode, where k is an integer greater than or equal to 1 and less than n; the anode of the 1st voltage stabilizing diode is connected to the ground terminal, and the cathode of the nth voltage stabilizing diode is connected to the first high voltage source.

4. The ion migration system according to claim 1, characterized in that Also includes: A load resistor, one end of which is connected to the first high voltage source, and one end of which is connected to the ion source.

5. The ion migration system according to claim 1, characterized in that Also includes: A voltage divider module, one end of which is respectively connected to the migration tube, the voltage stabilizing module and the first high voltage source, and the other end of which is connected to the ground end, is used to receive the second high voltage source.

6. The ion migration system according to claim 1 or 5, characterized in that: The migration spectrometer includes a reaction area, an ion gate and a migration area; the migration tube is formed by stacking a plurality of electrode rings, and the voltage divider module is connected to the electrode rings.

7. The ion migration system according to claim 5, characterized in that The voltage divider module includes m voltage divider resistors R1 to Rm connected in series. The number of the voltage divider resistors corresponds to the number of electrode rings of the migration tube. One end of each voltage divider resistor is connected to an electrode ring of the migration tube. One end of the first voltage divider resistor R1 is connected to the ground terminal, and one end of the mth voltage divider resistor Rm is connected to the voltage stabilizing module.

8. The ion migration system according to claim 7, characterized in that Also includes: A shielding net and a capacitor, wherein the shielding net is connected to one end of the first voltage-dividing resistor R1; one end of the capacitor is connected to one end of the first voltage-dividing resistor R1, and the other end of the capacitor is connected to the other end of the first voltage-dividing resistor R1.

9. The ion migration system according to claim 1, characterized in that The migration spectrometer is defined as a reaction zone and a migration zone, wherein the reaction zone is arranged between the migration zone and the ion source and close to the ion source; the migration spectrometer further comprises a detector and an amplifier connected to the detector.

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