CN108956750A - A kind of ion mobility spectrometry apparatus working in low air pressure condition - Google Patents
A kind of ion mobility spectrometry apparatus working in low air pressure condition Download PDFInfo
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- CN108956750A CN108956750A CN201810558724.6A CN201810558724A CN108956750A CN 108956750 A CN108956750 A CN 108956750A CN 201810558724 A CN201810558724 A CN 201810558724A CN 108956750 A CN108956750 A CN 108956750A
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- mobility spectrometry
- air pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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Abstract
The invention discloses a kind of ion mobility spectrometry apparatus for working in low air pressure condition, it is a kind of ion mobility spectrometry apparatus that ion is transmitted between high vacuum small spectrometer and atmospheric pressure sampling system.The device include between atmospheric pressure and high vacuum provide ion transmission and isolated ion transfer conduit, device is kept hypobaric sampling system, sealed insulation inner sleeve and be placed on insulation inner sleeve outside several migration rings, and the detection device comprising migrating pipe end, it is placed on the resistance that welding resistance value is equal on several migration rings outside insulation inner sleeve.By air pressure inside air pump regulating device and it can make to be mingled with different ions together using the electric field that DC power supply adjusts Disengagement zone and separate and ion is transmitted.Apparatus of the present invention size while keeping air-tightness is small and light weight, convenient for being also convenient for sample introduction with mass spectrometry below.
Description
Technical field
The present invention relates to analysis and detection technologies, a kind of in high vacuum small spectrometer and atmospheric pressure more particularly to providing
The ion mobility spectrometry apparatus of ion is transmitted between sampling system.
Background technique
Analysis instrument is ingredient, structure and the status information that modern society people obtain substance, understanding and exploration nature rule
The indispensable powerful of rule, is an important component of Modern Scientific Instruments.General common instrument had in the past
Mass spectrograph, chromatograph etc., but the instruments such as current mass chromatography to substance carry out ionization detection when be readily incorporated
Foreign ion brings some negative factors to ion analysis and detection.
Mass spectrograph (Mass Spectrometer, MS) is that material molecule is ionized into ion by one kind, by mass-to-charge ratio (m/z)
It is separated and detects its intensity to make the instrument of qualitative and quantitative analysis.It is fixed in the detection simple sample of ingredient to minimize mass spectrum
Property analysis ability is good, and detection performance is superior.And it is easy to carry, easy to use, however the spectrogram of small spectrometer is easy by molten
The influence of the comparable ionics such as agent or background analyzes scarce capacity when analyzing complex sample.So generally can before mass spectrograph
The device of pre-separation is added
Interface needs are made very small when sample is entered from atmospheric pressure environment inside the mass spectrum of high vacuum environment.Atmospheric pressure
Sample introduction to mass spectrographic efficiency be about 0.1%, low efficiency.
Summary of the invention
The technical problems to be solved by the present invention are: realize it is a kind of the different ions being mingled with together can be carried out from
Son separation and the device that ion is transmitted between high vacuum small spectrometer and atmospheric pressure sampling system.
Technical problem of the invention can give by the following technical programs and solve: a kind of low air pressure condition that works in
Ion mobility spectrometry apparatus transmits ion between high vacuum small spectrometer and atmospheric pressure sampling system, comprising: guarantees ion
The inner sleeve of air pressure inside migration spectrum than the sampling system that normal atmosphere forces down, the sealed insulation being tightly connected with sampling system
Cylinder, several migration rings being placed on outside inner sleeve migrate to provide ion transfer conduit between atmospheric pressure and high vacuum
Pipe end connecting detection device.
Implement technical solution of the present invention, only need on migration ring plus high voltage (electric field generally formed is
150-300V/cm), the Disengagement zone of the present apparatus will form an electric field, be in low pressure by the air pressure inside holding meanss
State, using the difference of variety classes ion mobility carries out ion isolation, low gas in the electric field in the low pressure state
Breaking the bridge beam provides possibility to increase mass spectrometric injection port, provides a kind of ion point for current species analysis detection technique
From device.The present invention increases the " intermediate axle of hypobaric ion mobility spectrometry atmospheric pressure sampling system and mass spectrum high vacuum environment
The efficiency of transmission of ion can be improved in beam ", especially for miniature instrument, because miniature instrument is to the sample more than sample type
Anti-interference ability is bad, increases in small spectrometer front end and ion mobility spectrometry is needed to carry out initial gross separation.It is this to work in low gas
Pressure condition, structure are simple and the instrument that can be separated and be transmitted to different ions has broad application prospects.
Detailed description of the invention
Figure 1A is the ion mobility spectrometry apparatus structural principle schematic isometric one of a preferred embodiment of the invention.
Figure 1B is the ion mobility spectrometry apparatus structural principle schematic isometric two of a preferred embodiment of the invention.
Fig. 1 C is the ion mobility spectrometry apparatus structural principle schematic isometric three of a preferred embodiment of the invention.
Fig. 1 D is the ion mobility spectrometry apparatus structural principle schematic front view of a preferred embodiment of the invention.
Fig. 1 E is the ion mobility spectrometry apparatus structural principle diagrammatic side view one of a preferred embodiment of the invention.
Fig. 1 F is the ion mobility spectrometry apparatus structural principle diagrammatic side view two of a preferred embodiment of the invention.
Fig. 2A is the sample introduction head perspective view of a preferred embodiment of the invention.
Fig. 2 B is the sample introduction head front view of a preferred embodiment of the invention.
Fig. 2 C is the sample introduction head side view of a preferred embodiment of the invention.
Fig. 3 A is the inner sleeve perspective view of a preferred embodiment of the invention.
Fig. 3 B is the inner sleeve front view of a preferred embodiment of the invention.
Fig. 3 C is the inner sleeve side view of a preferred embodiment of the invention.
Fig. 3 D is the inner sleeve rearview of a preferred embodiment of the invention.
Fig. 4 A is PCB (printed circuit board) the migration ring perspective view of a preferred embodiment of the invention.
Fig. 4 B is the PCB migration ring front view of a preferred embodiment of the invention.
Fig. 4 C is the PCB migration ring top view of a preferred embodiment of the invention.
Fig. 5 A is the detection device panel figure of a preferred embodiment of the invention.
Fig. 5 B is the detection device perspective view of a preferred embodiment of the invention.
Fig. 6 is the shielding construction perspective view of a preferred embodiment of the invention.
Figure label is as follows:
Detection device 1, has thereon: Faraday plate 11, venthole 12, welding kesistance 13, capacitor 14 is welded, with mass spectrograph
Interface 15；
Ring 2 is migrated, is had thereon: 21, PCB dead ring 22 at welding kesistance, copper-plated migration ring 23；
Sampling system 3, has thereon: air-tightness fixing threaded hole 31, sample introduction interface 32, pumping or venthole 33；
Inner sleeve 4, has thereon: the air-tightness panel 41 in conjunction with detection device, air inlet or bleeding point 42, with sample introduction head
The screw hole 43 of air-tightness is kept, airtight O encloses groove 44, the screw hole 45 connecting with detection device air-tightness；
Shielding construction 5, wherein there is air pump interface 51.
Specific embodiment
The present invention is explained in detail below against attached drawing and in conjunction with preferred embodiment.
Embodiment 1
As shown in Figure 1A -1F, the present embodiment be to provide it is a kind of high vacuum small spectrometer and atmospheric pressure sampling system it
Between transmit ion ion mobility spectrometry apparatus, ion transfer conduit is provided between atmospheric pressure and high vacuum, comprising: to device
Several migration rings 2 for keeping the inner sleeve 4 of hypobaric sampling system 3 and sealed insulation and being placed on outside insulation inner sleeve 4,
The resistance that welding resistance value is equal on ring 2 is migrated, the Faraday plate 11 on pipe end connecting detection device 1 is migrated.
There is the sample introduction head with the cooperation of the input mode of ion source in 3 front end of sampling system, including for connecting air inlet air pump
Screw hole (air-tightness fixing threaded hole) 31, the sample introduction head (sample introduction interface) 32 cooperated with the input mode of ion source positioned at front end,
Pumping or venthole 33 guarantee the o-ring groove (not shown) of air-tightness for accommodating sealing ring.
The sampling system uses capillary sample inlet, prevents sample introduction from having an impact to the air pressure inside device.
There is the air-tightness interface connecting with sampling system in 4 front end of inner sleeve, there is the spiral shell that air-tightness is kept with sample introduction head thereon
Hole 43, air inlet or bleeding point 42；Inner sleeve tube rear end has air-tightness panel 41 and detection device in conjunction with detection device to realize
The airtight O circle groove 44 of air-tightness connection fixes the screw hole 45 to keep air-tightness to connect, the inner sleeve with detection device
Cylinder outer diameter is identical as the migration ring internal diameter, so that inner sleeve outer diameter and the migration ring inner diameter seal cooperate.
It migrates ring 2 and is different from legacy migration ring, baseplate material (substrate) is PCB, forms PCB dead ring 22, the PCB
22 copper coating of dead ring formed electrode on the whole constitute migration ring and dead ring 2 with substitute conventional conductive migration ring and
Dead ring, because PCB material itself acts as dead ring, such migration ring and the insulation simple light weight of ring structure.There is welding electricity thereon
21 at resistance.
1 baseplate material of detection device is also PCB, on pcb board copper facing as the Faraday plate 11 for detecting electric signal,
A kind of SMA connector (coaxial connector of widely used small-sized threaded connection) connector is connected by Faraday plate by copper facing
11 signal extracts, and 13 structure of capacitor 14 and resistance that connection migration pipe end migrates ring is arranged on pcb board.Thereon also
There are venthole 12 and mass spectrometric interface 15.
There is a shielding construction 5 behind Faraday plate, there is an air inlet 51 behind shielding construction 5；When air inlet and go out
When port is all opened, the gas in the ionic transport passages is allowed to flow to the atmosphere on the outside of the duct wall of the pipeline
Intermediate pressure section is flowed from air inlet to gas outlet.Come using can then be closed one of mouth when low pressure.The air inlet
It is also air pump interface.
Load controllable DC voltage on the migration ring by divider resistance, and from one end of the insulation inner sleeve
It is each to migrate DC voltage monotone decreasing added on ring or be incremented by the other end.The divider resistance is preferred in the present embodiment
Etc. the divider resistances of resistance values can form uniform electric field in this way on the equally distributed migration tube of resistance plus a high voltage.
The above-mentioned each component of the present embodiment, which is formed between high vacuum small spectrometer and atmospheric pressure sampling system, transmits ion
Ion mobility spectrometry apparatus, while also constituting an ion fractionation device, which is controlled to adjust by air pump
With the air pressure inside holding meanss.In practical applications, can by change air pressure inside the ion fractionation device or
The voltage on ring is migrated selectively separate and ion is transferred into small size vacuum mass spectrograph to ion.
An airtightness ion gate also can be set into the ion mobility spectrometry apparatus, for control ion motion and
Keep air-tightness inside migration tube；By applying potential difference between the wire that two groups of alternating parallels arrange, to be formed vertical
Deflection or blocking electric field in the original direction of motion of ion, can deflect ion motion trace or block ion.
Aforementioned is only the citing of this preferred embodiment, and however, it is not limited to this.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, several equivalent substitute or obvious modifications are made, and performance or use is identical, all
It shall be regarded as belonging to protection scope of the present invention.
Claims (11)
1. a kind of ion mobility spectrometry apparatus for working in low air pressure condition, characterized by comprising: guarantee inside ion mobility spectrometry
Air pressure than sampling system that normal atmosphere forces down, the sealed insulation being tightly connected with sampling system inner sleeve, be placed on inner sleeve
Several migration rings outside cylinder, to provide ion transmission and isolated migration pipeline, migration between atmospheric pressure and high vacuum
Pipe end connecting detection device；There is a shielding construction behind the detection device.
2. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the sample introduction system
System include: the sample introduction head cooperated with the input mode of ion source positioned at front end, screw hole for connecting inlet or outlet channel,
Guarantee the o-ring groove of air-tightness for accommodating sealing ring.
3. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the inner sleeve
There is an air-tightness interface connecting with sampling system in front end, inner sleeve tube rear end have with detection device realize groove that air-tightness connect and
Fixed screw hole, the inner sleeve outer diameter and the migration ring inner diameter seal cooperate.
4. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the dead ring
Substrate is printed circuit board, and the printed circuit board surface copper facing forms electrode, to form migration ring.
5. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the detection dress
Setting substrate is printed circuit board, and copper facing is connected as the Faraday plate for detecting electric signal by copper facing on printed circuit board
It connects sub-miniature A connector to extract the signal of Faraday plate, the electricity that connection migration pipe end migrates ring is set on printed circuit board
Appearance and electric resistance structure.
6. working in the ion mobility spectrometry apparatus of low air pressure condition as claimed in claim 3, it is characterised in that: after shielding construction
There is a stomata in face；Gas flow by adjusting air inlet and air outlet can make needed for obtaining inside ion mobility spectrometry
Pressure.
7. working in the ion mobility spectrometry apparatus of low air pressure condition as claimed in claim 4, it is characterised in that: the migration ring
It is upper that controllable DC voltage is loaded by divider resistance, and from one end of the insulating sleeve to the other end, on each migration ring
Added DC voltage monotone decreasing is incremented by.
8. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: further include gas
Pump, to control to adjust and the air pressure inside holding meanss.
9. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the sample introduction system
System uses capillary sample inlet, can prevent sample introduction from having an impact to the air pressure inside ion mobility spectrometry apparatus.
10. working in the ion mobility spectrometry apparatus of low air pressure condition as claimed in claim 7, it is characterised in that: the partial pressure
Resistance be etc. resistance values divider resistance, be separately positioned on each conducting ring.
11. working in the ion mobility spectrometry apparatus of low air pressure condition as described in claim 1, it is characterised in that: the ion
An airtightness ion gate also can be set in migration spectral apparatus, for controlling ion motion and keeping airtight inside migration tube
Property；By applying potential difference between the wire that two groups of alternating parallels arrange, to be formed perpendicular to the original direction of motion of ion
Deflection or block electric field, can deflect ion motion trace or block ion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558724.6A CN108956750B (en) | 2018-06-01 | 2018-06-01 | Ion mobility spectrometry device working under low-pressure condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558724.6A CN108956750B (en) | 2018-06-01 | 2018-06-01 | Ion mobility spectrometry device working under low-pressure condition |
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| Publication Number | Publication Date |
|---|---|
| CN108956750A true CN108956750A (en) | 2018-12-07 |
| CN108956750B CN108956750B (en) | 2021-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810558724.6A Active CN108956750B (en) | 2018-06-01 | 2018-06-01 | Ion mobility spectrometry device working under low-pressure condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112735937A (en) * | 2020-12-10 | 2021-04-30 | 中国科学院大连化学物理研究所 | PCB board Faraday signal receiving disc device |
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| CN112735937B (en) * | 2020-12-10 | 2022-03-01 | 中国科学院大连化学物理研究所 | PCB board Faraday signal receiving disc device |
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| CN108956750B (en) | 2021-07-27 |
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