CN108091538B - Integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer - Google Patents
Integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer Download PDFInfo
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- CN108091538B CN108091538B CN201611041188.XA CN201611041188A CN108091538B CN 108091538 B CN108091538 B CN 108091538B CN 201611041188 A CN201611041188 A CN 201611041188A CN 108091538 B CN108091538 B CN 108091538B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
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- G—PHYSICS
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- 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
- G01N27/622—Ion mobility spectrometry
- G01N27/624—Differential mobility spectrometry [DMS]; Field asymmetric-waveform ion mobility spectrometry [FAIMS]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
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Abstract
The invention discloses an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer, which comprises a differential ion mobility spectrum, an ultraviolet lamp ionization source and a fixed groove.
Description
Technical Field
The invention relates to a differential ion mobility spectrometry technology, in particular to an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer.
Background
Differential ion mobility spectrometry is used for ion separation by using the difference of ion mobility under high and low fields. The sample is carried into the ionization region by the carrier gas and the ionized sample ions then enter the mobility region. The migration zone is generally two parallel plates. One of the flat plates is added with a radio frequency electric field with asymmetric waveform, and the other is grounded. In the migration zone, ions can make up-and-down oscillation movement in the direction vertical to the direction of the carrier gas under the action of a high-frequency electric field. Because the mobility of ions in high and low fields is different, the ions can generate a displacement in the vertical direction in each period of the high-frequency electric field, and finally the ions hit the polar plate and are annihilated. If a matched compensation voltage is applied to the high-frequency electric field, the displacement of the ions in the y direction under the asymmetric field is counteracted, so that the ions can pass through the drift region and reach the detection electrode. By scanning the compensation voltage within a certain range, different sample ions can reach the detection electrode through the migration region under a specific compensation voltage, and the detection of the sample is realized. The purpose of selectively detecting the sample is achieved by applying a specific compensation voltage.
A certain distance is left between the two parallel plates, and if air is to be fed from one end of the structure consisting of the two parallel plates and air is to be discharged from the other end of the structure, the peripheries of the two parallel plates except the air inlet and the air outlet need to be well sealed.
The invention relates to an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer, which aims to solve the sealing problem of a differential ion mobility spectrometer by horizontally feeding all carrier gas between two parallel migration polar plates of the differential ion mobility spectrometer into the migration polar plates through a gas inlet and completely discharging all gas through a horizontal gas outlet, so that the differential ion mobility spectrometer keeps stable gas flow and ensures the detection reliability.
Disclosure of Invention
An integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer comprises an upper polar plate (7) and a lower polar plate (8) of a differential ion mobility spectrum migration polar plate, wherein the flat upper polar plate (7) and the flat lower polar plate (8) are arranged in parallel and oppositely, and a migration area and a detection area are formed between the upper polar plate and the lower polar plate through a separation electrode and a receiving electrode which are arranged on the migration polar plate;
the front end and the rear end of the transfer polar plate are respectively provided with a gas inlet end part (2) and a gas outlet end part (9), and the front end gas inlet end part (2) and the rear end gas outlet end part (9) are respectively hermetically connected with the front wall surface and the rear wall surface of the transfer polar plate;
the differential ion mobility spectrometry fixing groove (11) sequentially contains an air inlet end part (2), a differential ion mobility spectrometry mobility polar plate and a rear end air outlet end part (9) from left to right;
the air inlet end part (2) consists of an integrated hollow closed cavity with threads on the left side and a groove for placing the ultraviolet lamp ionization source (4) on the right side, a through hole is formed in the wall surface of one side of the left closed container and communicated with the lower part of the groove for placing the ultraviolet lamp ionization source (4) on the right side, one end of the front side of the migration polar plate is tightly connected with the air inlet end part (2) through an O-shaped sealing ring, and the through hole of the air inlet end part (2) is communicated with a channel formed between the upper polar plate (7) and the lower polar plate (8); a sample gas inlet is arranged on the left side wall of the gas inlet end part (2).
The ultraviolet lamp ionization source (4) is tightly connected with the air inlet end part (2) through an ionization source fixing frame (5), an ionization source fixing pressing cap (6) and an O-shaped sealing ring;
the air outlet end part (9) is a hollow closed container, a through hole is arranged on one side wall surface of the closed container, and one end of the rear side of the channel of the migration polar plate is tightly connected with the inner wall surface of the through hole through an O-shaped sealing ring; a sample gas outlet is arranged on the side wall of the right side of the gas outlet end part (9).
Four screw holes are arranged below the air outlet end part (9) and used for fixing the air outlet end part (9).
Holes (13) corresponding to four screw holes below the gas outlet end part (9) are formed in the gas outlet end part fixing holes (10) of the differential ion mobility spectrometry fixing groove (11). Screws penetrate through the air outlet end part fixing holes (10) and are screwed into the four screw holes below the air outlet end part (9) respectively, and the air outlet end part (9) and the differential ion mobility spectrometry fixing groove (11) are tightly fixed.
The one end that fixed recess of difference ion mobility spectrometry (11) was placed inlet end spare (2) is opened has two jackscrew screw holes, place inlet end spare (2) in proper order in fixed recess of difference ion mobility spectrometry (11), last polar plate (7) and bottom plate (8) of ion mobility spectrometry migration polar plate, outlet end spare (9), later with the tight inlet end spare (2) of jackscrew top, level compresses tightly sealed inlet end spare (2) in proper order, last polar plate (7) and bottom plate (8) of ion mobility spectrometry migration polar plate, outlet end spare (9).
The invention has the advantages that:
the invention relates to an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer, which aims to solve the sealing problem of a differential ion mobility spectrometer by horizontally feeding all carrier gas between two parallel migration polar plates of the differential ion mobility spectrometer into the migration polar plates through a gas inlet and completely discharging all gas through a horizontal gas outlet, so that the differential ion mobility spectrometer keeps stable gas flow and ensures the detection reliability.
Drawings
FIG. 1 is a schematic plan view of an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer.
Fig. 2 is a bottom view of an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer with the upper cover removed.
Fig. 3 is a top view of an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer.
Fig. 4 is a bottom view of an integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer.
FIG. 5 shows the acetone test spectrum obtained by the ionization source differential ion mobility spectrometer of the integrated vacuum ultraviolet lamp.
Wherein: the chamber is placed to 1 heating rod, 2 inlet end parts, 3 fixed flat boards of upside, 4 ultraviolet lamp ionization sources, 5 ionization source mount, 6 fixed pressure caps in ionization source, 7 last polar plate of difference formula ion mobility spectrometry migration polar plate, 8 lower polar plate of difference formula ion mobility spectrometry migration polar plate, 9 outlet end parts, 10 outlet end part fixed recess, 11 difference ion mobility spectrometry fixed recess, 12 inlet end part fixed orificess, 13 outlet end part fixed orifices, 14 fixed dull and stereotyped jackscrew hole of upside, 15 first walk the line hole on the fixed recess lateral wall, 16 second walk the line hole on the fixed recess lateral wall.
Detailed Description
An integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer comprises an upper polar plate (7) and a lower polar plate (8) of a differential ion mobility spectrum migration polar plate, wherein the flat upper polar plate (7) and the flat lower polar plate (8) are arranged in parallel and oppositely, and a migration area and a detection area are formed between the upper polar plate and the lower polar plate through a separation electrode and a receiving electrode which are arranged on the migration polar plate;
the front end and the rear end of the transfer polar plate are respectively provided with a gas inlet end part (2) and a gas outlet end part (9), and the front end gas inlet end part (2) and the rear end gas outlet end part (9) are respectively hermetically connected with the front wall surface and the rear wall surface of the transfer polar plate;
the differential ion mobility spectrometry fixing groove (11) sequentially contains an air inlet end part (2), a differential ion mobility spectrometry mobility polar plate and a rear end air outlet end part (9) from left to right;
the air inlet end part (2) consists of an integrated hollow closed cavity with threads on the left side and a groove for placing the ultraviolet lamp ionization source (4) on the right side, a through hole is formed in the wall surface of one side of the left closed container and communicated with the lower part of the groove for placing the ultraviolet lamp ionization source (4) on the right side, one end of the front side of the migration polar plate is tightly connected with the air inlet end part (2) through an O-shaped sealing ring, and the through hole of the air inlet end part (2) is communicated with a channel formed between the upper polar plate (7) and the lower polar plate (8); a sample gas inlet is arranged on the left side wall of the gas inlet end part (2).
The ultraviolet lamp ionization source (4) is tightly connected with the air inlet end part (2) through an ionization source fixing frame (5), an ionization source fixing pressing cap (6) and an O-shaped sealing ring;
the air outlet end part (9) is a hollow closed container, a through hole is arranged on one side wall surface of the closed container, and one end of the rear side of the channel of the migration polar plate is tightly connected with the inner wall surface of the through hole through an O-shaped sealing ring; a sample gas outlet is arranged on the side wall of the right side of the gas outlet end part (9).
Four screw holes are arranged below the air outlet end part (9) and used for fixing the air outlet end part (9).
Holes (13) corresponding to four screw holes below the gas outlet end part (9) are formed in the gas outlet end part fixing holes (10) of the differential ion mobility spectrometry fixing groove (11). Screws penetrate through the air outlet end part fixing holes (10) and are screwed into the four screw holes below the air outlet end part (9) respectively, and the air outlet end part (9) and the differential ion mobility spectrometry fixing groove (11) are tightly fixed.
The one end that fixed recess of difference ion mobility spectrometry (11) was placed inlet end spare (2) is opened has two jackscrew screw holes, place inlet end spare (2) in proper order in fixed recess of difference ion mobility spectrometry (11), last polar plate (7) and bottom plate (8) of ion mobility spectrometry migration polar plate, outlet end spare (9), later with the tight inlet end spare (2) of jackscrew top, level compresses tightly sealed inlet end spare (2) in proper order, last polar plate (7) and bottom plate (8) of ion mobility spectrometry migration polar plate, outlet end spare (9).
Four screw holes are arranged below the air inlet end part (2), and corresponding holes (12) are arranged at the positions of the corresponding differential ion mobility spectrometry fixing grooves (11). The air inlet end part (2) and the differential ion mobility spectrometry fixing groove (11) are tightly fixed by four screws.
Four jackscrew holes (9) are formed right above an upper polar plate (7) and a lower polar plate (8) of the ion mobility spectrum migration polar plate of the upper side fixing flat plate (3), and the upper polar plate (7) and the lower polar plate (8) of the ion mobility spectrum migration polar plate are horizontally pressed by using jackscrews.
The wiring of the separation electrode passes through a first wiring hole (15) and a second wiring hole (16) which are arranged on the side wall of the differential ion mobility spectrometry fixing groove (11) and is connected with an external radio frequency power supply; the positive and negative detection end lines of the receiving electrode are respectively connected with an external signal amplifying device through two signal output wiring holes arranged at one end of the differential ion mobility spectrometry fixing groove (11) contacted with the air outlet end part (9) and lead out signal lines.
The differential ion mobility spectrometry carrier gas carries a sample to enter a cavity below an ultraviolet lamp ionization source (4) through a gas inlet on a gas inlet end part (2), and the sample is ionized; the ionized sample sequentially passes through a migration area and a detection area formed between an upper polar plate (1) and a lower polar plate (2) which are placed in parallel, the sample is separated in the migration area, the detection of the sample is realized in the detection area, the carrier gas is discharged from a gas outlet of a differential ion mobility spectrometry arranged on a gas outlet end part (9), and the detection purpose of the sample is finally achieved.
When the carrier gas flow of the carrier acetone gas entering from the gas inlet of the differential ion mobility spectrometry is 800ml/min, the gas flow of the gas outlet is basically 800ml/min, and the acetone signal of 10bbp is detected by the high-integration differential ion mobility spectrometry mobility polar plate.
Claims (10)
1. An integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer is characterized in that:
comprises a differential ion mobility spectrum, an ultraviolet lamp ionization source and a fixing groove (11), wherein the fixing groove (11) is a container with an opening at the upper end;
a gas inlet end part (2) and a gas outlet end part (9) are respectively arranged at the gas inlet and the gas outlet of the differential ion mobility spectrometry;
the air inlet end part (2), the differential ion mobility spectrum migration polar plate and the rear end air outlet end part (9) are sequentially placed in the fixed groove (11) from left to right;
the air inlet end part (2) is a block, the left side of the block is provided with a hollow closed cavity, the right side of the block is provided with a groove for placing an ultraviolet lamp ionization source (4), the right side wall surface of the hollow closed cavity at the left side is provided with a through hole which is communicated with the lower part of the groove for placing the ultraviolet lamp ionization source (4), the air inlet end part (2) is tightly connected with an air inlet of a differential ion mobility spectrometry through an O-shaped sealing ring, and the through hole of the air inlet end part (2) is communicated with a channel formed between an upper polar plate (7) and a lower polar plate (8); a light outlet of the ultraviolet lamp ionization source (4) faces the bottom of the groove and is arranged in the groove, a gap is reserved between the ultraviolet lamp ionization source (4) and the bottom of the groove, the ultraviolet lamp ionization source (4) is hermetically connected with the opening end of the groove, and the groove is sealed;
a through hole which is used as a sample gas inlet is arranged on the left side wall of the hollow closed cavity of the gas inlet end part (2);
the air outlet end part (9) is a hollow closed container, through holes are respectively arranged on the left side wall surface and the right side wall surface of the closed container, the left side through hole is hermetically communicated with an air outlet of the differential ion mobility spectrometry through an O-shaped sealing ring, and the right side through hole is used as an air outlet of sample air;
through holes corresponding to the sample gas inlet and the sample gas outlet are respectively arranged on the left side wall surface and the right side wall surface of the fixed groove (11).
2. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
ionization source mount (5) are lower extreme opening, the inclosed container in upper end, ionization source mount (5) are arranged in to ultraviolet lamp ionization source (4), ionization source mount (5) outside is equipped with annular boss, ionization source fixed pressure cap (6) cover that the middle part band-pass hole was located ionization source mount (5) outside annular boss top, ionization source fixed pressure cap (6) are screwed with the protruding external screw thread of annular on the recess of ultraviolet lamp ionization source (4) through the internal thread on it, and be equipped with O type sealing washer between ionization source fixed pressure cap (6) and annular are protruding, ultraviolet lamp ionization source (4) are through ionization source mount (5), ionization source fixed pressure cap (6), O type sealing washer and inlet end spare (2) closely link to each other.
3. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein: the differential ion mobility spectrometry comprises an upper polar plate (7) and a lower polar plate (8) of a migration polar plate, wherein the flat upper polar plate (7) and the flat lower polar plate (8) are arranged in parallel and oppositely, and a migration area and a detection area are formed between the upper polar plate and the lower polar plate through a separation electrode and a receiving electrode arranged on the migration polar plate; the air inlet and the air outlet of the differential ion mobility spectrometry are respectively positioned at the left end and the right end of the migration polar plate, namely the air inlet is positioned at the left end of the migration zone far away from the detection zone, and the air outlet is positioned at the right end of the detection zone far away from the migration zone.
4. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
a heating rod fixing cavity (1) is arranged at the bottom of the fixing groove (11), and an electric heating rod is arranged in the heating rod fixing cavity;
the through holes at the left and right sides of the air outlet end part (9) and the through holes at the left and right sides of the hollow closed cavity of the air inlet end part (2) are communicated with a channel formed between the upper polar plate (7) and the lower polar plate (8).
5. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
four screw holes are arranged below the air outlet end part (9) and used for fixing the air outlet end part (9);
a fixing hole (10) is formed in the position of the air outlet end part at the lower part of the fixing groove (11), and holes (13) corresponding to four screw holes below the air outlet end part (9) are formed in the fixing hole (10); screws penetrate through the air outlet end part fixing holes (10) and are screwed into the four screw holes below the air outlet end part (9) respectively, and the air outlet end part (9) and the differential ion mobility spectrometry fixing groove (11) are tightly fixed.
6. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
the air inlet end part (2), the upper pole plate (7) and the lower pole plate (8) of the ion mobility spectrometry migration pole plate and the air outlet end part (9) are sequentially placed in the fixing groove (11), then the air inlet end part (2) is tightly jacked by the jackscrew, and the air inlet end part (2), the upper pole plate (7) and the lower pole plate (8) of the ion mobility spectrometry migration pole plate and the air outlet end part (9) are sequentially and horizontally compressed and sealed.
7. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
four screw holes are arranged below the air inlet end part (2), and corresponding holes (12) are arranged at corresponding parts of the corresponding fixing grooves (11); the air inlet end part (2) and the differential ion mobility spectrometry fixing groove (11) are tightly fixed by four screws.
8. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
a fixed flat plate (3) fixedly connected with the fixed groove (11) is arranged at the opening end of the fixed groove (11), four jackscrew holes (14) are formed in the fixed flat plate (3) right above the ion mobility spectrometry, and an upper polar plate (7) and a lower polar plate (8) of the ion mobility spectrometry are horizontally pressed by using jackscrews.
9. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 3, wherein:
the wiring of the separation electrode passes through a first wiring hole (15) and a second wiring hole (16) which are arranged on the side wall of the differential ion mobility spectrometry fixing groove (11) and is connected with an external radio frequency power supply; the positive and negative detection end lines of the receiving electrode are respectively connected with an external signal amplifying device through two signal output wiring holes arranged at one end of the differential ion mobility spectrometry fixing groove (11) contacted with the air outlet end part (9) and lead out signal lines.
10. The integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer of claim 1, wherein:
the differential ion mobility spectrometry carrier gas carries a sample to enter a cavity below an ultraviolet lamp ionization source (4) through a gas inlet on a gas inlet end part (2), and the sample is ionized; the ionized sample sequentially passes through a migration zone and a detection zone formed between an upper polar plate (7) and a lower polar plate (8) which are arranged in parallel, the sample is separated in the migration zone, the detection of the sample is realized in the detection zone, the carrier gas is discharged from a gas outlet of a differential ion mobility spectrometry arranged on a gas outlet end part (9), and the detection purpose of the sample is finally achieved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611041188.XA CN108091538B (en) | 2016-11-23 | 2016-11-23 | Integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer |
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| CN201611041188.XA CN108091538B (en) | 2016-11-23 | 2016-11-23 | Integrated vacuum ultraviolet lamp ionization source differential ion mobility spectrometer |
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| CN108091538B true CN108091538B (en) | 2020-01-14 |
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| CN109841481A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | A kind of integrated form vacuum UV lamp ionization source difference ionic migration spectrometer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176403A (en) * | 2010-12-31 | 2011-09-07 | 清华大学 | Ionic focusing method for high-field asymmetric waveform ion mobility spectrometer with flat plate structure |
| CN102479663A (en) * | 2010-11-30 | 2012-05-30 | 中国科学院大连化学物理研究所 | Ion mobility tube and applications thereof |
| CN103871828A (en) * | 2012-12-17 | 2014-06-18 | 中国科学院大连化学物理研究所 | Array type photoelectric transmission ionizing source and application thereof |
| CN204289366U (en) * | 2014-11-03 | 2015-04-22 | 中国科学院大连化学物理研究所 | A kind of type ion mobility spectrometry instrument |
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- 2016-11-23 CN CN201611041188.XA patent/CN108091538B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102479663A (en) * | 2010-11-30 | 2012-05-30 | 中国科学院大连化学物理研究所 | Ion mobility tube and applications thereof |
| CN102176403A (en) * | 2010-12-31 | 2011-09-07 | 清华大学 | Ionic focusing method for high-field asymmetric waveform ion mobility spectrometer with flat plate structure |
| CN103871828A (en) * | 2012-12-17 | 2014-06-18 | 中国科学院大连化学物理研究所 | Array type photoelectric transmission ionizing source and application thereof |
| CN204289366U (en) * | 2014-11-03 | 2015-04-22 | 中国科学院大连化学物理研究所 | A kind of type ion mobility spectrometry instrument |
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