CN103400742B - Integral type ion mobility spectrometry drift tube - Google Patents
Integral type ion mobility spectrometry drift tube Download PDFInfo
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- CN103400742B CN103400742B CN201310306275.3A CN201310306275A CN103400742B CN 103400742 B CN103400742 B CN 103400742B CN 201310306275 A CN201310306275 A CN 201310306275A CN 103400742 B CN103400742 B CN 103400742B
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Abstract
The present invention discloses a kind of integral type ion mobility spectrometry drift tube, increases an insulation inner casing and a shell outward at conventional Drift pipe, and insulation inner casing is nested in drift tube shell.Ionization chamber, ion gate component, division module group, hole grid, charge-trapping pole and rail unit are all installed in insulation inner casing.Metal shell and insulation inner casing are furnished with fairlead and gas port, are respectively used to the inlet, outlet of the signal of telecommunication and inside and outside circulation gas circuit.This drift tube compares with conventional Drift pipe, reduces volume, improves air-tightness and antijamming capability, especially under hot conditions, efficiently solves a degradation difficult problem under the drift tube air-tightness caused because of material temperature deformation.
Description
Technical field
Invention relates to a kind of drift tube, is specifically related to a kind of integral type ion mobility spectrometry drift tube.
Background technology
Ion mobility spectrometry (IMS) is a kind of gas phase analysis technology, is to carry out effectively one of important method of sensitive analysis to Trace Organic Compounds.The core component of ion mobility spectrometry is drift tube, and as shown in Figure 1, by conducting ring with dead ring is stacked forms, uniform three mounting-positioning holes on conducting ring and dead ring, thoroughly do away with edge concentric column by three and be connected in series, play fixing and concentric effect the structure of conventional Drift pipe.The permeable membrane element that permeable membrane and film heater are formed is arranged on the front end of drift tube, and permeable membrane front end is outer circulation gas circuit (comprising air inlet and gas outlet), for sample collection.In ionization chamber, next-door neighbour's permeable membrane element puts radioactive source paillon foil, for completing the ionization of air molecule, and forming reactions ion.Forming reactions district between ionization chamber and ion gate, mainly completes between sample molecule and electronics or reactive ion and ion reaction occurs, generate product ion.Ion gate is made up of two panels metal grid mesh and intermediate insulation sheet, by controlling ion gate, makes it open by period distances, forms ion pulse, enters the drift region at ion gate rear portion.Drift region afterbody is hole grid and passive electrode, passive electrode afterbody connection signal amplifier.
The operation principle of drift tube is: apply the high pressure of about 2000V at drift tube two ends, by the dividing potential drop of the additional partial-pressure circuit board of reaction zone and drift region, in reaction zone and drift region, forms uniform electric field.Measured matter enters drift tube with sample gas (air) through air inlet, discharges through gas outlet.Measured matter in sample gas is adsorbed by permeable membrane, and permeable membrane is made up of silicon rubber, and conventional thickness is 5 μm ~ 30 μm, the permeable organic molecule of this kind of film and keep water vapour here.Heating permeable membrane to 100 DEG C, measured matter is resolved.Carrier gas (purifying air or pure nitrogen gas) enters from carrier gas air inlet, carries measured matter and enters ionization chamber, is ionized indoor ionization source and (is generally
63ni radioactive source) ionization, form product ion.Product ion, under the effect of reaction zone electric field, shifts to ion gate, and sentences certain concentration gathering at ion gate.Ion gate opens 0.3ms every 30ms, makes product ion enter drift region with impulse form.Under the effect of drift field, shift to passive electrode.Hole grid are positioned at before passive electrode, and Main Function reduces interference.The product ion size generated due to different types of measured matter, quality are different with institute electrically charged quantity, its migration velocity in drift region is different, different through the drift time needed for drift region, namely the time arriving passive electrode is different, thus the spectrogram of generation current signal and time relationship, identify the spectrum peak that different measured matter produces, determine the kind of measured matter.
The drift tube of traditional stepped construction needs to be tightened by four screw rods, to ensure the sealing between ring and ring; Meanwhile, the tightness of four screw rods wants consistent, to ensure the proper alignment of drift tube inner chamber.But after heating, cool, heat etc. and working long hours, because metal material is different with the thermal deformation of nonmetallic materials, cause the air-tightness of drift tube and concentric hydraulic performance decline.Meanwhile, after drift tube installs film heating sheet outward, easily interference is produced to pipe internal electric field, cause spectrum signal unstable, reduce the detectivity of instrument.
Summary of the invention
In view of this, the invention provides a kind of integral type ion mobility spectrometry drift tube, solve the problem that the drift tube air-tightness that causes because of material deformation under the high temperature conditions declines, effectively can overcome existing drift tube poor air-tightness and the low drawback of antijamming capability, spectrum signal in pipe is stablized, and detectivity is high.
This integral type ion mobility spectrometry drift tube comprises shell, insulation inner casing, permeable membrane element, ionization chamber, ion gate component, more than one division module, hole grid, charge-trapping pole and rail unit.
Its housing is the tubular construction of metal material, and the outer circumference surface of its one end is processed with the shaft shoulder, its inner peripheral surface is processed with radial annular protrusion.Described insulation inner casing is the tubular construction of high-temperature insulation material, and insulation inner casing is coaxially nested in enclosure, and with the inner peripheral surface interference fit of shell.Insulation one end of inner casing and the annular protrusion of enclosure are conflicted.Described permeable membrane element is arranged on the end of enclosure axis point of shoulder, and the front end of permeable membrane element arranges sample gas air inlet and sample gas gas outlet.
Described ionization chamber, ion gate component, more than one division module and hole grid are coaxially arranged on insulation inner housing inner successively, and all with insulation inner casing inner peripheral surface interference fit.Wherein conflicted by the annular protrusion of ceramic ring and enclosure in one end of ionization chamber.All isolated by ceramic ring between described ion gate component and division module, between hole grid and division module.Described division module comprises two conducting rings, dead ring and dividing potential drop high resistant.The outer circumference surface of described dead ring is processed with the rectangular channel for installing dividing potential drop high resistant.Two conducting rings fit tightly the two ends, left and right at dead ring respectively, and two conducting rings are connected with the two ends of dividing potential drop high resistant respectively.The outer rim of two conducting rings all inwardly bending simultaneously, makes dead ring be nested between two conducting rings.Described hole grid are positioned on rear side of division module, and and are isolated by ceramic ring between division module.
Described charge-trapping pole is positioned on rear side of the grid of hole, and charge-trapping pole comprises electrode and lead-in wire, and wherein electrode is the convex dish structure of stainless steel, and its face relative with hole grid is convex surface.Described lead-in wire stretches out shell.Described rail unit comprises afterbody cover, Compress Spring and pressure head, and wherein afterbody cover coaxial package is outside at lead-in wire, and isolated by ceramic ring between afterbody cover and hole grid, afterbody cover is isolated by insulating case and lead-in wire simultaneously, and and installs sealing ring between lead-in wire.At afterbody cover excircle suit Compress Spring, the shaft shoulder that one end of described Compress Spring and afterbody overlap is conflicted, the other end and be arranged on the pressure head that afterbody overlaps excircle and conflict, described pressure head and shell affixed.
Described shell is provided with gate control signal fairlead, drift region voltage of electric field fairlead, hole gate voltage fairlead and ground signalling fairlead after gate control signal fairlead before high-voltage connection hole, ion gate, ion gate.And carrier gas air inlet, drift gas air inlet and Inner eycle gas outlet.
Described permeable membrane element comprises permeable membrane, permeable membrane skeleton and film heating plate, and permeable membrane and film heating plate are directly installed on permeable membrane skeleton.
Described ionization chamber comprises metal sleeve and the radioactive source paillon foil of the equal opening in two ends.Described metal sleeve is coaxially nested in insulation inner casing, and is conflicted by the annular protrusion of ceramic ring and enclosure.The inner peripheral surface of metal sleeve installs radioactive source paillon foil, and described radioactive source paillon foil is located by the shaft shoulder of metal sleeve inner peripheral surface.
Described radioactive source paillon foil is 10mCi's
63ni-radiator beta-ray.
Described ion gate component comprises ceramics seat, Qianmen conducting ring, Qianmen, insulating trip, back door and back door conducting ring.Metal sleeve in one end of described ceramics seat and ionization chamber is conflicted, and the ceramic ring of the other end and division module front end is conflicted.Qianmen conducting ring, Qianmen, insulating trip, back door, back door conducting ring are arranged on the limited post of ceramics seat inner peripheral surface successively by respective stopper slot.
Described Qianmen conducting ring and back door conducting ring are the brass material of electric conductive oxidation process, and Qianmen and back door are stainless steel laser corrosion silk screen, and insulating trip is polytetrafluoro material.
Dividing potential drop high resistant in described division module is the Chip-R of 1M ' Ω.
Described hole grid are stainless steel laser corrosion silk screen.
Beneficial effect:
(1) drift tube is made to form integral structure by external conductive casing and insulation inner casing, compare with conventional Drift pipe, reduce volume, efficiently solve existing drift tube poor air-tightness and the low drawback of antijamming capability under the high temperature conditions, in pipe, spectrum signal is stablized, and detectivity is high.
(2) division module group is installed in drift region and realizes dividing potential drop, additional bleeder circuit plate can be avoided, make whole apparatus structure simple.
(3) in permeable membrane element, film heating plate and permeable membrane are installed on permeable membrane skeleton, have abandoned the mode of installing separately film heater in tradition, make whole apparatus structure simple, easy for installation.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional ion migration drift tube;
The overall structure schematic diagram of Fig. 2 integral type Ion transfer of the present invention drift tube;
Fig. 3 is the structural representation of drift tube shell in the present embodiment;
Fig. 4 is the structural representation of inner casing of insulating in the present embodiment;
Fig. 5 is the structural representation after ion gate component is amplified;
Fig. 6 is the structural representation of division module.
Wherein: 1-permeable membrane element, 2-sample gas air inlet, 3-sample gas gas outlet, 5-ionization chamber, 6-metal sleeve, 7-insulate inner casing, 8-shell, 9-ion gate component, 10-division module, 11-hole grid, 12-charge-trapping pole, 13-Compress Spring, 14-pressure head, 15-afterbody cover, 16-ceramics seat, 17-Qianmen conducting ring, 18-Qianmen, 19-insulating trip, 20-back door, 21-back door conducting ring, 22-conducting ring, 23-dead ring, 24-high-voltage connection hole, gate control signal fairlead before 25-ion gate, gate control signal fairlead after 26-ion gate, 27-drift region voltage of electric field fairlead, 28-hole gate voltage fairlead, 29-ground signalling fairlead, 30-carrier gas air inlet, 31-drift gas air inlet, 32-Inner eycle gas outlet
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The present embodiment provides a kind of integral type ion mobility spectrometry drift tube, compares, reduce volume with conventional Drift pipe, improves air-tightness and antijamming capability, effectively solves under the high temperature conditions, because of the problem of the drift tube air-tightness decline that material deformation causes.
The structure of this integral type Ion transfer drift tube as shown in Figure 2, comprises shell 8, insulation inner casing 7, permeable membrane element 1, ionization chamber 5, ion gate component 9, division module 10, hole grid 11, charge-trapping pole 12 and rail unit.
The present embodiment housing 8 is external diameter 20mm, internal diameter 18mm, and the stainless steel tube of 1mm after wall, the outer circumference surface of its one end is processed with the shaft shoulder, and on the inner peripheral surface of shaft shoulder side, is processed with radial annular protrusion at it, as shown in Figure 3.The external diameter 18mm that insulation inner casing 7 is made for ceramic material, internal diameter 15mm, the tubular structure of 1.5mm after wall, as shown in Figure 4.Shell 8 is the outermost layer parts of drift tube, and insulation inner casing 7 is coaxially nested in enclosure 8, electrification insulating effect, and the annular protrusion on insulation one end of inner casing 7 and shell 8 inner peripheral surface is conflicted.
The shaft shoulder place end of shell 8 is the head of drift tube, and permeable membrane element 1 is arranged on the end of shell 8 shaft shoulder end, is convenient to disassembly, cleaning and replacing.Permeable membrane element 1 comprises permeable membrane, permeable membrane skeleton and film heating plate, and permeable membrane and film heating plate are directly installed on permeable membrane skeleton.The front end of permeable membrane element 1 arranges outer circulation gas circuit, comprises sample gas air inlet 2 and sample gas gas outlet 3.It is inner that ionization chamber 5, ion gate component 9, division module 10 and hole grid 11 are arranged on insulation inner casing 7 successively.Wherein ionization chamber 5 comprises metal sleeve 6 and the radioactive source paillon foil of the equal opening in two ends, metal sleeve 6 is coaxially nested in insulation inner casing 7, with the inner peripheral surface interference fit of insulation inner casing 7, conflicted by the annular protrusion of ceramic ring and shell 8 inside in one end of metal sleeve 6.The endoporus of metal sleeve 6 is shoulder hole, places radioactive source paillon foil, and prevented the axial endplay of radioactive source paillon foil by the shaft shoulder on ladder endoporus at its inner peripheral surface near side, permeable membrane element 1 place.In the present embodiment, radioactive source paillon foil selects 10mCi's
63ni-radiator beta-ray.
Ion gate component 9 is positioned on rear side of ionization chamber 5, and the region between ionization chamber 5 and ion gate component 9 is reaction zone.Ion gate component 9 is made up of ceramics seat 16, Qianmen conducting ring 17, Qianmen 18, insulating trip 19, back door 20 and back door conducting ring 21.Wherein the brass material of electric conductive oxidation process selected by Qianmen conducting ring and back door conducting ring, and Qianmen and back door select stainless steel laser to corrode silk screen, and insulating trip selects polytetrafluoro material.It is inner that ceramics seat 16 is coaxially nested in insulation inner casing 7, with the inner peripheral surface interference fit of insulation inner casing 7, metal sleeve 6 in the end of ceramics seat 16 and ionization chamber 5 is conflicted, Qianmen conducting ring, Qianmen, insulating trip, back door conducting ring, back door are arranged on the limited post of ceramics seat inner peripheral surface successively by respective stopper slot, ensure that its installation accurately puts in place.
Division module 10 is positioned on rear side of ion gate component 9, and the length according to required drift tube selects the group number of division module 10.Be nested in insulation inner casing 7 after the coaxial close-packed arrays of more than one division module 10 inner, and and isolated by ceramic insulation ring between ion gate component 9.Each division module 10 comprises two conducting rings, 22, dead ring 23 and dividing potential drop high resistant, as shown in Figure 6.In the present embodiment, conducting ring 22 is stainless steel, its external diameter 15.3mm, internal diameter 10mm, thick 0.1mm; Dead ring 23 selects resistant to elevated temperatures processable ceramic material, external diameter 15mm, internal diameter 10mm.The periphery of dead ring 23 is processed with dark 1.2mm, the rectangular recess of long 8mm, for placing dividing potential drop high resistant, in the present embodiment, dividing potential drop high resistant selects the Chip-R of 1M ' Ω.Two conducting rings 22 are coaxial and fit snugly in the left and right both ends of the surface of dead ring 23, ensure that two conducting rings 22 are connected with the two ends of Chip-R on dead ring 23 respectively; Then by inside for the outer rim of two conducting rings 22 bending 1.5mm, dead ring 23 is closely nested between two conducting rings 22.
Hole grid 11 are positioned on rear side of division module 10, and and are isolated by ceramic insulation ring between division module 10.The present embodiment mesopore grid 11 select stainless steel laser to corrode silk screen.
Charge-trapping pole 12 is positioned on rear side of hole grid 11, and its coaxial package in the enclosure.Charge-trapping pole 12 comprises electrode and lead-in wire, isolates between charge-trapping pole 12 and hole grid 11 by being arranged on the ceramic insulation ring insulated in inner casing 7.Wherein electrode is the convex dish structure of stainless steel, and its face relative with hole grid is convex surface, and lead-in wire stretches out shell 8.
Rail unit is used for compression and the sealing of each assembly in drift tube.Rail unit comprises afterbody cover 15, Compress Spring 13 and pressure head 14, and wherein afterbody overlaps 15 coaxial packages outside lead-in wire, interference fit between the inner peripheral surface of its outer circumference surface and shell 8, between afterbody cover 15 and lead-in wire, install sealing ring.Afterbody cover 15 is isolated by dead ring and hole grid 11, is isolated by insulating case and lead-in wire.At the excircle suit Compress Spring 13 of afterbody cover 15, the shaft shoulder that one end of Compress Spring 13 and afterbody overlap 15 is conflicted, the other end and be arranged on the pressure head 14 that afterbody overlaps 15 excircles and conflict, and pressure head 14 is fixedly connected with shell.The axial location of each assembly in drift tube is ensured by the axial restoring force of Compress Spring 13.
Shell 8 is provided with six fairleads and three gas ports simultaneously.Wherein five fairleads are respectively gate control signal fairlead 26, drift region voltage of electric field fairlead 27, hole gate voltage fairlead 28 and ground signalling fairlead 29 after gate control signal fairlead 25 before high-voltage connection hole 24, ion gate, ion gate.Three gas ports are respectively carrier gas air inlet 30, drift gas air inlet 31 and Inner eycle gas outlet 32.Wherein high-voltage connection hole 24 goes between to the metal sleeve 6 in ionization chamber, before ion gate, gate control signal fairlead 25 goes between to the Qianmen conducting ring 17 in ion gate component 9, after ion gate, gate control signal fairlead 26 goes between to the back door conducting ring 21 in ion gate component 9, drift region voltage of electric field fairlead 27 goes between to the conducting ring in division module 10, hole gate voltage fairlead 28 goes between to hole grid 11, and shell 8 is connected to the ground by lead-in wire by ground signalling fairlead 29.Carrier gas air inlet 30 is positioned at shell 8 head, with shell 8 internal run-through, for inputting required carrier gas, thus carries measured matter and enters reaction zone; Drift gas air inlet 31 is through with drift region, Inner eycle gas outlet 32 and shell 8 internal run-through, and described carrier gas and drift gas all discharge drift tube from Inner eycle gas outlet 32.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. integral type ion mobility spectrometry drift tube, it is characterized in that, comprise shell (8), insulation inner casing (7), permeable membrane element (1), ionization chamber (5), ion gate component (9), more than one division module (10), hole grid (11), charge-trapping pole (12) and rail unit;
The tubular construction that its housing (8) is metal material, the outer circumference surface of its one end is processed with the shaft shoulder, its inner peripheral surface is processed with radial annular protrusion; The tubular construction that described insulation inner casing (7) is high-temperature insulation material, it is inner that insulation inner casing (7) is coaxially nested in shell (8), and with the inner peripheral surface interference fit of shell (8); The annular protrusion of one end of insulation inner casing (7) and shell (8) inside is conflicted; Described permeable membrane element (1) is arranged on the end of shell (8) shaft shoulder end, and the front end of permeable membrane element (1) arranges sample gas air inlet (2) and sample gas gas outlet (3);
It is inner that described ionization chamber (5), ion gate component (9), more than one division module (10) and hole grid (11) are coaxially arranged on insulation inner casing (7) successively, and all with the inner peripheral surface interference fit of the inner casing (7) that insulate; Wherein conflicted by the annular protrusion of ceramic ring and shell (8) inside in one end of ionization chamber (5); All isolated by ceramic ring between described ion gate component (9) and division module (10), between hole grid (11) and division module (10); Described division module (10) comprises two conducting rings, dead ring (23) and dividing potential drop high resistant; The outer circumference surface of described dead ring (23) is processed with the rectangular channel for installing dividing potential drop high resistant; Two conducting rings fit tightly respectively at the two ends, left and right of dead ring (23), and two conducting rings are connected with the two ends of dividing potential drop high resistant respectively; The outer rim of two conducting rings all inwardly bending simultaneously, makes dead ring (23) be nested between two conducting rings; Described hole grid (11) is positioned at division module (10) rear side, and and isolated by ceramic ring between division module (10);
Described charge-trapping pole (12) is positioned at hole grid (11) rear side, and charge-trapping pole (12) comprise electrode and lead-in wire, and wherein electrode is the convex dish structure of stainless steel, and its face relative with hole grid (11) is convex surface; Described lead-in wire stretches out shell (8); Described rail unit comprises afterbody cover (15), Compress Spring (13) and pressure head (14), wherein afterbody cover (15) coaxial package is outside at lead-in wire, isolated by ceramic ring between afterbody cover (15) and hole grid (11), afterbody cover (15) is isolated by insulating case and lead-in wire simultaneously, and and between lead-in wire, sealing ring is installed; At afterbody cover (15) excircle suit Compress Spring (13), one end of described Compress Spring (13) and the shaft shoulder of afterbody cover (15) are conflicted, the other end is conflicted with the pressure head (14) being arranged on afterbody cover (15) excircle, and described pressure head (14) is affixed with shell (8);
Described shell (8) is provided with gate control signal fairlead (26) after gate control signal fairlead (25) before high-voltage connection hole (24), ion gate, ion gate, drift region voltage of electric field fairlead (27), hole gate voltage fairlead (28) and ground signalling fairlead (29); And carrier gas air inlet (30), drift gas air inlet (31) and Inner eycle gas outlet (32).
2. integral type ion mobility spectrometry drift tube as claimed in claim 1, it is characterized in that, described permeable membrane element (1) comprises permeable membrane, permeable membrane skeleton and film heating plate, and permeable membrane and film heating plate are directly installed on permeable membrane skeleton.
3. integral type ion mobility spectrometry drift tube as claimed in claim 1, it is characterized in that, described ionization chamber (5) comprises metal sleeve (6) and the radioactive source paillon foil of the equal opening in two ends; Described metal sleeve (6) is coaxially nested in insulation inner casing (7), and is conflicted by the annular protrusion of ceramic ring and shell (8) inside; The inner peripheral surface of metal sleeve (6) installs radioactive source paillon foil, and described radioactive source paillon foil is located by the shaft shoulder of metal sleeve (6) inner peripheral surface.
4. integral type ion mobility spectrometry drift tube as claimed in claim 3, it is characterized in that, described radioactive source paillon foil is 10mCi's
63ni-radiator beta-ray.
5. integral type ion mobility spectrometry drift tube as claimed in claim 1, it is characterized in that, described ion gate component (9) comprises ceramics seat (16), Qianmen conducting ring (17), Qianmen (18), insulating trip (19), back door (20) and back door conducting ring (21); Metal sleeve (6) in one end of described ceramics seat (16) and ionization chamber (5) is conflicted, and the ceramic ring of the other end and division module (10) front end is conflicted; Qianmen conducting ring (17), Qianmen (18), insulating trip (19), back door (20), back door conducting ring (21) are arranged on the limited post of ceramics seat (16) inner peripheral surface successively by respective stopper slot.
6. integral type ion mobility spectrometry drift tube as claimed in claim 5, it is characterized in that, the brass material that described Qianmen conducting ring (17) and back door conducting ring (21) are electric conductive oxidation process, Qianmen (18) and back door (20) are stainless steel laser corrosion silk screen, and insulating trip (19) is polytetrafluoro material.
7. integral type ion mobility spectrometry drift tube as claimed in claim 1, it is characterized in that, the dividing potential drop high resistant in described division module (10) is the Chip-R of 1M Ω.
8. integral type ion mobility spectrometry drift tube as claimed in claim 1, is characterized in that, described hole grid (11) is stainless steel laser corrosion silk screen.
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| CN201310306275.3A CN103400742B (en) | 2013-07-19 | 2013-07-19 | Integral type ion mobility spectrometry drift tube |
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| CN201310306275.3A CN103400742B (en) | 2013-07-19 | 2013-07-19 | Integral type ion mobility spectrometry drift tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104730558B (en) * | 2014-12-18 | 2018-05-22 | 中国原子能科学研究院 | The accurate drift tube position sensitive detector of cosmic ray μ imagings |
| CN109874222B (en) * | 2017-12-06 | 2022-10-25 | 清华大学 | Drift tube, drift tube linear accelerator and drift tube processing method |
| GB201808893D0 (en) * | 2018-05-31 | 2018-07-18 | Micromass Ltd | Bench-top time of flight mass spectrometer |
| GB201808912D0 (en) | 2018-05-31 | 2018-07-18 | Micromass Ltd | Bench-top time of flight mass spectrometer |
| GB201808932D0 (en) | 2018-05-31 | 2018-07-18 | Micromass Ltd | Bench-top time of flight mass spectrometer |
| CN109283570B (en) * | 2018-10-31 | 2020-08-25 | 西安交通大学 | Method for measuring drift velocity of electrons in gas with external electric field |
| CN112802732B (en) * | 2021-01-07 | 2023-04-07 | 上海奕瑞光电子科技股份有限公司 | Ceramic migration tube and manufacturing method thereof |
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| CN1950698A (en) * | 2004-07-27 | 2007-04-18 | 工程吸气公司 | Ion mobility spectrometer comprising a corona discharge ionization element |
| CN101427130A (en) * | 2006-01-02 | 2009-05-06 | 卓漂仪谱公司 | Multi-dimensional ion mobility spectrometry apparatus and methods |
| US8173959B1 (en) * | 2007-07-21 | 2012-05-08 | Implant Sciences Corporation | Real-time trace detection by high field and low field ion mobility and mass spectrometry |
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| KR101068827B1 (en) * | 2011-03-17 | 2011-10-04 | (주)센서테크 | Drifttube device combined flow lines with a body |
| CN103748462B (en) * | 2011-06-16 | 2017-05-31 | 蒙特利尔史密斯安检仪公司 | Annular ionization source |
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|---|---|---|---|---|
| CN1950698A (en) * | 2004-07-27 | 2007-04-18 | 工程吸气公司 | Ion mobility spectrometer comprising a corona discharge ionization element |
| CN101427130A (en) * | 2006-01-02 | 2009-05-06 | 卓漂仪谱公司 | Multi-dimensional ion mobility spectrometry apparatus and methods |
| US8173959B1 (en) * | 2007-07-21 | 2012-05-08 | Implant Sciences Corporation | Real-time trace detection by high field and low field ion mobility and mass spectrometry |
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