CN102479664A - Flat-type ion mobility spectrum - Google Patents
Flat-type ion mobility spectrum Download PDFInfo
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- CN102479664A CN102479664A CN2010105666985A CN201010566698A CN102479664A CN 102479664 A CN102479664 A CN 102479664A CN 2010105666985 A CN2010105666985 A CN 2010105666985A CN 201010566698 A CN201010566698 A CN 201010566698A CN 102479664 A CN102479664 A CN 102479664A
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Abstract
The invention discloses included-angle flat-type asymmetric field iron mobility tube. The iron mobility tube comprises: an ionization source, a V-shaped electrode, a flat electrode, an array detector, a high voltage radio frequency power supply HV and a direct current scanning power supply CV. The V-shaped electrode faces the flat electrode, and the V-shaped electrode and the flat electrode form a symmetrical structure. The V-shaped electrode or the flat electrode is connected with the high voltage radio frequency power supply through a lead. The flat electrode or the V-shaped electrode is connected with the earth through the lead. The ionization source and a sample gas entrance are arranged on an outside of one end which is parallel to a V-shaped cross section. The other end is provided with a gas outlet. The array detector is arranged on the gas outlet which is close to the V-shaped cross section. In the invention, under the condition of not changing a scanning voltage, various kinds of ions possessing electric field dependence mobility can be detected simultaneously. By using the traditional parallel-plate asymmetric field mobility tube, each scanning voltage point can only detect one kind of the electric field mobility. By using the iron mobility tube of the invention, the above disadvantage can be made up. Besides, the mobility tube of the invention possesses a simple structure, a high ionic utilization rate and many other characteristics. By using the mobility tube, continuous uninterrupted detection can be realized.
Description
Technical field
The present invention relates to transference tube, the flat asymmetric field transference tube of specifically a kind of angle.The outstanding feature of this migration tube is to remedy the deficiency of traditional asymmetric field migration tube, promptly under the situation that does not change electric field strength or bucking voltage, can detect the various ions that electric field relies on mobility that have simultaneously.In addition, migration tube of the present invention has simple in structure, and characteristics such as the utilance height of ion can realize that continuous free of discontinuities detects.
Background technology
The ion mobility spectrometry technology is a kind of separate analytical technique based on ionic mobility.Be widely used in fields such as airport security, anti-terrorism explosive detection, drugs and precursor chemicals detection, biochemical war agent detection at present, and range of application is also in continuous expansion.The ion mobility spectrometry technology mainly is divided into two types, and one type is the ion mobility spectrometry of the traditional type that taken the lead in researching and developing by states such as Great Britain and Americas.Another kind of is the asymmetric field formula ion mobility spectrometry that was proposed in 1993 by people such as the Buryakov of the former Soviet Union.The former utilizes low (E/N＜2Td, 1Td=10
-17Vcm
2) down the mobility of same substance gaseous ion one determined value is arranged under certain condition, carries out separation detection based on the difference of different material mobility, characteristics be qualitative ability than higher, material is prone to confirm with the corresponding relation at spectrum peak.The latter then is the gaseous ion that utilizes same substance, and (the different separation detection of carrying out of the mobility under E/N＞40Td) and the low electric field, characteristics are that apparatus structure is very simple, are easy to realize miniaturization at high electric field.
Under the high electric field, the mobility of ion can be expressed as:
K＝K
0(1+α)
Wherein, K is the mobility of ion under the High-Field, K
0Be the low mobility of ion after the match, for ionic mobility under the High-Field with respect to low rate of change after the match, its value can just can be born, because of material different.Low α=0 after the match.
The principle of asymmetric field ion mobility spectrometry is following: make substance ion pass through the drift region perpendicular to direction of an electric field with carrier gas, the drift region applies the asymmetric field with the positive and negative switching of radio frequency, and in whole rf period, the time average of voltage is zero.Like this, in a height section, ion all has a vertical displacement with mobility K along electric field, still, if High-Field is different with low mobility after the match, in one-period, will on perpendicular to direction, leave original position on the ion population, produces a clean displacement.Through the accumulation of certain hour, this displacement of ion will make it get on the pole plate and be neutralized.In order to make this ion smoothly through detection zone, the direct current electric field that can on original electric field, superpose, when adding, DC electric field was suitable, ion clean displacement in vertical direction was zero, and then can be detected through sense channel smoothly.Through scanning above-mentioned DC electric field, just can detect different ions.
The asymmetric field ion mobility spectrometry has flat and two kinds of configurations of coaxial circles pillar.
Discover that plate armature can be realized the detection of all ions, different ions is not discriminated against effect, but can not realize focusing function, thereby sensitivity is lower.Coaxial circles pillar structure can realize that ion converges, and can produce good focusing effect to the ion with certain mobility characteristics, helps realizing high-sensitivity detection.Traditional flat asymmetric migration tube adopts the parallel design of two-plate, under same radio-frequency voltage and bucking voltage, can only detect the ion with identical mobility electric field dependence α.
Angle of the present invention flat asymmetric field transference tube has been set up an electric field that has the gradual change characteristic on perpendicular to the carrier gas direction; The ion of different α can pass through in different lateral attitudes; Its basic principle is, for the ion that under certain radio-frequency voltage electric field and bucking voltage electric field, can pass through, after having reduced these two fields in proportion; Because of α also will change, ion can not arrive the detection utmost point through the Disengagement zone.(please refer to document: Analyst, 2007,132,842-864)
Summary of the invention
The present invention relates to the flat asymmetric field transference tube of a kind of angle.The outstanding feature of this migration tube is to remedy the deficiency of traditional asymmetric field migration tube, promptly under the situation that does not change radio-frequency voltage and bucking voltage, can detect the various ions that electric field relies on mobility that have simultaneously.In addition, migration tube of the present invention has simple in structure, and characteristics such as the utilance height of ion can realize that continuous free of discontinuities detects.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
A kind of flat ion mobility spectrometry; Comprise top crown, bottom crown, ion acceptor; Intersect acute angle perpendicular to the cross section extended line flow direction of sample gas, top crown and bottom crown; Bottom crown is a plate-like structure, and top crown is identical with bottom crown shape size and overlap in the normal direction projection of bottom crown;
Sample gas feeds from an end of top crown and bottom crown, and the zone between top crown and bottom crown of flowing through; The other end in top crown and bottom crown is provided with ion acceptor; The ion acceptor array of said ion acceptor for arranging perpendicular to bottom crown; The receiving plane of ion acceptor is perpendicular to the airflow direction of sample gas, and the ion acceptor in the array links to each other with signal acquiring processing system through signal amplifier respectively.
Top crown is a plate-like structure or inverted v-shaped structure, and the top angle of V font is the obtuse angle.
Top crown or bottom crown link to each other with the direct current scanning power supply with radio-frequency power supply, bottom crown or top crown ground connection; Said signal amplifier micro current amplifier; Said signal acquiring processing system is made up of data acquisition card and computer.
The invention has the advantages that:
1. the present invention has kept the advantage of asymmetric field transference tube, and is promptly simple in structure, is easy to miniaturization.
2. outstanding advantage of the present invention is: built the detection electric field of gradual change simultaneously at a passage, detected when can realize the ion to different α, remedied the deficiency of this type of traditional migration tube.
3. the present invention can be fully with the ionization source of existing various ionization sources as migration tube of the present invention.
4. the present invention can utilize existing all technology such as dopant technology etc. as the corrective measure that improves migration tube performance of the present invention.
What in a word, the present invention showed is a kind of flat ion mobility spectrometry.The outstanding feature of this migration tube is to remedy the board-like deficiency of conventional flat, promptly under the situation that does not change electric field, can detect the various ions that electric field relies on mobility that have simultaneously, realizes ion isolation.In addition, migration tube of the present invention has simple in structure, and characteristics such as the utilance height of ion can realize that continuous free of discontinuities detects.
Description of drawings
Fig. 1 is a structural representation of the present invention; The direction of arrow is airflow direction among the figure.
Embodiment
A kind of flat ion mobility spectrometry; Comprise top crown 1, bottom crown 2, ion acceptor 3; Perpendicular to the flow direction of sample gas, top crown 1 intersects acute angle with the cross section extended line of bottom crown 2; Bottom crown 2 is a plate-like structure, and top crown 1 is identical with bottom crown 2 shape sizes and overlap in the normal direction projection of bottom crown 2; Sample gas feeds from an end of top crown 1 and bottom crown 2, and the zone of flow through 2 of top crown 1 and bottom crowns; The other end in top crown 1 and bottom crown 2 is provided with ion acceptor 3; The ion acceptor array of said ion acceptor 3 for arranging perpendicular to bottom crown; The receiving plane of ion acceptor is perpendicular to the airflow direction of sample gas, and the ion acceptor in the array links to each other with signal acquiring processing system through signal amplifier 8 respectively.Said top crown 1 is a plate-like structure or inverted v-shaped structure, and the top angle of V font is the obtuse angle.Top crown 1 or bottom crown 2 link to each other with the direct current scanning power supply with radio-frequency power supply 9, bottom crown 2 or top crown 1 ground connection; Said signal amplifier 8 micro current amplifiers; Said signal acquiring processing system is made up of data acquisition card and computer.
During detection, can V-arrangement pole plate 1 be applied with asymmetric voltage of the high-voltage radio-frequency of thousands of volts and stack scanning direct voltage, plate electrode 2 ground connection; Also can be opposite.Like this, it is constant between the two poles of the earth, to form a direction of an electric field, the sense channel of intensity gradual change.Sample is brought ionized region into by carrier gas and is carried out ionization, and the ion that ionization produces is got into sense channel by the carrier gas carrier band.Ion of different nature has the kinetic characteristic of different electric field vertical direction (radially) under the effect of high-voltage radio-frequency asymmetric electric field.Under asymmetric voltage of same high-voltage radio-frequency and scanning direct voltage; When dc voltage value is suitable; Can be to be detected on a certain position of a certain ion in sense channel through also; And generally speaking can be not to be detected through also on other positions in this passage, simultaneously, the particle that on other positions, then has another characteristic passes through.Like this, on array ion acceptor 3, just can obtain the signal graph of different ions simultaneously.At a certain voltage range interscan direct voltage, just can obtain signal---scanning voltage figure has the characteristic of topological diagram and change plan.
Claims (3)
1. a flat ion mobility spectrometry comprises top crown (1), bottom crown (2), ion acceptor (3), it is characterized in that:
Perpendicular to the flow direction of sample gas, top crown (1) intersects acute angle with the cross section extended line of bottom crown (2); Bottom crown (2) is a plate-like structure, and top crown (1) projection on the normal direction of bottom crown (2) is identical with bottom crown (2) shape size and overlap;
Sample gas feeds from an end of top crown (1) and bottom crown (2), and the zone between top crown of flowing through (1) and bottom crown (2); The other end in top crown (1) and bottom crown (2) is provided with ion acceptor (3); The ion acceptor array of said ion acceptor (3) for arranging perpendicular to bottom crown; The receiving plane of ion acceptor is perpendicular to the airflow direction of sample gas, and the ion acceptor in the array links to each other with signal acquiring processing system through signal amplifier (8) respectively.
2. migration spectrum as claimed in claim 1 is characterized in that:
Said top crown (1) is a plate-like structure or inverted v-shaped structure, and the top angle of V font is the obtuse angle.
3. migration spectrum as claimed in claim 1 is characterized in that:
Top crown (1) or bottom crown (2) link to each other with the direct current scanning power supply with radio-frequency power supply (9), bottom crown (2) or top crown (1) ground connection;
Said signal amplifier (8) micro current amplifier;
Said signal acquiring processing system is made up of data acquisition card and computer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105666985A CN102479664A (en) | 2010-11-30 | 2010-11-30 | Flat-type ion mobility spectrum |
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| CN2010105666985A CN102479664A (en) | 2010-11-30 | 2010-11-30 | Flat-type ion mobility spectrum |
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Citations (12)
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| CN1119477A (en) * | 1993-02-19 | 1996-03-27 | 莫尼托尔集团有限公司 | Cycloidal mass spectrometer and ionizer for use therein |
| US5834771A (en) * | 1994-07-08 | 1998-11-10 | Agency For Defence Development | Ion mobility spectrometer utilizing flexible printed circuit board and method for manufacturing thereof |
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| CN1639832A (en) * | 2002-03-08 | 2005-07-13 | 美国瓦里安澳大利亚有限公司 | A plasma mass spectrometer |
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| CN1741244A (en) * | 1999-11-12 | 2006-03-01 | 查尔斯斯塔克布料实验室公司 | Longitudinal field driven asymmetric ion mobility filter and detection system |
| CN1816383A (en) * | 2003-06-03 | 2006-08-09 | 监测仪器有限责任公司 | Mass spectrometer and related ionizer and methods |
| CN200953014Y (en) * | 2006-09-05 | 2007-09-26 | 北京声迅电子有限公司 | Micro explosive iron detector |
| CN101504388A (en) * | 2009-03-16 | 2009-08-12 | 中北大学 | Miniature optical ionization sensor |
| CN101667518A (en) * | 2008-09-05 | 2010-03-10 | 中国科学院大连化学物理研究所 | Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry |
| RU2398309C1 (en) * | 2009-07-16 | 2010-08-27 | Общество с ограниченной ответственностью "СМЭЛ" | Drift tube structure for ion mobility spectrometre |
-
2010
- 2010-11-30 CN CN2010105666985A patent/CN102479664A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119477A (en) * | 1993-02-19 | 1996-03-27 | 莫尼托尔集团有限公司 | Cycloidal mass spectrometer and ionizer for use therein |
| US5834771A (en) * | 1994-07-08 | 1998-11-10 | Agency For Defence Development | Ion mobility spectrometer utilizing flexible printed circuit board and method for manufacturing thereof |
| CN1741244A (en) * | 1999-11-12 | 2006-03-01 | 查尔斯斯塔克布料实验室公司 | Longitudinal field driven asymmetric ion mobility filter and detection system |
| CN1585666A (en) * | 2001-04-17 | 2005-02-23 | 查尔斯斯塔克布料实验室公司 | Methods and apparatus for electrospray-augmented high field asymmetric ion mobility spectrometry |
| CN1561532A (en) * | 2001-08-08 | 2005-01-05 | 西奥奈克斯有限公司 | Capacitive discharge plasma ion source |
| CN1639832A (en) * | 2002-03-08 | 2005-07-13 | 美国瓦里安澳大利亚有限公司 | A plasma mass spectrometer |
| CN1672238A (en) * | 2002-07-31 | 2005-09-21 | 美国瓦里安澳大利亚有限公司 | Mass spectrographic analysis equipment and method |
| CN1816383A (en) * | 2003-06-03 | 2006-08-09 | 监测仪器有限责任公司 | Mass spectrometer and related ionizer and methods |
| CN200953014Y (en) * | 2006-09-05 | 2007-09-26 | 北京声迅电子有限公司 | Micro explosive iron detector |
| CN101667518A (en) * | 2008-09-05 | 2010-03-10 | 中国科学院大连化学物理研究所 | Photoemission ionization source and application thereof in mass spectrometry or ion mobility spectrometry |
| CN101504388A (en) * | 2009-03-16 | 2009-08-12 | 中北大学 | Miniature optical ionization sensor |
| RU2398309C1 (en) * | 2009-07-16 | 2010-08-27 | Общество с ограниченной ответственностью "СМЭЛ" | Drift tube structure for ion mobility spectrometre |
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Application publication date: 20120530 |