CN101853771A - Ionic migration spectrometer with inspiratory condenser structure - Google Patents
Ionic migration spectrometer with inspiratory condenser structure Download PDFInfo
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- CN101853771A CN101853771A CN200910048794A CN200910048794A CN101853771A CN 101853771 A CN101853771 A CN 101853771A CN 200910048794 A CN200910048794 A CN 200910048794A CN 200910048794 A CN200910048794 A CN 200910048794A CN 101853771 A CN101853771 A CN 101853771A
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Abstract
The invention discloses an ionic migration spectrometer with inspiratory condenser structure. The ionic migration spectrometer comprises a drift tube which is composed of an integrated exploring electrode and an auxiliary electrode, and the integrated exploring electrode and the auxiliary electrode are both arranged on a plane as well as a counter electrode corresponding to the plane. Under bias voltage, uniform electric field is generated in the draft tube, and sample ion flow and drifting gas forms laminar flow in the uniform electric field. The drift tube also comprises an auxiliary integrated exploring electrode which is in the same plane with the counter electrode. Because that the auxiliary integrated exploring electrode is mounted and the sample ion flow is enclosed by drifting gas, under bias voltage, positive ions and negative ions are separated and gather at the integrated exploring electrode and the auxiliary integrated exploring electrode respectively to form ion current, so that the ionic migration spectrometer can detect positive ions and negative ions simultaneously, thereby improving detection sensitivity of the ionic migration spectrometer.
Description
Technical field
The present invention relates to a kind of trace materials that is used for and detect ionic migration spectrometer, particularly relate to a kind of low-power consumption and the novel ionic migration spectrometer with inspiratory condenser structure of Sensitive Detection positive and negative ion simultaneously.
Background technology
Ion moving method (be called for short IMS) is one of main flow trace detection method in the world at present, can the on-line quick detection drugs, explosive, poison gas and biochemical gas etc., be widely used in military affairs (chemical defence, monitoring), civil various fields such as (anti-terrorism, drug law enforcement etc.).Ionic migration spectrometer (perhaps ion mobility spectrometry) is a kind of instrument according to ion principle of displacement detection discriminating material, is made up of core component drift tube and peripheral control system (as voltage control system, ion door control system, jet system, temperature control system, pressure monitoring system, data acquisition system etc.) usually.Because the excellent performance on trace materials detects of ionic migration spectrometer, be applied in the life science in structural research, space science, the medical science such as DNA air environment monitoring in early monitoring diagnosis, Detecting Pesticide, food additive component monitoring, the environment measuring such as carcinoma of mouth and lung cancer recently, soil pollution zone dynamic monitoring etc.For the ionic migration spectrometer that portable, low-power consumption, sensitive trace materials detect, field demands such as military and civilian are bigger.
Existing ionic migration spectrometer is because of problems such as structures, the miniaturization difficulty, and the drift tube of asymmetric electric field and ionic mobility spectrometer can be realized miniaturization, but owing to use high-frequency electric field, therefore the ionic migration spectrometer power consumption of this structure is than higher.Existing ionic migration spectrometer with inspiratory condenser structure can be realized small-sized, low-power consumption, begins test at present and use in national armies such as Germany.Ionic migration spectrometer with inspiratory condenser structure is by core component---drift tube and peripheral control system, and as compositions such as voltage control system, ion door control system, jet system, temperature control system, pressure monitoring system, data acquisition systems.Its operation principle is: enter drift tube after the sample molecule ionization under carrier gas is carried, in existence drift gas identical with the ion motion direction and the electric field space vertical with the ion motion direction.Be separated under the effect of different ions according to the do not coexist electric field and the drift gas of mobility, ion is got on the integrated exploring electrode and is formed ionic current.Under discrete scan bias voltage (normally-30V～30V excursion) effect, obtain ionic current-voltage curve, this curve is ionic current-voltage derivative and voltage relationship figure, just can obtains different ions mobility characteristics information, and then different material is made a distinction.
But the shortcoming of the ionic migration spectrometer of this structure is: (1) sample ions is serious along diffusion in the numeration electrode movement process, influences the resolution of ionic migration spectrometer; (2) in the scan period, can measure positive and negative ion, but synchronization can only be measured a kind of electrical ion.For form, have the electrical ion to be detected of short-life the unknown, this structure has very big defective; (3) for the substance ion to be detected that can produce positive and negative ion simultaneously, the relevant ions information that this structure can be used is not enough; (4) resolution is low.
Summary of the invention
The objective of the invention is to propose a kind of ionic migration spectrometer with inspiratory condenser structure, improved the detection sensitivity of ionic migration spectrometer, can detect positive and negative ion simultaneously, and have small-sized, advantage of low power consumption.
In order to achieve the above object, technical scheme of the present invention is as follows:
A kind of ionic migration spectrometer with inspiratory condenser structure, comprise drift tube, described drift tube comprises integrated exploring electrode and auxiliary electrode in the same plane, the numeration electrode that is oppositely arranged with this plane, under bias effect, produce uniform electric field in the drift tube, sample ions stream and drift gas form laminar flow between uniform electric field, described drift tube also comprises auxiliary integrated exploring electrode, and described auxiliary integrated exploring electrode and numeration electrode are on same plane.
The position of described auxiliary integrated exploring electrode is near 1/4 of sample ions stream inflow direction one side in drift tube.
Described sample ions stream is positioned at the center of described uniform electric field.
The diameter of described sample ions stream be approximately described numeration electrode and described integrated exploring electrode spacing 1/10.
Described being biased in its excursion, be generally-30V～+ 30V, the even saltus step of voltage spacing such as be.
Described record electrode is 2 times of its width in the length of sample ions flow direction.
Ionic migration spectrometer with inspiratory condenser structure of the present invention, because the existence of auxiliary integrated exploring electrode and sample ions stream are surrounded entirely by drift gas, under the effect of bias voltage, just different, anion is separated, get to respectively on integrated exploring electrode and the auxiliary integrated exploring electrode and form ionic current, make this ionic migration spectrometer measure positive and negative ion simultaneously, improved the detection sensitivity of ionic migration spectrometer.
Description of drawings
Fig. 1 is an ionic migration spectrometer with inspiratory condenser structure schematic diagram of the present invention;
Fig. 2 is the drift tube structure chart of ionic migration spectrometer with inspiratory condenser structure of the present invention;
Fig. 3 is that principle schematic is determined in the auxiliary integrated exploring electrode position of ionic migration spectrometer with inspiratory condenser structure of the present invention.
Embodiment
According to Fig. 1 to Fig. 3, provide preferred embodiment of the present invention, and described in detail below, enable to understand better function of the present invention, characteristics.
Shown in Figure 1 is ionic migration spectrometer with inspiratory condenser structure schematic diagram of the present invention, the ionic migration spectrometer of inspiratory condenser structure of the present invention is made up of drift tube and peripheral control system, as voltage control system, ion door control system, jet system, temperature control system, pressure monitoring system, data acquisition system etc.
As shown in Figure 2, the drift tube of ionic migration spectrometer with inspiratory condenser structure of the present invention includes integrated exploring electrode 1, auxiliary electrode 2, numeration electrode 3, auxiliary integrated exploring electrode 4.Numeration electrode 3 and auxiliary electrode 2 are connected on the bias voltage (discrete scanning power supply voltage), integrated exploring electrode 1 and auxiliary integrated exploring electrode 4 independent of each other being connected on two pre-amplification circuits, output dissimilar charges signal message.Auxiliary integrated exploring electrode 4 and numeration electrode 3 are on same plane A, and insulate between auxiliary integrated exploring electrode 4 and the numeration electrode 3, integrated exploring electrode 1 and auxiliary electrode 2 are on the B of another plane, two planes are oppositely arranged on and form parallel-plate on the geometry, the width of this parallel-plate roughly is 1/2 of a numeration electrode length, and the parallel-plate central area is the ion drift separate areas.Numeration electrode 3 and auxiliary integrated exploring electrode 4 can produce uniform electric field 5 with integrated exploring electrode 1 and auxiliary electrode 2 under bias effect.Owing to the existence of auxiliary electrode is arranged, makes whole electric field space keep uniform electric field.For being uniform electric field in the drift tube that keeps inspiratory condenser structure, should make numeration electrode 3 and auxiliary integrated exploring electrode 4 in the length and the interelectrode distance of the uniform electric field vertical direction of its generation certain proportionate relationship be arranged with integrated exploring electrode 1 and auxiliary electrode 2; Usually proportionate relationship is 2: 1.That is to say, the length of described uniform electric field, width, the ratio of height is 2: 1: 1, can guarantee a uniform electric field space substantially like this.
The sample introduction pipe 6 of sample ions stream is positioned at the center that described sample ions stream is positioned at the uniform electric field 5 of drift tube generation, the geometry symmetrical centre of the parallel-plate structure that the plane B of the plane A of electrode 3 and auxiliary integrated exploring electrode 4 and integrated exploring electrode 1 and auxiliary electrode 2 of just counting is formed, promptly roughly be positioned at two plane A, 1/2 place of B spacing.And regulating and controlling sample gas and drift air-flow velocity make sample ions stream and drift gas 7 air-flows keep laminar flow; Sample ions stream is by the circle-shaped encirclement of drift gas, and the drift gas around the sample ions stream remains balance, all is drift gas around the sample ions gas, forms " sheath stream ", therefore ion flow is had good compression.Sample ions gas can be compressed in zone line for more time under " compression " effect of " sheath stream ", reduce diffusion, therefore can improve the resolution that detects.Preferably, the diameter dimension of sample ions stream be about described numeration electrode and auxiliary integrated exploring electrode and described integrated exploring electrode and auxiliary electrode spacing about 1/10; Excessive ratio, sample ions stream initial position distribution becomes big, and the resolution of instrument will degenerate; And too small ratio, though useful to the resolution that improves instrument, but cause the reduction of instrumental sensitivity.
Under the effect of bias voltage, sample gas is just different, and anion is separated, and gets to respectively on integrated exploring electrode 1 and the auxiliary integrated exploring electrode 4 and forms ionic current.Be biased in its excursion, be generally-30V～+ 30V, the even saltus step of voltage spacing such as be.If bias voltage is 600 the most common step saltus steps, then each step voltage variety is 0.1V.Requirement is biased on each step-length will keep certain stationary value.
Ionic migration spectrometer with inspiratory condenser structure of the present invention has two exploring electrodes, integrated exploring electrode 1 (main exploring electrode) position is constant usually, the position of auxiliary integrated exploring electrode 4 is variable, can be from drift tube one end of the inflow side of sample ions stream move to the other end of outflow side.Preferably, auxiliary integrated exploring electrode 4 is positioned at 1/4 place near ion flow inflow direction one side.For different sample ions stream, auxiliary integrated exploring electrode 4 positions generally are different.For specific material, can be optimized adjusting according to different detection material kind and characteristics, need be by repeatedly testing the particular location of determining it.Auxiliary integrated exploring electrode 4 positions are foundations
k(T)＝(h*(h-0.5hs))*V/(A*xE*Up)
Calculating and experimental verification are determined.As shown in Figure 3, suppose can produce positive and negative ion simultaneously after a kind of material ionization, the field intensity direction vertically downward at this moment.When if auxiliary integrated detector is placed among the figure position C, can not detect positive and negative ion information simultaneously, at this moment the material information that detection obtains is the same with the ionic migration spectrometer of common inspiratory condenser structure basically, have only in the time of to assist integrated detector to move among the figure position D, could effectively receive the anion information of this material.For the material that generates ion-conductance attribute (electropositive or elecrtonegativity) after material that can produce positive and negative ion after the ionization simultaneously and the unknown ionization, perhaps short-lived ion, the present invention has extraordinary detection to differentiate performance.So this checkout gear has the better response characteristic concerning specific material detects.
Adopt technical scheme of the present invention, ionic migration spectrometer with inspiratory condenser structure can be measured simultaneously for positive and negative ion, for some material that can produce positive and negative ion simultaneously better detection sensitivity and accuracy in detection is arranged; And required power volume is little, and is in light weight, and detecting instrument integral miniaturization or subminaturization realize easily.The drift tube test chamber of ionic migration spectrometer with inspiratory condenser structure is inner to be cleaned easily, compares with existing ion mobility spectrometry, can recover again in a short period of time after being polluted to measure, so operation and maintenance is extremely easy; Overall structure is simple, is easy to processing and realizes.
The front provides the description of more detailed embodiment, so that any technical staff in this area understands the present invention.To this embodiment, those skilled in the art can make various modifications or conversion on the basis that does not break away from the principle of the invention.Be that every simple, equivalence of doing according to the claims and the description of the present patent application changes and modification, all fall into the claim protection range of patent of the present invention.
Claims (6)
1. an ionic migration spectrometer with inspiratory condenser structure comprises drift tube, and described drift tube comprises integrated exploring electrode and auxiliary electrode in the same plane, the numeration electrode that is oppositely arranged with this plane; Produce uniform electric field in the drift tube under bias effect, sample ions stream and drift gas form laminar flow between uniform electric field; It is characterized in that described drift tube also comprises auxiliary integrated exploring electrode, described auxiliary integrated exploring electrode and numeration electrode are on same plane.
2. ionic migration spectrometer with inspiratory condenser structure according to claim 1 is characterized in that, the position of described auxiliary integrated exploring electrode is near 1/4 of ion flow inflow direction one side in drift tube.
3. ionic migration spectrometer with inspiratory condenser structure according to claim 1 and 2 is characterized in that described sample ions stream is positioned at the center of described uniform electric field.
4. ionic migration spectrometer with inspiratory condenser structure according to claim 3 is characterized in that, the diameter of described sample ions stream be approximately described numeration electrode and described integrated exploring electrode spacing 1/10.
5. ionic migration spectrometer with inspiratory condenser structure according to claim 1 is characterized in that, described being biased in its excursion, be generally-30V～+ 30V, the even saltus step of voltage spacing such as be.
6. ionic migration spectrometer with inspiratory condenser structure according to claim 1 is characterized in that, described record electrode is 2 times of its width in the length of sample ions flow direction.
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| CN200910048794A CN101853771A (en) | 2009-04-03 | 2009-04-03 | Ionic migration spectrometer with inspiratory condenser structure |
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Cited By (5)
| 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 |
| CN102478491A (en) * | 2010-11-30 | 2012-05-30 | 中国科学院大连化学物理研究所 | Nanoscale aerosol particle spectrum detection analyzer |
| CN104823045A (en) * | 2012-11-29 | 2015-08-05 | 布鲁克·道尔顿公司 | Apparatus and method for cross-flow ion mobility spectrometry |
| CN106199195A (en) * | 2016-07-19 | 2016-12-07 | 牛明慧 | Printed circuit board (PCB) ion migration test system |
| CN113092568A (en) * | 2021-03-22 | 2021-07-09 | 西北大学 | Real-time online ion mobility spectrometry monitoring device and method |
-
2009
- 2009-04-03 CN CN200910048794A patent/CN101853771A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102478491A (en) * | 2010-11-30 | 2012-05-30 | 中国科学院大连化学物理研究所 | Nanoscale aerosol particle spectrum detection analyzer |
| 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 |
| CN102176403B (en) * | 2010-12-31 | 2013-04-17 | 清华大学 | Ionic focusing method for high-field asymmetric waveform ion mobility spectrometer with flat plate structure |
| CN104823045A (en) * | 2012-11-29 | 2015-08-05 | 布鲁克·道尔顿公司 | Apparatus and method for cross-flow ion mobility spectrometry |
| CN106199195A (en) * | 2016-07-19 | 2016-12-07 | 牛明慧 | Printed circuit board (PCB) ion migration test system |
| CN113092568A (en) * | 2021-03-22 | 2021-07-09 | 西北大学 | Real-time online ion mobility spectrometry monitoring device and method |
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