CN2862027Y - IMS detecting instrument - Google Patents
IMS detecting instrument Download PDFInfo
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- CN2862027Y CN2862027Y CN 200520047493 CN200520047493U CN2862027Y CN 2862027 Y CN2862027 Y CN 2862027Y CN 200520047493 CN200520047493 CN 200520047493 CN 200520047493 U CN200520047493 U CN 200520047493U CN 2862027 Y CN2862027 Y CN 2862027Y
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- ion
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Abstract
The utility model discloses an IMS detector, comprising an ion chamber, a drift tube, a first electrode, and a second electrode. The second electrode is arranged between the ion chamber and the drift tube; an ion exchange zone is formed between the first electrode and the second electrode. The utility model adopts a double pulse gate structure; after sample ion is generated, when the pulse gate is closed, the sample ion is restricted in a non-field zone, rather than being lost by directly striking the pulse gate; therefore, the detection efficiency of sample ion is improved, and the detection limit of ion is reduced, so as to effectively improve the detection sensitivity of instrument; no electric field exists in the exchange area, good for the ion exchange between ion and sample molecule.
Description
Technical field
The utility model relates to a kind of IMS detector.
Background technology
Ion mobility spectrometry (IMS) detects, be utilize detected material molecule chemical characteristic make detected material molecular ionization, belong to alkaloid (is that the ternary that extract substitutes the alkyl alkaloid as heroin and cocaine) as drugs from plant, has very high proton affinity, especially under gas phase condition, its ability of capturing proton is bigger, very easily captures proton and becomes positive ion, and most explosive electron affinity is very big, and easily trapped electron becomes negative ion.
Working gas in the IMS detector (carrier gas) is at ion gun (ray, methods such as laser) ionization under the effect, carrier gas and sample gas after the ionization are had an effect, make sample gas ionization (secondary ionization), gaseous ion to be measured after the ionization is rolled into a ball and is drifted about to collector under electric field action, corresponding different materials forms corresponding different time peak, thereby is distinguished.
The existing IMS detector is two sections subregions, be ionized region and drift Disengagement zone, a part is told in the Disengagement zone that will drift about, as ion-exchange area, it adopts an electronic impulse door ion implantation technique, be provided with in accelerating field the inside can the barrier ion motion the silk screen door.
In the structure of above-mentioned existing IMS detector, also has more intense electric-force gradient in its ion-exchange area, after sample ions to be detected generates, in the electronic impulse door down periods, the sample ions of generation all hits on the silk screen losing under electric field action, reduced the sensitivity that instrument detects, and be unfavorable for that drift gas ion and testing sample molecule carry out ion-exchange, reduced sample molecule ionization probability, influenced the detection of ion.
Summary of the invention
The purpose of this utility model is to overcome in the above-mentioned prior art to get to owing to ion-exchange area exists electric potential difference, the feasible measured ion for the treatment of, a kind of novel IMS detector is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of IMS detector, comprise an ionization chamber, a drift tube and one first gate electrode, also comprise one second gate electrode, described second gate electrode is located between this ionization chamber and this drift tube, is formed with an ion-exchange area between this first, second gate electrode.
Wherein, at this drift tube a plurality of ring electrodes are set evenly.This first gate electrode is located at the rear portion of first ring electrode.
And this first gate electrode is a mesh-like.
In addition, this second gate electrode is an annular grid board.This grid board is provided with a plurality of pores.
In addition, this ionization chamber becomes cylindric.
Positive progressive effect of the present utility model is: adopt the ion of dipulse door to annotate into structure, after sample ions produces, in the pulse gate down periods, sample ions is limited in the field-free region, rather than directly gets on the pulse gate and lose, and has improved the detector efficiency of sample ions, reduced the line that detects of ion, from effectively having improved instrument detecting sensitivity in essence, the exchange area does not have electric field, helps the ion-exchange between ion and the sample molecule.
Description of drawings
Fig. 1 is the part section structural representation of the utility model one embodiment.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.
As shown in Figure 1, a kind of IMS detector, comprise an ionization chamber 1, a drift tube 2 and one first gate electrode 3, also comprise one second gate electrode, described second gate electrode is located between this ionization chamber 1 and this drift tube 2, is formed with an ion-exchange area between this first gate electrode 3 and second gate electrode.
At this drift tube 2 a plurality of ring electrodes 21 are set evenly, voltage such as add at each ring electrode and produce uniform electric field.
This first gate electrode 3 is located at the rear portion of first ring electrode 21, is mesh-like.Can play the effect of electromagnetic screen, prevent electromagnetic interference (EMI), thereby keep the electric field in the drift tube even.
In addition, this second gate electrode grid board 4 that is an annular.This grid board is provided with a plurality of pores 41.
What described ionization chamber 1 adopted is cylinder-like structure, and an end is provided with sample holes 11, generation be " hyperbolic curve " electric field, have to make ion to the effect that central axis focuses on, can limit the direction of ion flow.
During beginning, be iso-electric between ionization chamber 1, grid board 4, first gate electrode 3, ion is constrained between ionization chamber 1 and the grid board 4.Then, apply first pulse to grid board 4, it is 4 charged a period of times of grid board, this time is exactly the width of pulse, under the effect of this pulse, ion is injected into the zone between the grid board 4 and first gate electrode 3, and promptly ion-exchange area realizes that the ion operative constraint is in this zone by amplitude and the width of adjusting pulse.After the abundant exchange charge of ion, apply second pulse to first gate electrode 3, ion enters drift region just by ion-exchange area.The width of same second pulse and amplitude are adjustable.
Described ion-exchange area, not when first gate electrode applies second pulse, each point is in equipotential in this zone, helps charge exchange and energy exchange between the ion.And in " electronic impulse door " folding, moment becomes a high electric field region, makes ion enter drift region.
Claims (7)
1, a kind of IMS detector, comprise an ionization chamber, a drift tube and one first gate electrode, it is characterized in that it also comprises one second gate electrode, described second gate electrode is located between this ionization chamber and this drift tube, is formed with an ion-exchange area between this first, second gate electrode.
2, IMS detector according to claim 1 is characterized in that, at this drift tube a plurality of ring electrodes is set evenly.
3, IMS detector according to claim 2 is characterized in that, this first gate electrode is located at the rear portion of first ring electrode.
4, IMS detector according to claim 3 is characterized in that, this first gate electrode is a mesh-like.
5, IMS detector according to claim 4 is characterized in that, this second gate electrode is an annular grid board.
6, IMS detector according to claim 5 is characterized in that, this grid board is provided with a plurality of pores.
7, IMS detector according to claim 6 is characterized in that, this ionization chamber becomes cylindric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520047493 CN2862027Y (en) | 2005-12-14 | 2005-12-14 | IMS detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520047493 CN2862027Y (en) | 2005-12-14 | 2005-12-14 | IMS detecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2862027Y true CN2862027Y (en) | 2007-01-24 |
Family
ID=37659658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520047493 Expired - Fee Related CN2862027Y (en) | 2005-12-14 | 2005-12-14 | IMS detecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2862027Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748462A (en) * | 2011-06-16 | 2014-04-23 | 蒙特利尔史密斯安检仪公司 | Looped ionization source |
| CN110927770A (en) * | 2019-12-12 | 2020-03-27 | 中国原子能科学研究院 | Device and method for measuring particle source air kerma |
-
2005
- 2005-12-14 CN CN 200520047493 patent/CN2862027Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748462A (en) * | 2011-06-16 | 2014-04-23 | 蒙特利尔史密斯安检仪公司 | Looped ionization source |
| CN103748462B (en) * | 2011-06-16 | 2017-05-31 | 蒙特利尔史密斯安检仪公司 | Annular ionization source |
| CN110927770A (en) * | 2019-12-12 | 2020-03-27 | 中国原子能科学研究院 | Device and method for measuring particle source air kerma |
| CN110927770B (en) * | 2019-12-12 | 2021-09-03 | 中国原子能科学研究院 | Device and method for measuring particle source air kerma |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070124 Termination date: 20100114 |