CN109884155A - A kind of ion detector that novel positive and negative ion is switched fast - Google Patents
A kind of ion detector that novel positive and negative ion is switched fast Download PDFInfo
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- CN109884155A CN109884155A CN201711272614.5A CN201711272614A CN109884155A CN 109884155 A CN109884155 A CN 109884155A CN 201711272614 A CN201711272614 A CN 201711272614A CN 109884155 A CN109884155 A CN 109884155A
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- chassis
- farad
- disk
- cylinder
- loop method
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Abstract
The present invention discloses a kind of ion detector that novel positive and negative ion is switched fast.It passes through double farad chassis designs of coplanar structure, and in conjunction with difference amplifier, can offset influence of the pulse interference signal of quick changes in voltage generation to amplifier, amplifier also can work normally when switching voltage.The advantage is that: structure is simple, function is reliable, it is possible to prevente effectively from influence of the voltage change to amplifier.
Description
Technical field
The present invention discloses a kind of ion detector that novel positive and negative ion is switched fast.It passes through double methods of coplanar structure
Chassis design is drawn, and with difference amplifier ining conjunction with, pulse interference signal that aperture plate quick changes in voltage generates can be offset to putting
The influence of big device, when switching voltage, amplifier also be can work normally.The advantage is that: structure is simple, function is reliable, can be with
Effectively avoid influence of the aperture plate voltage change to amplifier.
Background technique
Ion mobility spectrometry is that a kind of difference based on gaseous ion migration rate in the electric field carries out substance separation
The technology of detection.According to the difference of test object, the product ion of formation is divided into two kinds of cation, anion.Therefore, corresponding
Detection pattern is divided into two classes: positive ion mode and negative ion mode.Traditional explosive generally uses negative ion mode (novel mistake
Oxide explosive uses positive ion mode)；And test object is drugs, environmental hormone etc. under positive ion mode.It generallys use
Two-tube bimodulus, i.e. two migration tubes of apparatus preparation, using parallel schema: one runs in the positive-ion mode, one bear from
It is run under subpattern.However, causing equipment instrument, weight to increase using two-tube bimodulus.In order to overcome this defect, start using single
Pipe bimodulus mode.I.e. single migration tube detects while realization by electric field switching to negative ions.But when current switching
Between it is too long.One major reason is if to reach the pulse for being switched fast and needing to overcome and generating on amplifier in handoff procedure
Interference.
Therefore, the present invention proposes a kind of ion detector that novel positive and negative ion is switched fast, and utilizes the double of coplanar structure
Farad chassis design and differential amplification combine the impulse disturbances offset and generated in voltage handoff procedure, realize the fast of positive and negative ion
Fast change detection, structure is simple, easy to operate, high sensitivity.
Summary of the invention
The present invention discloses a kind of ion detector that novel positive and negative ion is switched fast.It passes through double methods of coplanar structure
Chassis design is drawn, and with difference amplifier ining conjunction with, pulse interference signal that aperture plate quick changes in voltage generates can be offset to putting
The influence of big device, when switching voltage, amplifier also be can work normally.The advantage is that: structure is simple, function is reliable, can be with
Effectively avoid influence of the aperture plate voltage change to amplifier.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of ion detector that positive and negative ion is switched fast, including metal grid mesh, farad chassis, loop method undercut disk,
Metallic shield cylinder, insulating cylinder；
The insulating cylinder is placed on inside metallic shield cylinder, and metal grid mesh, the loop method disk that undercuts are sequentially placed in insulation
Cylinder is internal, insulate each other；Farad chassis is placed at the cavity that loop method undercuts in the middle part of disk, and farad chassis and loop method undercut
Disk is connect with the input terminal of differentiating amplifier and reference end respectively by conducting wire；Metal grid mesh is quick switchable with generating positive and negative voltage
Power supply is connected；Metallic shield cylinder passes through wired earth.
The farad chassis is close to the surface area S1 of metal gate net side and farad chassis and metal grid mesh spacing d1, annular
Farad chassis undercuts disk and metal grid mesh spacing d2 close to the surface area S2 and loop method of metal gate net side, meets S1/d1=S2/
d2；
The farad chassis is connected with the input terminal of difference amplifier；Loop method undercuts the reference of disk and difference amplifier
End is connected.
The metallic shield cylinder and insulating cylinder are the closed hollow cylinder of left end opening right end, circular metal aperture plate,
Round farad chassis, circular ring shape farad chassis, metallic shield cylinder, insulating cylinder are coaxial arrangement.
The metal grid mesh and farad chassis and loop method undercut spacing of the disk on axis at 0.0001 to 10 millimeter.
The quick switchable power supply of the generating positive and negative voltage, output voltage amplitude is in -200V to 200V；Switching time exists
1ps to 1 minutes.
Detailed description of the invention
Fig. 1 is the ion detector that positive and negative ion is switched fast.
Wherein, 1. metal grid mesh, 2. farads of chassis, 3. loop methods undercut disk, 4. metallic shield cylinders, 5. insulating cylinders.
The ion detector and its illustrate with the combined apparatus of ion mobility spectrometry that Fig. 2 positive and negative ion is switched fast, wherein
1. 1,2. farads of chassis of metal grid mesh, 3. loop methods undercut disk, 4. metallic shield cylinders, 5. insulating cylinders, 6. offgas outlets, 7. drift gas
Entrance, 8. electrode retaining collars, 9. sample inlets, 10. ionized regions, 11. reaction zones, 12. ion gates, 13. migration area
Specific embodiment
The ion detector that positive and negative ion is switched fast and its combined apparatus schematic diagram such as Fig. 2 institute with ion mobility spectrometry
Show.When positive ion detection, apply positive voltage on migration tube, sample enters from sample inlet 9, in 11 electricity of ionized region 10 and reaction zone
After generating cation, under the electric field action that electrode retaining collar 8 is formed, enter migration area 13, the quilt after aperture plate 1 by ion gate 12
Farad chassis 2 detects；When being switched to anionic textiles, applying negative voltage on migration tube, sample enters from sample inlet 9,
After ionized region 10 and the ionization of reaction zone 11 form anion, under the electric field action that electrode retaining collar 8 is formed, enter by ion gate 12
Migration area 13 detects after aperture plate 1 by farad chassis 2, undercuts the formation of disk 3 in handoff procedure on farad chassis 2 and loop method
The ion detector that is switched fast using positive and negative ion of impulse disturbances and difference amplifier make the difference elimination, shorten due to amplification
The elongated defect of detection cycle caused by device is saturated improves detection speed.
Claims (5)
1. a kind of ion detector that positive and negative ion is switched fast, it is characterised in that: including metal grid mesh (1), farad chassis
(2), loop method undercuts disk (3), metallic shield cylinder (4), insulating cylinder (5)；
It is internal that insulating cylinder (5) is placed on metallic shield cylinder (4), and metal grid mesh (1), the loop method disk (3) that undercuts are sequentially placed in exhausted
Edge cylinder (5) is internal, insulate each other；Farad chassis (2) is placed at the cavity that loop method undercuts in the middle part of disk (3), farad chassis
(2) and loop method undercut disk (3) connect with the input terminal of differentiating amplifier and reference end respectively by conducting wire；Metal grid mesh (1)
It is connected with the quick switchable power supply of generating positive and negative voltage；Metallic shield cylinder (4) passes through wired earth.
2. the apparatus according to claim 1, it is characterised in that:
S1 and d1 is respectively farad chassis (2) between the surface area and farad chassis (2) and metal grid mesh (1) of metal gate net side
Away from；S2 and d2 be respectively loop method undercut disk (3) close to metal grid mesh (1) side surface area and loop method undercut disk (3) and gold
Belong to aperture plate (1) spacing；Meet S1/d1=S2/d2；
Farad chassis (2) is connected with the input terminal of difference amplifier；Loop method undercuts the reference end phase of disk (3) and difference amplifier
Even.
3. the apparatus according to claim 1, it is characterised in that:
Metallic shield cylinder (4) and insulating cylinder (5) are the closed hollow cylinder of left end opening right end, circular metal aperture plate (1), circle
Shape farad chassis (2), circular ring shape farad chassis (3), metallic shield cylinder (4), insulating cylinder (5) are coaxial arrangement.
4. metallic shield cylinder according to claim 1, it is characterised in that: metal grid mesh (1) and farad chassis (2) and annular
Spacing of the farad chassis (3) on axis is at 0.0001 to 10 millimeter.
5. the quick switchable power supply of generating positive and negative voltage according to claim 1, it is characterised in that: output voltage amplitude-
200V to 200V；Switching time was at 1ps to 1 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711272614.5A CN109884155B (en) | 2017-12-06 | 2017-12-06 | Ion detector for fast switching positive and negative ions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711272614.5A CN109884155B (en) | 2017-12-06 | 2017-12-06 | Ion detector for fast switching positive and negative ions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109884155A true CN109884155A (en) | 2019-06-14 |
| CN109884155B CN109884155B (en) | 2021-06-25 |
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ID=66923127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711272614.5A Active CN109884155B (en) | 2017-12-06 | 2017-12-06 | Ion detector for fast switching positive and negative ions |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100018649A1 (en) * | 2003-03-05 | 2010-01-28 | Ryoji Nishio | Plasma Processing Apparatus And Method |
| CN202373551U (en) * | 2011-12-19 | 2012-08-08 | 中国科学院大连化学物理研究所 | Ion receiving device used for ion mobility spectrometry |
| CN203325835U (en) * | 2013-07-01 | 2013-12-04 | 中国科学院大连化学物理研究所 | Time-of-flight mass spectrometer detector used for positive and negative ion detection |
| CN105225916A (en) * | 2015-09-02 | 2016-01-06 | 上海新漫传感技术研究发展有限公司 | Realize the high voltage source that single tube ionic migration spectrometer detects negative ions simultaneously |
| CN106098528A (en) * | 2016-06-14 | 2016-11-09 | 清华大学深圳研究生院 | A kind of apparatus and method reducing ionic migration spectrometer ion gate inductive kick |
-
2017
- 2017-12-06 CN CN201711272614.5A patent/CN109884155B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100018649A1 (en) * | 2003-03-05 | 2010-01-28 | Ryoji Nishio | Plasma Processing Apparatus And Method |
| CN202373551U (en) * | 2011-12-19 | 2012-08-08 | 中国科学院大连化学物理研究所 | Ion receiving device used for ion mobility spectrometry |
| CN203325835U (en) * | 2013-07-01 | 2013-12-04 | 中国科学院大连化学物理研究所 | Time-of-flight mass spectrometer detector used for positive and negative ion detection |
| CN105225916A (en) * | 2015-09-02 | 2016-01-06 | 上海新漫传感技术研究发展有限公司 | Realize the high voltage source that single tube ionic migration spectrometer detects negative ions simultaneously |
| CN106098528A (en) * | 2016-06-14 | 2016-11-09 | 清华大学深圳研究生院 | A kind of apparatus and method reducing ionic migration spectrometer ion gate inductive kick |
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| Publication number | Publication date |
|---|---|
| CN109884155B (en) | 2021-06-25 |
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