CN203812853U - A screening-type time-of-flight mass spectrometer detector - Google Patents
A screening-type time-of-flight mass spectrometer detector Download PDFInfo
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- CN203812853U CN203812853U CN201420071436.5U CN201420071436U CN203812853U CN 203812853 U CN203812853 U CN 203812853U CN 201420071436 U CN201420071436 U CN 201420071436U CN 203812853 U CN203812853 U CN 203812853U
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Abstract
The utility model relates to a screening-type time-of-flight mass spectrometer detector comprising a micro channel plate (MCP) and an anode plate positioned on a back side of the micro channel plate (MCP). A signal line is connected with the anode plate. A lower aperture plate, a middle aperture plate and an upper aperture plate are arranged sequentially along an ion entering direction on a front side of the micro channel plate (MCP). The middle aperture plate is externally connected with a pulse generator. The utility model also relates to an ion screening method. According to the screening-type time-of-flight mass spectrometer detector of the utility model, through the connection of the electric pulse generator into the middle aperture plate so as to generate removing pulse strings; when undesired ions enter, the removing pulses are excited so as to make the ions to be removed before the ions reach the micro channel plate (MCP); a spectra is enabled to be clean; analysis of a target peak is not influenced; the sensitivity of the detector is improved; attenuation of the micro channel plate (MCP) is simultaneously reduced; the usage life of the MCP is greatly prolonged; and the screening-type time-of-flight mass spectrometer detector of the utility model can be applied to detection of time-of-flight mass spectrometers.
Description
Technical field
The utility model relates to time-of-flight mass spectrometer, particularly relates to a kind of screening type time-of-flight mass spectrometer detector.
Background technology
The principle of time-of-flight mass spectrometer (TOF) is: under vacuum environment, ion beam is pushed accelerating region by the repulsion positive negative pulse stuffing in repulsion district makes ion obtain acceleration energy, and different ions has different flying speeds, after field-free flight by certain length, ion separates detection by entering respectively detection zone according to the size of its mass-to-charge ratio.
In detection zone, conventionally select microchannel plate ion detector (microchannel plate is called for short MCP) as standard configuration detector.Because the feature such as MCP has that the response time is fast, highly sensitive, signal to noise ratio is high and area of detection is large, be particularly suitable for doing the detector of time-of-flight mass spectrometer.But general MCP only has the useful life of several years, vacuum error and sample contamination, be in oversaturated state etc. for a long time and cause MCP top layer secondary ability to decline, they are the principal elements that affect MCP sensitivity and life-span.In the time that sample size is large, sample contamination is to cause another principal element that the MCP life-span decays.
In ensureing enough vacuum, be the main method that reduces MCP decay by removing background peaks or unwanted fragment ion.Common method is mainly that ion transfer district adds the parts such as quadrupole rod, enters TOF reach remove at ion, but the rf frequency that this mode can only be added on quadrupole rod by change removes all ions in certain limit, cannot remove unwanted ion outside this segment limit.
Utility model content
In order to overcome above-mentioned technical problem, the purpose of this utility model is to provide a kind of screening type time-of-flight mass spectrometer detector, unwanted ion sieve is removed, thus the useful life of prolongation MCP, and another object of the present utility model is to provide a kind of ion sieve choosing method.
The technical scheme that the utility model adopts is:
A kind of screening type time-of-flight mass spectrometer detector, comprise micro-channel plate MCP and the positive plate that is positioned at the micro-channel plate MCP back side, on described positive plate, be connected to holding wire, described micro-channel plate MCP front is provided with lower aperture plate, middle aperture plate and upper aperture plate successively along ion approach axis, the external electric pulse generator of described middle aperture plate.Wherein, positive plate is the electron stream producing for receiving micro-channel plate MCP, and holding wire is for transmission of electric signals, and the electric signal transmission that positive plate is accepted is in external data collecting card.
As the further improvement of technique scheme, described lower aperture plate, middle aperture plate and upper aperture plate coaxial inner conductor are arranged.
As the further improvement of technique scheme, described lower aperture plate, middle aperture plate and upper aperture plate are metallic filaments grid mesh, mutual isolated insulation between adjacent aperture plate.The wire such as wherein to descend aperture plate, upper aperture plate be stainless steel is mainly that the electric field in order to prevent accelerating region and detection zone interpenetrates.Middle Gate net is similarly the wires such as stainless steel, is mainly used for applying the pulse train that removes that removes ion.
As the further improvement of technique scheme, between described micro-channel plate MCP and positive plate, be provided with battery lead plate, described battery lead plate be connected to the micro-channel plate MCP back side and with positive plate isolated insulation.
As the further improvement of technique scheme, described micro-channel plate MCP has two, two micro-channel plate MCPs are that electrode slice is arranged and be connected to upper and lower concentric between the two, and described battery lead plate is connected on the micro-channel plate MCP of top, and described upper aperture plate is connected in below micro-channel plate MCP.
Above-mentioned electrode slice and battery lead plate are that stainless steel is made, and profile is sheet.
As the further improvement of technique scheme, described positive plate is by metal cylindrical, and positive plate and micro-channel plate MCP, holding wire, upper aperture plate coaxial inner conductor.
The beneficial effects of the utility model are: the utility model by accessing electric pulse generator in middle aperture plate, produce and remove pulse train thus, in the time that unwanted ion enters, excite and remove pulse, unwanted ion was removed before reaching micro-channel plate MCP, make spectrogram clean, do not affect the analysis of target peak, the sensitivity of instrument is improved, reduce the decay of micro-channel plate MCP simultaneously, greatly extended the useful life of MCP.
Brief description of the drawings
Below in conjunction with drawings and embodiments, the utility model is further illustrated.
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the corresponding pulse sequence figure of air spectrogram;
Fig. 4 applies the air spectrogram removing after pulse train.
Embodiment
As depicted in figs. 1 and 2, the detector in the present embodiment comprises holding wire 1, positive plate 2, battery lead plate 3, electrode slice 4, micro-channel plate MCP 8, upper Gate net 5, middle Gate net 6, lower Gate net 7, removes pulse train 9.
Holding wire 1 is connected with positive plate 2, and holding wire 1 is fixed on positive plate center by metab 11, and positive plate 2 is embedded in the middle of polyether-ether-ketone plate 10, and bottom is parallel with polyether-ether-ketone plate 10.Positive plate 2 belows are battery lead plate 4, between positive plate and battery lead plate 4, separate insulation by four thick ceramic gaskets of 2mm.It under battery lead plate 3, is electrode slice 4, it under electrode slice 4, is upper Gate net 5, between battery lead plate 3 and electrode slice 4 and electrode slice 4 and upper Gate net 5, be respectively equipped with on a micro-channel plate MCP 8 is middle Gate net 6 under Gate net 5, middle Gate net 6 belows are lower Gate net 7, between upper aperture plate 5 and middle aperture plate 6, between middle aperture plate 6 and lower aperture plate 7, separate insulation respectively by four thick ceramic gaskets of 2mm.Wherein, middle Gate net 6 places are connected to and remove pulse train 9.The thickness of three Gate nets is all 1mm.Holding wire 1, positive plate 2, battery lead plate 3, electrode slice 4, micro-channel plate MCP 8, upper Gate net 5, middle Gate net 6, lower Gate net 7 are coaxial inner conductor alignment.
Positive plate 2 is stainless steel cylinder in the present embodiment, and upper Gate net 5, middle Gate net 6 and lower Gate net 7 are wire Gate net, and the metal diameter of wire Gate net is 25-50 μ m, and wire Gate net bar number is 80-100.
Fig. 3 is the corresponding pulse sequence figure of air spectrogram that EI-TOF records.In the present embodiment, the positive negative pulse stuffing voltage in repulsion district be respectively 230V and-230V, for ensureing that unwanted ion removes completely, need be greater than 230V therefore remove pulse train setting, in the present embodiment, be made as 430V.For removing airborne water, nitrogen and oxygen, can see that they are respectively 2860ns the corresponding flight time, 3545ns, 3785ns, is respectively 2855ns therefore remove the time delay setting of pulse train, 3540ns, 3780ns, pulsewidth setting is 40ns.Fig. 4 removes for applying the air spectrogram that EI-TOF obtains after pulse train, can find, in spectrogram, airborne water, nitrogen and three kinds of materials of oxygen are removed completely.
The course of work of the present utility model is as follows: the ion behind repulsion district, accelerating region, field-free flight district and echo area is first by lower Gate net 7, and lower Gate net 7 ground connection, for preventing that field-free flight district and detection zone penetration of electric field are to detection zone; Then ion is by middle Gate net 6, excited and removed pulse train by the positive pulse time delay that sets and pulsewidth, changes electric field, makes unwanted ion hit middle aperture plate 6, realized several unwanted ions are removed; Then ion enters micro-channel plate MCP 8 by upper Gate net 5 again; Ion enters after micro-channel plate MCP 8, can bump with micro-channel plate MCP 8 surfaces, produces secondary electron, and after two micro-channel plate MCPs 8, electronics has produced the growth of many times; Then these electronic impacts are to positive plate 2, and electronics is received by positive plate 2, is transferred on outside data collecting card by holding wire 1, realizes signal formation.
The above be the utility model preferred embodiment, it does not form the restriction to the utility model protection range.
Claims (6)
1. a screening type time-of-flight mass spectrometer detector, comprise micro-channel plate MCP (8) and be positioned at the positive plate (2) at micro-channel plate MCP (8) back side, on described positive plate (2), be connected to holding wire (1), it is characterized in that: described micro-channel plate MCP (8) is positive is provided with lower aperture plate (7), middle aperture plate (6) and upper aperture plate (5) successively along ion approach axis, the external electric pulse generator of described middle aperture plate (6).
2. screening type time-of-flight mass spectrometer detector according to claim 1, is characterized in that: described lower aperture plate (7), middle aperture plate (6) and upper aperture plate (5) coaxial inner conductor are arranged.
3. screening type time-of-flight mass spectrometer detector according to claim 1 and 2, it is characterized in that: described lower aperture plate (7), middle aperture plate (6) and upper aperture plate (5) are metallic filaments grid mesh mutual isolated insulation between adjacent aperture plate.
4. screening type time-of-flight mass spectrometer detector according to claim 1, it is characterized in that: between described micro-channel plate MCP (8) and positive plate (2), be provided with battery lead plate (3), described battery lead plate (3) be connected to micro-channel plate MCP (8) back side and with positive plate (2) isolated insulation.
5. screening type time-of-flight mass spectrometer detector according to claim 4, it is characterized in that: described micro-channel plate MCP (8) has two, two micro-channel plate MCPs (8) are for upper and lower concentric layout and be connected to electrode slice (4) between the two, it is upper that described battery lead plate (3) is connected to top micro-channel plate MCP (8), and described upper aperture plate (5) is connected in below micro-channel plate MCP (8).
6. screening type time-of-flight mass spectrometer detector according to claim 1, is characterized in that: described positive plate (2) is by metal cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071436.5U CN203812853U (en) | 2014-02-19 | 2014-02-19 | A screening-type time-of-flight mass spectrometer detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420071436.5U CN203812853U (en) | 2014-02-19 | 2014-02-19 | A screening-type time-of-flight mass spectrometer detector |
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| Publication Number | Publication Date |
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| CN203812853U true CN203812853U (en) | 2014-09-03 |
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| CN201420071436.5U Withdrawn - After Issue CN203812853U (en) | 2014-02-19 | 2014-02-19 | A screening-type time-of-flight mass spectrometer detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824749A (en) * | 2014-02-19 | 2014-05-28 | 广州禾信分析仪器有限公司 | Filter type flight time mass spectrometer detector and ion screening method |
| CN108630516A (en) * | 2017-03-24 | 2018-10-09 | 广州禾信仪器股份有限公司 | Mass spectrometer detector |
| CN108648982A (en) * | 2018-04-28 | 2018-10-12 | 西北核技术研究所 | A kind of ion transmission method and time-of-flight mass spectrometer based on lock-out pulse |
| CN116337977A (en) * | 2021-12-15 | 2023-06-27 | 广州禾信仪器股份有限公司 | Ion detector mounting device and ion detector |
-
2014
- 2014-02-19 CN CN201420071436.5U patent/CN203812853U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824749A (en) * | 2014-02-19 | 2014-05-28 | 广州禾信分析仪器有限公司 | Filter type flight time mass spectrometer detector and ion screening method |
| CN103824749B (en) * | 2014-02-19 | 2016-05-04 | 广州禾信分析仪器有限公司 | Screening type time of-flight mass spectrometer detector and ion sieve choosing method |
| CN108630516A (en) * | 2017-03-24 | 2018-10-09 | 广州禾信仪器股份有限公司 | Mass spectrometer detector |
| CN108630516B (en) * | 2017-03-24 | 2024-02-13 | 广州禾信仪器股份有限公司 | Mass spectrometer detector |
| CN108648982A (en) * | 2018-04-28 | 2018-10-12 | 西北核技术研究所 | A kind of ion transmission method and time-of-flight mass spectrometer based on lock-out pulse |
| CN116337977A (en) * | 2021-12-15 | 2023-06-27 | 广州禾信仪器股份有限公司 | Ion detector mounting device and ion detector |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160504 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |