CN201946564U - Time-of-flight mass spectrometer detector based on micro-channel plates - Google Patents
Time-of-flight mass spectrometer detector based on micro-channel plates Download PDFInfo
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- CN201946564U CN201946564U CN2010206345205U CN201020634520U CN201946564U CN 201946564 U CN201946564 U CN 201946564U CN 2010206345205 U CN2010206345205 U CN 2010206345205U CN 201020634520 U CN201020634520 U CN 201020634520U CN 201946564 U CN201946564 U CN 201946564U
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Abstract
The utility model relates to a mass spectrum analysis instrument, in particular to a time-of-flight mass spectrometer detector based on micro-channel plates, which comprises a first level micro-channel plate, a second level micro-channel plate, a coned Faraday disc and a Faraday disc shielding drum. The first level micro-channel plate, the second level micro-channel plate and the coned Faraday disc are sequentially arranged at intervals and are coaxial and paralleled. The coned bottom of the coned Faraday disc is close to the second level micro-channel plate. The Faraday disc shielding drum surrounds outside the coned Faraday disc, and the Faraday disc shielding drum and the coned Faraday disc are coaxial with space between. Output impedance formed between the coned Faraday disc and the Faraday disc shielding drum is 50 omegas, and the coned Faraday disc is in impedance matching with a 50-omega coaxial signal line which is connected with the rear portion of the coned Faraday disc. The time-of-flight mass spectrometer detector is compact in structure and convenient in use, can effectively improve quality resolution capability of a time-of-flight mass spectrometer and reduce background noises of a mass spectrogram.
Description
Technical field
The utility model relates to mass spectrometer, a kind of specifically time-of-flight mass spectrometer detector based on microchannel plate.
Background technology
Microchannel plate (Microchannel Plate, MCP) be a kind of by the be arranged in parallel electron multiplication detector of the big face battle array formed of numerous micron order electron multipliers, has very high temporal resolution, it is simple in structure, gain is high, time response is fast, is often used as the detector of time-of-flight mass spectrometer.Microchannel plate utilizes the characteristic of secondary, make ion or the electron production secondary electron of high-speed impact on its microchannel inwall, these secondary electrons clash into the microchannel inwall once more and form the electron multiplication effect under the acceleration of electric field, the current signal that amplifies back output through microchannel plate collects flight time mass spectrum figure by high-speed data acquisition card.The gain of monolithic microchannel plate can reach 10
5, in order to detect ion signal faint in the field-free flight district, two of common uses or more microchannel plate obtain higher gain in the mode that its axial direction assembling forms tandem working in the time-of-flight mass spectrometer.In traditional microchannel plate detector, on the one hand, directly use conductor to connect between the microchannel plate of series connection, there is not the electronics accelerating field, not retrained by electric field force from the zone of electronics between two microchannel plates of upper level microchannel plate outgoing, disperse easily, electronics has delay when arriving the next stage microchannel plate plane of incidence in time, thereby causes the broadening of mass spectra peak; On the other hand, faraday's dish is as the passive electrode of microchannel plate output electronics, often be made into flat structure, do not satisfy the impedance matching condition between its output impedance and the signal transmssion line, in the high-frequency signal transmission process, produce ringing noise, signals collecting to the data capture card produces interference, and the background noise in the mass spectrogram is increased.
The utility model content
The purpose of this utility model is to provide a kind of time-of-flight mass spectrometer detector based on microchannel plate.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of time-of-flight mass spectrometer detector based on microchannel plate comprises that first order microchannel plate, second level microchannel plate, cone faraday are coiled, faraday is coiled shielding cylinder;
First order microchannel plate, second level microchannel plate, cone faraday coil successively the space, coaxial, be arranged in parallel, the facies basialis pyramidis of cone faraday's dish is near second level microchannel plate; Faraday is coiled shielding cylinder and is surrounded on cone faraday and coils the outside, and with cone faraday dish between coaxial setting, be provided with the space between them;
First order microchannel plate, second level microchannel plate and faraday are coiled shielding cylinder and are linked to each other with DC power supply respectively, and electromotive force increases gradually, between the plane of incidence of the exit facet of first order microchannel plate and second level microchannel plate and the exit facet of second level microchannel plate and faraday coil and be formed with accelerating voltage and post acceleration voltage between the MCP sheet between the shielding cylinder;
The pyramid tip of cone faraday dish links to each other with the core of coaxial signal line, and faraday is coiled shielding cylinder and linked to each other with the exterior shield layer of coaxial signal line away from an end of second level microchannel plate.
It is 50 Ω that cone faraday dish and faraday are coiled the output impedance that forms between the shielding cylinder, and cone faraday is coiled between the latter linked 50 Ω coaxial signal line and realized impedance matching.
The plane of incidence of first order microchannel plate is arranged at the outside, field-free flight district of time-of-flight mass spectrometer, is parallel to the outlet aperture plate and places.
Respectively at being provided with the MCP operating voltage between first order microchannel plate and second level microchannel plate two end faces separately, voltage swing is-500～-1500V.
Microchannel on first order microchannel plate and the second level microchannel plate all favours the plate face setting of microchannel plate, and first order microchannel plate and second level microchannel plate are nonparallel mode by the microchannel incline direction on it and arrange.
The plane of incidence spacing 0.1-20mm of the exit facet of first order microchannel plate and second level microchannel plate, between the MCP sheet size of accelerating voltage be-20～-1500V.
The exit facet of second level microchannel plate and faraday are coiled receiving plane spacing 0.1-20mm, and the size of post acceleration voltage is-20～-1000V.
The area that faraday is coiled receiving plane be second level microchannel plate the exit facet area 10%～100%.
It is the cone hollow structure that faraday is coiled shielding cylinder, and the opening direction of its facies basialis pyramidis is towards the exit facet of second level microchannel plate, whole shielding cylinder ground connection.
The time-of-flight mass spectrometer detector that the utility model provides, adopt the pattern and the cone faraday of two microchannel plate series connection to coil structure, on the one hand, between two microchannel plates and between microchannel plate and the ion collecting electrode electron accelerating voltage is being set, the electronics of upper level microchannel plate outgoing is accelerated to the plane of incidence of next stage microchannel plate or the receiving plane of faraday's dish, thereby suppressed dispersing of electronics, reduce the time delay of electronics, effectively reduce the broadening of mass spectra peak in the space transmission; On the other hand, the size of cone faraday dish and shielding cylinder is by calculating, and the output impedance of design is 50 Ω, and faraday coils between the latter linked 50 Ω coaxial signal transmission lines and realize impedance matching, has significantly reduced the generation of ringing noise.A whole set of detector means compact conformation, easy to use can effectively improve the mass resolution ability of time-of-flight mass spectrometer, reduces the background noise in the mass spectrogram.
Description of drawings
Fig. 1 is a time-of-flight mass spectrometer detector arrangement schematic diagram of the present utility model.
Fig. 2 is the comparison diagram of peak width of mass spectrometry under the different MCP bar-to-bar voltages in the utility model.
Fig. 3 coils the mass spectra peak signal that obtains when impedance matching and impedance do not match for faraday in the utility model.
Embodiment
See also Fig. 1, be structural representation of the present utility model, 3 is incident ion among the figure, and 8 is first order microchannel plate outgoing electron, and 9 coil outgoing electron for second level faraday.Time-of-flight mass spectrometer detector of the present utility model, by first order microchannel plate 4 and second level microchannel plate 5, cone faraday coil 6, faraday coils shielding cylinder 7 and constitutes.
First order microchannel plate 4, second level microchannel plate 5, cone faraday coil 6 successively the space, coaxial, be arranged in parallel, cone faraday is coiled 6 facies basialis pyramidis near second level microchannel plate 5; Faraday is coiled shielding cylinder 7 and is surrounded on cone faraday and coils 6 outsides, and coils 6 coaxial settings with cone faraday, is provided with the space between them;
First order microchannel plate 4, second level microchannel plate 5 and faraday are coiled shielding cylinder 7 and are linked to each other with DC power supply respectively, and electromotive force increases gradually, between the plane of incidence 5a of the exit facet 4b of first order microchannel plate 4 and second level microchannel plate 5 and the exit facet 5b of second level microchannel plate 5 and faraday coil and be formed with accelerating voltage 12 and post acceleration voltage 13 between the MCP sheet between the shielding cylinder 7;
Cone faraday is coiled 6 pyramid tip and is linked to each other with the core of coaxial signal line 10, and faraday is coiled shielding cylinder 7 and linked to each other with the exterior shield layer of coaxial signal line 10 away from an end of second level microchannel plate 5.
The plane of incidence 4a of first order microchannel plate 4 is arranged at 1 outside, field-free flight district of time-of-flight mass spectrometer, is parallel to outlet aperture plate 2 and places.
Microchannel on first order microchannel plate 4 and the second level microchannel plate 5 all favours the plate face setting of microchannel plate, and first order microchannel plate 4 and second level microchannel plate 5 are nonparallel mode by the microchannel incline direction on it and arrange.
Faraday is coiled shielding cylinder 7 and is the cone hollow structure, and the opening direction of its facies basialis pyramidis is towards the exit facet 5b of second level microchannel plate 5, whole shielding cylinder ground connection.
The utility model is used as receiving plane from the high energy incident ion 3 in the field-free flight district 1 with the plane of incidence 4a of first order microchannel plate 4, incident ion 3 inspires secondary electron impinging upon on the microchannel inwall of first order microchannel plate 4, the secondary electron that produces clashes into the microchannel inwall once more and forms electron multiplication under the acceleration of MCP operating voltage 11, after the multiple impact, the secondary electron of multiplication flies out from the exit facet 4b of first order microchannel plate 4.First order microchannel plate outgoing electron 8 in size is-the MCP sheet of 800V between the acceleration of accelerating voltage 12 following beat with first order microchannel plate on the plane of incidence 5a of the second level microchannel plate 5 of 10mm.First order microchannel plate outgoing electron 8 forms more second level microchannel plate outgoing electron 9 producing electron multiplication on the inwall of the microchannel of second level microchannel plate 5 equally under the acceleration of MCP operating voltage 11.Following the beating of the acceleration of second level microchannel plate outgoing electron 9 accelerating voltage 13 between size is for the MCP sheet of-500V coiled on the receiving plane 6a at a distance of the cone faraday of 10mm with second level microchannel plate, and the generation current signal transfers to the high-speed data acquisition card collection by 50 Ω coaxial signal line 10.The area that faraday is coiled receiving plane 6a be set to second level microchannel plate 5 exit facet 5b area 60%.
Wherein, Z
0Be output impedance, ε
rFor filling the dielectric constant of dielectric between faraday's dish and the shielding cylinder, a coils the cone external diameter for faraday, and b is a shielding cylinder cone internal diameter.
The utility model is by between two microchannel plates and the method that electron accelerating voltage is set between microchannel plate and the ion collecting electrode, the electronics of upper level microchannel plate outgoing is accelerated to the plane of incidence of next stage microchannel plate or the receiving plane of faraday's dish, thereby suppressed dispersing of electronics, reduce the time delay of electronics, effectively reduce the broadening of mass spectra peak in the space transmission.Figure 2 shows that accelerating voltage is to the influence of peak width of mass spectrometry between the MCP sheet, the benzene sample gas of use 100ppm produces the flight time mass spectrum signal of the molecular ion of benzene in the experiment under single photon ionization pattern.As seen, between the MCP sheet, add-mass spectra peak (redness) that the electron accelerating voltage of 365V obtains during than making alive not (black) half-peak breadth want narrow more than 40%, thereby effectively improve the mass resolution ability of flight time mass spectrum.
Faraday is coiled the mass signal that obtains when impedance matching and impedance do not match as shown in Figure 3.The benzene sample gas of same use 100ppm produces the flight time mass spectrum signal of the molecular ion of benzene in the experiment under single photon ionization pattern.As can be seen from the figure, faraday is coiled impedance when not matching (black), produces a lot of ringing noises behind the mass spectra peak, and collection that can interference signal increases the background noise in the mass spectrogram, and the isotopic peak m/z79 of benzene is covered by ringing noise; When faraday is coiled impedance matching (redness), ringing noise disappears substantially, and the isotopic peak m/z79 of benzene is high-visible.
Claims (9)
1. the time-of-flight mass spectrometer detector based on microchannel plate comprises that first order microchannel plate (4), second level microchannel plate (5), cone faraday are coiled (6), faraday is coiled shielding cylinder (7), it is characterized in that:
First order microchannel plate (4), second level microchannel plate (5), cone faraday's dish (6) successively the space, coaxial, be arranged in parallel, the facies basialis pyramidis of cone faraday's dish (6) is near second level microchannel plate (5); Faraday is coiled shielding cylinder (7) and is surrounded on cone faraday dish (6) outside, and with cone faraday dish (6) between coaxial setting, be provided with the space between them;
First order microchannel plate (4), second level microchannel plate (5) and faraday are coiled shielding cylinder (7) and are linked to each other with DC power supply respectively, and electromotive force increases gradually, between the plane of incidence (5a) of the exit facet (4b) of first order microchannel plate (4) and second level microchannel plate (5) and the exit facet (5b) of second level microchannel plate (5) and faraday coil and be formed with accelerating voltage between the MCP sheet (12) and post acceleration voltage (13) between the shielding cylinder (7);
The pyramid tip of cone faraday dish (6) links to each other with the core of coaxial signal line (10), and faraday is coiled shielding cylinder (7) and linked to each other with the exterior shield layer of coaxial signal line (10) away from an end of second level microchannel plate (5).
2. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
Cone faraday dish (6) is 50 Ω with the output impedance that faraday is coiled formation between the shielding cylinder (7), and cone faraday is coiled between the latter linked 50 Ω coaxial signal line (10) and realized impedance matching.
3. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
The plane of incidence (4a) of first order microchannel plate (4) is arranged at the outside, field-free flight district (1) of time-of-flight mass spectrometer, is parallel to outlet aperture plate (2) and places.
4. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
Respectively at being provided with MCP operating voltage (11) between first order microchannel plate (4) and second level microchannel plate (5) two end faces separately, voltage swing is-500～-1500V.
5. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
Microchannel on first order microchannel plate (4) and the second level microchannel plate (5) all favours the plate face setting of microchannel plate, and first order microchannel plate (4) and second level microchannel plate (5) are nonparallel mode by the microchannel incline direction on it and arrange.
6. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
The plane of incidence (5a) the spacing 0.1-20mm of the exit facet (4b) of first order microchannel plate (4) and second level microchannel plate (5), the size of accelerating voltage between the MCP sheet (12) is-20～-1500V.
7. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
The exit facet (5b) of second level microchannel plate (5) and faraday are coiled receiving plane (6a) spacing 0.1-20mm, and the size of post acceleration voltage (13) is-20～-1000V.
8. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
The area that faraday is coiled receiving plane (6a) be second level microchannel plate (5) exit facet (5b) area 10%～100%.
9. time-of-flight mass spectrometer detector according to claim 1 is characterized in that:
It is the cone hollow structure that faraday is coiled shielding cylinder (7), and the opening direction of its facies basialis pyramidis is towards the exit facet (5b) of second level microchannel plate (5), whole shielding cylinder ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206345205U CN201946564U (en) | 2010-11-30 | 2010-11-30 | Time-of-flight mass spectrometer detector based on micro-channel plates |
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| CN2010206345205U CN201946564U (en) | 2010-11-30 | 2010-11-30 | Time-of-flight mass spectrometer detector based on micro-channel plates |
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| CN103730323A (en) * | 2012-10-10 | 2014-04-16 | 浜松光子学株式会社 | Mcp unit, mcp detector, and time-of-flight mass spectrometer |
| CN104112643A (en) * | 2013-04-22 | 2014-10-22 | 株式会社岛津制作所 | Imaging mass analysis data processing method and imaging mass spectrometer |
| CN104508792A (en) * | 2012-06-18 | 2015-04-08 | 莱克公司 | Tandem time-of-flight mass spectrometry with non-uniform sampling |
| US10950425B2 (en) | 2016-08-16 | 2021-03-16 | Micromass Uk Limited | Mass analyser having extended flight path |
| CN109884157B (en) * | 2017-12-06 | 2021-06-15 | 中国科学院大连化学物理研究所 | Novel positive and negative ion fast switching's ion detector |
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| CN103730323A (en) * | 2012-10-10 | 2014-04-16 | 浜松光子学株式会社 | Mcp unit, mcp detector, and time-of-flight mass spectrometer |
| CN104112643A (en) * | 2013-04-22 | 2014-10-22 | 株式会社岛津制作所 | Imaging mass analysis data processing method and imaging mass spectrometer |
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| US11309175B2 (en) | 2017-05-05 | 2022-04-19 | Micromass Uk Limited | Multi-reflecting time-of-flight mass spectrometers |
| US11328920B2 (en) | 2017-05-26 | 2022-05-10 | Micromass Uk Limited | Time of flight mass analyser with spatial focussing |
| US11081332B2 (en) | 2017-08-06 | 2021-08-03 | Micromass Uk Limited | Ion guide within pulsed converters |
| US11211238B2 (en) | 2017-08-06 | 2021-12-28 | Micromass Uk Limited | Multi-pass mass spectrometer |
| US11239067B2 (en) | 2017-08-06 | 2022-02-01 | Micromass Uk Limited | Ion mirror for multi-reflecting mass spectrometers |
| US11295944B2 (en) | 2017-08-06 | 2022-04-05 | Micromass Uk Limited | Printed circuit ion mirror with compensation |
| US11205568B2 (en) | 2017-08-06 | 2021-12-21 | Micromass Uk Limited | Ion injection into multi-pass mass spectrometers |
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| CN109884157B (en) * | 2017-12-06 | 2021-06-15 | 中国科学院大连化学物理研究所 | Novel positive and negative ion fast switching's ion detector |
| US11367608B2 (en) | 2018-04-20 | 2022-06-21 | Micromass Uk Limited | Gridless ion mirrors with smooth fields |
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| US11881387B2 (en) | 2018-05-24 | 2024-01-23 | Micromass Uk Limited | TOF MS detection system with improved dynamic range |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20141130 |
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| EXPY | Termination of patent right or utility model |