CN104078302B - Detector signal processing component capable of being adjusted by user and applicable to mass spectrometer - Google Patents
Detector signal processing component capable of being adjusted by user and applicable to mass spectrometer Download PDFInfo
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- CN104078302B CN104078302B CN201410335416.9A CN201410335416A CN104078302B CN 104078302 B CN104078302 B CN 104078302B CN 201410335416 A CN201410335416 A CN 201410335416A CN 104078302 B CN104078302 B CN 104078302B
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Abstract
The invention discloses a detector signal processing component capable of being adjusted by a user and applicable to a mass spectrometer. The detector signal processing component comprises a pre-amplification electric circuit, a multistage amplification circuit, a background deduction setting circuit, a waveform change circuit and a signal output unit, wherein the pre-amplification electric circuit is used for matching and receiving pulse signals output by a detector and conducting first amplification on the pulse signals; the multistage amplification circuit is used for receiving first amplified signals, conducting multiple times of buffer amplification on the first amplified signals and outputting the signals to a next-stage circuit; the background deduction setting circuit comprises at least one triode and is used for processing the signals from the multistage amplification circuit and outputting the signals to the next-stage circuit, wherein the triode has the functions of a comparator and has on-off states, and a threshold of the triode can be set; the waveform change circuit is used for converting irregular signals from the background deduction setting circuit into regular signals easy to detect and outputting the regular signals to a next-stage unit; the signal output unit is used for increasing driving capacity and reducing output impedance. By the adoption of the detector signal processing component capable of conducting background deduction through hardware, one-time processing on a final spectrogram provided by the mass spectrometer can be achieved conveniently, flexibly and effectively.
Description
Technical field
The present invention relates to field of non destructive testing, it particularly relates to a kind of mass spectrograph detection Signal Processing Element.
Background technology
Mass spectrograph is made up of sampling system, ionizing system, mass analyzer and mass dete ctor, record system, is aided with electricity system and the normal operation of vacuum system guarantee instrument simultaneously.Sample entrance after sampling system imports is in the ionizing system of high vacuum state and ionizes, and conventional ionization method is electron impact ionization method.The thermoelectron produced when it is to utilize filament heating interacts with the organic molecule in gas phase, makes molecule lose valency electron, and ionization becomes positively charged molecular ion.If the interior of molecular ion can be bigger, it is possible to chemical bond rupture occurs, generate the less fragment ion of m/z.These ions and fragment enter mass analyzer under the guiding of electromagnetic field, utilize ion kinetic property in magnetic field or electric field, can by the ion of different mass-to-charge ratioes separately, then measured the intensity of ion stream by detector respectively, obtain specific mass spectrum, and molecular structure is different, mass spectrum is the most different, position according to peak can carry out qualitative and structural analysis, and the intensity at peak and number of ions are directly proportional, and obtain the quantitative information of sample according to this.
nullSee Fig. 1，After mass analyzer filters out the ion signal of needs，These ions enter at a high speed detector，Signal ion positively charged in detector is converted to electron stream，And by the original amplification of dynode array，Current pulse signal intensity after device amplifies after testing meets Gauss distribution，Signal width is then relevant with the charged ion number comprised in individual signals pulse，The pulse signal of detector output is received by detector signals collecting amplifying circuit and amplifies，And it is converted into the square-wave pulse signal easily detected by MCU，This square-wave pulse signal is counted by MCU module A4，One pulse is exactly a count value，The charged ion quantity that the size of count value and mass analyzer export is proportional，A charged ion is had just to have a count value theoretically，But owing to entering the ion Flow Velocity of detector quickly，Detector itself has the limitation in dead time，So detected charged ion and count value are not the most one-to-one relationships，But multiple ion pair answers a step-by-step counting，After MCU module has obtained the count value needed，These data are passed to host computer，Spectrogram is shown for host computer，And host computer carries out suitable buckle back scape as required and arranges.
In actually detected, certain signal to noise ratio can be there is, background noise is excessive or processes bad, will result directly in mass spectrum testing result, current domestic prior art, be substantially and by software algorithm, background noise be deducted, although major part has better effects, but still exist not convenient, flexibly, in real time, the feature such as effectively, it is therefore necessary to propose one and can facilitate, flexibly, and can effective method in real time.
Summary of the invention
In view of this, need to overcome at least one in drawbacks described above of the prior art.The invention provides a kind of mass spectrograph user adjustable detector signal processing component, including pre-amplification circuit, described pre-amplification circuit receives the pulse signal of detector output for mating, and amplifies for the first time；
Multistage amplifier circuit, described multistage amplifier circuit receives and amplifies signal for the first time from described pre-amplification circuit, and described first amplification signal is buffered, amplifies, buffers, amplifies, buffered, is then input to next stage circuit；
Described background deduction arranges circuit and includes audion that is that at least one plays comparator effect and that have on off state, receive the pulse signal from described multistage amplifier circuit, and by the regulation to the described triode switch state with on off state, by audion that is described that play comparator effect and that have on off state, prime signal being arranged a suitable thresholding, the signal from described multistage amplifier circuit exports next stage circuit after treatment simultaneously；
Waveform varying circuit, described waveform varying circuit is transformed into the square-wave pulse signal of the rule being prone to detected arranging circuit irregular sinusoidal wave pulse signal from described background deduction, and exports to next stage unit；
And increase driving force, reduce the signal output unit exporting impedance.
According in background of invention to described in prior art, at mass spectrograph, its final spectrogram provided the most all can be carried out context of software deduction at present, so that the peak value in corresponding spectrogram to obtain apparent manifesting, but still to there is the aspect such as convenient, flexible, real-time, effective in context of software deduction there is certain defect；And the hardware that uses that the present invention provides carries out the parts of background deduction, then can facilitate, flexibly and implement effectively final spectrogram to mass spectrograph offer and carry out the process of one-time-reach-place.
It addition, according to mass spectrograph user disclosed by the invention adjustable detector signal processing component also there is following additional technical feature:
Further, described pre-amplification circuit is audion total radio amplifier.
Further, described pre-amplification circuit is one-level audion total radio amplifier, and described one-level audion total radio amplifier is done direct current negative feedback by amplifier and arranges stable quiescent point.
Closer, described pre-amplification circuit is the audion total radio amplifier including audion (TR1), and the colelctor electrode of described audion (TR1) is connected with next stage circuit.
Further, described multistage amplifier circuit is audion multistage amplifier circuit.
Further, described audion multistage amplifier circuit includes the emitter follower audion (TR2) doing some phase compensations, and the base stage of described emitter follower audion (TR2) is connected with the colelctor electrode of described audion (TR1).
Further, described audion multistage amplifier circuit includes the emitter follower (TR6) doing phase compensation, described in do phase compensation the emitter stage of emitter follower (TR6) be connected to described background deduction circuit be set.
In described multistage amplifier circuit, emitter follower audion (TR2) is used as emitter follower and has done some phase compensations, and the emitter stage of emitter follower audion (TR2) is connected to the base stage of audion (TR3)；Audion (TR3) is one-level total radio amplifier, and arranging of its quiescent point is done direct current negative feedback realization by amplifier equally, is connected with the base stage of audion (TR4)；Audion (TR4) is an emitter follower, and after doing phase compensation, the emitter stage of audion (TR4) is connected with the base stage of audion (TR5)；Audion (TR5) is one-level total radio amplifier, and its quiescent point is arranged circuit by background deduction and does what direct current negative feedback was arranged, and the colelctor electrode of audion (TR5) is connected to do the base stage of the emitter follower (TR6) of phase compensation；The emitter follower (TR6) doing phase compensation is an emitter follower, and the emitter stage of the emitter follower (TR6) doing phase compensation after doing phase compensation is connected to background deduction and arranges circuit.
Further, described background deduction arranges circuit and includes at least one audion (TR7), described audion (TR7) is operated on off state, described on off state is by digital to analog converter control, described digital to analog converter is by MCU control, this digital to analog converter value having done in background deduction arranges circuit suitable computing to meet the needs of span of control, the base stage of described audion (TR7) is connected with the emitter stage of the described emitter follower (TR6) doing phase compensation.
Further, described waveform varying circuit includes having the audion (TR8) of on off state, Zener diode (D10), switching diode (D9), described in have on off state audion (TR8) colelctor electrode be attached to described signal output unit.
Further, described signal output unit includes emitter follower audion (TR9), the base stage of described emitter follower audion (TR9) and the described audion (TR8) with on off state colelctor electrode couple, described emitter follower audion (TR9) emitter stage is attached directly to MCU, exports square-wave pulse signal.
Aspect and advantage that the present invention adds will part be given in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will be apparent from easy to understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is to gather, to detector signal, the local principle of instrument block diagram that amplifying circuit is relevant；
Fig. 2 is that detector signal gathers amplifying circuit theory diagram；
Fig. 3 is that background deduction arranges examples of circuits figure；
Fig. 4 is that detector signal gathers one embodiment of amplifying circuit principle.
Wherein, B1 pre-amplification circuit, B2 multistage amplifier circuit, B3 background deduction arranges circuit, B4 waveform translation circuit, B5 signal output unit.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
In describing the invention, it will be appreciated that, term " on ", D score, " end ", " top ", "front", "rear", " interior ", " outward ", the orientation of the instruction such as "left", "right" or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " couples ", " connection ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, is integrally connected, it is also possible to be to removably connect；It can be the connection of two element internals；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.
The inventive concept of the present invention is as follows, as described in technical background, at mass spectrograph, its final spectrogram provided the most all can be carried out context of software deduction at present, so that the peak value in corresponding spectrogram to obtain apparent manifesting, but still to there is the aspect such as convenient, flexible, real-time, effective in context of software deduction there is certain defect；And the present invention provides uses the hardware method that carries out background deduction, then can facilitate, flexibly and implement effectively final spectrogram to mass spectrograph offer and carry out the process of one-time-reach-place.
Describing the mass spectrograph user adjustable detector signal processing component of the present invention below with reference to accompanying drawings, wherein Fig. 1 is to gather, to detector signal, the local principle of instrument block diagram that amplifying circuit is relevant；Fig. 2 is that detector signal gathers amplifying circuit theory diagram；Fig. 3 is that background deduction arranges examples of circuits figure.
According to embodiments of the invention, as shown in Figure 2,3, 4, the mass spectrograph user adjustable detector signal processing component that the present invention provides, pre-amplification circuit B1, described pre-amplification circuit B1 receives the pulse signal of detector output for mating, and amplifies for the first time；
Multistage amplifier circuit B2, described multistage amplifier circuit B2 receive and amplify signal for the first time from described pre-amplification circuit B1, and described first amplification signal is buffered, amplifies, buffers, amplifies, buffered, and are then input to next stage circuit；
Background deduction arranges circuit B3, described background deduction arranges circuit B3 and includes audion TR7 that is that at least one plays comparator effect and that have on off state, receive the pulse signal from described multistage amplifier circuit B2, and by the regulation to the described triode switch state with on off state, by audion that is described that play comparator effect and that have on off state, prime signal being arranged a suitable thresholding, the signal from described multistage amplifier circuit B2 exports next stage circuit after treatment simultaneously；
Waveform varying circuit B4, described waveform varying circuit B4 are transformed into the square-wave pulse signal of the rule being prone to detected arranging circuit B3 irregular sinusoidal wave pulse signal from described background deduction, and export to next stage unit；
And increase driving force, reduce the signal output unit B5 exporting impedance.
According in background of invention to described in prior art, routine techniques uses software to carry out background deduction, still there is the aspect such as convenient, flexible, real-time, effective and there is certain defect, and corresponding problem then can be effectively avoided in the use of hardware approach.
According to some embodiments of the invention, described pre-amplification circuit B1 is audion total radio amplifier.
Alternatively, described pre-amplification circuit B1 is one-level audion total radio amplifier, and described one-level audion total radio amplifier is done direct current negative feedback by amplifier and arranges stable quiescent point.
According to one embodiment of the invention, described pre-amplification circuit B1 is the audion total radio amplifier including audion (TR1), and the colelctor electrode of described audion (TR1) is connected with next stage circuit.
According to embodiments of the present invention, described multistage amplifier circuit B2 is audion multistage amplifier circuit.
According to some embodiments of the invention, described audion multistage amplifier circuit includes the emitter follower audion (TR2) doing some phase compensations, and the base stage of described emitter follower audion (TR2) is connected with the colelctor electrode of described audion (TR1).
According to embodiments of the present invention, described audion multistage amplifier circuit includes the emitter follower (TR6) doing phase compensation, described in do phase compensation the emitter stage of emitter follower (TR6) be connected to described background deduction circuit B3 be set.
According to one embodiment of present invention, as shown in Figure 4, in described multistage amplifier circuit B2, emitter follower audion (TR2) is used as emitter follower and has done some phase compensations, and the emitter stage of emitter follower audion (TR2) is connected to the base stage of audion (TR3)；Audion (TR3) is one-level total radio amplifier, and arranging of its quiescent point is done direct current negative feedback realization by amplifier equally, is connected with the base stage of audion (TR4)；Audion (TR4) is an emitter follower, and after doing phase compensation, the emitter stage of audion (TR4) is connected with the base stage of audion (TR5)；Audion (TR5) is one-level total radio amplifier, and its quiescent point is arranged circuit by background deduction and does what direct current negative feedback was arranged, and the colelctor electrode of audion (TR5) is connected to do the base stage of the emitter follower (TR6) of phase compensation；The emitter follower (TR6) doing phase compensation is an emitter follower, and the emitter stage of the emitter follower (TR6) doing phase compensation after doing phase compensation is connected to background deduction and arranges circuit.
According to embodiments of the invention, described background deduction arranges circuit B3 and includes at least one audion (TR7), described audion (TR7) is operated on off state, described on off state is by digital to analog converter control, described digital to analog converter is by MCU control, this digital to analog converter value having done in background deduction arranges circuit B3 suitable computing to meet the needs of span of control, the base stage of described audion (TR7) is connected with the emitter stage of the described emitter follower (TR6) doing phase compensation.
According to embodiments of the invention, by described comparator is carried out thresholding setting according to the baseline of host computer spectrogram.
Preferably, described thresholding arranges the baseline being placed so that in final collection of illustrative plates of the middle spectrogram described threshold value in described background deduction circuit B3 provided according to described host computer is 0.
According to embodiments of the invention, as shown in Figure 4, described waveform varying circuit B4 includes having the audion (TR8) of on off state, Zener diode (D10), switching diode (D9), described in have on off state audion (TR8) colelctor electrode be attached to described signal output unit.
According to embodiments of the invention, as shown in Figure 4, described signal output unit B5 includes emitter follower audion (TR9), the base stage of described emitter follower audion (TR9) and the described audion (TR8) with on off state colelctor electrode couple, described emitter follower audion (TR9) emitter stage is attached directly to MCU, exports square-wave pulse signal.
Although the detailed description of the invention of the present invention is described in detail by the multiple illustrative examples with reference to the present invention, it must be understood that, those skilled in the art can be designed that multiple other improvement and embodiment, these improve and embodiment will fall within spirit and scope.Specifically, within the scope of aforementioned disclosure, accompanying drawing and claim, rational modification and improvement can be made in terms of the layout of parts and/or sub-combination layout, without departing from the spirit of the present invention.Except the modification in terms of parts and/or layout and improvement, its scope is defined by the appended claims and the equivalents thereof.
Claims (10)
1. a mass spectrograph user adjustable detector signal processing component, it is characterised in that including:
Pre-amplification circuit, described pre-amplification circuit receives the pulse signal of detector output, and amplifies for the first time for mating；
Multistage amplifier circuit, described multistage amplifier circuit receives and amplifies signal for the first time from described pre-amplification circuit, and described first amplification signal is buffered, amplifies, buffers, amplifies, buffered, is then input to next stage circuit；
Background deduction arranges circuit, described background deduction arranges circuit and includes audion that is that at least one plays comparator effect and that have on off state, receive the pulse signal from described multistage amplifier circuit, and by the regulation to the described triode switch state with on off state, by audion that is described that play comparator effect and that have on off state, prime signal being arranged a suitable thresholding, the signal from described multistage amplifier circuit exports next stage circuit after treatment simultaneously；
Waveform varying circuit, described waveform varying circuit is transformed into the square-wave pulse signal of the rule being prone to detected arranging circuit irregular sinusoidal wave pulse signal from described background deduction, and exports to next stage unit；
And increase driving force, reduce the signal output unit exporting impedance.
Mass spectrograph user the most according to claim 1 adjustable detector signal processing component, it is characterised in that described pre-amplification circuit is audion total radio amplifier.
Mass spectrograph user the most according to claim 2 adjustable detector signal processing component, it is characterized in that, described pre-amplification circuit is one-level audion total radio amplifier, and described one-level audion total radio amplifier is done direct current negative feedback by amplifier and arranges stable quiescent point.
Mass spectrograph user the most according to claim 1 adjustable detector signal processing component, it is characterised in that described pre-amplification circuit is the audion total radio amplifier including audion TR1, the colelctor electrode of described audion TR1 is connected with next stage circuit.
Mass spectrograph user the most according to claim 1 adjustable detector signal processing component, it is characterised in that described multistage amplifier circuit is audion multistage amplifier circuit.
Mass spectrograph user the most according to claim 5 adjustable detector signal processing component, it is characterized in that, described audion multistage amplifier circuit includes the emitter follower audion TR2 doing some phase compensations, and the base stage of described emitter follower audion TR2 is connected with the colelctor electrode of described audion TR1.
Mass spectrograph user the most according to claim 5 adjustable detector signal processing component, it is characterized in that, described audion multistage amplifier circuit includes the emitter follower TR6 doing phase compensation, described in do phase compensation the emitter stage of emitter follower TR6 be connected to described background deduction circuit be set.
Mass spectrograph user the most according to claim 7 adjustable detector signal processing component, it is characterized in that, described background deduction arranges circuit and includes at least one audion TR7, described audion TR7 is operated on off state, described on off state is connected with the emitter stage of the described emitter follower TR6 doing phase compensation by digital to analog converter control, the base stage of described audion TR7.
Mass spectrograph user the most according to claim 1 adjustable detector signal processing component, it is characterized in that, described waveform varying circuit includes having the audion TR8 of on off state, Zener diode D10, switching diode D9, described in there is on off state the colelctor electrode of audion TR8 be attached to described signal output unit.
Mass spectrograph user the most according to claim 1 adjustable detector signal processing component, it is characterized in that, described signal output unit includes emitter follower audion TR9, the base stage of described emitter follower audion TR9 and the described audion TR8 with on off state colelctor electrode couple, described emitter follower audion TR9 emitter stage is attached directly to MCU, exports square-wave pulse signal.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112679A2 (en) * | 2008-04-25 | 2009-10-28 | Shimadzu Corporation | Method for Processing Mass Analysis Data and Mass Spectrometer |
| CN102789952A (en) * | 2011-05-19 | 2012-11-21 | 安徽中科大建成海晟科技有限责任公司 | Time-of-flight mass spectrometer electronics reading method based on pulse front edge time measurement and amplitude correction algorithm |
| CN204011360U (en) * | 2014-07-15 | 2014-12-10 | 江苏天瑞仪器股份有限公司 | The detector signal processing unit that a kind of mass spectrometer user is adjustable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02247555A (en) * | 1989-03-20 | 1990-10-03 | Hitachi Ltd | Pulse count type ion measuring method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2112679A2 (en) * | 2008-04-25 | 2009-10-28 | Shimadzu Corporation | Method for Processing Mass Analysis Data and Mass Spectrometer |
| CN102789952A (en) * | 2011-05-19 | 2012-11-21 | 安徽中科大建成海晟科技有限责任公司 | Time-of-flight mass spectrometer electronics reading method based on pulse front edge time measurement and amplitude correction algorithm |
| CN204011360U (en) * | 2014-07-15 | 2014-12-10 | 江苏天瑞仪器股份有限公司 | The detector signal processing unit that a kind of mass spectrometer user is adjustable |
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