CN201788941U - Filament emission current stabilizing control circuit in mass spectrograph - Google Patents
Filament emission current stabilizing control circuit in mass spectrograph Download PDFInfo
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- CN201788941U CN201788941U CN201020281323XU CN201020281323U CN201788941U CN 201788941 U CN201788941 U CN 201788941U CN 201020281323X U CN201020281323X U CN 201020281323XU CN 201020281323 U CN201020281323 U CN 201020281323U CN 201788941 U CN201788941 U CN 201788941U
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Abstract
The utility model discloses a filament emission current stabilizing control circuit in a mass spectrograph, which comprises a comparator A and a comparator B, wherein the comparator A is connected with a capacitor C26, a resistor R35, a capacitor C37, a resistor R34, a resistor R24 and a resistor R23, the comparator A is connected with an optical coupler PC6 through a triode Q8, one input end of the optical coupler PC6 is connected with a resistor R39, the comparator A is also connected to a filament emission current collection control module, the comparator B is connected with a diode D14, a capacitor C32 and a resistor R36, the comparator B and the comparator A are mutually connected, the comparator B is connected with an optical coupler PC4, one input end of the optical coupler PC4 is connected with a resistor R27, one output end of the optical coupler PC4 is connected with a compound tube through a resistor R38, the compound tube is connected to the filament emitting current collection control module, and the filament emitting current collection control module is also connected with one input end of the optical coupler PC4. The filament emission current stabilizing control circuit can be used for automatically stabilizing the filament emitting current.
Description
Technical field
The utility model relates to the mass spectrometer field, is specifically related to filament emission current stabilization control circuit in a kind of mass spectrometer.
Background technology
Mass spectrometer claims mass spectrograph again, a kind of separation with detect different isotopic instruments, promptly according to charged particle can deflection in electromagnetic field principle, by the quasi-instrument that the mass discrepancy of material atom, molecule or molecular fragment is separated and detection material is formed.Mass spectrometer is a core with ion source, mass analyzer and ion detector.Ion source is to make sample molecule Ionized device under high vacuum condition.Molecule after the ionization is because of having accepted multiple fragment ion and the neutral particle that too much energy can further be fragmented into less quality.They obtain the mean kinetic energy with identical energy and enter mass analyzer under the accelerating field effect.Mass analyzer is to enter the ion of different quality wherein simultaneously, by the device of mass-to-charge ratio m/z size separation.Ion after the separation enters ion detector successively, gathers and amplifies ion signal, and machine is handled as calculated, is depicted as mass spectrogram.Ion source, mass analyzer and ion detector all respectively have polytype.Mass spectrometer is divided into isotope mass spectrometer, inorganic mass spectrometer and organic mass spectrometer by range of application; Be divided into high-resolution, middle resolution and Low Resolution Mass Spectra instrument by resolving power; Be divided into static instrument and dynamic instrument by operation principle.
EI source (electron impact ion source) is organic mass spectrometer a kind of ion source commonly used, after the sample molecule after the gasification enters chamber, is subjected to the bombardment generation cation by the electron stream of tungsten or rhenium filament emission and acceleration.Chamber pressure remains on 10-4～10-6mmHg.The energy of bombardment electronics makes ionized sample molecule or cracked greater than the ionization energy of sample molecule.Electron impact mass spectra can provide organic compounds abundant structures information, and reappearance is preferably arranged, and the research of its cracking rule is also perfect, and the standard spectrum picture library of having set up tens thousand of kinds of organic compounds can be for retrieval.
Generally all be the electron stream that collects to be handled give analog to digital converter afterwards in the existing technology, change into digital signal and give MCU again, after judging, remove to control the electric current on the filament again, reach the purpose of stablizing electron stream, so not only increased the workload of hardware designs and software design, and in control also defectiveness:
1, the voltage on the filament is in time adjusted in the variation according to electron stream that can not be real-time.
2, electron stream own is exactly very faint, and generally about tens microamperes, the electron stream that collects is amplifying, and may introduce some in the analog-to-digital process and disturb, and causes the error judged,
3, need the user when setting reference voltage, to go to consider the aging conditions of filament, because its electron emission ability can die down when filament was aging, under same voltage, aging filament electronic emissivities can be more far short of what is expected than the electron emissivity of new filament, and therefore independent is to obtain a stable emission current to a magnitude of voltage.
The EI source is the source that sample ions produces, and its stability is directly connected to the stable of instrument signal.And therefore stable the stable of ion source flow of emitted electrons that can guarantee of filament emission current design a kind of reliable filament emission current stabilization control circuit, and apparent is particularly important.
The utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide filament emission current stabilization control circuit in a kind of mass spectrometer, this control circuit only need be set the value of a filament emission voltage, the filament emission current stabilization control circuit just can be by the electron stream that collects size and set point between compare, control the stable of emission current automatically.
For solving the problems of the technologies described above, realize above-mentioned technique effect, the utility model adopts following technical scheme:
The filament emission current stabilization control circuit comprises in a kind of mass spectrometer,
Comparator A, described comparator A is connected with capacitor C 26, resistance R 35, capacitor C 37, resistance R 34, resistance R 24 and resistance R 23;
Described comparator A is connected with optocoupler PC6 by triode Q8, and described optocoupler PC6 one input is connected with resistance R 39;
Described comparator A also is connected to a filament emission current acquisition control module, and described filament emission current acquisition control module is used to gather the control of the emission current of filament with auxiliary filament emission current stabilization control circuit of the present utility model;
Comparator B, described comparator B is connected with diode D14, capacitor C 32, resistance R 36;
Described comparator B and described comparator A interconnect;
Described comparator B connects an optocoupler PC4, the input of described optocoupler PC4 is connected with resistance R 27, the output of described optocoupler PC4 connects a multiple tube by resistance R 38, described multiple tube is connected to filament emission current acquisition control module 1, and described filament emission current acquisition control module 1 also is connected the input of described optocoupler PC4.
Further, described multiple tube comprises a triode Q7, and the collector electrode of described triode Q7 connects the base stage of a triode Q6, and the emitter of the collector electrode of described triode Q6 and triode Q7 is connected to the base stage of described triode Q7 by resistance R 37.
Stabilization control circuit of the present utility model is as follows to the stable control process of filament emission current:
Voltage V1 of default, described filament emission current is stablized control module and V1 and the filament emission current that collects value V2 can be compared, if V1＞V2, then this system just can increase the pressure drop of the input of described optocoupler PC4, the pressure drop increase of described optocoupler PC4 input can increase the electric current that its output passes through, and by the voltage on described triode Q6, the Q7 increase filament, improves the filament electron emission ability then, V2 will become greatly, till V1=V2; Otherwise, if V1＜V2 then described optocoupler PC4 (501) can turn-off, will not have voltage on the filament, this moment, emission current V2=0 met first kind of state so V1＞V2 sets up.
Compared with prior art, the utlity model has following advantage:
The control of filament emission current is all finished automatically, response speed is fast, need not the participation of MCU, analog to digital converter and software, only need to set the value of a filament emission current, the filament emission current stabilizing circuit just can be by the electron stream that collects size and set point between form relatively, control the stable of emission current automatically.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and conjunction with figs. describe in detail as after.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the present utility model.
Number in the figure explanation: 1. filament emission current acquisition control module.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
See also shown in Figure 1ly, the filament emission current stabilization control circuit comprises in a kind of mass spectrometer,
Comparator A, described comparator A is connected with capacitor C 26, resistance R 35, capacitor C 37, resistance R 34, resistance R 24 and resistance R 23;
Described comparator A is connected with optocoupler PC6 by triode Q8, and described optocoupler PC6 one input is connected with resistance R 39;
Described comparator A also is connected to a filament emission current acquisition control module 1, and described filament emission current acquisition control module 1 is used to gather the control of the emission current of filament with auxiliary filament emission current stabilization control circuit of the present utility model;
Comparator B, described comparator B is connected with diode D14, capacitor C 32, resistance R 36;
Described comparator B and described comparator A interconnect;
Described comparator B connects an optocoupler PC4, and the input of described optocoupler PC4 is connected with resistance R 27, and the output of described optocoupler PC4 connects a multiple tube by resistance R 38, and described multiple tube is connected to the filament emission current circuit part.
Further, described multiple tube comprises a triode Q7, and the collector electrode of described triode Q7 connects the base stage of a triode Q6, and the emitter of the collector electrode of described triode Q6 and triode Q7 is connected to the base stage of described triode Q7 by resistance R 37.
The filament emission current stabilization control circuit is a kind of closed-loop control system, and master control borad is given magnitude of voltage V1 of this system by DA chip (digital signal analog signal conversion chip), and this magnitude of voltage is being represented the filament emission current size that needs.This control circuit can compare V1 and the filament emission current that collects value V2, if V1＞V2, then this system just can increase the pressure drop of the input of optocoupler PC4, the pressure drop increase of optocoupler PC4 input can increase the electric current that its output passes through, then by the voltage on triode Q6, the Q7 increase filament, improve the filament electron emission ability, V2 will become greatly, till V1=V2.Otherwise, if V1＜V2 then optocoupler PC4 can turn-off, will not have voltage on the filament, this moment, emission current V2=0 met first kind of state so V1＞V2 sets up.
The benefit of this control is the automatic convergence user's of emission current value meeting of filament set point, and need not the user removes to consider filament when setting aging conditions, because its electron emission ability can die down when filament was aging, under same voltage, the electron emissivity of the aging new filament of filament electronic emissivities meeting is far short of what is expected, and therefore independent is to obtain a stable emission current to a magnitude of voltage.
More than in the mass spectrometer that the utility model embodiment is provided the filament emission current stabilization control circuit be described in detail; for one of ordinary skill in the art; thought according to the utility model embodiment; the part that all can change in specific embodiments and applications, therefore all any changes of being made according to the utility model design philosophy are all within protection range of the present utility model.
Claims (2)
1. filament emission current stabilization control circuit in the mass spectrometer is characterized in that: comprises,
One comparator A, described comparator A is connected with capacitor C 26, resistance R 35, capacitor C 37, resistance R 34, resistance R 24 and resistance R 23; Described comparator A is connected with optocoupler PC6 by triode Q8, and described optocoupler PC6 one input is connected with resistance R 39; Described comparator A also is connected to filament emission current acquisition control module (1);
One comparator B, described comparator B is connected with diode D14, capacitor C 32, resistance R 36; Described comparator B and described comparator A interconnect; Described comparator B connects an optocoupler PC4, the input of described optocoupler PC4 is connected with resistance R 27, the output of described optocoupler PC4 connects a multiple tube by resistance R 38, described multiple tube is connected to described filament emission current acquisition control module (1), and described filament emission current acquisition control module (1) also is connected the input of described optocoupler PC4.
2. filament emission current stabilization control circuit in the mass spectrometer according to claim 1, it is characterized in that: described multiple tube comprises a triode Q7, the collector electrode of described triode Q7 connects the base stage of a triode Q6, and the emitter of the collector electrode of described triode Q6 and triode Q7 is connected to the base stage of described triode Q7 by resistance R 37.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020281323XU CN201788941U (en) | 2010-08-04 | 2010-08-04 | Filament emission current stabilizing control circuit in mass spectrograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020281323XU CN201788941U (en) | 2010-08-04 | 2010-08-04 | Filament emission current stabilizing control circuit in mass spectrograph |
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| Publication Number | Publication Date |
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| CN201788941U true CN201788941U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020281323XU Expired - Lifetime CN201788941U (en) | 2010-08-04 | 2010-08-04 | Filament emission current stabilizing control circuit in mass spectrograph |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347198A (en) * | 2010-08-04 | 2012-02-08 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN103471301A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Constant refrigeration control circuit of handheld X-ray fluorescence spectrometer |
-
2010
- 2010-08-04 CN CN201020281323XU patent/CN201788941U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347198A (en) * | 2010-08-04 | 2012-02-08 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN102347198B (en) * | 2010-08-04 | 2014-05-21 | 江苏天瑞仪器股份有限公司 | Filament emission current stabilization control circuit in mass spectrometer |
| CN103471301A (en) * | 2013-09-03 | 2013-12-25 | 周健 | Constant refrigeration control circuit of handheld X-ray fluorescence spectrometer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110406 Effective date of abandoning: 20140521 |
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| RGAV | Abandon patent right to avoid regrant |