CN108254619B - Method and device for detecting quantity of microwave frequency standard ions - Google Patents
Method and device for detecting quantity of microwave frequency standard ions Download PDFInfo
- Publication number
- CN108254619B CN108254619B CN201711273698.4A CN201711273698A CN108254619B CN 108254619 B CN108254619 B CN 108254619B CN 201711273698 A CN201711273698 A CN 201711273698A CN 108254619 B CN108254619 B CN 108254619B
- Authority
- CN
- China
- Prior art keywords
- frequency
- detection signal
- ions
- ion trap
- linear ion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Electron Tubes For Measurement (AREA)
Abstract
The application discloses a method and a device for detecting the quantity of microwave frequency standard ions, which solve the problems that the detection precision of the quantity of the microwave frequency standard ions is low, the difficulty is high, the reaction to the ions is not sensitive enough, and the integration and the miniaturization are not facilitated in the prior art. The detection method comprises the steps of calculating the slow motion frequency of ions according to an electric potential distribution equation in the quadrupole linear ion trap, determining the central frequency of a detection signal as the slow motion frequency, wherein the scanning range is +/-10 kHz, loading the detection signal to an end electrode of the quadrupole linear ion trap, and grounding the other end electrode of the quadrupole linear ion trap. The input frequency of the detection signal is absorbed at the quadrupole linear ion trap and the ion population is calculated from the transmission spectrum. During detection, the computer controls the crystal oscillator to generate a detection signal, the detection signal is filtered and amplified and then is input into the quadrupole linear ion trap through the voltage dividing resistor, the input frequency is absorbed by ions in the ion trap and then is output as a transmission signal, and the transmission signal is filtered and phase-locked and amplified with the detection signal and is transmitted to the computer for processing.
Description
Technical Field
The application relates to the field of electromagnetic fields, in particular to a method and a device for detecting the quantity of microwave frequency standard ions.
Background
The mercury ion microwave frequency standard is a novel frequency standard, and adopts a brand new working principle different from the traditional atomic frequency standards of hydrogen, rubidium, cesium and the like. The method has the inherent characteristics of no disturbance of material particles and external fields, small motion effect, long quantum state coherence time and the like, and has extremely narrow spectral line width and small frequency shifts. One of the main reasons is that working ions are trapped in the center of the ion trap in ultrahigh vacuum by applying an electrostatic field, a magnetic field or a radio frequency field to the ion trap, so that the ions are completely isolated and are in a completely static state without being interfered by the outside, and the performance index of the mercury ion microwave frequency standard can be greatly improved. However, the prior art is not deeply researched for the mercury ion microwave frequency standard quantity detection method, and generally, the mercury ion microwave frequency standard quantity detection method can only be used for simple test through the existing instruments and equipment. The detection method has the problems of low detection precision, high difficulty, low sensitivity to ion reaction and inconvenience for integration and miniaturization.
Therefore, the application provides a novel method and a device for detecting the quantity of the microwave frequency standard ions, and solves the problems that the existing method for detecting the quantity of the mercury ion microwave frequency standard ions is low in precision, large in detection difficulty, difficult to miniaturize the system and the like.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting the quantity of microwave frequency standard ions, which are used for solving the problems of low precision, high detection difficulty and the like in the prior art for detecting the quantity of mercury ion microwave frequency standard ions. The detection method comprises the following steps:
and (3) calculating the slow motion frequency of ions according to an electric potential distribution equation in the quadrupole linear ion trap, determining the central frequency of a detection signal as the slow motion frequency according to the ion motion frequency, and setting the scanning range as +/-10 kHz. And loading the detection signal to one end electrode of the quadrupole linear ion trap, and grounding the other end electrode. The input frequency of the detection signal is absorbed at the quadrupole linear ion trap and the ion population is calculated from the transmission spectrum.
Preferably, the microwave frequency standard is a mercury ion microwave frequency standard.
Preferably, the formula for calculating the ion number according to the transmission spectrum is as follows:
where b is the circuit constant, d0The distance from the end electrode to the center of the trap, f is the trapping field frequency, R is the resistance value, 1/R0For detection of resonant admittance of the circuit, YmaxAnd Δ ω is the peak and full width at half maximum, respectively, of the rf detection signal absorption curve, and N is the ion number.
The embodiment of the application also provides a device for detecting the quantity of the microwave frequency standard ions, which is suitable for the method for detecting the quantity of the microwave frequency standard ions, and solves the problem that the system in the prior art is difficult to miniaturize.
The device adopts the following technical scheme:
a device for detecting the quantity of microwave frequency standard ions comprises a computer, a crystal oscillator, a filter amplifier, a voltage dividing resistor, a quadrupole linear ion trap, a filter and a phase-locked amplifier. The crystal oscillator is used for generating a detection signal and comprises a control end, an output end and a phase-locked end, the computer is connected with the control end of the crystal oscillator, and the output end of the crystal oscillator is connected with the input end of the filter amplifier. The filter amplifier filters and amplifies the detection signal; one end of the divider resistor is connected with the filter amplifier, the other end of the divider resistor is connected with the quadrupole linear ion trap, and the detection signal is input into the end electrode of the quadrupole linear ion trap through the divider resistor. Ions in the quadrupole linear ion trap absorb the detection signal, and the transmission signal is filtered by the filter. The phase-locked amplifier is connected with the phase-locked end of the crystal oscillator, the filter and the computer. The transmission signal filtered by the filter and the detection signal provided by the crystal oscillator are subjected to phase-locked amplification in the phase-locked amplifier, and the obtained transmission spectrum is transmitted to a computer through an output end. The computer is used for controlling the output frequency of the crystal oscillator, the slow motion frequency of the ions is taken as the central frequency and is changed within the range of +/-10 kHz, and the computer is also used for calculating the number of the ions according to the transmission spectrum.
Preferably, the quadrupole line type ion trap comprises column electrodes and end electrodes.
Preferably, the voltage amplitude of the column electrode is between 300V and 2000V.
Preferably, the loading frequency required by the column electrode is between 1MHz and 6 MHz.
Preferably, the end electrode needs to be loaded with a direct current voltage with the voltage amplitude of 5V-300V.
Preferably, the step of calculating the number of ions from the transmission spectrum by the computer is
Where b is the circuit constant, d0The distance from the end electrode to the center of the trap, f is the trapping field frequency, R is the resistance value, 1/R0For detection of resonant admittance of the circuit, YmaxAnd Δ ω is the peak and full width at half maximum, respectively, of the rf detection signal absorption curve, and N is the ion number.
Preferably, the frequency of the slow motion of the ions is 50 kHz.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects: the method and the device for detecting the quantity of the microwave frequency standard ions have the advantages of high precision, sensitive ion response and convenience for integration and miniaturization.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a method for detecting the number of microwave frequency standard ions according to an embodiment of the present disclosure.
Fig. 2 is a structural diagram of a quadrupole line type ion trap according to an embodiment of the present application.
Fig. 3 is a flowchart of an apparatus for detecting the amount of ions in a microwave frequency standard according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting the number of microwave frequency standard ions according to an embodiment of the present disclosure. As shown in fig. 1, the method for detecting the amount of microwave frequency standard ions provided in the embodiment of the present application includes the following 4 steps:
Solving the potential distribution in the quadrupole linear ion trap according to the formula (1)
Wherein VrfAnd ωrfAmplitude and circular frequency, U, of the applied alternating electric field, respectivelydcIs a DC bias part of an applied electric field, r0The shortest distance from the center of the well to the surface of the well electrode.
Solving equation of plane motion with positive ions according to formula (2)
Wherein
ζ＝ωrft/2, m is the ion mass, and e is the charge value of the electron.
Solving for the frequency of motion of ions in a quadrupole linear ion trap according to equation (3), using the x-axis as an example
Wherein
For slow motion frequency, omegarfIs a fast motion frequency.
Where N is the total number of ions, b and d are circuit constants0The distance from the end electrode to the center of the trap, f is the trapping field frequency, R is the resistance value, 1/R0For detection of resonant admittance of the circuit, YmaxAnd Δ ω is the peak and full width at half maximum, respectively, of the rf detection signal absorption curve.
The detection method for the number of the microwave frequency standard ions provided by the embodiment of the application has the advantages of small detection difficulty and high precision.
Fig. 2 is a structural diagram of a quadrupole line type ion trap according to an embodiment of the present application. As shown in FIG. 2, the quadrupole line type ion trap provided by the application comprises column electrodes and end electrodes, wherein the voltage amplitude of the column electrodes of the ion trap is between 300V and 2000V, and the required loading frequency is between 1MHz and 6 MHz. The electrode at the ion trap end needs to be loaded with direct current voltage with the voltage amplitude of 5V-300V.
Fig. 3 is a flowchart of an apparatus for detecting the amount of ions in a microwave frequency standard according to an embodiment of the present disclosure. As shown in fig. 3, the apparatus for detecting the amount of ions in a microwave frequency standard according to the embodiment of the present invention includes a computer 1, a crystal oscillator 2, a filter amplifier 3, a voltage dividing resistor 4, a quadrupole ion trap 5, a filter 6, and a lock-in amplifier 7. The crystal oscillator 2 is used for generating a detection signal and comprises a control end, an output end and a phase-locked end. The computer 1 is connected with the control end of the crystal oscillator 2, and the output end of the crystal oscillator 2 is connected with the input end of the filter amplifier 3. The filter amplifier 3 is used for filtering and amplifying the detection signal output by the crystal oscillator 2. One end of the divider resistor 4 is connected with the filter amplifier 3, and the other end is connected with the quadrupole linear ion trap 5. The detection signal processed by the filter amplifier 3 is input to the terminal electrode of the quadrupole linear ion trap 5 through the voltage dividing resistor 4. Ions in the quadrupole linear ion trap 5 absorb the detection signal and the transmission signal is filtered by the filter 6. The lock-in amplifier 7 is connected with the phase-locked end of the crystal oscillator 2, the filter 6 and the computer 1. The transmission signal filtered by the filter 6 and the detection signal provided by the crystal oscillator 2 are phase-locked and amplified in the phase-locked amplifier 7, and the obtained transmission spectrum is transmitted to the computer 1 through an output end. The computer 1 is used for controlling the output frequency of the crystal oscillator 2, and the frequency is changed within the range of +/-10 kHz by taking the slow motion frequency of ions as a center.
In one implementation of the above-described embodiment of the present application, the computer 1 controls the crystal oscillator 2 to output a detection signal having a center frequency of 50kHz and a bandwidth of 10 kHz. The detection signal is output from the output end of the crystal oscillator 2 to the filter amplifier 3 for filtering and amplifying, and then is loaded to the end electrode of the quadrupole linear ion trap 5 through the divider resistor 4. The transmission signal is output after the ion absorption part in the quadrupole linear ion trap 5 detects the signal, the filter 6 filters the fast motion frequency in the transmission signal, then the phase-locked amplification is carried out through the phase-locked amplifier 7, finally the transmission spectrum is transmitted back to the computer 1, and the computer 1 calculates through the formula (4) to obtain the ion quantity in the quadrupole linear ion trap 5.
Claims (7)
1. A method for detecting the quantity of microwave frequency standard ions is characterized by comprising the following steps:
calculating the slow motion frequency of the ions according to an electric potential distribution equation in the quadrupole linear ion trap;
determining the central frequency of the detection signal as a slow motion frequency according to the ion motion frequency, wherein the scanning range is +/-10 kHz;
loading the detection signal to one end electrode of the quadrupole linear ion trap, and grounding the other end electrode;
the input frequency of the detection signal is absorbed at the quadrupole linear ion trap and the ion population is calculated from the transmission spectrum:
2. The method for detecting the amount of the microwave standard ions according to claim 1, wherein the microwave standard is a mercury ion microwave standard.
3. A device for detecting the quantity of microwave frequency standard ions is characterized by comprising a computer, a crystal oscillator, a filter amplifier, a divider resistor, a quadrupole linear ion trap, a filter and a phase-locked amplifier;
the quadrupole linear ion trap comprises a column electrode and an end electrode;
the crystal oscillator is used for generating a detection signal and comprises a control end, an output end and a phase-locked end, the computer is connected with the control end of the crystal oscillator, and the output end of the crystal oscillator is connected with the input end of the filter amplifier;
the filter amplifier filters and amplifies the detection signal;
one end of the voltage dividing resistor is connected with the filter amplifier, the other end of the voltage dividing resistor is connected with the quadrupole linear ion trap, and the detection signal is input into an end electrode of the quadrupole linear ion trap through the voltage dividing resistor;
ions in the quadrupole linear ion trap absorb the detection signal, and the transmission signal is filtered by a filter;
the phase-locked amplifier is connected with a phase-locked end of the crystal oscillator, a filter and a computer;
the transmission signal filtered by the filter and the detection signal provided by the crystal oscillator are subjected to phase-locked amplification in the phase-locked amplifier, and the obtained transmission spectrum is transmitted to a computer through an output end;
the computer is used for controlling the output frequency of the crystal oscillator, the frequency changes within the range of +/-10 kHz by taking the slow motion frequency of ions as a center, and the computer is also used for calculating the quantity of the ions according to the transmission spectrum:
where b is the circuit constant, d0The distance from the end electrode to the center of the trap, f is the trapping field frequency, R is the resistance value, 1/R0For detection of resonant admittance of the circuit, YmaxAnd Δ ω is the peak and full width at half maximum of the rf detection signal absorption curve, N is the ion number, m is the ion mass, and e is the charge value of the electrons, respectively.
4. The apparatus for detecting the amount of microwave frequency standard ions according to claim 3, wherein the voltage amplitude of the column electrode is between 300V and 2000V.
5. The apparatus for detecting the amount of microwave frequency standard ions according to claim 3, wherein the loading frequency required for the column electrode is between 1MHz and 6 MHz.
6. The apparatus for detecting the amount of microwave frequency standard ions according to claim 3, wherein the terminal electrode is applied with a DC voltage having a voltage amplitude of 5V to 300V.
7. The apparatus for detecting the amount of microwave frequency standard ions according to claim 3, wherein the frequency of the slow motion of the ions is 50 kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273698.4A CN108254619B (en) | 2017-12-06 | 2017-12-06 | Method and device for detecting quantity of microwave frequency standard ions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273698.4A CN108254619B (en) | 2017-12-06 | 2017-12-06 | Method and device for detecting quantity of microwave frequency standard ions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108254619A CN108254619A (en) | 2018-07-06 |
| CN108254619B true CN108254619B (en) | 2020-07-17 |
Family
ID=62722455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711273698.4A Active CN108254619B (en) | 2017-12-06 | 2017-12-06 | Method and device for detecting quantity of microwave frequency standard ions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254619B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582248B (en) * | 2020-12-14 | 2023-09-12 | 北京无线电计量测试研究所 | Electron gun device for mercury ion microwave frequency standard |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553174A (en) * | 2003-12-18 | 2004-12-08 | 中国科学院武汉物理与数学研究所 | Detection device and detection method for radio frequency resonance absorption signal of linear ion trap |
| CN101369510A (en) * | 2008-09-27 | 2009-02-18 | 复旦大学 | Annular Tubular Electrode Ion Trap |
| CN101578684A (en) * | 2006-11-13 | 2009-11-11 | 布鲁克机械公司 | Electrostatic ion trap |
| CN104766780A (en) * | 2015-03-20 | 2015-07-08 | 复旦大学 | A Method for Efficient and Fast Analysis in Ion Trap Mass Analyzer |
| CN105953917A (en) * | 2016-05-12 | 2016-09-21 | 中国科学院武汉物理与数学研究所 | Differential signal discrimination circuit for mercury ion microwave frequency standard fluorescent detection |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001093462A (en) * | 1999-09-21 | 2001-04-06 | Shimadzu Corp | Ion trapping type mass spectroscope |
| US6710336B2 (en) * | 2002-01-30 | 2004-03-23 | Varian, Inc. | Ion trap mass spectrometer using pre-calculated waveforms for ion isolation and collision induced dissociation |
| US6987261B2 (en) * | 2003-01-24 | 2006-01-17 | Thermo Finnigan Llc | Controlling ion populations in a mass analyzer |
| CN103000484A (en) * | 2012-12-12 | 2013-03-27 | 上海斯善质谱仪器有限公司 | Mass spectrum analyzer and analyzing method thereof |
| WO2014164198A1 (en) * | 2013-03-11 | 2014-10-09 | David Rafferty | Automatic gain control with defocusing lens |
-
2017
- 2017-12-06 CN CN201711273698.4A patent/CN108254619B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553174A (en) * | 2003-12-18 | 2004-12-08 | 中国科学院武汉物理与数学研究所 | Detection device and detection method for radio frequency resonance absorption signal of linear ion trap |
| CN101578684A (en) * | 2006-11-13 | 2009-11-11 | 布鲁克机械公司 | Electrostatic ion trap |
| CN101369510A (en) * | 2008-09-27 | 2009-02-18 | 复旦大学 | Annular Tubular Electrode Ion Trap |
| CN104766780A (en) * | 2015-03-20 | 2015-07-08 | 复旦大学 | A Method for Efficient and Fast Analysis in Ion Trap Mass Analyzer |
| CN105953917A (en) * | 2016-05-12 | 2016-09-21 | 中国科学院武汉物理与数学研究所 | Differential signal discrimination circuit for mercury ion microwave frequency standard fluorescent detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108254619A (en) | 2018-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Caravatti et al. | The ‘infinity cell’: A new trapped‐ion cell with radiofrequency covered trapping electrodes for Fourier transform ion cyclotron resonance mass spectrometry | |
| US3475605A (en) | Ion cyclotron double resonance spectrometer employing a series connection of the irradiating and observing rf sources to the cell | |
| US6714033B1 (en) | Probe for direct wafer potential measurements | |
| JPH10509557A (en) | Method and apparatus for measuring ion flow in plasma | |
| US8563925B2 (en) | Mass spectroscope and its adjusting method | |
| Annaratone et al. | A comparison of a passive (filtered) and an active (driven) probe for RF plasma diagnostics | |
| CN108254619B (en) | Method and device for detecting quantity of microwave frequency standard ions | |
| JPH02301952A (en) | Outside correction method of ion cyclotron resonance mass spectrometer | |
| Flender et al. | RF harmonic suppression in Langmuir probe measurements in RF discharges | |
| Makarov et al. | Fundamentals of Orbitrap analyzer | |
| Everhart et al. | The admittance of high frequency gas discharges | |
| US3621464A (en) | Amplitude modulated rf generator for quadrupole mass analyzer | |
| US2581305A (en) | Detection of electrically charged particles | |
| CN106788427A (en) | One kind imprisons radio frequency source for mercury ion Microwave Frequency target | |
| EP2591482A1 (en) | Capacitor assembly for a mass spectrometer | |
| Chu et al. | Quasiperiodic transition to spatiotemporal chaos in weakly ionized magnetoplasmas | |
| Lin et al. | A gain and bandwidth enhanced transimpedance preamplifier for Fourier-transform ion cyclotron resonance mass spectrometry | |
| US11195707B2 (en) | Time-of-flight mass spectrometry device | |
| US10651020B2 (en) | Capacitors and radio frequency generators and other devices using them | |
| US2813997A (en) | Electron discharge device | |
| Marmet et al. | A frequency-swept quadrupole mass filter | |
| Metcalf et al. | A New Low Noise Vacuum Tube | |
| Jaeschke et al. | A nanosecond-pulsing system for heavy ions with a HVEC tandem accelerator | |
| US2474773A (en) | Radiation detector | |
| JPS6052389B2 (en) | Atomic beam detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |