CN2589978Y - High-resolution quadrupole mass spectrometer - Google Patents

High-resolution quadrupole mass spectrometer Download PDF

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Publication number
CN2589978Y
CN2589978Y CN 02250723 CN02250723U CN2589978Y CN 2589978 Y CN2589978 Y CN 2589978Y CN 02250723 CN02250723 CN 02250723 CN 02250723 U CN02250723 U CN 02250723U CN 2589978 Y CN2589978 Y CN 2589978Y
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CN
China
Prior art keywords
quadrupole mass
digital
mass spectrometer
amplifier
signal
Prior art date
Application number
CN 02250723
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Chinese (zh)
Inventor
姚若河
Original Assignee
华南理工大学
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Priority to CN 02250723 priority Critical patent/CN2589978Y/en
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Publication of CN2589978Y publication Critical patent/CN2589978Y/en

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Abstract

The utility model relates to a testing technology, particularly a high-resolution quadrupole mass spectrometer, which comprises a sample feeding system, an ion source (an ionizing chamber), a quadrupole mass filter, a faraday box, a preamplifier and an amplifier which are connected successively. The utility model is characterized in that a signal processing board is connected between the preamplifier and the amplifier; the signal processing board is composed of an analog-digital converter, a digital signal processor, an optoelectronic isolator and a digital-analog converter which are connected. The utility model utilizes a signal processing technology to enhance the resolution of a mass spectrometer.

Description

The high resolving power quadrupole mass spectrometer

Technical field

The utility model relates to measuring technology, in more detail the high resolving power quadrupole mass spectrometer.

Background technology

Mass spectrograph is a kind of analytical instrument that is widely used in fields such as chemistry, chemical industry, oil, geology, metallurgy, material, medical and health and environmental science.Fig. 1 is existing quadrupole mass spectrometer structural representation.As shown in the figure, connect and compose successively by sampling system, ion gun (ionization chamber), quadrupole mass filter, faraday cell, prime amplifier, amplifier, sample is ionized into ion through sampling system at ionization chamber, by quadrupole mass filter ion is separated by the size of mass-to-charge ratio (m/z) again; Faraday cell is a kind of detecting device, and ion flow is directly accepted to produce electric current by the metal electrode of faraday cell by slit, exports corresponding mass signal through the amplification of prime amplifier and amplifier again.

Wherein quadrupole mass filter is made up of four cylindrical electrodes, and it is connected to form two groups to corner electrode, and the mass separation of ion is carried out in the quadripolar electric field that electrode forms.On pair of electrodes, add DC voltage V DcWith alternating voltage V Ac, another is to making alive V on the electrode Rf+ V DcV wherein Ac=V 0Cos (ω t) is at certain V Dc, V 0During with ω, have only the ion of certain mass-to-charge ratio to arrive gatherer and output signal by electric field region smoothly, these ions are called resonance plasma, and other ion (off-resonance ion) impinges upon on the cylindrical electrode in the process of motion and taken away by vacuum pump at last.Change electrical quantity (V Dc, V 0And ω) ion that just can make different quality finally obtains corresponding mass spectrogram at output terminal successively by quadrupole mass filter.

Resolution is an important performance indexes of mass spectrograph, refers to the ability that mass spectrograph separates adjacent two quality, represents with R usually.Its definition is: if certain mass spectrograph can just separate two mass spectra peaks that quality is M and M+ Δ M, then the resolution of this mass spectrograph is R=M/ Δ M.

For quadrupole mass spectrometer, its resolution is the ion function of the rf period of tiding in electric field, and the approach that improves its resolution usually is to increase electrode length, but this method is subjected to the restriction of physics, and the length of general electrode is 5-20cm.Therefore the raising of its resolution has certain limitation.

The utility model purpose

The purpose of this utility model is to provide a kind of high resolving power quadrupole mass spectrometer at the problem of prior art existence, utilizes signal processing technology, improves the resolution of mass spectrograph.

High resolving power quadrupole mass spectrometer of the present utility model comprises that sampling system, ion gun (ionization chamber), quadrupole mass filter, faraday cell, prime amplifier, amplifier connect successively, be characterized in being connected signal-processing board between prime amplifier and amplifier, this signal-processing board is connected and composed by analog to digital converter, digital signal processor, photoisolator, digital to analog converter.

The course of work of signal-processing board is as follows: the signal of exporting from the prime amplifier of mass spectrograph is the actual mass signal x that obtains of former mass spectrograph (t), be converted to a digital signal through sampling and analog to digital converter, by contrary equivalent system it is carried out filtering with realization through digital signal processor processes again, it is output as s (n), and photoisolator is influencing each other for fear of digital signal processor and former mass spectrograph amplifier level, to improve job stability, after digital to analog converter is converted to simulating signal s (t) with digital signal s (n), promptly obtain the idealized mass signal that is similar to.

Ultimate principle is: establishing Utopian mass signal is s (t), and the actual mass signal of obtaining is x (t), and the unit impulse response of equivalent system is h (t), is had by signal processing theory:

x(t)=s(t)*h(t)

By the principle of work of analysis and research quadrupole mass spectrometer, the unit impulse response that the method for application system identification derives equivalent system is the gaussian-shape function, promptly h ( t ) = k 2 π σ e t 2 2 σ 2 Wherein parameter k and σ can directly be measured by experiment.

After drawing the unit impulse response h (t) of equivalent system, and then unit impulse response that can derive its contrary equivalent system is h -1(t), the actual mass signal of obtaining is handled the idealized mass signal that can obtain being similar to by contrary equivalent system, promptly

S (t)=x (t) * h -1(t) thus improved the resolution of mass spectrograph greatly.

The utility model compared with prior art has following advantage:

1, improved the resolution of mass spectrograph greatly;

2, do not change the physical arrangement of existing mass spectrograph, only need to increase a digital signal panel, can improve the performance of existing mass spectrograph greatly with lower cost;

3, provide interface with computing machine, be convenient to and being connected of computing machine, expand its analytic function.

Description of drawings

Fig. 1 is existing quadrupole mass spectrometer structural representation;

Fig. 2 is the utility model high resolving power quadrupole mass spectrometer structural representation;

Fig. 3 is the hardware composition frame chart of the digital signal panel among Fig. 2.

Embodiment

As shown in Figure 2, the utility model is to be connected signal-processing board between prime amplifier and amplifier.As shown in Figure 3, signal-processing board is connected and composed by analog to digital converter, digital signal processor, photoisolator, digital to analog converter, is connected time clock between analog to digital converter and digital signal processor.Analog to digital converter adopts the ADC0809 chip, and digital signal processor adopts the TMS320C52 chip, and digital to analog converter adopts the DAC0832 chip.

Sampling frequency f oDetermine: according to the sampling law, in conjunction with T sweep time of each mass number of quadrupole mass spectrometer s, get sampling frequency f 0=200/T s.

The design of contrary equivalent system: by the unit impulse response h of the contrary equivalent system of deriving above -1(t), by postponing τ=100 T o, T o=1/f o, intercepting g (t)=h -1(t-τ), t=[0,201 T o]. to it with f oFor sampling frequency after taking a sample g (n), therefore can be approximately contrary equivalent system the wave filter of a finite impulse response, can programme to digital signal processor TMS320C52 chip by g (n) and realize the corresponding digital Filtering Processing.Promptly realize s (n)=x (n) * g (n).

Claims (1)

1, a kind of high resolving power quadrupole mass spectrometer, comprise that sampling system, ion gun (ionization chamber), quadrupole mass filter, faraday cell, prime amplifier, amplifier connect successively, it is characterized in that being connected signal-processing board between prime amplifier and amplifier, described signal-processing board is connected and composed by analog to digital converter, digital signal processor, photoisolator, digital to analog converter.
CN 02250723 2002-12-27 2002-12-27 High-resolution quadrupole mass spectrometer CN2589978Y (en)

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Application Number Priority Date Filing Date Title
CN 02250723 CN2589978Y (en) 2002-12-27 2002-12-27 High-resolution quadrupole mass spectrometer

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CN 02250723 CN2589978Y (en) 2002-12-27 2002-12-27 High-resolution quadrupole mass spectrometer

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100454020C (en) * 2005-10-19 2009-01-21 广州禾信自动化系统有限公司 Gas-phase molecular ion reactor based on radio-frequency quard-polar rod, its realization and use
CN101470101B (en) * 2007-12-28 2011-12-21 中国航天科技集团公司第五研究院第五一〇研究所 Relative sensitivity calibration system for quadrupole mass spectrometer
CN102621948A (en) * 2012-03-08 2012-08-01 中国科学院地质与地球物理研究所 Remote control mass spectrometer system and control method thereof
CN102171783B (en) * 2008-05-27 2014-04-02 第一探测公司 Driving a mass spectrometer ion trap or mass filter
CN106124608A (en) * 2016-07-05 2016-11-16 东南大学 One utilizes quadrupole mass spectrometer to trace impurity rapid analysis method in minimum gas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100454020C (en) * 2005-10-19 2009-01-21 广州禾信自动化系统有限公司 Gas-phase molecular ion reactor based on radio-frequency quard-polar rod, its realization and use
CN101470101B (en) * 2007-12-28 2011-12-21 中国航天科技集团公司第五研究院第五一〇研究所 Relative sensitivity calibration system for quadrupole mass spectrometer
CN102171783B (en) * 2008-05-27 2014-04-02 第一探测公司 Driving a mass spectrometer ion trap or mass filter
CN102621948A (en) * 2012-03-08 2012-08-01 中国科学院地质与地球物理研究所 Remote control mass spectrometer system and control method thereof
CN106124608A (en) * 2016-07-05 2016-11-16 东南大学 One utilizes quadrupole mass spectrometer to trace impurity rapid analysis method in minimum gas

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