CN104390913B - A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source - Google Patents
A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source Download PDFInfo
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- CN104390913B CN104390913B CN201410577363.1A CN201410577363A CN104390913B CN 104390913 B CN104390913 B CN 104390913B CN 201410577363 A CN201410577363 A CN 201410577363A CN 104390913 B CN104390913 B CN 104390913B
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Abstract
Circuit is detected the invention discloses a kind of frequency modulation(PFM) being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source, it includes：Photomultiplier, preamplifier, the first photosignal separation change-over circuit, the second photosignal separation change-over circuit, A/D converters and control circuit, the photomultiplier receive compound light intensity signal, are converted into electric signal；The preamplifier connects photomultiplier, and photo-signal is converted into photoelectric signal；The first photosignal separation change-over circuit separates change-over circuit with the second photosignal and is attempted by between preamplifier and A/D converters, the composite photoelectric signal that preamplifier is exported is separated and changed, and reach A/D converters, the A/D converters are converted into corresponding data signal, and reach control circuit.The program simply easily realizes that it realizes the real-time background correcting system of continuous light source background correction, is prevented effectively from the time interval error for producing background correction.
Description
Technical field
The present invention relates to atomic absorption technique, and in particular to Background Correction of Atomic Absorption Spectrometry technology.
Background technology
Continuous light source background correction is one of atomic absorption spectrography (AAS) background correction main method, is also most classical background
Correction method.It is few than hollow cathode lamp self-absorption method and Zeeman method background correction loss of sensitivity.
The use of deuterium lamp as continuous light source background correction light source is most commonly seen method, usually using time division modulation：I.e.
Hollow cathode lamp and deuterium lamp are all powered using square-wave pulse and separated on lighting time, and deuterium lamp is detected respectively in detection circuit
With the light intensity of hollow cathode lamp and the signal being absorbed by the sample, background correction is carried out.
Second method：Combined type calibration light source is used as using deuterium lamp+tungsten lamp.And tungsten lamp, due to being heat radiation, so not
Can be with usual frequency (for example：The minimum 50Hz needed in Atomic absorption) pulse power supply mode modulates light energy size.Often exist
In this device, deuterium lamp and tungsten lamp all use direct current supply, using light mode is cut, so as to the light and hollow cathode of continuous light source
The light of lamp line source is separated from the time.
Both above mode, the time interval error of background correction can be all produced for vertiginous background：That is, determine
The light of the continuous light source background correction light source of background signal and the light of the hollow cathode lamp source of the total absorption signal of measurement is not same
One time, the background absorption that they are measured to is incomplete same.
Furthermore, in existing technology using deuterium lamp be Background Correction of Atomic Absorption Spectrometry light source, its in use exist with
Lower shortcoming：
1. wave-length coverage is short：Only 190-340nm, during using deuterium lamp as background correction light source, analysis wavelength is more than 340nm
Element background value correction it is very difficult, for example：Cr (analysis of line wavelength is 357.9nm) Ca (analysis of line wavelength is 422.7nm) this
Some common elements of sample, still have serious background absorption, now deuterium lamp can not carry out background correction when sample is complicated.
2. power consumption is big, heating is serious：The deuterium lamp for being generally used for Atomic absorption is 30W.Instrument reaches that the thermally equilibrated time is long.
3. power supply is complicated, usual deuterium lamp needs 3 groups of power supplies:Filament power supply, starting electric source, working power.Its
Opening and closing have strict sequential, and filament supply voltage (electric current) is different with when working in preheating.
4. needing longer preheating time, general deuterium lamp needs preheating just to come into operation for 30 minutes.
5. short life, the common deuterium lamp life-span is 500 hours, the good deuterium lamp life-span is 2000 hours.
6. deuterium lamp method also has a major defect, i.e., its light energy at most only 5 is in general changed by electric current adjustment
Deuterium lamp under interval again, low current can extinguish.Therefore often also need to be balanced by means of optics, that is, need to increase optics
Element and its mechanical structure for adjusting it, and it is aided with corresponding control circuit, with the Atomic absorption of Pa Jin Elmer Co., Ltd of the U.S.
Exemplified by except adjust deuterium lamp electric current, also one five times attenuator.So have 25 times altogether of adjustment interval, and adjusting
The process of whole energy balance is also relative complex.
The content of the invention
For the time of background correction can be produced for vertiginous background in existing continuous light source background correction scheme
The problem of error, realized it is an object of the invention to provide a kind of while measuring the frequency tune of the Background Correction of Atomic Absorption Spectrometry of background
System detection circuit.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source, should
Detection circuit includes：
Photomultiplier, the photomultiplier receives for the xenon flash lamp of background correction and being combined for hollow cathode lamp
Light intensity signal, is converted into electric signal；
Preamplifier, the preamplifier connects photomultiplier, and photo-signal is converted into photoelectric signal；
First photosignal separates change-over circuit, first photosignal separation change-over circuit connection preamplifier and
A/D converters, it isolates the photosignal of the hollow cathode lamp in the composite photoelectric signal of preamplifier output, and changes
Into a DC voltage being directly proportional to hollow cathode lamp light energy signal；
Second photosignal separates change-over circuit, second photosignal separation change-over circuit connection preamplifier and
A/D converters, it isolates the photosignal of the xenon flash lamp in the composite photoelectric signal of preamplifier output, and is converted into
One DC voltage for being directly proportional to xenon flash lamp light energy signal.
A/D converters, the A/D converters connect the first photosignal separation change-over circuit and the separation of the second photosignal
Change-over circuit, corresponding data signal is converted to by the xenon flash lamp of output with the DC voltage of hollow cathode lamp；
Circuit is controlled, the control circuit connects A/D converters.
In the preferred scheme of the detection circuit, the preamplifier includes operational amplifier OP1, resistance R1 and electricity
Hold C1, the resistance R1 and electric capacity C1 are attempted by operational amplifier OP1 two ends, realize that impedance is converted.
Further, first photosignal separation change-over circuit include 50Hz bandpass filters, the first detecting circuit,
Phase-shift circuit, the first low pass filter, the input of the 50Hz bandpass filters are used as the whole input for separating change-over circuit
End, connects preamplifier, and the output end of 50Hz bandpass filters connects the input of the first detecting circuit, the first detecting circuit
Output end connection phase-shift circuit input, the output end of phase-shift circuit connects the input of the first low pass filter, and first is low
The output end of bandpass filter connects A/D converters as the output end of whole separation change-over circuit.
Further, the second photosignal separation change-over circuit includes 1kHz bandpass filters, the second detecting circuit
And second low pass filter, the input of the 1kHz bandpass filters is used as the input of whole separation change-over circuit, even
Preamplifier is connect, its output end connects the input of the second detecting circuit, the output end connection second of the second detecting circuit is low
The input of bandpass filter, the output end of the second low pass filter is used as the output end of whole separation change-over circuit, connection A/D changes
Parallel operation.
The scheme that the present invention is provided simply is easily achieved in structure；Functionally, in a detector photomultiplier
On realize the real-time background correcting system of continuous light source background correction, realize the continuous light in same timing background signal
The light of the light of source background correction light source and the hollow cathode lamp source of the total absorption signal of measurement, effectively solves prior art rapid
The problem of background of change can produce the time interval error of background correction.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is circuit theory diagrams of the invention；
The compares figure for the various signal waveforms that Fig. 2 is related to when carrying out background correction for the present invention.
Embodiment
In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
For, as the Background Correction of Atomic Absorption Spectrometry optical system of Background Correction of Atomic Absorption Spectrometry light source, being using xenon flash lamp
Letter can be absorbed the light of the continuous light source background correction light source pulse xenon lamp of same timing background signal and measurement are total
Number hollow cathode lamp source light, it is ensured that the background absorption that they are measured to is identical, the present invention use frequency as shown in Figure 1
Modulation detection circuit.
As seen from the figure, frequency modulation(PFM) detection circuit mainly includes photomultiplier 1, preamplifier 2, the filter of 1kHz band logicals
Ripple device 3, the second detecting circuit 4, the second low pass filter 5,50Hz bandpass filters 6, the first detecting circuit 7, phase-shift circuit 8,
First low pass filter 9, A/D converters 10 and control circuit (not shown).
Wherein photomultiplier 1 receives the compound light intensity signal of the xenon flash lamp and hollow cathode lamp for background correction,
It is converted into electric signal.
Preamplifier 2 connects photomultiplier 1, and the compound light intensity signal received is converted to by photo-signal
Photoelectric signal, and export.
The preamplifier 2 specifically includes operational amplifier OP1 and resistance R1, electric capacity C1, and resistance R1 and electric capacity C1 simultaneously connect
At operational amplifier OP1 two ends, preamplifier 2 is thus constituted, realizes that impedance is converted, the photo-signal of reception is changed
For photoelectric signal.
Wherein, 50Hz bandpass filters 6, the first detecting circuit 7, phase-shift circuit 8, the first low pass filter 9 are sequentially connected
The first photosignal separation change-over circuit is constituted, first photosignal separation change-over circuit connects preamplifier and A/ respectively
D converters, it isolates the photosignal of the hollow cathode lamp in the composite photoelectric signal of preamplifier output, and is converted into
One DC voltage for being directly proportional to hollow cathode lamp light energy signal.
Specifically, the input of 50Hz bandpass filters 6 is used as whole separation in the first photosignal separation change-over circuit
The input of change-over circuit, connects preamplifier, and the output end of 50Hz bandpass filters 6 connects the defeated of the first detecting circuit 7
Enter end, the output end connection input of phase-shift circuit 8 of the first detecting circuit 7, the output end of phase-shift circuit 8 connects the first low pass filtered
The input of ripple device 9, the output end of the first low pass filter 9 is used as the output end of whole separation change-over circuit, connection A/D conversion
Device 10.
Wherein, 1kHz bandpass filters 3, the second detecting circuit 4, the second low pass filter 5 constitutes the second photosignal point
From change-over circuit, second photosignal separation change-over circuit connection preamplifier and A/D converters, it isolates preceding storing
The photosignal of xenon flash lamp in the composite photoelectric signal of big device output, and it is converted into one and xenon flash lamp light energy signal
The DC voltage being directly proportional.
Specifically, separating the input of 1kHz bandpass filters 3 in change-over circuit as whole point in the second photosignal
From the input of change-over circuit, preamplifier 2 is connected, its output end connects the input of the second detecting circuit 4, the second detection
The output end of circuit 4 connects the input of the second low pass filter 5, and the output end of the second low pass filter 5 is used as whole separation
The output end of change-over circuit, connection A/D converters 10.
Before the first photosignal separation change-over circuit and the second photosignal separation change-over circuit being consequently formed are attempted by
Put between amplifier 2 and A/D converters 10, bandpass filter distinguishes hollow cathode light signal and xenon flash lamp optical signal, warp
Cross after phase shift compensation, it is possible to achieve determine background signal at the same time, overcome the time of traditional continuous light source Method for Background Correction
Interval error.
A/D converters 10, it connects the first photosignal separation change-over circuit and the separation conversion of the second photosignal respectively
Low pass filter in circuit, will represent the d. c. voltage signal of hollow cathode intensity of light respectively and represents xenon flash lamp light intensity
The d. c. voltage signal of degree is converted into corresponding data signal, and reaches control circuit.
Circuit is controlled, it is the center of whole detection circuit, and the processing of completion related data and control detection circuit coordinate
Realize the real-time background correcting system of continuous light source background correction.The control circuit specifically realized by corresponding control chip,
For prior art, it is not repeated here herein, it subtracts each other to realize background correction by logarithm.
The realization of the present invention program is further illustrated below by way of an instantiation (referring to Fig. 2)：
Referring to Fig. 2, its first row show the Atomic absorption as Background Correction of Atomic Absorption Spectrometry light source using xenon flash lamp
The lighting oscillogram of the middle hollow cathode lamp of background correction optical system.
In this example, the hollow cathode lamp lighting cycle is 20ms.Wherein, 10ms is lighted, and 10ms extinguishes.
Referring to Fig. 2, its second row show the Atomic absorption as Background Correction of Atomic Absorption Spectrometry light source using xenon flash lamp
The lighting oscillogram of the middle xenon flash lamp of background correction optical system.
In this example, with 1ms cycle lightings, i.e. frequency 1kHz.Within the 15ms times that hollow cathode lamp extinguishes, with 1ms
It can at most be lighted 15 times in cycle lighting, the space in each hollow cathode lamp lighting cycle.
Meanwhile, the electric light frequency and operating current of hollow cathode lamp and xenon flash lamp are by the control in detection circuit in this example
Circuit control processed.
For above-mentioned light path, photomultiplier 1 connects preamplifier 2, the conversion of its optical signal received in this example
For electric signal, and reach preamplifier 2.
Preamplifier is realized that impedance is converted, photoelectric current is believed by operational amplifier OP1 and resistance R1, electric capacity C1 compositions
Number be converted to voltage signal.
Wherein, the compound light intensity signal that photomultiplier is received passes through preamplifier waveform as shown in Fig. 2 the third lines,
The pulsed xenon for the 1kHz being superimposed which includes the 50Hz of hollow cathode lamp optical signal and on hollow cathode light signal
Lamp point modulating signal.
The composite photoelectric signal that preamplifier 2 is exported is divided into two-way：By 50Hz bandpass filters 6, detecting circuit 7, phase
What shift circuit 8, low pass filter 9 were constituted isolates the photosignal of hollow cathode lamp all the way, and is converted into one and hollow the moon
The DC voltage that pole light energy signal is directly proportional；It is made up of 1kHz bandpass filters 3, detecting circuit 4, low pass filter 5
The photosignal of xenon flash lamp is isolated on second road, and is converted into a direct current being directly proportional to xenon flash lamp light energy signal
Pressure.
Wherein, 50Hz bandpass filters 6, the composite signal as shown in Fig. 2 the third lines is filtered, obtained such as Fig. 2 fourth lines
Sine wave signal, by wave detector 7, that is, carry out rectification, obtain 100 weeks sinuous pulsation signals such as Fig. 2 fifth line.Because
Signal can produce phase shift when passing through bandpass filter 6, therefore the signal of detection is entered into phase-shift circuit 8 in circuit, to mend
Repay the phase shift of bandpass filter.The signal passes through low pass filter 9, becomes direct current, its size and hollow cathode light signal into
Quantitative relationship.
Same principle, such as composite signal of Fig. 2 the third lines pass through 1kHz bandpass filters 3, xenon flash lamp 1kHz photoelectricity
Signal separator comes out, and obtains such as the 1kHz sine wave signals of the rows of Fig. 2 the 6th, because the absolute value of the high phase shift of frequency is small, in addition
50Hz signals have had phase shift compensation, and the signal is directly entered after the rectification of wave detector 4, by low pass filter 5, obtain and pulse
Xenon lamp optical signal is directly into the direct current signal of quantitative relationship.
A/D converters 10 measure the direct current signal for representing hollow cathode lamp luminous intensity and represent xenon flash lamp light intensity respectively
The direct current signal of degree, and corresponding data signal is converted thereof into, and reach control circuit.
Control circuit subtracts each other through logarithm realizes background correction.
Due to distinguishing hollow cathode light signal and xenon flash lamp optical signal using bandpass filter, by phase shift compensation
Afterwards, it is possible to achieve determine background signal at the same time, the time interval error of traditional continuous light source Method for Background Correction is overcome.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (2)
1. a kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source, it is special
Levy and be, the detection circuit includes：
Photomultiplier, the photomultiplier receives the compound light intensity of the xenon flash lamp and hollow cathode lamp for background correction
Signal, is converted into electric signal；
Preamplifier, the preamplifier connects photomultiplier, and photo-signal is converted into photoelectric signal；
First photosignal separates change-over circuit, the first photosignal separation change-over circuit connection preamplifier and A/D
Converter, it isolates the photosignal of the hollow cathode lamp in the composite photoelectric signal of preamplifier output, and by the light
Electric signal is converted into a DC voltage being directly proportional to hollow cathode lamp light energy signal；The first photosignal separation turns
Changing circuit includes 50Hz bandpass filters, the first detecting circuit, phase-shift circuit, the first low pass filter, the 50Hz band logicals filter
The input of ripple device connects preamplifier, the output of 50Hz bandpass filters as the input of whole separation change-over circuit
The input of the first detecting circuit of end connection, the output end connection phase-shift circuit input of the first detecting circuit, phase-shift circuit
Output end connects the input of the first low pass filter, and the output end of the first low pass filter is used as whole separation change-over circuit
Output end, connects A/D converters；
Second photosignal separates change-over circuit, the second photosignal separation change-over circuit connection preamplifier and A/D
Converter, it isolates the photosignal of the xenon flash lamp in the composite photoelectric signal of preamplifier output, and by the photoelectricity
Signal is converted into a DC voltage being directly proportional to xenon flash lamp light energy signal；The second photosignal separation conversion electricity
Road includes 1kHz bandpass filters, the second detecting circuit and the second low pass filter, the input of the 1kHz bandpass filters
The input as whole separation change-over circuit is held, preamplifier is connected, its output end connects the input of the second detecting circuit
End, the output end of the second detecting circuit connects the input of the second low pass filter, the output end conduct of the second low pass filter
The output end of whole separation change-over circuit, connects A/D converters；
A/D converters, the A/D converters connect the first photosignal separation change-over circuit and the separation conversion of the second photosignal
Circuit, corresponding data signal is converted to by the xenon flash lamp of output with the DC voltage of hollow cathode lamp；
Circuit is controlled, the control circuit connects A/D converters, subtracts each other to realize background correction by logarithm.
2. frequency modulation(PFM) according to claim 1 detects circuit, it is characterised in that the preamplifier is put including computing
Big device OP1, resistance R1 and electric capacity C1, the resistance R1 and electric capacity C1 are attempted by operational amplifier OP1 two ends, realize that impedance becomes
Change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577363.1A CN104390913B (en) | 2014-10-24 | 2014-10-24 | A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577363.1A CN104390913B (en) | 2014-10-24 | 2014-10-24 | A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source |
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| Publication Number | Publication Date |
|---|---|
| CN104390913A CN104390913A (en) | 2015-03-04 |
| CN104390913B true CN104390913B (en) | 2017-10-20 |
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| CN201410577363.1A Expired - Fee Related CN104390913B (en) | 2014-10-24 | 2014-10-24 | A kind of frequency modulation(PFM) detection circuit being used for using xenon flash lamp as the Background Correction of Atomic Absorption Spectrometry of calibration light source |
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| DE102013201459B4 (en) * | 2013-01-30 | 2017-01-05 | Siemens Aktiengesellschaft | Method for measuring the concentration of a gas component in a sample gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3825344A (en) * | 1971-09-14 | 1974-07-23 | Commissariat Energie Atomique | Device for analysing a substance by atomic absorption with background correction |
| CN1086601A (en) * | 1992-12-04 | 1994-05-11 | 解放军第二○二医院 | Atomic absorption spectrometry analysis with time resolution backgroud correction |
| CN2588366Y (en) * | 2002-12-30 | 2003-11-26 | 武进田 | Background-taking off tungsten lamp combined modulation test controller for atom absorbing spectral photometer |
-
2014
- 2014-10-24 CN CN201410577363.1A patent/CN104390913B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3825344A (en) * | 1971-09-14 | 1974-07-23 | Commissariat Energie Atomique | Device for analysing a substance by atomic absorption with background correction |
| CN1086601A (en) * | 1992-12-04 | 1994-05-11 | 解放军第二○二医院 | Atomic absorption spectrometry analysis with time resolution backgroud correction |
| CN2588366Y (en) * | 2002-12-30 | 2003-11-26 | 武进田 | Background-taking off tungsten lamp combined modulation test controller for atom absorbing spectral photometer |
Non-Patent Citations (2)
| Title |
|---|
| Theoretical description based on Fourier analysis of wavelength-modulation spectrometry in terms of analytical and background signals;Pawel Kluczynski et al.;《Applied Optics》;19990920;第38卷(第27期);第5803-5815页 * |
| 原子吸收光谱分析背景校正技术的新进展;何嘉耀 等;《分析试验室》;20051231;第24卷(第12期);第76-80页 * |
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