CN1270174C - Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect - Google Patents
Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect Download PDFInfo
- Publication number
- CN1270174C CN1270174C CN 200410026878 CN200410026878A CN1270174C CN 1270174 C CN1270174 C CN 1270174C CN 200410026878 CN200410026878 CN 200410026878 CN 200410026878 A CN200410026878 A CN 200410026878A CN 1270174 C CN1270174 C CN 1270174C
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- atomic absorption
- light beam
- stationary magnetic
- zeeman effect
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004458 analytical method Methods 0.000 title claims abstract description 27
- 230000000694 effects Effects 0.000 title claims description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 57
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 238000002835 absorbance Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 229910021654 trace metal Inorganic materials 0.000 description 1
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a method for atomic absorption analysis and a device thereof. A light beam is made to go through an atomizer, a monochromator, and a polarized light separator with an external magnetic field to obtain an analytical light beam and a reference light beam; then the analytical light beam and the reference light beam simultaneously and respectively enter two optical detectors to carry out intensity detection and digital operation to both light beams to obtain absorbance values of atomic absorption. The device is composed of a light source, the atomizer, a stationary magnetic field, the monochromator, the polarized light separator, photoelectric sensors which respectively receives the analytical light beam and the reference light beam, and a logarithmic difference processing device which are orderly arranged according to light beam propagation paths and the paths of the generation, the transmission and the processing of electric signals. The present invention reduces the influence of the intensity fluctuation of the light source on atomic absorption signals in large scales, and rapidly processes the logarithmic difference between a sample light beam and the reference beam in real time to obtain stabler and more exact atomic absorption signals.
Description
Technical field
The present invention is a kind of method and device of atomic absorption analysis, the method and apparatus of the anti-Zeeman effect in especially a kind of stationary magnetic field (Inverse Zeeman Effect) atomic absorption analysis.
Background technology
Stationary magnetic field Zeeman atom absorption method is the method for the analysis trace-metal that is widely used, according to the object difference that the stationary magnetic field applies, can be divided into the positive Zeeman effect in stationary magnetic field and (claim direct Zeeman effect again.Magnetic field puts on radiating light source, produces spectral line of emission division) and the anti-Zeeman effect in stationary magnetic field (magnetic field puts on atomizer, produces the absorption line division).Because what anti-Zeeman effect produced is the absorption line division, no matter be atomic absorption, or background absorption, all carry out in same wavelength location, have more advantage, the realization of device is comparatively convenient again, so be widely adopted.
The process of common anti-Zeeman effect atomic absorption method is: the light that light source sends enters photodetector after passing through atomizer, monochromator, polarizer.The stationary magnetic field is added on the atomizer, and magnetic direction is perpendicular to beam direction.By controlling the mutually perpendicular light beam in polarization direction that polarizer or control polarizer are separated, allow and characterize total π light beam that absorbs (atomic absorption+background absorption) intensity (polarization direction is parallel to magnetic direction, to call sample beam in the following text) and (polarization direction is perpendicular to magnetic direction to characterize the σ light beam of background absorption intensity, to call reference beam in the following text) timesharing enters same photodetector, by intensity detection, the mathematical operation of two light beams, draw the absorbance that characterizes constituent content to be measured (concentration).The characteristics of this method are that the light beam that measurement always absorbs is the light that is sent in the different moment by light source with the light beam of measuring background absorption, and always absorption and background absorption signal can't be measured simultaneously, but priority measurement is in regular turn just finished by twice measurement.Because the hollow cathode lamp that the atomic absorption analysis method generally adopts, its light emissive porwer fluctuation is bigger, different emissive porwers constantly have certain difference, produced a series of problem at interval between this twice measurement: as the drift of light source self, and for example variation has taken place in the background absorption signal between twice measurement.These all are the roots that produces error.
There is a United States Patent (USP) (United States Patent 3,937,577) to narrate a kind of device.What this patent adopted is positive Zeeman effect (magnetic field puts on radiating light source), so be " wavelength preselected (preselected as to wavelength) ", the wavelength of sample beam is different from reference beam.What this patent adopted is anti-Zeeman effect (magnetic field puts on atomizer), and sample beam is identical with the reference beam wavelength.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can better deduct the noise that the light source emission intensity fluctuation causes, accurately obtain lower detection signal, simple in structure, anti-Zeeman effect atom absorption method in the stationary magnetic field that reliability is high and device.
The objective of the invention is to realize by following proposal:
Radiating light source sends the light beam that contains atomic features spectral line to be analyzed, enters atomizer.The stationary magnetic field puts on the atomizer.After light beam passes atomizer, enter monochromator.Monochromator meets the dispersive power requirement of conventional atomic absorption method.The polarization composition that in each characteristic frequency, has comprised two mutually orthogonals by the light beam behind the monochromator.A polarization separator is arranged behind the monochromator, light beam spatially is separated into analysis light beam and reference beam, again the gained light beam is carried out intensity detection, digital operation by photodetector to two kinds of light beams, obtain the atomic absorption absorbance, be characterized in analyzing light beam and reference beam and enter two photodetectors simultaneously respectively.
After analysis light beam and reference beam enter two photodetectors simultaneously respectively, undertaken in real time or high speed (two signals sampling mistimings are less than 10 microseconds) logarithmic difference signal Processing by the logarithmic difference treating apparatus transform the signal that obtains from photodetector, obtain the atomic absorption signal of interference such as correcting background absorption.Electric signal before logarithmic difference is handled can be used as reference signals such as background absorption signal.
Above-mentioned externally-applied magnetic field is the stationary magnetic field, and magnetic direction is perpendicular to the optical axis direction of light beam.
Realize the device of the anti-Zeeman effect atomic absorption analysis in the stationary magnetic field method of the object of the invention, be that the photoelectric sensor of accepting to analyze light beam and reference beam by light source, atomizer, monochromator, polarized light separator, respectively is arranged in order by direction of beam propagation and forms, the both sides up and down of atomizer are equipped with the stationary magnetic field generating means, respectively connect a logarithmic difference treating apparatus behind the photoelectric sensor, by being electrically connected.Above-mentioned light source is a feature sharp line light source, is hollow cathode lamp, electrodeless discharge lamp or laser instrument.When adopting hollow cathode lamp or electrodeless discharge lamp as light source, owing to can deduct intensity of light source fluctuation preferably, the lamp power supply can adopt the dutycycle lower than conventional atom absorption method (＜1: 15).
Because the optical beam ratio that hollow cathode lamp and electrodeless discharge lamp send is dispersed, in order to improve beam quality, make light beam more concentrated, be provided with light beam focussed collimated device or refraction of optical beam catoptron between light source and atomizer, light beam focussed collimated device is a focus lamp, refraction of optical beam catoptron concave mirror.
In order to obtain better electric signal, be connected with electric signal amplification, modulate circuit between photoelectric sensor and the logarithmic difference treating apparatus.
Above-mentioned photoelectric sensor is photomultiplier or solid photoelectric sensor, and when adopting photomultiplier, the negative high voltage of its ride gain can be by the power supply of same road negative high voltage power source, to offset the signal noise that part causes owing to the negative high voltage fluctuation.Under high background absorption situation, can in analytic process, improve the intensity of light source, perhaps improve sensitivity, the electric signal magnification of each road photoelectric sensor in proportion.
The logarithmic difference treating apparatus is the computing machine of logarithmic difference amplifier or external A/D converter, in order to obtain best real-time, the logarithmic difference amplifier of logarithmic difference treating apparatus hardware.When the logarithmic difference treating apparatus is computing machine, need the electric signal that produces is converted to digital signal by A/D converter earlier, carry out logarithmic difference by software again and handle.
Compared with prior art, good effect of the present invention is:
(1) resulting analysis light beam and reference beam are entered two photodetectors simultaneously respectively, make it to carry out in real time, fast the logarithmic difference processing of sample beam and reference beam, obtain more stable and accurate atomic absorption signal;
(2) owing to can reduce the influence of intensity of light source fluctuation significantly to the atomic absorption signal, when adopting hollow cathode lamp or electrodeless discharge lamp as light source, the lamp power supply can adopt the dutycycle lower than conventional atom absorption method (＜1: 15), sending under the condition of same temporal light intensity, reduce average lamp current significantly, prolonged light source life;
(3) simple in structure, the reliability height.
The present invention can be widely used in the ultimate analysis instruments such as the various all types of atomic absorption spectrophotometer (AAS)s that adopted the anti-Zeeman effect atomic absorption method in stationary magnetic field, mercury analyzer.
Description of drawings
Fig. 1 is the structural representation of the device of the anti-Zeeman effect atomic absorption analysis in stationary magnetic field method;
Fig. 2 is the apparatus structure synoptic diagram of embodiment 2;
Fig. 3 is the apparatus structure synoptic diagram of embodiment 3.
Among the figure: power supply 1, light beam 2, focus lamp 3, stationary magnetic field generating means 4, atomizer 5, monochromator 6, separated light beam 7, polarized light separator 8, photoelectric sensor 9, reference beam strength signal 10, sample beam strength signal 11, logarithmic difference treating apparatus 12, atomic absorption signal output 13, reference beam 14, sample beam 15, electric signal amplification, modulate circuit 16, A/D converter 17, computing machine 18, concave mirror 19.
Embodiment
Embodiment 1:
As shown in Figure 1, the device of the anti-Zeeman effect atomic absorption analysis in stationary magnetic field of the present invention method is that the photoelectric sensor 9 of accepting to analyze light beam and reference beam by light source 1, atomizer 5, monochromator 6, polarized light separator 8, respectively is arranged in order by direction of beam propagation and forms, the both sides up and down of atomizer are equipped with the stationary magnetic field generating means, the left and right sides along the light path direction of propagation is placed with focus lamp 3,, photoelectric sensor 9 is electrically connected with logarithmic difference treating apparatus 12.Light source 1 is a hollow cathode lamp, and photoelectric sensor 9 is photomultipliers, and the logarithmic difference treating apparatus is the logarithmic difference amplifier.Light beam 2 by hollow cathode lamp sends enters atomizer 5 by focus lamp 3.The stationary magnetic field puts on the atomizer 5, and its magnetic direction is perpendicular to the optical axis direction of light beam 2.After light beam 2 passes atomizer 5, enter monochromator 6, the feature sharp line is separated from light beam.Enter polarized light separator 8 through the light beam 7 that separates, spatially be separated into the polarization direction and be parallel to magnetic direction respectively and, become sample beam 15 and reference beam 14 respectively perpendicular to two light beams of magnetic direction.Two light beams enter different photoelectric sensor 9 respectively and are converted into reference beam strength signal 10 and sample beam strength signal 11.Electric signal 10,11 obtains the output 13 of atomic absorption signal and is the atomic absorption absorbance through logarithmic difference treating apparatus 12.
Embodiment 2:
As shown in Figure 2, the device of the anti-Zeeman effect atomic absorption analysis in stationary magnetic field of the present invention method is that the photoelectric sensor 9 of accepting to analyze light beam and reference beam by light source 1, concave mirror 19, atomizer 5, monochromator 6, polarized light separator 8, respectively is arranged in order by direction of beam propagation and forms, the both sides up and down of atomizer are equipped with the stationary magnetic field generating means,, photoelectric sensor 9 is electrically connected with logarithmic difference treating apparatus 12.Light source 1 is an electrodeless discharge lamp, and photoelectric sensor 9 is photomultipliers, and logarithmic difference treating apparatus 12 is logarithmic difference amplifiers; Be connected with electric signal amplification, modulate circuit 16 between photoelectric sensor 9 and the logarithmic difference treating apparatus 12.Light beam 2 by electrodeless discharge lamp sends enters atomizer 5 by concave mirror 19.The stationary magnetic field puts on the atomizer 5, and its magnetic direction is perpendicular to the optical axis direction of light beam 2.After light beam 2 passes atomizer 5, enter monochromator 6, the feature sharp line is separated from light beam.Enter polarized light separator 8 through the light beam 7 that separates, spatially be separated into the polarization direction and be parallel to magnetic direction respectively and, become sample beam 15 and reference beam 14 respectively perpendicular to two light beams of magnetic direction.Two light beams enter different photoelectric sensor 9 respectively and are converted into reference beam strength signal 10 and sample beam strength signal 11.Electric signal 10,11 enters logarithmic difference treating apparatus 12 after amplifying, nursing one's health, obtain the output 13 of atomic absorption signal and be the atomic absorption absorbance.
Embodiment 3:
As shown in Figure 3, the device of the anti-Zeeman effect atomic absorption analysis in stationary magnetic field of the present invention method is by light source 1, atomizer 5, monochromator 6, polarized light separator 8, accept to analyze the photoelectric sensor 9 of light beam and reference beam respectively, be arranged in order by direction of beam propagation and form, the both sides up and down of atomizer are equipped with the stationary magnetic field generating means, photoelectric sensor 9 is electrically connected with A/D converter 17, is connected with computing machine 18 behind the A/D converter 17.Wherein light source 1 is a laser instrument, and photoelectric sensor 9 is solid photoelectric sensors.
Laser instrument sends the light beam 2 that contains elemental characteristic sharp line to be analyzed and enters atomizer 5.The stationary magnetic field puts on the atomizer 5, and its magnetic direction is perpendicular to the optical axis direction of light beam 2.After light beam 2 passes atomizer 5, enter monochromator 6, the feature sharp line is separated from light beam.Enter polarized light separator 8 through the light beam 7 that separates, spatially be separated into the polarization direction and be parallel to magnetic direction respectively and, become sample beam 15 and reference beam 14 respectively perpendicular to two light beams of magnetic direction.Two light beams enter different photoelectric sensor 9 respectively and are converted into reference beam strength signal 10 and sample beam strength signal 11.Electric signal 10,11 converts digital signal to through A/D converter 17, carries out logarithmic difference by the software on the computing machine 18 again and handles, and obtains the output 13 of atomic absorption signal and is the atomic absorption absorbance.
Claims (10)
1, the method for the anti-Zeeman effect atomic absorption analysis in a kind of stationary magnetic field, be atomizer, monochromator and the polarized light separator of light beam by externally-applied magnetic field, obtain analyzing light beam and reference beam, by photodetector two kinds of light beams are carried out intensity detection, digital operation again, obtain the atomic absorption absorbance, it is characterized in that described analysis light beam and reference beam enter two photodetectors simultaneously respectively.
2, the method for the anti-Zeeman effect atomic absorption analysis in stationary magnetic field according to claim 1 is characterized in that carrying out the logarithmic difference processing transform the signal that obtains from photodetector.
3, the method for the anti-Zeeman effect atomic absorption analysis in stationary magnetic field according to claim 1 and 2 is characterized in that described externally-applied magnetic field is the stationary magnetic field, and magnetic direction is perpendicular to the optical axis direction of light beam.
4, a kind of device of realizing the anti-Zeeman effect atomic absorption analysis in stationary magnetic field as claimed in claim 1 or 2 method, it is characterized in that it being, accept to analyze the photoelectric sensor of light beam and reference beam respectively by light source, atomizer, monochromator, polarized light separator, be arranged in order by direction of beam propagation and form, the both sides up and down of atomizer are equipped with the stationary magnetic field generating means, connect a logarithmic difference treating apparatus behind the photoelectric sensor, by being electrically connected.
5, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 4 is characterized in that light source is a feature sharp line light source.
6, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 5 is characterized in that feature sharp line light source is hollow cathode lamp, electrodeless discharge lamp or laser instrument.
7, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 4 is characterized in that being provided with between light source and atomizer light beam focussed collimated device or refraction of optical beam catoptron.
8, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 4 is characterized in that being connected with between photoelectric sensor and the logarithmic difference treating apparatus electric signal amplification, modulate circuit.
9, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 4 is characterized in that described photoelectric sensor is photomultiplier or solid photoelectric sensor.
10, the device of the anti-Zeeman effect atomic absorption analysis in realization stationary magnetic field method according to claim 4 is characterized in that described logarithmic difference treating apparatus is the computing machine of logarithmic difference amplifier or external A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410026878 CN1270174C (en) | 2004-04-16 | 2004-04-16 | Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410026878 CN1270174C (en) | 2004-04-16 | 2004-04-16 | Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1563948A CN1563948A (en) | 2005-01-12 |
| CN1270174C true CN1270174C (en) | 2006-08-16 |
Family
ID=34480778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410026878 Expired - Lifetime CN1270174C (en) | 2004-04-16 | 2004-04-16 | Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1270174C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806718B (en) * | 2009-02-13 | 2011-12-14 | 上海光谱仪器有限公司 | AC/DC double-purpose Zeeman effect atomic absorption background correcting system and using method |
| CN101692042B (en) * | 2009-04-02 | 2011-09-28 | 马怡载 | Atomic fluorescence photometer of Zeeman deduction background of constant magnetic field of energy-saving low-price tungsten wire ring furnace |
| RU2497101C1 (en) * | 2012-06-18 | 2013-10-27 | Общество с ограниченной ответственностью "ВИНТЕЛ" | Nuclear-absorption spectrometer, based on zeeman effect |
| CN104390700B (en) * | 2014-10-24 | 2016-11-16 | 上海光谱仪器有限公司 | A kind of time-sharing approach testing circuit of xenon flash lamp Background Correction of Atomic Absorption Spectrometry |
| CN104977283B (en) * | 2015-07-02 | 2018-12-28 | 北京市理化分析测试中心 | Stationary magnetic field is placed in the Zeemen effect Atomic Fluorescence Spectrometer of atomizer |
| CN109060678A (en) * | 2018-08-27 | 2018-12-21 | 北京雪迪龙科技股份有限公司 | A kind of absorbance measuring circuit |
| CN113834797B (en) * | 2021-11-29 | 2022-02-15 | 广东利诚检测技术有限公司 | Method for detecting trace selenium element in cereal food based on light field and magnetic field |
-
2004
- 2004-04-16 CN CN 200410026878 patent/CN1270174C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1563948A (en) | 2005-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0781990B1 (en) | Raman scattered light measuring apparatus | |
| US5870188A (en) | Measuring method and measuring apparatus by light scattering | |
| KR101281105B1 (en) | The method of quantitative analysis for uranium in an aqueous solution | |
| CN1270174C (en) | Method and appts. for atom absorbing analysis of constant magnetic field reverse zeeman effect | |
| CN101408503B (en) | Method for automatically detecting and dynamically substracting stray light of spectrometer and spectrometer | |
| CN108020540B (en) | Laser-induced breakdown spectroscopy detection system | |
| CN1890555A (en) | Device and method of trace gas analysis using cavity ring-down spectroscopy | |
| Anson et al. | Measurement of circular dichroism at millisecond time resolution: A stopped-flow circular dichroism system | |
| CN1249424C (en) | Atomic absorption spectrophotometer | |
| CN100417933C (en) | Multi channel signal gain control system and its control method | |
| CN112326517A (en) | Scanning modulation type laser granularity measuring device | |
| JPS6151569A (en) | Cell identifying device | |
| CN102269705A (en) | Portable quantum dot fluorescent copper ion concentration detection device and detection method by using same | |
| JPH05256782A (en) | Raman spectrometer for analysis of slight amount of constituent | |
| JPS6138447A (en) | Particle analyser | |
| JP3206870B2 (en) | Method and apparatus for measuring nitrogen gas or water vapor in argon gas, method and apparatus for simultaneous measurement of nitrogen gas and water vapor | |
| KR0172623B1 (en) | Method and apparatus for analyzing contaminative element concentrations | |
| CN110530783B (en) | Lateral beam collection method and device for flow cytometer and flow cytometer | |
| CN202512059U (en) | Laser light scattering and Raman spectrum combination device | |
| CN113624745B (en) | Method for improving long-term stability of laser-induced breakdown spectroscopy based on light spots | |
| CN2558989Y (en) | Test device for measuring gas component concentration by spontaneous Raman scattering technique | |
| CN110231313B (en) | Online zero calibration method and device for laser gas analyzer | |
| CN112326617B (en) | Transient toxic invasion detection system and method | |
| CN115096861A (en) | Uranyl ion detection device | |
| JPH0996603A (en) | Flow cytoanalyzer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510070 Building No. 34, compound 100, martyrs Road, Guangzhou, Guangdong Patentee after: GUANGDONG INSTITUTE OF ANALYSIS (CHINA NATIONAL ANALYTICAL CENTER, GUANGZHOU) Address before: 510070 Building No. 34, compound 100, martyrs Road, Guangzhou, Guangdong Patentee before: GUANGDONG INSTITUTE OF ANALYSIS Address after: 510070 Building No. 34, compound 100, martyrs Road, Guangzhou, Guangdong Patentee after: Institute of testing and analysis, Guangdong Academy of Sciences (Guangzhou analysis and testing center, China) Address before: 510070 Building No. 34, compound 100, martyrs Road, Guangzhou, Guangdong Patentee before: GUANGDONG INSTITUTE OF ANALYSIS (CHINA NATIONAL ANALYTICAL CENTER, GUANGZHOU) |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060816 |