CN105424618A - Optical detection apparatus with characteristic of sensitivity improving, and optical detection method with characteristic of sensitivity improving - Google Patents
Optical detection apparatus with characteristic of sensitivity improving, and optical detection method with characteristic of sensitivity improving Download PDFInfo
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- CN105424618A CN105424618A CN201410455095.6A CN201410455095A CN105424618A CN 105424618 A CN105424618 A CN 105424618A CN 201410455095 A CN201410455095 A CN 201410455095A CN 105424618 A CN105424618 A CN 105424618A
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Abstract
The present invention discloses an optical detection apparatus with the characteristic of sensitivity improving, and an optical detection method with the characteristic of sensitivity improving. The optical detection apparatus comprises: a light source for emitting a detection light beam; a plurality of sample cells arranged in the optical path of the detection light beam; and a detector for receiving and detecting the detection light beam passing through the plurality of the sample cells in a transmission manner.
Description
Technical field
The application relates to a kind of optical detection apparatus and method, particularly relates to the Atomic Absorption Spectrometer and detection method thereof that have and improve sensitivity.
Background technology
Optical detection is a kind of important detection means.Optical detection apparatus and method are widely used in the every field of scientific research, production, life, comprise environmental monitoring, composition measurement, commercial production etc.
Atomic Absorption Spectrometer (AAS) is a kind of important optical detection apparatus, utilizes the characteristic spectral line of element to carry out element determination.The accuracy of measurement result depends on the sensitivity of Atomic Absorption Spectrometer.When microdetermination, especially true.But the detection sensitivity of existing Atomic Absorption Spectrometer is on the low side, usually can only measure the higher sample of concentration, and not high for the usual precision of detection of low concentration sample, cause the result that records unreliable.
Summary of the invention
In order to overcome above problem of the prior art, the application provides a kind of optical detection apparatus, comprising: light source, for launching detection light beam; Multiple sample cell, is arranged in the light path of detection light beam; Detecting device, for receiving and detecting the detection light beam being transmitted through multiple sample cell.
In this optical detection apparatus, multiple sample cell can be adopted to be arranged in various manners and detect in light path.Such as, multiple sample cell can straight line, be arranged in series in detect light beam linear light path on or folded optical path straight segments on.Again such as, multiple sample cell can be distributed on the folded optical path of detection light beam, wherein at least two segmentations of folded optical path, is distributed with at least one sample cell separately.When adopting folded optical path, optical detection apparatus can also comprise at least one reverberator, detects light beam to form the folded optical path with multiple segmentation for reflecting.Reverberator can comprise catoptron, prism or other reflection device any.
In certain embodiments, one or more in multiple sample cell can open and/or closed, and/or can be configured to not add sample in testing process.These sample cells can have the identical effective length along detecting light path, or have different effective lengths.In certain embodiments, this optical detection apparatus can also comprise controller, for controlling one or more opening/closing in multiple sample cell and/or whether to the one or more interpolation samples in multiple sample cell.
In certain embodiments, this optical detection apparatus can also comprise beam selector, and the light for being launched by light source is divided into reference beam and detects light beam, and wherein reference beam is directed into detecting device, and detecting device receives and detects reference beam with generating reference signal.
In certain embodiments, light source can comprise one in hollow cathode lamp, laser diode, deuterium lamp, ultrahigh pressure mercury lamp or their combination, sample cell can comprise at least one in flame atomizer, graphite furnace atomizer or tungsten filament atomizer, and detecting device can comprise monochromator or spectrometer.
In certain embodiments, this optical detection apparatus can be Atomic Absorption Spectrometer.
On the other hand, the application also provides a kind of optical detecting method, comprising: launch from light source and detect light beam; Guide and detect light beam by multiple sample cell; Received by detecting device and detect the detection light beam being transmitted through multiple sample cell.
In this optical detecting method, can adopt to guide in various manners and detect light beam by multiple sample cell.Such as, the multiple sample cells detecting light beam straight-line pass arranged in series can be guided, wherein multiple sample cell can straight line, be arranged in series in detect light beam linear light path on or folded optical path straight segments on.Again such as, detection light beam is guided to comprise: reflection detects light beam to form folded optical path at least one times, and guiding detects light beam respectively by least one in multiple sample cell at least two segmentations of folded optical path.
In certain embodiments, it is one or more that this optical detecting method can also comprise in the multiple sample cell of open and/or closed, and/or not to the one or more interpolation samples in multiple sample cell.
In certain embodiments, this optical detecting method can also comprise and the light that light source is launched is divided into reference beam and detection light beam; Reference beam is guided to arrive detecting device; Received by detecting device and detect reference beam with generating reference signal.
In certain embodiments, light source can comprise one in hollow cathode lamp, laser diode, deuterium lamp, ultrahigh pressure mercury lamp or their combination, sample cell can comprise at least one in flame atomizer, graphite furnace atomizer or tungsten filament atomizer, and detecting device can comprise monochromator or spectrometer.
In certain embodiments, this optical detecting method may be used for atomic absorption spectrum detection.
Summary of the invention part only provides the general introduction to teachings herein, is hereinafter described in detail specific embodiment with reference to accompanying drawing.
Accompanying drawing explanation
Accompanying drawing shows the exemplary embodiment of the application schematically.By referring to accompanying drawing, the thorough understanding of the specific embodiment to the application can be obtained.In the accompanying drawings,
Fig. 1 illustrates the schematic diagram of Atomic Absorption Spectrometer of the prior art;
Fig. 2 illustrates the schematic diagram of the folded form optical detection apparatus according to the embodiment of the present application;
Fig. 3 illustrates the schematic diagram of the linear pattern optical detection apparatus according to the embodiment of the present application;
Fig. 4 illustrates the schematic diagram of another folded form optical detection apparatus according to the embodiment of the present application.
Embodiment
Hereinafter, with reference to accompanying drawing, the specific embodiment of the application is described in detail.
Fig. 1 illustrates the schematic diagram of Atomic Absorption Spectrometer 100 of the prior art.As shown in the figure, Atomic Absorption Spectrometer 100 comprises light source 101, flame sample cell 102 and monochromator 106.Detection light beam from light source is transmitted through flame sample cell 102, causes the absorption of sample in sample cell 102.Transmitted light beam arrives monochromator 106 via the reflection of catoptron.Monochromator 106 carries out light splitting and detection, to determine absorption spectrum to detection light beam.By the analysis to absorption spectrum, can measure sample.
Except sample channel 110, Atomic Absorption Spectrometer 100 can also comprise reference channel 120.Light beam from light source is divided into two-way by front beam selector 104, namely detects light beam and reference beam.Reference beam, via the reflection of catoptron, walks around flame sample cell 102, beam selector 105 after arriving, and is directed to monochromator 106 by rear beam selector.Beam selector can comprise semi-transparent semi-reflecting lens, beam splitter or mechanical chopper.Monochromator receives and detects reference beam, provides reference signal for detecting.Can carry out synchro measure to detection light beam and reference beam, its Measuring Time difference depends on " sampling " frequency of electric signal.
In certain embodiments, smelting furnace 103 can be provided with in reference channel 120.In this case, flame sample cell 102 and smelting furnace 103 can provide two kinds of selectable sample preparation modes, and can exchange between sample channel 110 and reference channel 120, namely when adopting flame sample cell 102 to prepare sample, reference channel 120 is for transmitting reference beam and providing reference signal, when adopting smelting furnace 103 to prepare sample, reference channel 120 detects light beam and sampling signal for transmitting, and sample channel 110 is for transmitting reference beam and providing reference signal.
In addition, Atomic Absorption Spectrometer 100 can also comprise deuterium (D2) source, eliminates background for Atomic absorption.
Generally speaking, follow Lambert-Beer law based on the optical detection absorbed, namely absorption intensity is directly proportional to concentration of component, mathematically can be expressed as follows:
Wherein A is called as absorbance, I
0represent incident intensity and transmitted light intensity respectively with I, l represents the distance (that is, path length) that light is propagated in the material, and ε represents absorptivity, and c represents the concentration of extinction material in material.
Can find from above expression formula, concentration c and the path l of absorbance A and extinction material are directly proportional.Such as, but be usually subject to the restriction of instrument size and manufacturing process, cost, the effective length (corresponding to path l) in single sample pond, the effective length of flame sample cell 102, is difficult to increase considerably.Therefore, for the testing sample of concentration lower (in some cases, close to zero), very little owing to absorbing, transmitted light intensity I is no better than incident intensity I
0, cause the absorption being difficult to detect sample.This also causes the sensitivity of existing Atomic Absorption Spectrometer very low.
In order to improve the sensitivity based on the optical detective technology absorbed, need the difference (I increasing transmitted light intensity and incident intensity
0-I), namely increase sample to the absorption of light, mathematically can be expressed as follows:
Because the size in single sample pond is restricted, the application adopts the design of multiple sample cell, improves the sensitivity of optical detection by increasing total effective length l.
Fig. 2 illustrates the schematic diagram of the folded form optical detection apparatus 200 according to the embodiment of the present invention, and wherein optical detection apparatus 200 adopts the sample channel 210 of folded form.
As shown in the figure, optical detection apparatus 200 can comprise light source 201, multiple sample cell 202-1 ... 202-N and detecting device 206.Although Fig. 2 illustrates the scheme of 4 sample cells, it will be understood by those skilled in the art that the sample cell that can adopt any amount N, wherein N >=2.
Light source 201 can be any suitable light source, includes but not limited to hollow cathode lamp (HCL), laser diode, deuterium lamp, ultrahigh pressure mercury lamp or their combination, etc.The detection light beam that light source 201 is launched is conducted through multiple sample cell 202-1 ... 202-N.
As shown in the figure, sample channel 210 adopts folded form light path, wherein reflects detection light beam via reverberator, and is distributed in by sample cell in the segmentation of folded form light path.Fig. 2 illustrates a kind of concrete distribution mode, and wherein folded form light path has four segmentations, arranges a sample cell in each path segments.But, it will be understood by those skilled in the art that the segmentation that can adopt any amount, and any one or more sample cell that can distribute at least two segmentations.The application should not be restricted on the one hand at this.
Sample cell, for holding testing sample, can adopt various shape and configuration.Such as, sample cell can comprise atomizer, such as flame atomizer, graphite furnace atomizer or tungsten filament atomizer etc.Each sample cell can have the effective length be same to each other or different to each other, and such as, sample cell 202-1 can have effective length l
1, sample cell 202-2 can have effective length l
2, by that analogy.The effective length l that the cumulative formation of these effective lengths is total.In the embodiment shown in Figure 2, total effective length l=l
1+ l
2+ l
3+ l
4.When sample cell has mutually the same effective length, total effective length l can be expressed as 4l simply
1.Such as, when sample cell has 50mm effective length separately, total effective length is 200mm.When adopting flame atomizer, the height of light path above the flame of each sample cell is identical, equal to ensure the effective length of each sample cell.
In certain embodiments, total effective length can regulate.
A kind of regulative mode carries out open and/or closed to one or more in multiple sample cell.In certain embodiments, one or more in multiple sample cell can open and/or closed.Do not have sample in the sample cell of closing, effective length reduces to zero.Comprise in the embodiment of atomizer at sample cell, close atomizer, then can not produce sample in sample cell, effective length is zero.Such as, by only opening in 4 sample cells 2 or 2 of closing in 4 sample cells, total effective length can be shortened.When sample cell has 50mm effective length separately, effective length can shorten to 100mm from 200mm.The open and/or closed of sample cell can be realized by installation switching device in optical detection apparatus 200.In one embodiment, optical detection apparatus 200 can comprise one or more valve, for carrying out open and/or closed to one or more in multiple sample cell.
Another kind of regulative mode is not to the one or more interpolation samples in sample cell, or in other words, only to the one or more interpolation samples in sample cell.Such as, by only adding sample to 1 in 4 sample cells, and not adding sample to other 3 sample cells, total effective length can be shortened.When sample cell has 50mm effective length separately, effective length can shorten to 50mm from 200mm.This regulative mode can not need to add extra device, thus avoids sample cell insertion switch device and increase cost, and avoids carrying out switching manipulation to sample cell.This can reduce costs, simplify the operation.Such as, when sample cell comprises flame atomizer, compared to adding multiple threshold switch to flame atomizer and opening or closing acetylene torch, stop spraying sample to one or more sample cell not only simple to operate, and with low cost.
Certainly, two kinds of regulative modes can combinationally use, and regulate can detect before, detect after carry out, or dynamically to carry out in testing process.Total effective length can regulate in the scope of minimum single effective length and cumulative effective length.When sample concentration is higher, total effective length can be reduced; And when sample concentration is lower, total effective length can be increased to increase the sensitivity of optical detection.This adjustment can require to carry out based on to the difference of sensitivity, brings very large dirigibility for detecting.In certain embodiments, optical detection apparatus 200 can comprise controller (not shown), for controlling the opening/closing of the one or more sample cells in multiple sample cell and/or whether adding sample.Such as, controller can control switchgear (such as valve) or the sample adding set of one or more sample cell.Controller can concentration, sensitivity requirement or user be arranged per sample, regulates total effective length.
In addition, by closeall sample cell or by not adding sample in all sample cells, " the blank detection " of n.s. can be carried out to sample path.The result of skip test may be used for calibrating optical detection apparatus 200, to improve the precision of measurement.
Folded form light path can be formed by reverberator.Reverberator can comprise various catoptron, such as spherical reflector, plane mirror etc.; Various prism, such as prism etc.; Or other is capable of reflecting light the device of bundle.By adjusting the orientation of reverberator, various forms of folded form light path can be formed, and required light beam incidence, reflection and exit direction can be formed.And, by adjusting angle and the height of sample cell, suitably sample cell can be arranged in each segmentation of folded form light path, thus make detection light beam correctly by each sample cell.
The detection light beam being transmitted through sample cell is directed into detecting device 206.Detecting device 206 receives and detects the detection light beam of transmission.Detecting device 206 can comprise monochromator, spectrometer or other detector.
In addition, optical detection apparatus 200 can also comprise reference channel 220.Specifically, as shown in Figure 2, the light beam that light source 201 is launched is divided into detection light beam and reference beam by front beam selector 204.Reference beam can walk around sample cell 202, is directed to detecting device 206 by rear beam selector 205.Detecting device 206 pairs of reference beams receive and detect, and generating reference signal is as the reference data of optical detection.Detecting device 206 can carry out synchro measure to detection light beam and reference beam, and its Measuring Time difference depends on " sampling " frequency of electric signal.Front/rear beam selector can comprise semi-transparent semi-reflecting lens, beam splitter, mechanical chopper or other suitable device.
There is the optical detection apparatus of reference path compared with single-beam optical pick-up unit, can have and better launch signal to noise ratio (S/N ratio), the intensity of light source can be overcome to drift about in time the slow change of the measured signal brought, thus obtain sensitiveer, reliable testing result.
In certain embodiments, reference channel sample cell 203 can also be provided with in reference channel 120.Reference channel sample cell 203 can comprise smelting furnace etc.Reference beam can be transmitted through reference channel sample cell 203, is then directed to detecting device 206 via rear beam selector.In this case, sample cell 202 and reference channel sample cell 203 can provide two kinds of selectable sample preparations or accommodation mode, and can exchange between sample channel 210 and reference channel 220, namely adopt sample cell 202 prepare/hold sample time, reference channel 220 is for transmitting reference beam and providing reference signal, adopt reference channel sample cell 203 prepare/hold sample time, reference channel 220 detects light beam and sampling signal for transmitting, and sample channel 210 is for transmitting reference beam and providing reference signal.
In addition, optical detection apparatus 200 can also comprise deuterium (D2) source 207, eliminates background for Atomic absorption.
In certain embodiments, optical detection apparatus 200 can be Atomic Absorption Spectrometer.In other embodiments, optical detection apparatus 200 can be the pick-up unit of other type.
In certain embodiments, sample channel 210 can adopt other form.
Exemplarily, Fig. 3 illustrates the schematic diagram of linear pattern optical detection apparatus 300.As shown in the figure, in sample channel 310, the detection light beam from light source 301 is linearly propagated, and multiple sample cell 302-1 ... 302-N is arranged in series in the linear light path detecting light beam.Be transmitted through multiple sample cell 302-1 ... the detection light beam of 302-N arrives detecting device 306, and is received by detecting device 306 and detect.
Similarly, by the multiple sample cell 302-1 of open and/or closed ... one or more in 302-N or by not to multiple sample cell 302-1 ... one or more interpolation samples in 302-N, can regulate total effective length of sample channel 310.
This linear pattern design is very succinct, is easy to Installation And Calibration.
As another example, Fig. 4 illustrates the schematic diagram of another folded form optical detection apparatus 400.Optical detection apparatus 400 comprises the sample channel 410 adopting folded form light path.As shown in the figure, in each segmentation of folded form light path, distributed multiple sample cell, in such as the first segmentation, be distributed with sample cell 402-1-1 ... sample cell 402-2-1 is distributed with in 402-1-3, the second segmentation ... sample cell 402-3-1 is distributed with in 402-2-3 and the 3rd segmentation ... 402-3-3.Although Fig. 4 only illustrates 3 sample cells in 3 segmentations and each segmentation, it will be understood by those skilled in the art that sample channel 410 can have any number of segmentation, and the sample cell of any equal number or varying number can be had in each segmentation.In one embodiment, multiple sample cell can be arranged in series in a segmentation of folded form light path, is similar to the embodiment shown in Fig. 3.
Detection light beam from light source 401 can pass through each sample cell, and arrives detecting device 406.Calibration sample passage 410 can be carried out by the angle of the orientation and each sample cell that regulate each reverberator.Similar with above embodiment, by one or more in the multiple sample cell of open and/or closed or by not to the one or more interpolation samples in multiple sample cell, total effective length of sample channel 410 can be regulated.
Folded form design can provide more dirigibility for the layout of optical detection apparatus.And this design can compress the floor area of light path, thus reduce the size of optical detection apparatus, be conducive to its miniaturization and portability.
In certain embodiments, the application is also provided for the method for carrying out optical detection.The method comprises: launched by light source and detect light beam, detection light beam is guided through multiple sample cell, and is received by detecting device and detect the detection light beam being transmitted through multiple sample cell.
In linear light path design, the multiple sample cells detecting light beam straight-line pass arranged in series can be guided.Such as, the multiple sample cell 302-1 of detection light beam straight-line pass from light source 301 can be guided ... 302-N, as shown in Figure 3.
In the light path design of folded form, folded optical path can be formed by reflecting detection light beam at least one times, and at least two segmentations of folded optical path, guide detection light beam respectively by least one sample cell.As shown in Figure 2, by detecting beam reflection three times, four path segments can be formed, and in each segmentation, guide and detect light beam respectively by a sample cell.Or, as shown in Figure 4, by detection beam reflection twice, three path segments can be formed, and in each segmentation, guide and detect light beam respectively by three sample cells.In other embodiments, can by secondary arbitrarily for detection beam reflection, and in any two or more segmentation of folded optical path, guide detection light beam respectively by one or more sample cell.Or, by detection beam reflection repeatedly, folded optical path can be formed, but in a segmentation, only guide detection light beam by multiple sample cell, be similar to the design of linear pattern light path.Those skilled in the art under the instruction of the application, can arrange as required flexibly.The application should not be restricted on the one hand at this.
The method can also comprise: one or more in the multiple sample cell of open and/or closed, and/or not to the one or more interpolation samples in multiple sample cell.Like this, can regulate total effective length of sample channel, to provide required sensitivity and dirigibility.
The method can also comprise: the light that light source is launched be divided into reference beam and detect light beam; Received by detecting device and detect reference beam with generating reference signal.
The method can also comprise closes all samples pond or in all samples pond, does not add sample, to carry out skip test.
Compared to existing detection technique, the optical detection schemes that the application provides can significantly improve the sensitivity of optical detection.And the optical detection sensitivity of the application can regulate as required, various different application scenario therefore can be adapted to.Such as, if the concentration of testing sample is higher, desensitization can be carried out by the total effective length reducing sample channel; If the concentration of testing sample is lower, sensitivity can be improved, to provide testing result more accurately by the total effective length increasing sample channel.
In addition, the optical detection schemes of the application is also for light path design provides great dirigibility.Along with the becoming more diverse of optical detection apparatus, miniaturization or portability, this dirigibility seems particularly important.
Above advantage and other advantage make can be applied to various occasion according to the optical detection schemes of the application, adapt to different demands.
Above with reference to accompanying drawing, describe multiple specific embodiment, but be illustrative to the description of specific embodiment, the restriction not to the application.In the above description, " aspect ", " embodiment ", " embodiment ", " some embodiments " are only used to convenient explanation, identical aspect or embodiment might not be referred to, but identical or different one or more aspect or embodiment can be referred to.The protection domain of the application is defined by the appended claims, the various combinations made when being intended to be encompassed in the principle and spirit that do not deviate from the application, replacement, amendment and equivalents.
Claims (19)
1. an optical detection apparatus, comprising:
Light source, for launching detection light beam;
Multiple sample cell, described multiple sample cell is arranged in the light path of described detection light beam;
Detecting device, for receiving and detecting the detection light beam being transmitted through described multiple sample cell.
2. optical detection apparatus as claimed in claim 1, it is characterized in that, described multiple sample cell is arranged in series on the linear light path of described detection light beam.
3. optical detection apparatus as claimed in claim 1, it is characterized in that, described multiple sample cell is distributed on the folded optical path of described detection light beam, wherein at least two segmentations of described folded optical path, is distributed with at least one sample cell separately.
4. optical detection apparatus as claimed in claim 3, is characterized in that, also comprise at least one reverberator, for reflecting described detection light beam to form the folded optical path with multiple segmentation.
5. optical detection apparatus as claimed in claim 4, it is characterized in that, described reverberator comprises catoptron or prism.
6. optical detection apparatus as claimed in claim 1, is characterized in that, one or more in described multiple sample cell can open and/or closed.
7. optical detection apparatus as claimed in claim 1, it is characterized in that, one or more can being configured in described multiple sample cell does not add sample in testing process.
8. optical detection apparatus as claimed in claim 1, is characterized in that, also comprise controller, for controlling one or more opening/closing in described multiple sample cell and/or whether to the one or more interpolation samples in described multiple sample cell.
9. optical detection apparatus as claimed in claim 1, is characterized in that, also comprise:
Beam selector, the light for being launched by described light source is divided into reference beam and described detection light beam;
Wherein said reference beam is directed into described detecting device, and described detecting device receives and detects described reference beam with generating reference signal.
10. optical detection apparatus as claimed in claim 1, it is characterized in that, described light source comprises one in hollow cathode lamp, laser diode, deuterium lamp, ultrahigh pressure mercury lamp or their combination, described sample cell comprises at least one in flame atomizer, graphite furnace atomizer or tungsten filament atomizer, and described detecting device comprises monochromator or spectrometer.
11. optical detection apparatuss as claimed in claim 1, it is characterized in that, described optical detection apparatus is Atomic Absorption Spectrometer.
12. 1 kinds of optical detecting methods, comprising:
Launch from light source and detect light beam;
Guide described detection light beam by multiple sample cell;
Received by detecting device and detect the detection light beam being transmitted through described multiple sample cell.
13. optical detecting methods as claimed in claim 12, is characterized in that, guide described detection light beam to comprise the described multiple sample cell guiding described detection light beam straight-line pass arranged in series.
14. optical detecting methods as claimed in claim 12, is characterized in that, guide described detection light beam to comprise:
Reflect described detection light beam at least one times to form folded optical path; And
In at least two segmentations of described folded optical path, guide described detection light beam respectively by least one in described multiple sample cell.
15. optical detecting methods as claimed in claim 12, is characterized in that, what also comprise in multiple sample cell described in open and/or closed is one or more.
16. optical detecting methods as claimed in claim 12, is characterized in that, also comprise not to the one or more interpolation samples in described multiple sample cell.
17. optical detecting methods as claimed in claim 12, is characterized in that, also comprise:
The light that described light source is launched is divided into reference beam and described detection light beam;
Described reference beam is guided to arrive detecting device;
Received by detecting device and detect described reference beam with generating reference signal.
18. optical detecting methods as claimed in claim 12, it is characterized in that, described light source comprises one in hollow cathode lamp, laser diode, deuterium lamp, ultrahigh pressure mercury lamp or their combination, described sample cell comprises at least one in flame atomizer, graphite furnace atomizer or tungsten filament atomizer, and described detecting device comprises monochromator or spectrometer.
19. optical detecting methods as claimed in claim 12, it is characterized in that, described optical detecting method is atomic absorption spectrum detection method.
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| CN107543610A (en) * | 2017-09-04 | 2018-01-05 | 中国电子科技集团公司第四十研究所 | A kind of sensitivity measuring apparatus of visible fiber spectrometer |
| CN107941717A (en) * | 2017-11-20 | 2018-04-20 | 徐海峰 | A kind of static state Multi-example pond spectrophotometer |
| CN111795937A (en) * | 2019-04-08 | 2020-10-20 | 株式会社岛津制作所 | Soil analyzer |
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| CN1916600A (en) * | 2005-08-15 | 2007-02-21 | 南京信息工程大学 | Apparatus for quick measuring content of formaldehyde gas |
| CN102175608A (en) * | 2011-01-05 | 2011-09-07 | 上海德凯仪器有限公司 | Light path absorption pool device for infrared gas analysis |
| CN202837172U (en) * | 2012-08-20 | 2013-03-27 | 北京普析通用仪器有限责任公司 | Atomic absorption spectrophotometer of electric sparks or arc light source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1916600A (en) * | 2005-08-15 | 2007-02-21 | 南京信息工程大学 | Apparatus for quick measuring content of formaldehyde gas |
| CN102175608A (en) * | 2011-01-05 | 2011-09-07 | 上海德凯仪器有限公司 | Light path absorption pool device for infrared gas analysis |
| CN202837172U (en) * | 2012-08-20 | 2013-03-27 | 北京普析通用仪器有限责任公司 | Atomic absorption spectrophotometer of electric sparks or arc light source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107543610A (en) * | 2017-09-04 | 2018-01-05 | 中国电子科技集团公司第四十研究所 | A kind of sensitivity measuring apparatus of visible fiber spectrometer |
| CN107543610B (en) * | 2017-09-04 | 2020-08-07 | 中国电子科技集团公司第四十一研究所 | Sensitivity measuring device of visible optical fiber spectrometer |
| CN107941717A (en) * | 2017-11-20 | 2018-04-20 | 徐海峰 | A kind of static state Multi-example pond spectrophotometer |
| CN111795937A (en) * | 2019-04-08 | 2020-10-20 | 株式会社岛津制作所 | Soil analyzer |
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