CN1873393A - Optical multichannel analysis apparatus - Google Patents
Optical multichannel analysis apparatus Download PDFInfo
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- CN1873393A CN1873393A CN 200510101270 CN200510101270A CN1873393A CN 1873393 A CN1873393 A CN 1873393A CN 200510101270 CN200510101270 CN 200510101270 CN 200510101270 A CN200510101270 A CN 200510101270A CN 1873393 A CN1873393 A CN 1873393A
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Abstract
The invention relates to multi-channel optical analysis device. It belongs to optical analysis measuring device field. It includes spectral measuring apparatus and computational analyzer. The former includes light source, sample holder, grating, and multi-channel optical detector by which the former is connected with the latter. They are set on one line to form the light path. The adopted light path which is different from the existing tech. can avoid backhaul error of the step motor.
Description
Technical field
The present invention relates to optical analysis surveying instrument field, particularly a kind of device for the optical evaluation that is used for multi-channel measurement.
Technical background
The design of the light path system of existing optical analysis surveying instrument is tradition relatively, in order to take the contrast of reference light and sample light, substantially all is to use bifocal path structure.This structure is to adopt accurate stepper motor to rotate beam orifice and catoptron, to reach the purpose of difference witness mark light and sample light light intensity.But because the hysterisis error that stepper motor self exists, so beam orifice and catoptron can't be turned to and the corresponding position of light.A lot of for this reason producers are the precision of the raising step motor of regardless of expense all, and it is poor to reduce backhaul, and this has not only increased the manufacturing cost of instrument greatly, but also can't overcome the existence of this error fully.
Present all optical analysis surveying instruments comprise most advanced surveying instrument, all are single measurement, as day island proper Tianjin high precision spectrophotometer and U.S. EG﹠amp; The equipment such as OMA of GPARC company.Can not repeatedly measure automatically, more can not carry out corresponding error analysis, and for scientific experimentation or monitoring, repeatedly measuring is indispensable link.Since the environmental baseline of test or monitoring can not be absolute idealized, as voltage absolute stability, noiseless or the like, with actual value certain error is arranged so the result who measures is inevitable, even the very big result of deviation appears, so in order to reduce error, existing a lot of sophisticated equipment is very high to the requirement of the manufacturing of machine and use, has caused the raising of cost.It is exactly function singleness that also there is a shortcoming in existing optical analysis surveying instrument, can only finish simple working such as measuring and collect data, can't the data of collecting be further analyzed, the scientific research personnel can only be further analyzed calculating again on the result who measures, just can draw the final objective data.
Summary of the invention
The purpose of this invention is to provide a kind of hyperchannel device for the optical evaluation not enough in the prior art that overcomes, the present invention adopts the light path design that is different from prior art, can avoid the hysterisis error of stepper motor fully.
Further purpose of the present invention provides a kind of hyperchannel device for the optical evaluation that can take multiple measurements with Error Calculation.
A further object of the invention provides a kind of hyperchannel device for the optical evaluation that can measure absolute absorptivity.
The invention provides a kind of hyperchannel device for the optical evaluation, comprise optical spectrum instrumentation and computational analysis instrument, optical spectrum instrumentation comprises light source, testing sample seat, grating and hyperchannel optics detector, and optical spectrum instrumentation is connected with the computational analysis instrument by hyperchannel optics detector; Described light source, testing sample seat and grating are positioned on the same straight line successively, light is diffracted into hyperchannel optics detector by light source and forms light path on grating behind the testing sample seat, the light behind the diffraction is received and converted to digital signal by hyperchannel optics detector and is sent to the computational analysis instrument.The present invention adopts above-mentioned brand-new light path design, as long as select for use and the position of each member are determined, the distance passed through of light and light intensity are exactly an absolute numerical value of determining so, make the error of mechanical motion can not exert an influence to the result who measures, or produce the result that mistake is surveyed.The light source that the present invention adopts is a white light source, the detecting head of hyperchannel optics detector is the ccd sensor that can respond to the hyperchannel light intensity, the computational analysis instrument can be a computing machine or the special computational analysis equipment made from centre data processing capacity, as single-chip microcomputer etc.
Testing sample seat of the present invention can drive in several ways, as Mechanical Driven or Electromagnetic Drive etc.When adopting the Mechanical Driven mode, described testing sample seat comprises power transmitting apparatus and some sample cells, and power transmitting apparatus is used to drive sample cell and alternately is positioned at light path.Sample cell can adopt silica dish or other containers of high precision, is used for the solution of splendid attire testing sample and reference sample, can be high-precision fixed mechanism also, is used for fixing the testing sample of solid.
In order to simplify structure of the present invention, the present invention generally only is provided with two sample cells on the testing sample seat.One is used for splendid attire or fixing testing sample, and one is used for splendid attire or fixed reference sample, and testing sample and reference sample just can alternately be positioned on the light path under the driving of power transmitting apparatus thus.The running of power transmitting apparatus can need not manual intervention by the control of computer or other control instruments fully, institute so that the present invention have more can be handling.
The present invention be directed to the hyperchannel device for the optical evaluation of white light, because the directivity of white light is relatively poor, so in order to make white light have certain directivity, be convenient to measure, the one or more positions of the present invention between light source and testing sample seat, between testing sample seat and the grating or between grating and the hyperchannel optics detector are provided with the lens that are used to adjust the angle of incidence of light degree, generally adopt convex lens.Such as between light source and testing sample seat, being provided with two lens, be convex lens.Regulate the appropriate location of lens, what can make light forms directional light after by first lens, focuses on after by second lens on the axis of moving line of sample cell.The transmission that can comparatively concentrate for the light that makes behind the diffraction can be established lens between grating and hyperchannel optics detector on hyperchannel optics detector for another example.
Described computational analysis instrument mainly comprises: the center processor and the display device that is used to show and export the result that are used for data computation and processing.The light intensity that hyperchannel optics detector can be sensed its detecting head is converted into digital signal, be sent to the computational analysis instrument then and carry out data computation, center processor carries out computing to the digital signal of accepting, and final result is shown by display device.
Because light path of the present invention, the hysterisis error of having avoided motor in the measuring process has improved repeatedly measuring reliability to the influence of measurement result precision, and making to adopt the mean value error to calculate to reduce measuring error becomes possibility.So the present invention can be provided with the measurement controller that is used for the control survey number of times and drives the power transmitting apparatus running, the control end of measuring controller connects with power transmitting apparatus.The measurement controller can be used to control the operation of power transmitting apparatus, thereby realize control to the sample cell motion, the a plurality of sample cells of control that can be artificial alternately and measurement repeatedly, or are controlled certain specific sample cell and are taken multiple measurements on perpendicular to the direction of light path.Hyperchannel optics detector can be sent to the result who repeatedly measures in the computational analysis instrument and carry out Error Calculation by center processor, thereby has improved the precision of measuring.
Because the controllability that sample cell is measured is so the present invention can also be provided with absolute absorptivity counter on the computational analysis instrument.Absolute absorptivity counter can calculate the absolute absorptivity of this material by to the measurement with a kind of variable concentrations solution of material by following principle:
Lambert-Beer law is the philosophy of light absorption, and this law has disclosed: when a branch of light passed transparent medium, the reduction of light intensity was directly proportional with the number of extinction particulate in the thickness of incident light intensity, absorbing medium, the light path.
Be expressed as with mathematic(al) representation:
Perhaps
The I0 here is meant the incident light intensity; I is the transmission light intensity; A is that extinction is inhaled number; B is the distance that light passes through transparent medium; C is meant the concentration of measured matter.
This shows absolute absorptivity:
Because I0, b, c are known coefficient, as long as can calculate a just therefore record the intensity I of transmitted light.
Computational analysis instrument of the present invention also can be the general calculation machine, measures controller and absolute absorptivity counter and be the computing module in the computing machine, also can be the special control device of making, as various single-chip microcomputers etc.
The present invention has following outstanding substantive distinguishing features and obvious improvement with respect to prior art:
1. adopt brand-new light path design, make the error of mechanical motion can not exert an influence, or produce the result that mistake is surveyed the result who measures;
2. be provided with the measurement controller that is used to improve measurement accuracy and stability, made things convenient for the manual control of measuring, reduced the error of measuring, meet the standard of scientific measurement instrument of new generation;
3. be provided with absolute absorptivity counter, further improve the application power of surveying instrument, can directly provide the absolute absorptivity of measured material, simplified the process of scientific measurement, improved the ease for use of product;
4. simple in structure, and under the condition of equal measuring accuracy, require existing all purpose instrument low to the equipment process for machining and manufacturing, so overcome the expensive characteristics of existing commercial apparatus, reduced manufacturing cost, improved the market competitiveness.
Figure of description
Fig. 1 is the light channel structure figure that measuring equipment adopts in the prior art;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is a workflow diagram of the present invention;
Fig. 4 is a relative error distribution plan of measuring transmitance among the embodiment;
The reference sample spectrum picture of taking when Fig. 5 A calibrates for the present invention;
The testing sample spectrum picture of taking when Fig. 5 B calibrates for the present invention;
Fig. 6 is the intensity-location diagram of the standard discrete spectrum picture of Fig. 5;
What Fig. 7 showed is the relation of the wavelength-position after Fig. 6 match;
What Fig. 8 showed is the relation of the wavelength-intensity after Fig. 6 match;
The spectrum picture that Fig. 9 takes when measuring emission spectrum for the embodiment of the invention 1;
Figure 10 is the relation of wavelength-intensity of Fig. 9;
The distribution of variable concentrations liquid transmitance when Figure 11 measures absorption spectra for the embodiment of the invention 2;
Figure 12 is the distribution plan of the absorbance of Figure 11 correspondence;
Figure 13 is the comparison diagram as a result of measurement result of the present invention and existing high precision measuring instrument;
Figure 14 is the figure as a result that the present invention measures absolute absorptivity;
Figure 15 is the mean value of Figure 14 and the result of calculation comparison diagram of existing high precision measuring instrument.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
The design of the light path system of existing optical analysis surveying instrument is tradition relatively partially, in order to take the contrast of reference light and sample light, substantially all be to use bifocal path structure, shown in Fig. 1 prior art index path, relative higher to the requirement of the processing of equipment and manufacturing process like this.And most of instruments, spectrophotometer one series products particularly, if it were not for rotating catoptron A1 and grating A2, be exactly that the rotation detection head is realized scanning to spectrum, be difficult to like this avoid the backhaul of step motor poor fully, thereby influenced the reflection of catoptron A1 or grating A2 or the light intensity of transmission, the error that causes has thus influenced the result to a great extent, a lot of for this reason producers are the precision of the raising step motor of regardless of expense all, and it is poor to reduce backhaul.
The hyperchannel device for the optical evaluation that the object of the present invention is to provide a kind of hysterisis error that can avoid motor that measurement result is exerted an influence, and possess the function that mean value error calculates and absolute absorptivity is calculated simultaneously.Structure of the present invention as shown in Figure 2, comprise optical spectrum instrumentation 1 and computational analysis instrument 2, it is characterized in that optical spectrum instrumentation 1 comprises light source 11, testing sample seat 12, grating 13 and hyperchannel optics detector 14, optical spectrum instrumentation 1 is connected with computational analysis instrument 2 by hyperchannel optics detector 14; Described light source 11, testing sample seat 12 and grating 13 are positioned on the same straight line successively, light forms light path by light source 11 through be diffracted into hyperchannel optics detector 14 behind the testing sample seat 12 on grating 13, and the light behind the diffraction is received and converted to digital signal by hyperchannel optics detector 14 and is sent to computational analysis instrument 2.Testing sample seat 12 comprises power transmitting apparatus 121 and two sample cells 122, and power transmitting apparatus 121 is used to drive sample cell 122 and alternately is positioned at light path.Be provided with two lens 15 between light source 11 and the testing sample seat 12, be provided with lens 15 between grating 13 and the hyperchannel optics detector 14.Computational analysis instrument 2 comprises: the center processor 21 and the display device 22 that is used to show and export the result that are used for data computation and processing.Also comprise the measurement controller 23 and the absolute absorptivity counter 24 that are used for the control survey number of times and drive power transmitting apparatus 121 runnings, the control end of measuring controller 23 connects with power transmitting apparatus 121.The parameters of this equipment is: the photosensitive window size of ccd detector 15 is 1/3 ', and induction resolution is the 510*492 pixel; The parameter of grating 14: indentation density 600 lines per millimeters, radius-of-curvature 1200mm; Spectral measurement ranges: 380nm～670nm; Resolution is that mercury line 576nm and 578nm are clear and legible; Minimum distinguishable wavelength interval is 0.67nm; Measuring error: intensity relative error＜0.02%, transmitance, absorptivity relative error＜0.04%, absorbance relative error＜4%.
Because the present invention can constitute influence to the result who measures in the hysterisis error of measuring process medium power drive apparatus 121, can guarantee in same running environment, to carry out the repeatedly measurement of repetition, so this equipment biggest advantage is to have overcome existing commercial spectrometers to rise not have repeatedly and measure the deficiency of asking average and error analysis.Fig. 4 is the surface chart of our error analysis module.From on can see, in the measurement, to each image taking five times, the maximum relative error of the intensity of obtaining is 0.01%, the maximum relative error of transmitance and absorptivity is 0.02%, and the curve that shows is the relative error distribution situation of the transmitance chosen.
Workflow of the present invention is at first carried out the initialization of equipment as shown in Figure 3, as resetting of power transmitting apparatus 121, and the location of sample cell 122, zero clearing of counter or the like.Select to adopt artificial single step to measure or the measurement of employing multiple error then,, measure hits at this and be set at 5 times if adopt multiple error to measure the then number of times of setting measurement.Further judge whether to calibrate the direct access process of measurement that need not to calibrate.Selection is calibrated and is then taken the standard discrete spectrum picture, shown in Fig. 5 A and Fig. 5 B, and demonstrates intensity distributions, as shown in Figure 6, but the just intensity that this moment, we obtained is about spatial distributions, and we will obtain the distribution of intensity about wavelength, just can continue more accurate measurement.Further calibrate and match, Fig. 7 shows is wavelength-position relation after the match, and shows the error of fitting size, such as here be that maximum error is 0.21nm, and variance and be about 0.1088nm
2, what Fig. 8 showed is the relation of wavelength-intensity, has had Fig. 8 just can further take other images and has analyzed.Call witness mark object image module respectively and measure the determinand image module and the sample cell 122 of splendid attire testing sample and reference sample is carried out 5 times measure, testing sample and reference sample move reciprocatingly perpendicular to light path under the drive of power transmitting apparatus 121 and measure, and carry out the error computing, draw institute's altimetric image wavelength-strength relationship figure at last.
Below the example of taking emission spectrum and absorption spectra with this equipment respectively describes.
Taking the light source that emission spectrum adopted is blue-ray LED, and as shown in Figure 9, can draw light source and be is spectrum in the scope at center with 468.4nm, and its halfwidth is 59.4nm.
The liquor potassic permanganate of taking several variable concentrations of employing in the absorption spectra is as medium, and concentration is respectively 6.33 * 10
-4Mol/L, 5.38 * 10
-4Mol/L, 4.75 * 10
-4Mol/L, 4.43 * 10
-4Mol/L, 3.80 * 10
-4Mol/L and 3.16 * 10
-4Mol/L.Figure 11 is the comparison of their transmitance, and Figure 12 is the comparison of corresponding absorbance, and they meet Beer law as can be seen from last.Figure 13 selects wherein 4.43 * 10
-4The solution of mol/L, the result that the present invention measures and with the comparison of the spectrophotometric measurement result of day island proper Tianjin UV-3101PC high precision, from can see that this equipment accuracy is goodish.These several charts all are the results who carries out Error Calculation after measuring for 5 times, and this also is the function that the measuring equipment of prior art does not have.And Figure 14 reflection is the peculiar function of another native system: directly the absolute extinction of measurement of species is inhaled number, from the figure as can be seen, except wherein a curve there is a deviation at the peak value place, other all be consistent in the extreme.And 15 figure are Figure 14 mean value curve and the spectrophotometric result in Tianjin, island, and Tianjin, the island spectrophotometer not absolute extinction of energy measurement is inhaled number, are the comparison of the result after handling here.
Claims (9)
1. hyperchannel device for the optical evaluation, comprise optical spectrum instrumentation (1) and computational analysis instrument (2), it is characterized in that optical spectrum instrumentation (1) comprises light source (11), testing sample seat (12), grating (13) and hyperchannel optics detector (14), optical spectrum instrumentation (1) is connected with computational analysis instrument (2) by hyperchannel optics detector (14); Described light source (11), testing sample seat (12) and grating (13) are positioned on the same straight line successively, light forms light path by light source (11) through be diffracted into hyperchannel optics detector (14) behind the testing sample seat (12) on grating (13), and the light behind the diffraction receives and converts to digital signal by hyperchannel optics detector (14) and is sent to computational analysis instrument (2).
2. hyperchannel device for the optical evaluation according to claim 1 is characterized in that testing sample seat (12) comprises power transmitting apparatus (121) and some sample cells (122), and power transmitting apparatus (121) is used to drive sample cell (122) and alternately is positioned at light path.
3. hyperchannel device for the optical evaluation according to claim 2 is characterized in that testing sample seat (12) is provided with two sample cells (122).
4. hyperchannel device for the optical evaluation according to claim 1 is characterized in that between light source (11) and testing sample seat (12), between testing sample seat (12) and the grating (13) or the one or more positions between grating (13) and the hyperchannel optics detector (14) are provided with the lens (15) that are used to adjust the angle of incidence of light degree.
5. hyperchannel device for the optical evaluation according to claim 4 is characterized in that being provided with two lens (15) between light source (11) and the testing sample seat (12).
6. hyperchannel device for the optical evaluation according to claim 5 is characterized in that being provided with lens (15) between grating (13) and the hyperchannel optics detector (14).
7. according to claim 1 or 2 or 3 or 4 or 5 or 6 described hyperchannel device for the optical evaluation, it is characterized in that described computational analysis instrument (2) comprising:
The center processor (21) that is used for data computation and processing;
With the display device that is used to show and export the result (22).
8. hyperchannel device for the optical evaluation according to claim 7, it is characterized in that described computational analysis instrument (2) also comprises the measurement controller (23) that is used for the control survey number of times and drives power transmitting apparatus (121) running, the control end of measuring controller (23) connects with power transmitting apparatus (121).
9. hyperchannel device for the optical evaluation according to claim 8 is characterized in that described computational analysis instrument (2) also is provided with absolute absorptivity counter (24).
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| CN 200510101270 CN1873393A (en) | 2005-11-17 | 2005-11-17 | Optical multichannel analysis apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839423A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | For the method for half volatilization and the direct Mass Spectrometer Method of difficult volatile organic compounds in blood |
| CN110832303A (en) * | 2017-07-10 | 2020-02-21 | 株式会社岛津制作所 | Flame atomic absorption spectrophotometer |
| CN113791039A (en) * | 2020-05-25 | 2021-12-14 | 中国石油化工股份有限公司 | Unmanned aerial vehicle-mounted detection method and system for hazardous chemical substance leakage |
-
2005
- 2005-11-17 CN CN 200510101270 patent/CN1873393A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832303A (en) * | 2017-07-10 | 2020-02-21 | 株式会社岛津制作所 | Flame atomic absorption spectrophotometer |
| CN110832303B (en) * | 2017-07-10 | 2022-09-13 | 株式会社岛津制作所 | Flame atomic absorption spectrophotometer |
| CN109839423A (en) * | 2017-11-27 | 2019-06-04 | 中国科学院大连化学物理研究所 | For the method for half volatilization and the direct Mass Spectrometer Method of difficult volatile organic compounds in blood |
| CN113791039A (en) * | 2020-05-25 | 2021-12-14 | 中国石油化工股份有限公司 | Unmanned aerial vehicle-mounted detection method and system for hazardous chemical substance leakage |
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Open date: 20061206 |