CN104422515A - Optical structure for spectrophotometer - Google Patents
Optical structure for spectrophotometer Download PDFInfo
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- CN104422515A CN104422515A CN201310374196.6A CN201310374196A CN104422515A CN 104422515 A CN104422515 A CN 104422515A CN 201310374196 A CN201310374196 A CN 201310374196A CN 104422515 A CN104422515 A CN 104422515A
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Abstract
The invention discloses an optical structure for a spectrophotometer. The optical structure comprises a light source used for providing light beams, a sample cell used for accommodating a sample to be tested and a light uniformizing device used for performing light uniformizing on the light beams provided by the light source so as to make the uniformized light beams pass through the sample to be tested in the sample cell. The invention also discloses an optical system including the optical structure. With the optical structure of the invention adopted, influence of nonuniformity in space and fluctuation in time of light intensity distribution of the light beams which are irradiated on the sample to be tested, on spectroscopic measurement, can be eliminated, and measuring accuracy of the spectroscopic measurement can be improved.
Description
Technical field
The application's relate generally to field of optical analysis, particularly for spectrophotometric optical texture.
Background technology
Spectrophotometer as the application of optical analysis surveying instrument widely.Spectrophotometric light path part is generally made up of the Lights section, light splitting part, sample test part.Spectrophotometric analysis principle is the analytical approach utilizing material to set up the Selective absorber characteristic of different wavelengths of light, for the qualitative and quantitative analysis of micro substance.Make light beam by testing sample and measure the absorption of this sample to wavelength, finally using detector receiving optical signals.By the analysis to absorption spectrum, the structure of matter and the chemical analysis of the analytic target in testing sample just can be judged.In existing spectrophotometer, the light beam that light source sends directly passes through testing sample after collimation.As everyone knows, in spectrophotometer, the light intensity that light source sends must reach certain stability, so the electric power fluctuation of existing spectrophotometer to light source has requirement, the light-intensity variation that light source sends can obtain reasonable control.
But, although existing spectrophotometer controls preferably to the change of light source power is existing, do not consider the uneven of the light distribution of the light beam that light source sends and change.Present inventor is found by research, the light distribution of the light beam that light source sends spatially exists uneven, and light distribution also has fluctuation in time, the light beam light distribution resulting through sample arrival detector also exists uneven and fluctuates in time, thus can affect the measurement result to sample.
Particularly, on the one hand, with regard to light distribution spatially uneven, usually the light beam incided on testing sample is one, and intermediate light is powerful and the hot spot (shown in Fig. 3 A as will be described in detail below) that surrounding light intensity weakens gradually, or light distribution does not spatially have evident regularity uneven hot spot, be therefore irradiated to the diverse location that the light beam light intensity on sample is distributed on sample and change.On the other hand, with regard to light distribution fluctuation in time, according to the characteristic of light source, on hot spot, the light intensity of any point neither be invariable, have fluctuation in time, the light beam light distribution being therefore irradiated to any point on sample also has strong and weak change in time.
Many times, can not be received by ccd detector completely by the light beam after testing sample, namely ccd detector receive only by testing sample after the part of light beam.When ccd detector receives only a part for light beam, even if very little by the light beam light-intensity variation of testing sample, but its local hot spot light distribution spatially can change, thus the light intensity of the light beam causing ccd detector to receive also changes with position spatially, affects the measuring accuracy of testing sample thus.In addition, the light intensity of the same position in hot spot can change in time, light intensity time causing detector to receive and changing, and also can affect the measuring accuracy of testing sample.
In sum, there is the inaccurate problem of spectroscopic measurements that light distribution uneven and in time the fluctuation spatially due to the light beam of light source causes in existing spectrophotometer.
Summary of the invention
The problem of measurement or measuring accuracy is affected for spatially uneven of the light distribution in existing spectrophotometer and fluctuation in time, the object of the application is at least to provide a kind of for spectrophotometric optical texture, and this optical texture can improve the problems referred to above and improve the measuring accuracy to testing sample.
According to the first aspect of the application, provide a kind of for spectrophotometric optical texture, it is characterized in that, comprising: light source, for providing light beam; Sample cell, for placing testing sample; And light balancing device, described light balancing device is used for carrying out even light to the light beam that light source provides, and makes light beam after even light by the testing sample in sample cell.
According to the second aspect of the application, described light balancing device is positioned at before light beam enters testing sample.
According to the third aspect of the application, described light beam carries out dodging before entering testing sample.
According to the fourth aspect of the application, described light balancing device be integrating rod or other have the device of even light action.
According to the 5th aspect of the application, provide a kind of for spectrophotometric optical system, it is characterized in that, comprising: the optical texture according to the above each side of the application; And light source convergent lens, incident optical, collimation lens, convergent lens, outgoing optical fiber, slit, grating, catoptron, detector.
According to the 6th aspect of the application, in optical system according to the 5th, described light source convergent lens is used for sending described light source and the light beam arriving described light source convergent lens is assembled, and makes the light beam after light source convergent lens is assembled enter incident optical; The incident end face of described incident optical for making light beam incide light balancing device with certain emergence angle after incident optical; Described collimation lens is used for collimating the light beam after the even light of light balancing device, and makes the light beam after collimation lens collimation pass through sample cell with the form of parallel beam; Described convergent lens is used for assembling by the light beam after sample cell, and makes the light beam after convergent lens is assembled arrive the incidence end of outgoing optical fiber; Described outgoing optical fiber is irradiated to slit from the exit end of outgoing optical fiber for making light beam after outgoing optical fiber; Described slit for make light beam pass through after be irradiated to grating; Described grating is used for carrying out light splitting to light beam, and makes the light beam after light splitting arrive on catoptron; Described catoptron is used for carrying out reflection to light beam and assembles, and makes the light beam irradiation after reflection is assembled on detector; And described detector is for receiving the light beam after catoptron reflection is assembled.
At least have according to the optical texture of the application and eliminate the light beam light intensity be irradiated on testing sample and be distributed in spatially uneven and fluctuation in time to the technical advantage of the impact of spectroscopic measurements, the measuring accuracy of raising spectroscopic measurements.
In this article, term " connection " or " coupling " are defined as the connection between two main bodys, but not necessarily directly connect, and also can comprise the indirect annexation realized by other intermediate nodes or equipment.
Term used herein " comprises ", " having ", " comprising " and " containing " be open connection verb.Therefore, a kind of device " comprises ", " having ", " comprising " or " containing " one or more assemblies refer to: this device has those one or more assemblies, but be not that only there are those one or more assemblies, can comprise other one or more assemblies NM herein yet.
Should be appreciated that the generality of more than the application describes and the following detailed description is all exemplary and explanat, and be intended to for the application as claimed in claim provides further explanation.
Accompanying drawing explanation
Comprising accompanying drawing is further understand the application for providing, and they are included and form a application's part, and accompanying drawing shows the embodiment of the application, and plays the effect explaining the application's principle together with this instructions.After the embodiment to specific non-limiting the application by reference to the accompanying drawings and below having read, other features of the application and advantage will become easy to understand.Wherein:
Fig. 1 is the spectrophotometric schematic diagram of the optical texture that the embodiment comprised according to the application is shown;
Fig. 2 is side cross-sectional view according to the light balancing device in the optical texture of the embodiment of the application and cross-sectional view; And
Fig. 3 A and 3B is irradiated to light beam on testing sample when not by light balancing device and the schematic diagram by one dimension light distribution when light balancing device on sample surfaces.
Embodiment
With reference to non-limiting example that is shown in the drawings and that describe in detail in the following description, multiple technical characteristic and the Advantageous details of the application is more completely described.Further, the description that have ignored known original material, treatment technology, assembly and equipment is below described, in order to avoid unnecessarily obscure the technical essential of the application.But it will be understood by those skilled in the art that, when describing the embodiment of the application hereinafter, only as explanation, unrestriced mode provides for description and particular example.
In the case of any possible, in all of the figs the identical mark of use is represented same or analogous part.In addition, although the term used in the application selects from public term, but some terms mentioned in present specification may be that applicant selects by his or her judgement, its detailed meanings illustrates in the relevant portion of description herein.In addition, require not only to pass through used actual terms, but the meaning that also will be contained by each term understands the application.
For the existing spectrophotometric problems described in background technology, the embodiment of the application provides a kind of for spectrophotometric optical texture, wherein by light balancing device, to the light beam on testing sample, dodging is carried out to light source irradiation, then the uniform beam after dodging is made to pass through testing sample, eliminate the impact that light source irradiation is measured to uneven and in time the fluctuation spatially of the beam distribution on testing sample testing sample thus, raising measuring accuracy.
Fig. 1 is the spectrophotometric schematic diagram of the optical texture of the embodiment comprised according to the application.The spectrophotometer of Fig. 1 comprises light source 1, light source convergent lens 2, incident optical 3, light balancing device 4, collimation lens 5, sample cell 6, convergent lens 7, outgoing optical fiber 8, entrance slit 9, reflection grating 10, catoptron 11, ccd detector 12.As shown in Figure 1, the light beam that light source 1 sends arrives light source convergent lens 2, and this light source convergent lens 2, between light source 1 and light balancing device 4, is assembled for the light beam provided light source, and light beam arrives incident optical 3 after light source convergent lens 2 is assembled.Light beam incides the incident end face of light balancing device 4 after incident optical 3 with certain emergence angle.Light beam arrives collimation lens 5 after the even light of light balancing device 4, collimation lens 5 is between light balancing device 4 and sample cell 6, for collimating by the light beam after the even light of light balancing device 4, light beam passes through sample cell 6 with the form of parallel beam after collimation lens 5 collimates, in sample cell 6, be placed with testing sample.The convergent lens 7, outgoing optical fiber 8, slit 9 and the reflection grating 10 that are arranged by order according to light beam is there is after sample cell 6.After convergent lens 7 is assembled, arrived the incidence end of outgoing optical fiber 8 by the light beam after sample cell 6, light beam is irradiated to slit 9 from the exit ports of outgoing optical fiber 8 after outgoing optical fiber 8.Light beam, by being irradiated in reflection grating 10 after slit 9, after reflection grating 10 light splitting, uses 1 order diffraction light after grating beam splitting.Light beam after light splitting arrives on catoptron 11, and light beam is irradiated on ccd detector 12 and is received by ccd detector 12 after catoptron 11 reflection is assembled.
In the embodiment shown in fig. 1, the integrating rod of shown light balancing device 4 to be end faces be rectangle, the shape of two end faces is identical, as shown in the sectional view of Fig. 2.The material of integrating rod is fused silica glass.The light beam sent from light source 1 enters testing sample again after the dodging of light balancing device 4, and light distribution uneven and in time the fluctuation spatially entering the light beam of testing sample all can well be improved.Specifically, Fig. 3 A and 3B is same light beam when not by light balancing device and the schematic diagram by being irradiated to the one dimension light distribution on the surface of testing sample when light balancing device respectively, wherein transverse axis represents the size of the hot spot be radiated on sample surfaces, the initial point of transverse axis corresponds to the center of hot spot, and the longitudinal axis represents normalized relative light intensity.As can be seen from Fig. 3 A, when not by light balancing device, the light distribution be irradiated on sample surfaces is by force middle and the distribution of surrounding diminuendo.Relatively, as can be seen from Fig. 3 B, when by light balancing device, the light distribution be irradiated on sample surfaces is basic uniform distribution on the whole surface of sample.More known by Fig. 3 A and Fig. 3 B, the uneven incident beam of spatially light distribution will change the uniform outgoing beam of spatially light distribution into after by light balancing device.
The uneven light distribution being similar to the distribution of Gauss's rule of above Fig. 3 A description is only example, and the actual light source light distribution spatially used also may be the irregular light distribution of milli.The light beam light intensity distribution spatially no matter inciding light balancing device is rule distribution or irregular distribution, and the outgoing beam after light balancing device is all spatially uniform light beam.
On the other hand, light balancing device also plays uniform effect to light distribution change in time, and after even light, the light distribution of light beam fluctuation in time can reduce.Therefore, by using light balancing device that the light beam entering testing sample just can be made to become uniform beam, thus light beam spectrophotometric measuring error that is uneven and that bring in light distribution fluctuation in time is spatially reduced.
Although use end face is rectangle, material is fused silica glass integrating rod as light balancing device in the embodiment of the application as depicted in figs. 1 and 2, but embodiment described here is in order to illustration purpose, instead of in order to the application is limited to described precise forms.In other embodiments, integrating rod, microlens array that light balancing device can be other shape or be made up of other suitable material, and those of ordinary skill in the art read the application disclosure thinkable any suitable light balancing device and the material with even light action, these embodiments are also within the scope of the application.
What provide according to the above embodiment of the application carries out dodging by using light balancing device to the light beam be irradiated on testing sample for spectrophotometric optical texture, improve the light beam light intensity be irradiated on testing sample and be distributed in spatially uneven and fluctuation in time to the impact of spectroscopic measurements, overcome the problems such as existing spectrophotometric measurement is inaccurate, improve spectroscopic measurements precision.
Although describe structure or the device of the application according to the preferred embodiment, but those of ordinary skill in the art can understand, to the assembly of the device described in the application or the multiple modification of assembly arrangement application, and can not deviate from concept, the spirit and scope of the application.In addition, amendment can be made to disclosed structure or device, and get rid of the assembly that can describe from the application or substitute multiple assembly, and realize same or analogous result.To those of ordinary skill in the art apparent all these similar to substitute and amendment is regarded as within the spirit of the application limited by claims, scope and concept.
Claims (6)
1. for a spectrophotometric optical texture, it is characterized in that, comprising:
Light source, for providing light beam;
Sample cell, for placing testing sample; And
Light balancing device, described light balancing device is used for carrying out even light to the light beam that light source provides, and makes light beam after even light by the testing sample in sample cell.
2. optical texture as claimed in claim 1, is characterized in that, described light balancing device is positioned at before light beam enters testing sample.
3. optical texture as claimed in claim 1, it is characterized in that, described light beam carries out dodging before entering testing sample.
4. optical texture as claimed in claim 1, is characterized in that, described light balancing device be integrating rod or other have the device of even light action.
5. for a spectrophotometric optical system, it is characterized in that, comprising:
Optical texture as described in any one in above claim 1-4; And
Light source convergent lens, incident optical, collimation lens, convergent lens, outgoing optical fiber, slit, grating, catoptron, detector.
6. optical system as claimed in claim 5, is characterized in that,
Described light source convergent lens is used for sending described light source and the light beam arriving described light source convergent lens is assembled, and makes the light beam after light source convergent lens is assembled enter incident optical;
The incident end face of described incident optical for making light beam incide light balancing device with certain emergence angle after incident optical;
Described collimation lens is used for collimating the light beam after the even light of light balancing device, and makes the light beam after collimation lens collimation pass through sample cell with the form of parallel beam;
Described convergent lens is used for assembling by the light beam after sample cell, and makes the light beam after convergent lens is assembled arrive the incidence end of outgoing optical fiber;
Described outgoing optical fiber is irradiated to slit from the exit end of outgoing optical fiber for making light beam after outgoing optical fiber;
Described slit for make light beam pass through after be irradiated to grating;
Described grating is used for carrying out light splitting to light beam, and makes the light beam after light splitting arrive on catoptron;
Described catoptron is used for carrying out reflection to light beam and assembles, and makes the light beam irradiation after reflection is assembled on detector; And
Described detector is for receiving the light beam after catoptron reflection is assembled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310374196.6A CN104422515A (en) | 2013-08-23 | 2013-08-23 | Optical structure for spectrophotometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310374196.6A CN104422515A (en) | 2013-08-23 | 2013-08-23 | Optical structure for spectrophotometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870037A (en) * | 2016-09-23 | 2018-04-03 | 大塚电子株式会社 | spectroscopic measurement device |
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| CN1815196A (en) * | 2005-02-03 | 2006-08-09 | 三星电子株式会社 | Multi-channel fluorescence measuring optical system and multi-channel fluorescence sample analyzer |
| CN101281061A (en) * | 2008-01-16 | 2008-10-08 | 蔡小舒 | High resolution spectral measuring apparatus |
| CN202648796U (en) * | 2012-05-21 | 2013-01-02 | 广西工学院 | Multipurpose spectrophotometer |
| CN102879907A (en) * | 2011-07-14 | 2013-01-16 | 光焱科技股份有限公司 | Light splitting device capable of improving light uniformity |
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2013
- 2013-08-23 CN CN201310374196.6A patent/CN104422515A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815196A (en) * | 2005-02-03 | 2006-08-09 | 三星电子株式会社 | Multi-channel fluorescence measuring optical system and multi-channel fluorescence sample analyzer |
| CN101281061A (en) * | 2008-01-16 | 2008-10-08 | 蔡小舒 | High resolution spectral measuring apparatus |
| CN102879907A (en) * | 2011-07-14 | 2013-01-16 | 光焱科技股份有限公司 | Light splitting device capable of improving light uniformity |
| CN202648796U (en) * | 2012-05-21 | 2013-01-02 | 广西工学院 | Multipurpose spectrophotometer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107870037A (en) * | 2016-09-23 | 2018-04-03 | 大塚电子株式会社 | spectroscopic measurement device |
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Application publication date: 20150318 |