CN203572578U - Portable Fourier near-infrared spectroscopy - Google Patents
Portable Fourier near-infrared spectroscopy Download PDFInfo
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- CN203572578U CN203572578U CN201320718574.3U CN201320718574U CN203572578U CN 203572578 U CN203572578 U CN 203572578U CN 201320718574 U CN201320718574 U CN 201320718574U CN 203572578 U CN203572578 U CN 203572578U
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Abstract
The utility model relates to a portable Fourier near-infrared spectroscopy, which solves the problems that the qualitative and quantitative results are influenced since the existing near-infrared spectroscopy is poor in vibration resistance and temperature vibration resistance, and the spectrum baseline deforms. An interferometer bracket (1), a beam splitter (2), a fixed mirror (3) and a compensating mirror (4) are fixed parts and are assembled together, a movable mirror (5) is a three-dimensional angle mirror, a shaft of a voice coil motor (7) is connected with a shaft of the fixed mirror (3) through a cantilever spring (8) to form a movable mirror driving motor (6), and the devices, a light source (9), a laser device (10), a laser detector (11), an emergent light transmitting device (12), an optical fiber (13), an incident light receiving device (14), a detector (15) and a main control circuit board are fixed on an optical bottom platform.
Description
technical field:
The utility model is relevant with Fourier Transform Near Infrared instrument.
background technology:
The core component of Fourier Transform Near Infrared instrument is interferometer.The basic demand of interferometer is that index glass should remain unchanged at the beam path alignment of moving process Instrumental.The simplest index glass is level crossing, if but level crossing has the rotation of inclination or translation motion, and the beam path alignment of interferometer all can change.One class solution is with the skew of laser detection index glass, on horizontal glass, is adjusted, so-called " dynamically adjusting ", as power & light company, Agilent company are used this technology, the shortcoming of such solution is very responsive, and anti-vibration and resisting temperature changing capability are poor, is only suitable for laboratory and uses.An other class solution is that index glass adopts solid angle catoptron, and the problem that this has solved vibration to a great extent, is therefore adopted by the external Fourier transform spectrometer, of Brooker and many families of ABB AB producer.The problem of such solution is the skew that solid angle mirror system does not solve shear direction, and therefore, in the situation that temperature variation is larger, spectrum baseline can produce distortion, thereby affects the result of qualitative, quantitative.
utility model content:
The utility model object is to provide one and possesses high-resolution, wide region, anti-vibration, the portable Fourier near infrared spectrometer of resistance to temperature variation.
The utility model is achieved in that
Portable Fourier near infrared spectrometer, interferometer support 1 is fixed part with beam splitter 2, horizontal glass 3, together, fixing compensating glass 4 is vertical with light path for assembled in advance.Index glass 5 is three-dimensional angle mirrors, the beam warp cantilever spring 8 of voice coil motor 7 connects to form index glass CD-ROM drive motor 6 with the axle of index glass 5, and above-mentioned device is fixed on optics base frame together with light source 9, laser instrument 10, laser detector 11, emergent light dispensing device 12, light transmitting fiber 13, incident light receiving trap 14, detecting device 15, main control board.
Interferometer support 1 and beam splitter 2, horizontal glass 3 are used the material assemble welding all-in-one-piece single part of same thermal expansivity.
The phosphor bronze spring of cantilever spring after by thermal treatment made, and the axle of cantilever spring 8 and voice coil motor 7, the axle of index glass 5 are coaxial.
The utility model is high-resolution, wide region, anti-vibration, the high-performance portable Fourier near infrared spectrometer of resistance to temperature variation.The interferometer index glass deflection that the existing Fourier Transform Near Infrared instrument of solution brings in strong vibration, the light path misalignment that translation causes and the problem of scanning errors.Realize the fixing all-in-one-piece design of interferometer component, realize forever collimation, anti-vibration, adapts on a large scale the performances such as temperature variation; By the load carrier of index glass scanning, by bearing, change spiral arm spring into, design compensation circuit, extraordinary life-span of sweep stabilization and driver part.The core light splitting part of portable Fourier transform spectrometer, is interferometer scanning system, high-quality interferometer scanning system, require index glass on driving bearing, to keep the uniform motion of single shaft, guarantee that index glass scanning, along straight line moving at the uniform velocity, is the gordian technique that obtains high-quality spectrum.We adopt cantilever spring driving bearing, use voice coil motor to drive three dimensional angular reflection index glass to complete scanning.The advantage of this scanning system be operate steadily, single shaft performance is high, deviation is little, the life-span is long, compact conformation, cost are lower.
The miniaturization interferometer of design: guarantee high-resolution, wide test specification, also will guarantee anti-vibration, adapt to temperature variation on a large scale.Interferometer main body is fixed into an entirety, and interferometer is permanent collimation.。
Support the bearing structure of scanning index glass: this structure is to use spiral arm spring, and sweep stabilization and drive system are never wornout.The unlimited service life design of driver part.
The core light splitting part of Fourier transform spectrometer, is interferometer, and it is comprised of a beam splitter and multiple catoptron.Wherein light splitting part is beam splitter, and near infrared is used low hydroxyl quartz material as beam splitter, and its spectral range is 0.7 ~ 2.5 micron.Catoptron is comprised of horizontal glass and index glass, when the illumination of light source transmitting is mapped to after beam splitter, is divided into two-beam is irradiated to respectively horizontal glass and index glass by beam splitter, because index glass motion causes producing optical path difference with horizontal glass, forms interference light.
Interferometer support, beam splitter, optical path compensation mirror, horizontal glass are fixed part, need assembled in advance together and adjust to be collimated to the best.Because each optics need to add adjustment screw conventionally, for the use under laboratory condition, this adjustment mode can not brought large problem, but for the very large portable or on-the-spot use of vibration, this mode is just easy to cause light path imbalance.In addition, the parts of unlike material are assembled together, because the variation of temperature (particularly under field work condition) is very easy to produce stress difference, cause light path imbalance.
The utility model is used interferometer support and beam splitter and horizontal glass assemble welding all-in-one-piece single part of material of same thermal expansivity, so just do not use any adjustment screw, just can be permanently fixed into an entirety, can be referred to as the interferometer of " forever calibration ".The impact that can avoid like this vibration and temperature variation to bring to interferometer main body.
Because index glass motion and horizontal glass produce optical path difference, obtain interference light, the index glass small error of moving all can affect the performance of overall instrument.Therefore, the design of index glass and the driving of index glass become vital part in interferometer and even complete machine.
Index glass has six issuable freedoms of motion, i.e. three translation directions and three sense of rotation.In one of them direction of translatory motion, because scanning motion will produce optical path difference, the skew of other any one degree of freedom, all can cause the path-length error in interferometer.
In laboratory environment, can be by the skew of mechanical means restriction index glass or by automatically adjusting index glass horizontal glass angle modification error.But portable instrument is in the environment of height vibration, and restriction skew is just very difficult.Adopt 3 D stereo angle mirror as index glass, can make incident light and emergent light keeping parallelism under index glass skew, just can revise the deviation of three rotations and a translation.This mode is used to the design of a lot of near infrared interferometers of vehicle-mounted and online Fourier and adopts.
In design using three-dimensional angle mirror as index glass, the skew of shear direction is due to temperature variation, the inner stress that produces of mirror body and drive unit, and this variation 3 D stereo angle mirror cannot overcome.So in actual measurement, temperature variation can cause measuring the skew of spectrogram baseline.Under laboratory environment, because temperature variation is little, this skew can be ignored; And portable instrument temperature change in outdoor environment is large, this skew will bring obvious problem.
The utility model adopts a compensating glass to be contained in index glass limit, make incident light and reflected light completely on a paths, thereby the skew of shear direction is revised, fixing compensating glass is forever vertical with light path, if the skew of three-dimensional angle mirror generation shear direction, the light of returning by compensating glass vertical reflection and incident light are still on same path.
The index glass system of design, can revise the skew in all directions thus, can guarantee steady operation under the environment of vibration and temperature variation, and this is also the necessary requirement of portable instrument.This interferometer equilibrium temperature will be from 15-30 ° of be significantly promoted to-20-40 of C ° C.
Interferometer scanning is exactly the scanning of index glass, need to guarantee uniform sweep velocity, removes the impact of disturbing, and will prevent in design the wearing and tearing of motion bearings simultaneously, and this will cause scanning errors.
Scanning driving device drives fore-and-aft direction motion by a set of voice coil motor, and the front end of driving shaft is installed index glass.General driving shaft moves on lubricated bearing, when the bearing of driving shaft carries out fast, works for a long time, thereby be easy to heating, accelerates the wearing and tearing of bearing.The utility model is arranged on driving shaft on cantilever spring mobile device, and the motion of index glass is almost perfect single shaft, has avoided wearing and tearing completely.The phosphor bronze spring of cantilever spring after by thermal treatment made, and its expected life is far away for a long time in the life-span of instrument.
The utility model designs according to Fourier transform principle, its ultimate principle is that light source luminescent is equally divided into transmitted light and reflected light through beam splitter by light, this two-beam makes two-beam produce interference through the motionless catoptron (horizontal glass) of one side and the movable catoptron (index glass) of one side, interference light irradiates after sample, collects interference spectrum and through Fourier transform, generates sample single channel spectrum again.Beam splitter, index glass and horizontal glass three form the basic structure of interferometer, the distance control that its resolution is moved by index glass and adjustable.
The utility model has following characteristics:
High wavelength accuracy: the inner one-wavelength laser that uses of Fourier Transform Near Infrared instrument is as controlling of sampling standard, at 0.05cm
-1its wavelength accuracy is compared with grating type and the high order of magnitude of Fourier's polarization interference nir instrument, therefore, user does not need often instrument to be carried out to the artificial wavelength calibration in outside, and high wavelength accuracy is the greatest factor that model can be delivered to from an instrument another instrument.
Spectral resolution is high: Fourier Transform Near Infrared instrument does not have the concept of slit, the distance that index glass moves determines resolution, its resolution is compared with high several times of traditional raster type and Fourier's polarization interference nir instrument, has obvious advantage when research structure similar substance or complicated potpourri.
Nature parasitic light does not affect test result: Fourier Transform Near Infrared instrument only detects from interferometer interference light out because through the natural parasitic light of interferometer modulation on gained spectrum without impact.
High s/n ratio, low detectability: the luminous flux of Fourier Transform Near Infrared instrument is large, and sweep velocity is fast, in identical sweep time, equality detector and same spectral range, the signal to noise ratio (S/N ratio) of spectrum can arrive 1000:1, and therefore the disturbing factor of low content component is few, and the detectability of instrument is low.
Wavelength accuracy is high: its wavelength accuracy of Fourier transform nir instrument is than high 1 order of magnitude of grating type instrument, high several times of resolution, and resolution can be adjustable according to analytic target, be not only applicable to conventionally test and be applicable to new method research and development yet, not only can test conventional index, and can the very close material of test structure, as sulphur glucoside of each seed amino acid, various fatty acid, different structure etc., the test result of same sample is all better than optical filter and grating type instrument, has very strong application extension ability.
accompanying drawing explanation:
Fig. 1 is the utility model structural drawing.
Fig. 2 is that index glass adds the anti-interference light path of compensating glass.
Fig. 3 is index glass drives structure figure.
embodiment:
Interferometer is by interferometer support 1, and beam splitter 2, horizontal glass 3, compensating glass 4 and index glass form, and wherein index glass 5 is to adopt three-dimensional angle mirror.Interferometer support 1, beam splitter 2, horizontal glass 3 are fixed part, need assembled in advance together.Voice coil motor 7 forms index glass CD-ROM drive motor with cantilever spring 8 and is connected by driving shaft with three-dimensional angle mirror.Former device is fixed on instrument lightweight optics base frame together with light source 9, laser instrument 10, laser detector 11, emergent light dispensing device 12, light transmitting fiber 13, incident light receiving trap 14, detecting device 15, main control board above.Light source 9, laser instrument 10, laser detector 11, emergent light dispensing device 12, light transmitting fiber 13, incident light receiving trap 14, detecting device 15, main control board are identical with the similar device of conventional Fourier transform near infrared spectrometer.Interferometer support 1 and beam splitter 2, horizontal glass 3 are used assemble welding all-in-one-piece single part of material of same thermal expansivity.
Fixing compensating glass is forever vertical with light path.
The phosphor bronze spring of cantilever spring after by thermal treatment made, and the axle of cantilever spring 8 and voice coil motor 7, the axle of index glass 5 are coaxial.
Claims (3)
1. portable Fourier near infrared spectrometer, it is characterized in that interferometer support (1) and beam splitter (2), horizontal glass (3) is assembled together for fixed part, fixing compensating glass (4) is vertical with light path, index glass (5) is three-dimensional angle mirror, the beam warp cantilever spring (8) of voice coil motor (7) connects to form index glass CD-ROM drive motor (6) with the axle of index glass (5), above-mentioned device is together with light source (9), laser instrument (10), laser detector (11), emergent light dispensing device (12), light transmitting fiber (13), incident light receiving trap (14), detecting device (15), main control board is fixed on optics base frame.
2. portable Fourier near infrared spectrometer according to claim 1, is characterized in that interferometer support (1) and beam splitter (2), horizontal glass (3) are used the material assemble welding all-in-one-piece single part of same thermal expansivity.
3. portable Fourier near infrared spectrometer according to claim 1, is characterized in that the phosphor bronze spring after cantilever spring is by thermal treatment is made, and the axle of cantilever spring (8) and voice coil motor (7), the axle of index glass (5) are coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718574.3U CN203572578U (en) | 2013-11-15 | 2013-11-15 | Portable Fourier near-infrared spectroscopy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320718574.3U CN203572578U (en) | 2013-11-15 | 2013-11-15 | Portable Fourier near-infrared spectroscopy |
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| CN203572578U true CN203572578U (en) | 2014-04-30 |
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| CN201320718574.3U Expired - Lifetime CN203572578U (en) | 2013-11-15 | 2013-11-15 | Portable Fourier near-infrared spectroscopy |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404680A (en) * | 2016-11-10 | 2017-02-15 | 赣州市检验检疫科学技术研究院 | Device and method for field quick on-site detection of citrus huanglongbing |
| CN107407601A (en) * | 2015-02-02 | 2017-11-28 | 福斯分析仪器公司 | For the spectrometer system and method for the time cycle disturbance for compensating the interference pattern as caused by spectrometer system |
| CN107894208A (en) * | 2016-10-04 | 2018-04-10 | 普莱斯泰克光电子有限公司 | Spectral Confocal range sensor |
| CN108519344A (en) * | 2018-03-07 | 2018-09-11 | 中船重工安谱（湖北）仪器有限公司 | A kind of Multi-Component Gas Analyzing Fourier infrared spectrograph |
| CN113739918A (en) * | 2020-05-27 | 2021-12-03 | 中国科学院微电子研究所 | Polarization-preserving reflective near-infrared Fourier transform polarization spectrometer |
| CN113804646A (en) * | 2020-06-12 | 2021-12-17 | 中国科学院微电子研究所 | Near-infrared Fourier transform polarization spectrometer |
| WO2023042454A1 (en) * | 2021-09-14 | 2023-03-23 | 株式会社島津製作所 | Fourier transform infrared spectrophotometer |
-
2013
- 2013-11-15 CN CN201320718574.3U patent/CN203572578U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407601A (en) * | 2015-02-02 | 2017-11-28 | 福斯分析仪器公司 | For the spectrometer system and method for the time cycle disturbance for compensating the interference pattern as caused by spectrometer system |
| CN107407601B (en) * | 2015-02-02 | 2021-01-05 | 福斯分析仪器公司 | Spectrometer system and method for compensating for time-periodic perturbations of an interferogram produced by the spectrometer system |
| CN107894208A (en) * | 2016-10-04 | 2018-04-10 | 普莱斯泰克光电子有限公司 | Spectral Confocal range sensor |
| CN107894208B (en) * | 2016-10-04 | 2021-09-14 | 普莱斯泰克光电子有限公司 | Spectrum confocal distance sensor |
| CN106404680A (en) * | 2016-11-10 | 2017-02-15 | 赣州市检验检疫科学技术研究院 | Device and method for field quick on-site detection of citrus huanglongbing |
| CN108519344A (en) * | 2018-03-07 | 2018-09-11 | 中船重工安谱（湖北）仪器有限公司 | A kind of Multi-Component Gas Analyzing Fourier infrared spectrograph |
| CN113739918A (en) * | 2020-05-27 | 2021-12-03 | 中国科学院微电子研究所 | Polarization-preserving reflective near-infrared Fourier transform polarization spectrometer |
| CN113739918B (en) * | 2020-05-27 | 2023-09-26 | 中国科学院微电子研究所 | Polarization-preserving reflective near-infrared Fourier transform polarization spectrometer |
| CN113804646A (en) * | 2020-06-12 | 2021-12-17 | 中国科学院微电子研究所 | Near-infrared Fourier transform polarization spectrometer |
| CN113804646B (en) * | 2020-06-12 | 2023-11-07 | 中国科学院微电子研究所 | Near infrared Fourier transform polarization spectrometer |
| WO2023042454A1 (en) * | 2021-09-14 | 2023-03-23 | 株式会社島津製作所 | Fourier transform infrared spectrophotometer |
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Granted publication date: 20140430 |