CN106153575A - A kind of acousto-optic modulation double light path double detector type near infrared spectrometer and method of testing - Google Patents
A kind of acousto-optic modulation double light path double detector type near infrared spectrometer and method of testing Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/066—Modifiable path; multiple paths in one sample
- G01N2201/0668—Multiple paths; optimisable path length
Abstract
The invention discloses a kind of acousto-optic modulation double light path double detector type near infrared spectrometer and method of testing.This instrument includes spectrum analysis optics, radio-frequency driven module, signal acquisition module, control and processing module, power module, cuvette sample test structure.This invention uses the design of double light path double detector, in conjunction with reference light when testing in order without vessel, pocket ware and contain sample vessel and the method for testing of measurement optical signal, reach effectively to reduce the purpose of the test error that flashing is determined, two detector differences, environmental disturbances, sample vessel difference etc. cause by integrated data processing.
Description
Technical field:
The present invention relates to the improvement of real time spectrum analytical technology, refer specifically to a kind of based on acousto-optic tunable filter light splitting side
Formula, utilizes beam splitter to realize the controlled monochrome signal light of energy splitting ratio and reference light, and uses double light path double detector in due order
Sequence test without vessel, pocket ware, containing reference light during sample vessel and measurement optical signal method of testing, at synthetic data
Reason realizes effectively reducing test error, belongs to field of photoelectric technology.
Background technology:
Along with the progress of Chemical Measurement, optical fiber and computer technology, spectral analysis technique is as " green test technology "
Representative, possess and be effectively improved analysis efficiency, reduce the artificial and advantage of production cost, and acquirement develops rapidly.At present, spectrum
Analytical technology plays the most important angle in analysis field tests, especially on-line analysis test and industrial control field
Color.In general, spectrometric instrument because analyzing that speed is fast, applied widely and the advantage such as non-destructive on-line checking,
Analytical and testing instrument occupies critical role, is widely used in including including agriculture and animal husbandry, food, chemical industry, petrochemical industry, pharmacy, Nicotiana tabacum L. etc.
Many practical fields.
Acousto-optic tunable filter (Acousto-optic tunable filter, AOTF) is a kind of narrow-band tunable filter
Light device, it is the light-splitting device made according to acousto-optic interaction principle.When a branch of polychromatic light by a dither there is light
When learning elastic crystal, the monochromatic light of a certain wavelength will produce diffraction at crystals, transmits from crystal with an angle
Come, do not occur the polychromatic light of diffraction then along the former light direction of propagation directly transmitted through crystal, thus reach the purpose of light splitting.Pass through
The frequency changing the radio-frequency driven being applied on crystal selects light splitting wavelength, thus realizes length scanning.At present, can based on acousto-optic
The spectrometric instrument development of tunable filter is the most still in the starting stage, and business-like product is rarely reported.Correlator
The development of device system remains some technical bottlenecks, be mainly reflected in spectral resolution, detection sensitivity, picking rate with
And on the adaptability of Multi-example detection.
Literature survey finds, for the settling mode (patent of the light-dividing principle based on AOTF that above-mentioned technological difficulties propose
CN 201210511740), it is provided that a kind of AOTF type near infrared spectrometer using dutycycle control technique, by controlling pulse
Generator and RF driving source realize the dutycycle to radio frequency output signal and arrange, so that acousto-optic tunable filter is by controlling
Requirement is scanned light splitting, to reach to improve spectral resolution and the purpose of detection sensitivity.But which there is also certain
Limitation, is mainly reflected in that instrument photosignal obtains light path and both cannot eliminate the light intensity fluctuation change that flashing causes surely,
Also the error impact that environmental disturbances introduces cannot be eliminated.It addition, the discordance of sample vessel during which is actually detected
Also the spectral measurement accuracy to testing sample can be affected.
Summary of the invention:
The deficiency existed for prior art, the present invention provides spectrometric instrument and the survey of a kind of double light path double detector
Method for testing, effectively to reduce the test error that flashing is determined, environmental disturbances, sample vessel difference cause.
The main design thought of this invention is:
1) select acousto-optic turnable filter as light-splitting device, use the design of double light path double detector, through acousto-optic tunable
Monochromatic light after light filter light splitting is divided into the controlled reference light of energy splitting ratio by adjustable beam splitter and measures light, wherein reference light
Signal is received by reference path and corresponding light electric explorer, measures light and is first incident to sample cell, its transmission (or reflection) light
Signal is received by optical path and corresponding light electric explorer
2) use in order test without vessel, pocket ware, containing reference light during sample vessel and measurement optical signal, comprehensively enter
The method that row data process, effectively reduction flashing are fixed, two detector differences, environmental disturbances, sample vessel difference etc. cause
Test error；
3) before sample test, according to testing sample optical characteristics, in conjunction with adjustable diaphragm and utilize adjustable beam splitter to reference
Light and the energy of measurement light and splitting ratio are adjusted, and make both energy suitable and magnitude is close, improve instrument dynamic range also
Strengthen the effectiveness of test data.
The present invention is described as follows:
1, spectrometric instrument of the present invention includes that spectrum analysis optics (1), radio-frequency driven module (2), signal are adopted
Collection module (3), control and processing module (4), power module (5), cuvette sample test structure (6), as shown in Figure 1.Wherein
Spectrum analysis optics includes that light source (101), off axis paraboloid mirror convergent mirror (102), adjustable diaphragm (103), off axis paraboloid mirror collimate
Mirror (104), AOTF (105), collecting lens (106), adjustable beam splitter (107)；Radio-frequency driven module include DDS chip (201),
Radio-frequency transformer (202), LC low-pass filtering (203), low-noise amplifier (204), power amplifier (205), SP2T radio frequency leave
Close (206)；Signal acquisition module include reference signal detector (301), reference signal detector pre-amplification circuit (302),
Test signal sensor (303), test signal sensor pre-amplification circuit (304), phase-locked amplifying circuit (305), A/D data
Acquisition Circuit (306)；Control and processing module includes FPGA software (401) and host computer (402)；Power module includes once electricity
Source (501), secondary power supply (502)；Cuvette sample test structure includes cuvette (601), changeable cuvette support
(602)。
Source light is assembled by 2, described spectrum analysis optics, after space filtering and collimation, by AOTF (105), by
Control and processing module (4) controls radio-frequency driven module (2) and drives light splitting, the measurement monochromatic light needed for formation；This monochromatic light by
After collecting lens (106) is assembled, in conjunction with the optical characteristics of testing sample and reference light and measurement light detecting signal value, by tunable optical
Door screen (103) realizes luminous energy magnitude control and surveys, adjustable beam splitter (107) realize reference light and measure the adjustment of light splitting ratio, Liang Zhejie
Close realize reference light and measure light energy is suitable and magnitude is close to controlling.
3, described cuvette sample test structure, in conjunction with method of testing, changeable cuvette support (602) realizing will
Cuvette (601) is in A, B, the switching of location of C, it is achieved reference when testing in order without vessel, pocket ware and contain sample vessel
Light and measure optical signal, integrated data processing reduces that flashing is fixed, two detector differences, environmental disturbances, sample vessel
The purpose of the test error that difference etc. cause.
4, integrated data processing of the present invention, obtains without vessel, pocket ware combining measuring method and contains sample device
Reference light during ware and after measuring optical signal, is handled as follows:
1) by the measurement light spectrum I without vessel2 nothingsWith reference light spectrum I1 nothingProcess by formula 1, obtain without measurement during vessel
Spectral energy proportionate relationship constant vector C of light and reference light, sets up reference light and the incident intrinsic relation measuring light.Now,
The synchronism detection value measuring light and reference light includes the impact of light source, optics, detector and circuit thereof, environmental disturbances,
Process for follow-up data can reduce that flashing is fixed, detector and circuit differences, the impact of environmental disturbances；
2) by the measurement light spectrum I of pocket ware2 is emptyWith reference light spectrum I1 is emptyProcess by formula 2, set up reference light and pass through device
The intrinsic relation of measurement light after ware, obtains spectral-transmission favtor T of vessel itselfEmpty, process for follow-up data and can eliminate sample device
The impact of ware difference；
3) by the measurement light spectrum I containing sample vessel2 contain sampleWith reference light spectrum I1 contains sampleProcess by formula 3, set up reference light with
By containing the intrinsic relation of measurement light after sample vessel, obtaining Optical transmission spectrum T containing sample vesselContaining sample。
4) combining reference light with by containing the intrinsic relation of measurement light after sample vessel, and Optical transmission spectrum, through formula
4, formula 5 processes, available sample self Optical transmission spectrum curve and absorbance.
By Lambert-Beer's law:
Wherein, the absorbed proportionality coefficient of K light, c sample concentration, l light path, T transmittance, A absorbance.
It is apparent from, AContaining sample=AEmpty+ASample
Therefore can derive:
Testing procedure of the present invention as shown in Figure 2, is described as follows:
1, reference light and the energy of measurement light and splitting ratio are adjusted: test structure containing sample vessel state (is only in
For regulating), utilize adjustable diaphragm and adjustable beam splitter that reference light and energy and the splitting ratio measuring light are adjusted, make two
Person's signal is suitable and magnitude is close；
2, without vessel reference light and measurement optical tests: remove the cuvette on cuvette support, test reference light and measurement
Optical signal, stores pending；
3, pocket ware reference light and measurement optical tests: pocket ware is loaded cuvette support, test reference light and measurement light
Signal, stores pending；
4, containing sample vessel reference light and measurement optical tests: load testing sample by upper step has been surveyed pocket ware, put into
Cuvette support, test reference light and measurement optical signal, store pending；
5, data process；
6, this testing experiment is completed.
The advantage of this patent is:
1) design of double light path double detector is used, reference when testing in order without vessel, pocket ware and contain sample vessel
Light and measurement optical signal, integrated data processing, effectively reduction flashing are fixed, two detector differences, environmental disturbances, sample vessel
The test error that difference etc. cause；
2) according to testing sample optical characteristics before test, utilize adjustable diaphragm and adjustable beam splitter to reference light and measurement
Energy and the splitting ratio of light are adjusted, and make both signals suitable and magnitude is close, improve the effectiveness of test data.
Accompanying drawing illustrates:
Fig. 1 is spectrometric instrument theory diagram of the present invention,
Wherein, 1-spectrum analysis optics, 2-radio-frequency driven module, 3-signal acquisition module, 4-control and processing module, 5-
Power module, 6-cuvette sample test structure.
Fig. 2 is testing procedure flow chart.
Detailed description of the invention:
A preferable embodiment of this patent that according to Fig. 1 provide is presented herein below, in order to the architectural feature of this patent to be described
With implementation rather than be used for limiting the scope of this patent.
Double light path double detector type near infrared spectrometer based on acousto-optic tunable filter includes following components:
(1) wide spectrum halogen light source 101: select the Halogen of Ou Silang Lighting Co., Ltd of Germany in the present embodiment
Display/Optic Lamp, its rated power 20W, rated voltage 12V.
(2) off-axis parabolic mirror 102,104: select Beijing Mao Feng Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 in the present embodiment
OQALM76.2-002, OQALM25.4-001 type off axis paraboloidal mirror, single burnt a length of 38.1mm and 12.7mm.
(3) adjustable aperture diaphragm 103: selecting the D5S adjustable aperture diaphragm of Thorlabs company in the present embodiment, aperture is straight
Footpath 0.7mm-5mm.
(4) acousto-optic tunable filter 105: select the short of science and technology group 26 of China Electronics Research Institute in the present embodiment
Ripple near-infrared acousto-optic tunable filter.
Its specific targets are:
(5) adjustable beam splitter 107: in the present embodiment this device by one-dimensional manual accurate translation stage and cut light microscopic self-control and
Become.
(6) photodetector 301,303: select the J23TE3-66C-R01M-of Judson company of the U.S. in the present embodiment
2.6 type detectors, a diameter of 1mm of photosurface.
(7) cuvette in cuvette sample test structure 6: selecting material is JGS2 quartz glass cuvette, cuvette
Support is self-made components.
(8) radio-frequency driven module 2 is self-control circuit board, mainly includes that FPGA controller, radiofrequency signal based on DDS occur
Device, radio-frequency transformer, LC low pass filter, low-noise amplifier, power amplifier, SP2T radio-frequency (RF) switch etc..
(9) power module 5 is self-control circuit board, and wherein secondary power supply 502 uses DC-DC module, model to be respectively DF20-
24D12, DF20-24S15, DFB10-24S5, the DC-DC conversion of master control power module uses the integrated voltage-stabilized chip of LT company,
Maximum output current is up to 3A.
(10) signal acquisition module is self-control circuit board, including two-way detector and preposition amplification, phase-locked amplification, A/D number
According to collection, and FPGA.
(11) host computer uses the desktop computer of Legend Company's production with computer, and upper computer software therein is soft from establishment
Part.
Test and data processing step be:
1, reference light and the energy of measurement light and splitting ratio are adjusted
Test structure is in the vessel state containing sample (being only used for initial adjustment), utilizes adjustable diaphragm and adjustable beam splitter pair
Reference light and the energy of measurement light and splitting ratio are adjusted, and make both signals suitable and magnitude is close；
2, sample test
Open wide spectrum halogen light source 101, through off-axis parabolic mirror 102, adjustable aperture diaphragm 103, throw off axis
Parabolic mirror 104 collimates the polychromatic light incidence acousto-optic tunable filter 105 after parallel processing；Testing sample is placed in colorimetric
In ware sample cell 6, controlling and the RF driving signal of processing module 4 output modulation, this driving signal drives acousto-optic tunable filter
Light device 105；The modulated monochromatic light obtained after light splitting is divided into reference light and survey by beam splitter 107 after overconvergence collimating mirror group 106
Amount light two ways of optical signals, reference path signal is received by reference path photodetector 301, measures light incidence cuvette sample cell
6, transmission (or reflection) optical signals optical path photodetector 303 receives；Signal acquisition module utilizes phase-locked amplification phase
Close demodulation techniques and extract two-way photosignal, be uploaded to computer, thus complete the acquisition process of spectral information.
3, data process
Utilize aforementioned formula 2, formula 3, formula 4, can obtain the transmittance spectrum of required sample:
The data recording series of samples, are all done by host computer processed as above, then preserve.Give over to follow-up quantitative
The various application such as analysis.
This method of testing is simple, and light path is easy, workable, and the design of double light path double detector and combination are in order
Reference light when testing without vessel, pocket ware and contain sample vessel and the method for testing of measurement optical signal, can effectively reduce light source
The test error that instability, two detector differences, environmental disturbances, sample vessel difference etc. cause, improves measuring accuracy, is more
Preferably Near-Infrared Spectroscopy Instruments.
Claims (2)
1. an acousto-optic modulation double light path double detector type near infrared spectrometer, including spectrum analysis optical module, radio-frequency driven
Module, signal acquisition module, control and processing module, power module, cuvette sample test structure, it is characterised in that:
Described spectrum analysis optical module include light source (101), off axis paraboloid mirror convergent mirror (102), adjustable diaphragm (103),
Off axis paraboloid mirror collimating mirror (104), AOTF (105), collecting lens (106), adjustable beam splitter (107)；Light source (101) sends
Light is through off axis paraboloid mirror convergent mirror (102) convergence, adjustable diaphragm (103) space filtering and off axis paraboloid mirror collimating mirror (104)
After collimation, by AOTF (105), by controlling and processing module (4) control radio-frequency driven module (2) driving light splitting, formed required
Measurement monochromatic light by collecting lens (106) assemble after, by adjustable beam splitter (107) press reference light and measurement light energy suitable
And magnitude is close to determining that splitting ratio is distributed, forming reference light and measure light, reference light enters cuvette sample test structure (6),
Two-way light is the most corresponding afterwards is detected by reference signal detector (301) and test signal sensor (303), forms double light path double
Detector optical system for testing；Reference light and measure light and combine the optical characteristics of testing sample and reference light and measurement light detecting signal
Value, is realized luminous energy magnitude by adjustable diaphragm (103) and controls, adjustable beam splitter (107) realize reference light and measure light splitting ratio
Adjust, finally make reference light and to measure the energy of light suitable and magnitude is close；Each module is powered respectively by power module (5)；
Described cuvette sample test structure (6) includes cuvette (601), changeable cuvette support (602), in conjunction with test
Method, is realized cuvette (601) in A, B, the switching of location of C by changeable cuvette support (602), and spectrogrph is accordingly
Reference light when realizing without vessel, pocket ware and contain sample vessel and the test of measurement optical signal.
2. a test side based on acousto-optic modulation double light path double detector type near infrared spectrometer a kind of described in claims 1
Method, it is characterised in that method step is as follows:
Near infrared spectrometer obtain without vessel, pocket ware and containing sample vessel time reference light and measurement optical signal after, carry out as
Lower process:
1) by the measurement light spectrum I without vessel2 nothingsWith reference light spectrum I1 nothingProcess by formula 1, obtain without measurement light during vessel and
Spectral energy proportionate relationship constant vector C of reference light, sets up reference light and the incident intrinsic relation measuring light；
2) by the measurement light spectrum I of pocket ware2 is emptyWith reference light spectrum I1 is emptyProcess by formula 2, set up reference light with by vessel after
The intrinsic relation of measurement light, obtain spectral-transmission favtor T of vessel itselfEmpty；
3) by the measurement light spectrum I containing sample vessel2 contain sampleWith reference light spectrum I1 contains sampleProcess by formula 3, set up reference light and pass through
Containing the intrinsic relation of measurement light after sample vessel, obtain Optical transmission spectrum T containing sample vesselContaining sample；
4) combining reference light with by containing the intrinsic relation of measurement light after sample vessel, and Optical transmission spectrum, through formula 4, public
Formula 5 processes, available sample self Optical transmission spectrum curve and absorbance；
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| CN106841065B (en) * | 2017-01-03 | 2020-09-15 | 中国科学院上海光学精密机械研究所 | Ultraviolet-visible light-near infrared transmission and reflection spectrum measuring device and measuring method |
| CN108279209A (en) * | 2018-04-11 | 2018-07-13 | 中国石油大学(华东) | A kind of more gas detecting systems of wave-length coverage and wavelength continuously adjustable |
| CN109030365A (en) * | 2018-08-20 | 2018-12-18 | 中国科学院上海技术物理研究所 | A kind of spectrum detection instrument and method of universal type modular |
| CN109001153A (en) * | 2018-10-12 | 2018-12-14 | 四川长虹电器股份有限公司 | Near infrared spectrometer based on radio communication |
| CN109682787A (en) * | 2019-02-28 | 2019-04-26 | 中国科学院烟台海岸带研究所 | A kind of phase demodulating formula petroleum hydrocarbon class pollutant identification method and device |
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