CN101285765A - Multi-grating programmable full color spectrometer and monitoring method facing to foodstuff safety monitoring - Google Patents
Multi-grating programmable full color spectrometer and monitoring method facing to foodstuff safety monitoring Download PDFInfo
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- CN101285765A CN101285765A CNA2008100697621A CN200810069762A CN101285765A CN 101285765 A CN101285765 A CN 101285765A CN A2008100697621 A CNA2008100697621 A CN A2008100697621A CN 200810069762 A CN200810069762 A CN 200810069762A CN 101285765 A CN101285765 A CN 101285765A
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Abstract
The invention relates to a multi-grating programmable panchromatic spectrometer aiming at monitoring the safety of foodstuff, comprising a light source, a sample pool, a detection part, dispersing components, an imaging device, a programmable spatial light modulator area array and a plurality of detectors aiming at different wavebands, wherein, light emitted by the light source passes through the sample pool and is reflected to the dispersing components; the light with different wavelengths is reflected to the programmable spatial light modulator area array by various dispersing components with different parameters; the programmable spatial light modulator area array is modulated through exertion of slaving voltage, and then a plurality of subsequently arranged single detectors respectively obtain the optical intensity of various wavelengths or the synthetic optical intensity of light with a plurality of wavelengths in turn according to the time sequence; finally, monitoring of spectra is realized by utilization of the digital conversion method. The dispersing components of the instrument adopt gratings or commercial compact discs and so on; the programmable spatial light modulator area array is a spatial light modulator area array based on MOMES technology; photoelectric detecting parts are a plurality of detectors aiming at different wavebands. The multi-grating programmable panchromatic spectrometer has the advantages of low cost, small volume, quick response speed, portable use, capability of realizing full spectrum detection and so on.
Description
Technical field
The present invention relates to the instrument analysis technology field, specifically, the present invention relates to a kind of multi-grating programmable full color spectrum monitoring system towards food safety monitoring, this instrument can be widely used in fields such as food safety monitoring, environmental monitoring, water quality monitoring, air monitoring.
Background technology
Food-safety problem becomes increasingly conspicuous in recent years, and food security more and more causes social concerns.Food safety monitoring becomes great science and technology, society, economic headache.Present Food Monitoring instrument is generally expensive, and volume is big, monitor consuming time, can not be on-the-spot to the food classification and sorting, become the restriction monitoring technology to the universal main bottleneck in food source.For this reason, carry out the cheapness that can be widely used in vast food source, small-sized, food safety monitoring method and apparatus research easily and efficiently is present research focus, have epoch urgency, strategic, great scientific meaning, distinctive technical advantage and very huge market outlook are arranged.Therefore, with the food safety monitoring technology is the breach, to establish and improve the food safety monitoring system that meets less developed country's national conditions is main target, explore a kind of cheapness, new principle small-sized, food safe monitoring instrument device easily and efficiently and new technology, for in China and other less developed countries from source popularization and application food safe monitoring instrument, residual harmful substance is established the theory and technology basis in the control food.And then develop the food safety monitoring method and apparatus that has independent intellectual property right, and to improving product competitiveness, satisfying the people's healthy needs, the food security image of lifting China etc. has important practical significance.
At present at the most of spectrometric instrument that adopts of the instrument of food safety monitoring.Spectrometric instrument is the important component part of optical instrument.It is the applied optics principle, and structure and the basic equipment that becomes to grade and measure, analyze and handle to material are widely used in fields such as chemical analysis, agricultural production, environmental monitoring, clinical examination, industrial detection and Aero-Space remote sensing.Existing spectrometer mainly comprises optical filter type, raster scan type, Fourier blade profile, acousto-optic tunable etc., but all has relative merits separately:
Optical filter type spectrometer: simple in structure, cost is low, and luminous flux is big, and is sturdy and durable.But very flexible, resolution are very low, and detected object is single, only are suitable for special purposes.
The raster scan type spectrometer: its rotation of passing through grating makes monochromatic light enter detecting device by sample successively by the wavelength height and detects.This light splitting technology is full-fledged, is widely used.But also exist sweep velocity slow, the wavelength poor reproducibility, inner moving-member is many, is difficult to the shortcoming of on-line monitoring and microminaturization.
The Fourier transform spectrometer: can measure, write down the signal of all wavelengths simultaneously, luminous flux is big, and resolution and signal to noise ratio (S/N ratio) height are with the obvious advantage aspect weak radiation detection.But because the existence of index glass in the interferometer, the online permanent reliability of instrument is restricted, in addition to the using and place environment strict requirement is also arranged of instrument, and cost an arm and a leg, bulky, only limit to the laboratory at present and use.
The acousto-optic tunable spectrometer: be to utilize ultrasound wave and specific crystal effect and produce the tunable technology of beam split, the wavelength control of its sequencing makes its application more flexible, but going of its existence a little is that resolution is relatively low, the price height.
Also have non-scanning fixed light path multichannel near-infrared spectroscopy device, its dispersion system adopts plane grating or holographic grating, no movable part, and speed is fast, is suitable as scene or online analytical instrument and uses.The near infrared from detecting array that its shortcoming is to use is extremely expensive, belongs to high-grade detecting instrument, and user scope is little, is difficult to popularize.
At present, along with the development of MEMS technology, spectroanalysis instrument to microminiaturized, speed fast, low-cost, high precision development is the road of certainty, and is and very urgent.Utilizing MEMS fabrication techniques micro spectrometer is the emphasis and the focus of food safe monitoring instrument device.
External representative is: 1. the people such as Ronald E.Stafford of TIX propose to use the imaging spectrometer of DMA (Digital Mirror Array) as the spectrum synthin, and it has reduced instrument cost, has improved detection speed; But it adopts three-decker, and the processing technology complexity causes yield rate low, costs an arm and a leg.2. U.S. Polychromix company, the people such as professor StephenSenturia of Honeywell research laboratory, Sandia National Labs and company of Massachusetts Institute of Technology (MIT) associating scientific research group have released the formula digital conversion spectrometer able to programme based on diffraction grating light beam principle, can survey wavelength coverage from 0.9um to 2.5um, dependable performance, compact conformation, inside does not have movable part, has eliminated that parts move and the error that may bring.It is truly to have developed into in-situs tester from the laboratory detecting instrument in the near infrared spectrum monitoring technical field, and successful Application has arrived and carries out real time on-line monitoring on the dairy process line at present.But its grating light valve that uses three-decker is as the optical channel switch, and the optical diffraction zone is little, at the bottom of the efficiency of light energy utilization, and the technological requirement height, domestic very difficult processing costs an arm and a leg, and is subjected to foreign patent protection and technical monopoly simultaneously.3. a kind of raster spectrometer based on the MEMS technology that German people such as F.Zimmer propose, polychromatic light incides on the rotatable grating, by modulated grating, makes the diffraction light of different wave length incide single InGaAs detector.Can survey scope 0.9um～2um.But, used the mechanical scanning structure in this grating spectrograph, simultaneously employed diffraction grating processed complex.In addition, German Hamburg-Harburg university, Switzerland Neuchatel university, Stanford Univ USA, Finland scholar Martti Blomberg etc. have carried out the research of spectrometer aspect.
Domesticly representative be: the infrared spectrum instrument and the integrated micro near infrared spectrometer based on micro mirror of people such as the Wen Zhiyu of University Of Chongqing exploitation.This miniature near infrared spectrometer adopts the MEMS scanning micro-mirror, uses integrated technology, and the instrument volume reduces greatly, is the miniature near infrared spectrometer that domestic scientific research institution develops the earliest.But, carrying out the research of multi-electrode driven sweep micro mirror near infrared spectrometer at present because domestic technology is difficult to effectively solve the coupling of scanning mirror area (going into luminous energy) and these two key parameters of driving voltage.People such as Wen Zhiyu has also developed the miniature near infrared spectrometer based on linear array detector spare in addition.But owing to use expensive infrared InGaAs to survey linear array, instrument cost is relatively more expensive.In addition, University Of Tianjin, Chinese Academy of Sciences's Changchun precision optical machinery and physics Institute, Fudan University etc. have all carried out the research of spectral instrument, Hua Zhong Agriculture University, Research Institute of Petro-Chemical Engineering etc. have carried out the food safety monitoring research based on spectral analysis, and have obtained certain achievement.
Summed up, there is following problem in these above spectrum monitoring methods:
(1) except filter plate type spectrometer, all can only carry out few sample fixed point and make a random inspection or the laboratory use, and the expense costliness; And the detected object of filter plate type is too single, has caused the weak present situation of China's food safety monitoring dynamics.
(2) external instrument costs an arm and a leg, and technology monopolizes by patent, is unfavorable for that penetration and promotion uses.
(3) linear array detector of near infrared spectrum costs an arm and a leg, and is difficult to cut down the cost of a whole set of monitoring system.
(4) as the Primary Component in the spectrometric instrument---diffraction grating/modulator, this type of device that above-mentioned spectrometric instrument is used, it is complicated to adopt MEMS technology to make, difficult quality guarantee.
In view of the shortcoming more than the present food safety monitoring method, China belongs to large agricultural country in addition, and farmland area is wide, and the plantation point disperses, seriously polluted, characteristics such as control surface is narrow, and monitoring instrument quantity is few, and scrutiny program is loaded down with trivial details, has only the popularity rate that improves monitoring instrument, carry out quality from the source of food and check on, could fundamentally improve the Food Monitoring dynamics of China, uplift the people's living standard and the export abroad economic benefit.
Summary of the invention
The objective of the invention is to lack the needs of fast monitored means and equipment, a kind of cheap, monitoring velocity is fast, volume is little, in light weight, easy to use multi-grating programmable full color spectrum monitoring method and the spectrometer that provide towards food safety monitoring at present China food security field.
Technical scheme of the present invention is as follows:
A kind of multi-grating programmable full color spectrometer towards food safety monitoring, comprise light source, sample cell, probe portion, dispersion element, imaging device, spatial light modulator planar array able to programme or spatially separate by the light of the different dispersion element of each parameter with different wave length, the light of the wavelength of all kinds that the space separates incides spatial light modulator planar array able to programme or linear array amalgamation again, by applying driving voltage spatial light modulator planar array able to programme or linear array amalgamation are modulated, make the single detector of a plurality of separation of follow-up setting obtain the light intensity of various wavelength or the synthetic light intensity of several wavelength light respectively in chronological order successively, utilize the monitoring of analog/digital conversion method realization at last spectrum.
Or linear array amalgamation and a plurality of single detectors that separate that are used for different-waveband.Described sample cell is arranged between light source and the dispersion element, the light that light source sends, through sample cell, pass through probe portion, incide on the dispersion element, spatial light modulator planar array able to programme or linear array amalgamation (being the amalgamation of a plurality of spatial light modulator linear array) are set on the optical diffraction circuit of dispersion element, corresponding respectively corresponding dispersion element, and between dispersion element and spatial light modulator planar array able to programme or linear array amalgamation, imaging device is set, by applying driving voltage spatial light modulator planar array able to programme or linear array amalgamation are modulated, several separation single detectors that are used for different-waveband are set in the imaging device focal plane again, to survey the spectral information of different-waveband, single detector obtains the light intensity of various wavelength or the synthetic light intensity of several wavelength light in chronological order successively, utilizes the monitoring of analog/digital conversion method realization to sample spectra again.
The multi-grating programmable full color spectrum monitoring method towards food safety monitoring that the present invention proposes is the light that light source is sent, the sample cell of testing sample is housed by the probe portion process earlier, make again on its dispersion element that incides a plurality of different angles, spatially separate by the light of the different dispersion element of each parameter different wave length, the light of the wavelength of all kinds that the space separates incides spatial light modulator planar array able to programme or linear array amalgamation again, by applying driving voltage spatial light modulator planar array able to programme or linear array amalgamation are modulated, make the single detector of a plurality of separation of follow-up setting obtain the light intensity of various wavelength or the synthetic light intensity of several wavelength light respectively in chronological order successively, utilize the monitoring of analog/digital conversion method realization at last spectrum.
Light source of the present invention can be selected combined deuterium-halogen tungsten lamp light source of having in the market, is applicable to ultraviolet/visible/near infrared application, and emission spectrum is from 200～2000nm, can various easily optical fiber and pop one's head in and be connected.Wherein at ultraviolet band, can select existing deuterium lamp on the market, it can produce the output spectrum of powerful, stable 215-400nm; At visible and infrared band, can select halogen tungsten lamp as light source.
Detector of the present invention can select respectively the GaP detector (150～550nm), InGaAs (700～1800nm) detectors, Si detector (200～1100nm) etc.
Dispersion element of the present invention adopts various gratings, as blazed grating, phase grating, also can adopt commercial CDs such as VCD or DVD, can avoid mechanical driving device like this, and low price is realized the full spectral region that a plurality of spectral region constitute are carried out high-resolution analysis.Adopt a plurality of dispersion elements, it is grating (wherein every kind of grating can be selected and design according to diffraction band) form arranged side by side, the diffraction light of the different wave length of each grating is encoded by spatial light modulator array respectively, the track pitch of CD, DVD is respectively 1.6um, 0.74um, can regard the grating that the cycle is respectively above-mentioned value as.
With the CD is example, and common grating equation is satisfied in its chromatic dispersion, promptly
d(sini±sinθ)＝mλ (1)
Wherein i is an incident angle, and θ is an angle of diffraction, and m is the order of diffraction time, and λ is the wavelength of incident light wave, and (+) number expression diffraction light and incident light be in the same side of grating normal, (-) each side at normal of number representing them.
Same level is inferior, and the angle of diffraction difference of different wave length correspondence for example, for m order diffraction light, can get according to grating equation
d(sini±sinθ
k-1)＝mλ
k-1 (2)
d(sini±sinθ
k)＝mλ
k (3)
Δλ
k＝λ
k-λ
k-1 (4)
K grating can be pressed k wavelength zone along arranging perpendicular to the plane of incidence, adjust the direction of each grating, make it corresponding with each wavelength zone, each grating has identical diffraction subtended angle scope in the plane of incidence, promptly
Δθ
1(Δλ
1)＝Δθ
2(Δλ
2)＝......＝Δθ
k(Δλ
k) (5)
Δ θ
kBe wavelength X
kWith λ
K-1The angle of diffraction that produces poor.
Incident light on the direction vertical with the plane of incidence, can form k the end to end wavelength zone of wavelength through k grating, just can cover λ
1To λ
kFull wavelength zone.This k the monochromatic optical wave with identical angle of diffraction through lens, is imaged on spectral information based on the MEMS spatial light modulator array.Adopt this method, can avoid mechanical driving device, realize the full spectral region that k (Δ λ) constitutes are carried out high-resolution analysis.
The spatial light modulator planar array able to programme that the present invention adopts is the spatial light modulator array (referring to Chinese patent ZL200510020186.8) based on Micro-Opto-Electro-Mechanical Systems (MOMES) technology, and the photodetection part also only is several detectors at different-waveband.The optical transfer function that the MOEMS spatial light modulator array is realized can be utilized the digital conversion function, as the Hadamard conversion etc., uses matrix form, raising property make an uproar than and the efficiency of light energy utilization.The Hadamard conversion is actually the application of weighing design in optics in the statistics.Adopt N Hadamard conversion template that sample signal is modulated, can obtain the signal of N modulation, detect the value of each modulation signal, then can be reduced into the modulation signal that records for N time the signal of sample after N the measurement by demodulation matrix with detecting device.In routine measurement, detecting device only detects the signal intensity of a resolution element in each time interval, and Hadamard conversion multi-channel detection technology can detect the total intensity of composite signal in a plurality of resolution elements at one time simultaneously.
Hadamard conversion principle is as the formula (1):
X
J=1...NFor flashlight behind the CD optical grating diffraction, incide on the spatial light modulator light intensity of j optical channel after the modulated device discrete sampling.
Y
J=1...NFor flashlight behind spatial light modulator coding, become in chronological order the multichannel light that j order incide on the single near infrared detector and synthesize light intensity.
A
Ij (i=1...N, j=1...N)Be i discrete sampling optical channel on the spatial modulator, j present optical modulation state of the moment.When i j of optical channel constantly was ON state, the light of this passage of process can reach detector smoothly, is encoded to " 1 ", i.e. A
Ij=1.When i j of optical channel constantly was OFF state, the light of this passage of process was diffracted into other positions by spatial light modulator, and zero order light can not arrive detector smoothly, is encoded to " 0 ", i.e. A
Ij=0.
According to Hadamard conversion principle, carry out the collection of N the synthetic light intensity of N passage according to certain rules, just can be by matrix operation X=A
-1Y obtains the light intensity that is reached each optical channel after the color separation of CD grating, just can obtain the near infrared spectrum of substances to be measured again by the optical grating diffraction equation.
Under same experimental conditions, adopt the Hadamard conversion to make the signal to noise ratio (S/N ratio) of system to improve
Doubly.Because the existence of various errors and the restriction of spatial light modulation device can not be accomplished absolute switch attitude.T is that spatial light modulator " is opened " under the attitude situation, incides the light intensity and the number percent that is incided this optical channel light intensity after the color separation of CD grating, T of detector through single optical channel single
0Under spatial light modulator " pass " attitude situation, incide the light intensity and the number percent that is incided this optical channel light intensity after the color separation of CD grating of detector through single optical channel single.
The present invention has following advantage:
The present invention utilizes various gratings, especially utilize commercial CD as dispersion element, and CD has very big dispersive power and very high resolution characteristic, use CD to constitute a plurality of gratings, the single detector that is equipped with a plurality of separation can be realized full spectrum detection, price is very cheap, is almost " zero cost ".
The present invention adopts the MOMES spatial light modulator, and cost is low, and response speed is fast, and switch efficiency is higher, can produce in batches.The present invention adopts analog/digital conversion method, carries out the detection method of the synthetic light intensity of hyperchannel in chronological order, only needs single detector just can realize spectrographic detection, and low price has greatly reduced the cost of total system.
The present invention adopts digital conversion (Hadamard conversion), has increased luminous flux, can improve the efficiency of light energy utilization, the raising property ratio of making an uproar, and also decoding is simple, and operand is little, and measuring speed is fast, and control circuit is simple, is easy to integrated.
The present invention utilizes reflection and transmission principle to carry out sample signal photodetection sampling, can carry out nontransparent material and transparency material and survey.
Therefore total system have cheap, volume is little, response speed is exceedingly fast, low in energy consumption, portable use, precision be than advantages such as height, can be widely used in fields such as food safety monitoring, environmental monitoring, water quality monitoring, air monitoring.
Description of drawings
Fig. 1: the structure principle chart that is used for the multi-grating programmable full color spectrometer of food safety monitoring;
Figure 1A is the schematic layout pattern for the single detector 7 of a plurality of separation.
Fig. 2: the structure principle chart of two kinds of probes of probe portion, figure (a) is reflective probe; Figure (b) is the transmission-type probe;
Fig. 3: based on the structural representation of MEMS spatial light modulator;
Fig. 4: based on the partial structurtes synoptic diagram of MEMS spatial light modulator planar array;
Fig. 5: this instrument is each optical channel view of spatial light modulation device at a time
Wherein 1 is light source, and 2 is sample cell, and 3 is slit, and 4 is a plurality of dispersion elements (various gratings also can adopt commercial CD), and 5 is imaging len, and 6 is based on the MEMS spatial light modulator planar array, and 7 is the single detector of a plurality of separation, and 8 is sample to be monitored; 9 incident opticals; 10 outgoing optical fiber
61. silicon substrate, 62. oxides, 63. insulation courses, 64. negative electrodes, 65. bottom reflectings surface, 66. top layer reflectings surface, 67, semi-girder, 68. bias voltage applying device.
Embodiment
As shown in Figure 1, sample cell 2 is arranged between light source 1 and the dispersion element 4, and between sample cell 2 and dispersion element 4, slit 3 is set, MOMES spatial light modulator planar array 6 able to programme (also can adopt the linear array amalgamation) is set on the optical diffraction circuit of dispersion element 4, and between dispersion element 4 and MOMES spatial light modulator planar array 6 able to programme, imaging len 5 is set, by applying driving voltage MOMES spatial light modulator planar array 6 able to programme is modulated, be provided with again in the focal plane of imaging len 5 several pins to the single detector 7 of the separation of different-waveband (in conjunction with referring to Figure 1A, as required, by detector D
1, D
2... D
NForm, corresponding with a plurality of dispersion elements respectively).During work, the light that light source 1 sends, through sample cell 2, probe portion and slit 3, light beam irradiates is to the different dispersion element 4 of a plurality of angles, diffraction light is imaged on the MOMES spatial light modulator planar array 6 able to programme by imaging len 5, spatial light modulator array is modulated diffracted beam, the diffraction light of different-waveband is after modulation, single detector 7 by a plurality of separation is surveyed, single detector obtains the light intensity of various wavelength or the synthetic light intensity of several wavelength light in chronological order successively, utilize analog/digital conversion method to realize spectrum monitoring, the information of sample just is reflected in the spectrum, realizes food safety monitoring etc.
For probe portion, can adopt different probes that the sample information of carrying out to be monitored is obtained.Shown in (a) among Fig. 2, be reflective probe, promptly constitute by the homonymy that incident optical 9 and outgoing optical fiber 10 is arranged on sample cell 2, incident optical 9 carries light source information and shines on the interior sample to be monitored 8 of sample cell, reflection enters emergent light fibre 10 through the light behind the sample to be monitored, reaches on the dispersion element 4 of follow-up setting again.
If sample to be monitored is a light penetrating object, can directly the sample cell that sample 8 to be monitored is housed be placed between light source 1 and the slit 3, also can adopt the transmission-type probe shown in the figure (b), promptly constitute by incident optical 9 and outgoing optical fiber 10 being arranged on 2 liang of relative both sides of sample cell, incident optical 9 carries light source information and shines on the interior sample to be monitored 8 of sample cell, enter outgoing optical fiber 10 through the transmitted light behind the sample to be monitored, arrive again on the dispersion element 4 of follow-up setting.
Based on the MEMS spatial light modulator array as shown in Figure 3 and Figure 4, deposit growth one deck oxide 62 on silicon substrate 61, the insulation course of deposit etching again 63, negative electrode 64, plate bottom reflecting surface 65, by the deposit sacrifice layer, form top layer reflecting surface 66, the more needed grating of etching thereon, this grating is positive electrode, and last releasing sacrificial layer just can obtain structure as shown in Figure 3.As driving force, removable slit interconnects as top electrode by semi-girder 67 and inserts public ground the GMLM device with electrostatic force, and following catoptron is as bottom electrode, and bonding has the cmos circuit of similar DRAM to discharge and recharge in order to control below bottom electrode.The spacing of bottom reflecting surface 65 and top layer reflecting surface 66 can be regulated by bias voltage applying device 68.When making alive not, the optical path difference of reflecting surface is the even-multiple of incident light half-wavelength up and down, and at this moment GMLM is equivalent to a catoptron, and diffraction energy concentrates on 0 grade, and light is by being " opening " attitude; After adding certain voltage, removable slit is drop-down λ/4 distances under the effect of electrostatic attraction, the optical path difference of reflecting surface is the odd-multiple of the half-wavelength of incident light up and down, ideally about 81% diffraction energy concentrates on ± and 1 grade, and 0 grade of energy is almost 0, at this moment GMLM is the equal of a rectangle phase grating, and incident light is diffraction at a certain angle, and this moment, optical channel was " pass " attitude.
The digital conversion principle that is applied to the spatial light modulation device as shown in Figure 5, the on off state of a certain moment each pixel of spatial light modulation device.For the light of " opening " attitude pixel by being " opening " attitude, light can arrive on the detector smoothly through this passage, is encoded to " 1 ".For the light of " pass " attitude pixel by being " passs " attitude, light passes through this passage and can not arrive on the detector, is encoded to " 0 ".
Claims (6)
1, multi-grating programmable full color spectrum monitoring method towards food safety monitoring, it is characterized in that: the light that light source is sent, the sample cell of testing sample is housed by the probe portion process earlier, make again on its dispersion element that incides a plurality of different angles, spatially separate by the light of the different dispersion element of each parameter different wave length, the light of the wavelength of all kinds that the space separates incides spatial light modulator planar array able to programme or linear array amalgamation again, by applying driving voltage spatial light modulator planar array able to programme or linear array amalgamation are modulated, make the single detector of a plurality of separation of follow-up setting obtain the light intensity of various wavelength or the synthetic light intensity of several wavelength light respectively in chronological order successively, utilize the monitoring of analog/digital conversion method realization at last spectrum.
2, realize the multi-grating programmable full color spectrometer of the described monitoring method of claim 1, it is characterized in that: it comprises light source, sample cell, probe portion, a plurality of dispersion element, imaging device, spatial light modulator planar array able to programme or linear array amalgamation and a plurality of single detectors that separate that are used for different-waveband; Described sample cell is arranged between light source and the dispersion element, and the light that light source sends by probe portion, through sample cell, incides on the different dispersion elements of a plurality of angles, and described dispersion element is corresponding one by one with follow-up detector according to diffraction characteristic; Spatial light modulator planar array able to programme or linear array amalgamation are set on the optical diffraction circuit of dispersion element, and between dispersion element and spatial light modulator planar array able to programme or linear array amalgamation, imaging device is set, by applying driving voltage spatial light modulator planar array or array combination are modulated, a plurality of separation single detectors that are used for different-waveband are set in the imaging device focal plane again, detector obtains the light intensity of various wavelength or the synthetic light intensity of several wavelength light in chronological order successively, utilizes the monitoring of analog/digital conversion method realization to sample spectra again.
3, the multi-grating programmable full color spectrometer towards food safety monitoring according to claim 2 is characterized in that: described dispersion element is selected the commercial CD of a plurality of gratings, a plurality of VCD or DVD; Described imaging device adopts image-forming objective lens.
4, according to the multi-grating programmable full color spectrometer of claim 2 or 3 described food safety monitorings, it is characterized in that: described probe portion adopts reflective probe, promptly, incident optical and outgoing optical fiber constitutes by being arranged on the sample cell homonymy, incident optical carries light source information and shines on the interior sample to be monitored of sample cell, reflection enters the emergent light fibre through the light behind the sample to be monitored, reaches on the dispersion element of follow-up setting again.
5, according to claim 2 or 3 described multi-grating programmable full color spectrometers towards food safety monitoring, it is characterized in that: described probe portion adopts the transmission-type probe, promptly constitute by incident optical and outgoing optical fiber being arranged on sample cell two relative both sides, incident optical carries light source information and shines on the interior sample to be monitored of sample cell, enter outgoing optical fiber through the transmitted light behind the sample to be monitored, arrive again on the dispersion element of follow-up setting.
6, according to claim 2 or 3 described multi-grating programmable full color spectrometers towards food safety monitoring, it is characterized in that: described probe portion also can adopt form of slits, promptly between sample cell and dispersion element, slit is set, the sample to be monitored in the sample cell is crossed in the direct transmission of light source, by slit, arrive again on the dispersion element of follow-up setting.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275908B (en) * | 2008-03-10 | 2010-07-28 | 重庆大学 | Food safe monitoring instrument based on space light modulator |
| CN103018807A (en) * | 2011-09-20 | 2013-04-03 | 上海复享仪器设备有限公司 | Splicing method for preparing changeable blazed grating |
| CN103940509A (en) * | 2014-03-20 | 2014-07-23 | 南京大学 | Near-infrared spectrometer and measuring method thereof |
| CN114034642A (en) * | 2021-12-08 | 2022-02-11 | 重庆大学 | Raman spectrum on-chip detection system and method based on micro-ring resonant array |
-
2008
- 2008-05-29 CN CN2008100697621A patent/CN101285765B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275908B (en) * | 2008-03-10 | 2010-07-28 | 重庆大学 | Food safe monitoring instrument based on space light modulator |
| CN103018807A (en) * | 2011-09-20 | 2013-04-03 | 上海复享仪器设备有限公司 | Splicing method for preparing changeable blazed grating |
| CN103018807B (en) * | 2011-09-20 | 2016-06-01 | 上海复享光学股份有限公司 | A kind of joining method preparing variable balzed grating, |
| CN103940509A (en) * | 2014-03-20 | 2014-07-23 | 南京大学 | Near-infrared spectrometer and measuring method thereof |
| CN103940509B (en) * | 2014-03-20 | 2016-03-23 | 南京大学 | A kind of near infrared spectrometer and measuring method thereof |
| CN114034642A (en) * | 2021-12-08 | 2022-02-11 | 重庆大学 | Raman spectrum on-chip detection system and method based on micro-ring resonant array |
| CN114034642B (en) * | 2021-12-08 | 2023-10-24 | 重庆大学 | Raman spectrum on-chip detection system and method based on micro-ring resonance array |
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