CN202886274U - Micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer - Google Patents
Micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer Download PDFInfo
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- CN202886274U CN202886274U CN 201220466385 CN201220466385U CN202886274U CN 202886274 U CN202886274 U CN 202886274U CN 201220466385 CN201220466385 CN 201220466385 CN 201220466385 U CN201220466385 U CN 201220466385U CN 202886274 U CN202886274 U CN 202886274U
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Abstract
The utility model discloses a micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer, belonging to the technical field of near infrared non-destructive testing. The micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer comprises a light splitting device, an integrating sphere, a sample cup, a microprocessor and a keyboard input and result display device of a micro electro mechanical system, and a computer data processing unit. Light is split by adopting the advanced micro electro mechanical system, thus the miniaturization and microminiaturization of the near infrared spectrum analyzer are realized, and basic conditions are created for researching and developing the subsequent portable agricultural product quality near infrared fast detector; and because a material continuous near infrared diffuse reflection spectrum is detected, content indexes of multiple components of agricultural products can be very conveniently measured. According to the micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer, a light signal carrying sample information is collected by adopting an integrating sphere diffuse reflection mode and is transmitted to the microprocessor for being processed.
Description
Technical field
The utility model belongs to the near infrared technical field of nondestructive testing, relates to the quality of agricultural product near-infrared spectrometers of a kind of novel micro-electromechanical technology (MEMS).
Background technology
Near-infrared spectrum analysis is as a kind of analytical approach rapidly and efficiently, can carry out fast, accurately quantitatively or qualitative analysis the various samples such as comprising from gas to transparent or muddy liquid, from homogenate to the powder, from the solid material to the biological tissue.Near-infrared spectrum analysis (NIR) is one of high-new analytical technology with the fastest developing speed over past ten years, its amount of samples is few and do not destroy sample, need not sample is carried out chemical treatment, and can carry out simultaneously quantitative test to the Multiple components in the sample in the short time at 1 ~ 2 minute the utmost point, have cost low, speed is fast, and precision is high, pollution-free, be convenient in real time, the advantages such as on-line analysis and control.
The near infrared detection technology all obtains fine application in fields such as agricultural, petrochemical industry, pharmacy, food, and obtains fabulous society and economic benefit.Composition detection such as the check of the bread basket in the agricultural product, dairy produce; The half-finished on-line monitoring of stages in the detection of finished product and the preparation process in the pharmaceuticals industry.In drug abuse test, near-infrared spectral analysis technology has been the differentiation means of the medicine true and false of a large-scale popularization.Near-infrared spectral analysis technology the quality of Chinese herb differentiate and preparation in analysis of effective component aspect application is also arranged.China abounds in tea, and the online detection of studying fast tea grades and tea product process with near-infrared spectral analysis technology all has been reported.In recent years, near-infrared spectrum analysis is used widely in petrochemical field, and is applied to gradually online process analysis procedure analysis.
Traditional near-infrared spectrometers kind is a lot, can be divided into set wave elongated and sweep type, the set wave elongated is divided into again optical filter type and LED type, the light that optical filter type near-infrared spectrometers adopts some interference filters that light source is launched carries out light splitting, as required wavelength rotatable lamella wheel is selected a suitable optical filter light path during measurement, the instrument volume very much not is convenient for carrying, the monochromatic bands of a spectrum of this analyser are wider, the wavelength resolution rate variance, power consumption is large, efficient light power is little, and the life-span is short.Light emitting diode (LED) type near-infrared spectrometers is to adopt LED as light source, produce different wavelength with different light emitting diodes, the spectral half-width of such near-infrared analyzer is excessive to be reached more than the 30nm, do not satisfy the selection requirement for accurate specific wavelength, still can adopt LED to add the mode of optical filter on some instrument in addition, the too small situation of effective luminous power be can occur equally, measuring accuracy and accuracy affected.Sweep type is divided into again grating type, Fourier-type, acousto-optic turnable filter type (AOTF type) and multi-channel type.What the grating type near-infrared analyzer adopted is grating beam splitting, so the restriction of slit makes its resolution and sensitivity lower, and strict to light path, and extraneous light intensity can affect test result, and sweep velocity is slow.The Fourier-type near-infrared analyzer can shake and deflection in scanning process because of with moving-member, causes the unstable of interference signal, and sensitivity descends.Acousto-optic turnable filter type (AOTF type) near-infrared analyzer uses the arrangement realization of alternating electric field control crystal to the light splitting of complex light, and the bands of a spectrum of light splitting are wider, and resolution is lower, and natural veiling glare can be influential.The principle of multi-channel type near-infrared analyzer is: the light that light source sends focuses on the fixed grating through behind the sample, and the light after the holographic grating dispersion is detected simultaneously by multichannel detector.Its shortcoming is that dynamic range is limited, and to responsive to temperature.
Based on the quality of agricultural product near-infrared spectrometers of micro-electromechanical system (MEMS) technology owing to adopting MEMS dynamic scan micro mirror technology and unit InGaAs detector technology, bulky, optical texture is complicated, cost is high shortcoming when overcoming existing near infrared spectrometer and adopting the light splitting technology such as optical filter type, raster scan type, Fourier transform type, array detection type and acousto-optic tunable type have realized the microminiaturization of spectrometer; External small-sized near infrared spectrometer price is about 400,000 yuan, middle-grade product is about 1,500,000 yuan, the quality of agricultural product near-infrared spectrometers based on the micro-electromechanical system (MEMS) technology of these research and development has been realized production domesticization, have the very high ratio of performance to price and good competitive power, its price only has the sixth of import instrument.The small sized product price is about 50,000 yuan, and middle-grade product is about 150,000 yuan.
Summary of the invention
In order to overcome the existing limitation of traditional near-infrared spectrometers, provide a kind of quality of agricultural product near-infrared spectrometers based on the micro-electromechanical system (MEMS) technology.
Based on the quality of agricultural product near-infrared spectrometers of micro-electromechanical system (MEMS) technology, this instrument comprises light-splitting device, integrating sphere, sample cup, microprocessor, keyboard input and the device displaying result of MEMS (micro electro mechanical system), computer data processing unit; Described MEMS (micro electro mechanical system) light-splitting device is connected with integrating sphere by optical fiber, enters MEMS (micro electro mechanical system) near-infrared spectrometers through behind the Multi reflection by optical fiber at the integrating sphere inwall after the near infrared light that light source sends and material to be measured interact; Described integrating sphere comprises incident light hole, detector mouth and the sample cup entrance that is integrated on the integrating sphere wall, and sample cup is connected with integrating sphere by the sample cup entrance; The keyboard input places on the shell of instrument with device displaying result, links to each other with microprocessor; The computer data processing unit links to each other with microprocessor by USB interface; Entering the change in optical signal of being measured by near infrared photodetector after the micro mirror light splitting of light through the microsystem electric control of MEMS (micro electro mechanical system) light-splitting device links to each other with microprocessor by pre-amplification circuit.
Wherein said MEMS (micro electro mechanical system) light-splitting device, it comprises the joints of optical fibre, optical fiber collimator, scanning reflection micro mirror, blazed grating, focusing mirror, slit and detector; Optical signals joints of optical fibre access light path to be measured, optical fiber collimator is positioned at the rear portion of the joints of optical fibre, light signal via the joints of optical fibre and optical fiber collimator after, forming collimated light incides on the scanning reflection micro mirror, scanning reflection micro mirror reflected light signal is to blazed grating, blazed grating resolves into the incident polychromatic light in the monochromatic light of different wave length, monochromatic light incides on the focus lamp catoptron, by the focus lamp catoptron assemble and reflection by slit to detector, detector is positioned over the convergence direction of focusing mirror, the monochromatic intensity that detector measurement receives; The minute surface of scanning reflection micro mirror is made periodic wobble, so that incident angle and the outgoing monochromatic locus of incident polychromatic light on blazed grating is cyclical variation, after the convergence of focus lamp catoptron, enter successively in the detector by slit, realize the scanning of full spectrum.
The sample cup entrance of wherein said integrating sphere has to make sample cup fixing groove and register pin; Light enters integrating sphere by incident light hole, and sample cup is inserted integrating sphere by the sample cup entrance, and the rotary sample cup is fixed its position until register pin enters flange circle groove.Irradiation is in the bottom of sample cup, diffusing after material absorbs constantly reflected at the integrating sphere inwall, light behind integrating sphere inside surface Multi reflection enters in the spectrometer of MEMS (micro electro mechanical system) and carries out light splitting, and the near infrared detector in MEMS (micro electro mechanical system) is transformed into electric signal with light signal and passes to microprocessor simultaneously.
Wherein said sample cup adopts low-hydroxy-group squartz glass to make, shape adopts cylindrical, the lower end adds the end, and adopts the flange circle to fix sample cup to contact with integrating sphere, on the flange circle fluted for detection of the time register pin on the integrating sphere is inserted in order to locate more accurately; Sample cup vertically is placed on the integrating sphere by integrating sphere sample chamber entrance, realizes sample to the Surface absorption of near infrared light, sample chamber specification and the measurement model parameter of the corresponding different-diameter of design feature per sample.
Adopt the quality of agricultural product near-infrared spectrometers based on the micro-electromechanical system (MEMS) technology provided by the utility model, owing to having adopted advanced MEMS (micro electro mechanical system) to carry out light splitting, miniaturization and the microminiaturization of near infrared spectroscopy instrument have not only been realized, created outside the pacing items for researching and developing follow-up portable quality of agricultural product near infrared rapid detection apparatus, be the continuous near-infrared diffuse reflection spectrum of material because of what detect also, thereby can detect the Multiple components content's index of weighing quality of agricultural product easily.The utility model adopts integrating sphere diffuse reflection mode that microprocessor is collected and passed to the light signal that carries sample message and processes.
Description of drawings
Fig. 1 is the structural drawing of MEMS (micro electro mechanical system) provided by the utility model (MEMS) near-infrared analyzer;
Fig. 2 is the beam-splitting structure figure of MEMS (micro electro mechanical system) provided by the utility model (MEMS) near-infrared analyzer;
Fig. 3 is integrating sphere diagrammatic cross-section provided by the utility model and sample cup structural representation;
Fig. 4 is sample cup structural representation provided by the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the composition structural representation of MEMS (micro electro mechanical system) provided by the utility model (MEMS) near-infrared spectrometers, this instrument comprises MEMS (micro electro mechanical system) light-splitting device 14, integrating sphere 20, sample cup 30, microprocessor 50, keyboard input and device displaying result 60, computer data processing unit 70; Described MEMS (micro electro mechanical system) light-splitting device 14 is connected with integrating sphere 20 by optical fiber 13, and the light of MEMS (micro electro mechanical system) light-splitting device 14 enters integrating sphere 20 by optical fiber 13; Described integrating sphere 20 comprises incident light hole 21, detector mouth 25 and the sample cup entrance 22 that is integrated on the integrating sphere wall, and sample cup 30 is connected with integrating sphere 20 by sample cup entrance 22; The keyboard input places on the shell 90 of instrument with device displaying result 60, links to each other with microprocessor 50.Computer data processing unit 70 links to each other with microprocessor 50 by USB interface 71; Establish detector 40 on the detector mouth 25 on the excircle of integrating sphere 20, the change in optical signal that detector is measured links to each other with microprocessor by pre-amplification circuit.
Fig. 2 is the index path of the MEMS (micro electro mechanical system) light-splitting device 14 of the quality of agricultural product near-infrared spectrometers based on micro-electromechanical system (MEMS) (Micro-Electro-Mechanical Systems) technology provided by the utility model, as shown in Figure 2, it comprises the joints of optical fibre 1, optical fiber collimator 2, scanning reflection micro mirror 3, blazed grating 4, focusing mirror 5, slit 6 and detector 7; The optical signals joints of optical fibre 1 access light path to be measured, optical fiber collimator 2 is positioned at the rear portion of the joints of optical fibre 1, light signal via the joints of optical fibre 1 and optical fiber collimator 2 after, forming collimated light incides on the scanning reflection micro mirror 3, scanning reflection micro mirror 3 reflected light signals are to blazed grating 4, blazed grating 4 resolves into the incident polychromatic light in the monochromatic light of different wave length, monochromatic light incides on the focus lamp catoptron 5, pass through slit 6 to detector 7 by 5 convergences of focus lamp catoptron and reflection, detector 7 is positioned over the convergence direction of focusing mirror 5, and detector 5 is measured the monochromatic intensity that receives; The minute surface of scanning reflection micro mirror 3 is made periodic wobble, so that incident angle and the outgoing monochromatic locus of incident polychromatic light on blazed grating 4 is cyclical variation, after 5 convergences of focus lamp catoptron, enter successively in the detector 7 by slit, realize the scanning of full spectrum.
Described integrating sphere comprises forming incidence hole 10, the sample cup entrance 22 that is integrated in integrating sphere base 26 and the interface that is connected MEMS spectrometer optical fiber 25 as shown in Figure 3, and sample cup entrance 22 has to make sample cup fixing groove 23 and register pin 24; Light enters integrating sphere 20 by incidence hole 10, and sample cup 30 is inserted integrating sphere 20 by sample cup entrance 22, and rotary sample cup 30 is fixed its position until register pin 24 enters flange circle 31 grooves 32.After on the material of irradiation in sample cup 30, diffuse reflection near infrared light after material absorbs is constantly reflecting at integrating sphere 20 inwalls so that the light intensity of integrating sphere 20 inside surfaces reaches consistent, connect MEMS spectrometer optical fiber 25 in put into spectrometer incident optical 13 light signal that carries sample message be input to MEMS (micro electro mechanical system) light-splitting device 14 and carry out light splitting, convert electric signal to and pass to microprocessor 50 by the signal of the detector 7 in the spectrometer with the monochromatic light Strength Changes.
As shown in Figure 4, described sample cup 30 adopts low-hydroxy-group squartz glass to make, shape adopts cylindrical, the lower end adds the end, and adopt flange circle 31 to fix the degree of depth of inserting integrating sphere, on the flange circle 31 fluted 32 for detection of the time register pin 24 on the integrating sphere 20 is inserted so that more accurate location; Sample cup 30 is vertically put into integrating sphere 20 inside by integrating sphere sample chamber entrance 22, realizes that sample absorbs the body of near infrared light, sample chamber specification and the measurement model parameter of the corresponding different-diameter of design feature per sample.
Described light transmitting fiber 13 be used for to receive the diffuse transmission spectral signal of the material of surveying that all is distributed in the integrating sphere inwall, and these near infrared light signals that carry sample message are sent in the MEMS (micro electro mechanical system) light-splitting device 14 changes electric signal into.
50 pairs of electric signal that receive of described microprocessor are processed, comprising: MEMS (micro electro mechanical system) (MEMS) control module, A/D modular converter, computing module, memory module and display module.
The analog signal conversion that described A/D modular converter is used for detector 40 outputs is digital signal, to data analysis, processing, computing.Under the A/D modular converter can adopt A/D converter, its formation and to be connected to those skilled in the art known.
The data that described memory module stores data processor and storage produce when carrying out this program are so described storer comprises the zone of the data that memory processes program and storage produce when carrying out this program.
Described computing module can be set up instance model according to the sample of measuring in advance, and according to this instance model the sample that will measure is predicted.
Show in described keyboard input and the display module of result in microprocessor 50, the keyboard input is used for the pattern that detects is selected, and luminous power is regulated, and data processing mode is selected.Display is used for the demonstration to result.Be used for the processing to data, and set up model, by USB interface 71, the model of setting up is passed in the respective memory of microprocessor 50, after being convenient to it is directly called.
Described MEMS (micro electro mechanical system) (MEMS) near-infrared spectrometers also comprises shell 90, attaching plug 85, switch 80, USB interface 71, is used for controlling whole instrument, as shown in Figure 1.
The test operation of sample is as follows:
1. plug in 85, turn on the power switch 80, the parameter of installing each annex is arranged.As the intensity of light source, dark current detection, background detection etc. are set.
2. the sample cup 30 of testing sample being packed into, sample size is inserted in the integrating sphere 20 by sample cup entrance 22 for there not to be flange circle 31.The light that light source sends shines the testing sample surface through entrance pupil 10, and integrating sphere 20 interior continuous reflections, sample fully absorbs light in the sample cup, light transmitting fiber 40 light that will carry sample message is input in the near infrared spectroscopy instrument of MEMS (micro electro mechanical system) (MEMS) and converts electric signal to subsequently, and pass in the microprocessor 50, through the A/D conversion equipment analog signal conversion is become digital signal, and choose the model of having set up test volume is calculated, a certain quality index values of this material of calculating is shown with device displaying result by the keyboard input.
3. the sample after will testing takes out, and the cleaning sample cup is done next time test and prepared.
Below by example the utility model is done and to be specified.
The utility model can be measured the component content of many kinds of substance, lifts one at this and is used for the embodiment that the sesame moisture detects, and the detection of other samples can be with reference to the detection method of this embodiment.
Get some parts of the sesame (about 100 parts) of different in moisture, a part is as calibration set (about 70 parts), and remainder is as forecast set (about 30 parts).National standard and industry standard GB8304-87 according to existing sesame quality check measure the water cut of all samples as measured value; With MEMS (micro electro mechanical system) (MEMS) near-infrared spectrometers it is carried out spectra collection, the absorption spectrum signal value that detecting device is obtained is kept in the microprocessor 50.Then by usb communication interface 71 with data importing in the computer data processing unit, set up the correlation model between spectral signal value and the sesame water cut.The model parameter that obtains is written in microprocessor 50 respective storage areas of spectrometer by usb communication interface 71.
Next just can carry out Fast Measurement to the sesame of unknown moisture.The line 85 that plugs in turns on the power switch 80, and selecting detecting pattern by the keyboard input with display module is the sesame water content detection; With sesame to be measured sample cup 30 is filled to and did not have the flange circle, add a cover, inserted to rotate to register pin 24 by sample cup entrance 22 and place in the flange circle groove 32, begin to detect; Program according to prior setting, light source sends enters integrating sphere 20, wall and sample surfaces constantly reflect within it, and sample fully absorbs light in the sample cup 30, and diffuse reflection light is out collected and is input in the near infrared spectrometer of MEMS (micro electro mechanical system) (MEMS) by light transmitting fiber 40; The near infrared light signal that detecting device will carry sample message changes electric signal into, changes in the digital signal input microprocessor 50 by A/D again; Microprocessor is accepted this spectral signal value and spectral signal value substitution model is calculated, the keyboard input with can show this sesame water cut on the display module as a result, so far the sesame water cut detects and finishes.
Above-mentioned near infrared detection method can realize the modeling of instrument, after model is set up, realizes fast detecting and the demonstration of the index of quality.
This example only is an embodiment of the present utility model.Obviously, the utility model is not limited only to this, and many distortion can also be arranged, and all distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection domain of the present utility model.
Claims (4)
1. based on the quality of agricultural product near-infrared spectrometers of micro-electromechanical technology, it is characterized in that comprising light-splitting device, integrating sphere, sample cup, microprocessor, keyboard input and the device displaying result of MEMS (micro electro mechanical system), the computer data processing unit; Described MEMS (micro electro mechanical system) light-splitting device is connected with integrating sphere by optical fiber, enters MEMS (micro electro mechanical system) near-infrared spectrometers through behind the Multi reflection by optical fiber at the integrating sphere inwall after the near infrared light that light source sends and material to be measured interact; Described integrating sphere comprises incident light hole, detector mouth and the sample cup entrance that is integrated on the integrating sphere wall, and sample cup is connected with integrating sphere by the sample cup entrance; The keyboard input places on the shell of instrument with device displaying result, links to each other with microprocessor; The computer data processing unit links to each other with microprocessor by USB interface; Entering the change in optical signal of being measured by near infrared photodetector after the micro mirror light splitting of light through the microsystem electric control of MEMS (micro electro mechanical system) light-splitting device links to each other with microprocessor by pre-amplification circuit.
2. the quality of agricultural product near-infrared spectrometers based on micro-electromechanical technology according to claim 1, it is characterized in that wherein said MEMS (micro electro mechanical system) light-splitting device, comprise the joints of optical fibre, optical fiber collimator, scanning reflection micro mirror, blazed grating, focusing mirror, slit and detector; Optical signals joints of optical fibre access light path to be measured, optical fiber collimator is positioned at the rear portion of the joints of optical fibre, light signal via the joints of optical fibre and optical fiber collimator after, forming collimated light incides on the scanning reflection micro mirror, scanning reflection micro mirror reflected light signal is to blazed grating, blazed grating resolves into the incident polychromatic light in the monochromatic light of different wave length, monochromatic light incides on the focus lamp catoptron, by the focus lamp catoptron assemble and reflection by slit to detector, detector is positioned over the convergence direction of focusing mirror, the monochromatic intensity that detector measurement receives; The minute surface of scanning reflection micro mirror is made periodic wobble, so that incident angle and the outgoing monochromatic locus of incident polychromatic light on blazed grating is cyclical variation, after the convergence of focus lamp catoptron, enter successively in the detector by slit, realize the scanning of full spectrum.
3. the quality of agricultural product near-infrared spectrometers based on micro-electromechanical technology according to claim 1, the sample cup entrance that it is characterized in that wherein said integrating sphere have the groove and the register pin that make sample cup fixing; Light enters integrating sphere by incident light hole, sample cup is inserted integrating sphere by the sample cup entrance, and the rotary sample cup is until register pin enters flange circle groove, its position is fixed, irradiation is in the bottom of sample cup, diffusing after material absorbs constantly reflected at the integrating sphere inwall, light behind integrating sphere inside surface Multi reflection enters in the spectrometer of MEMS (micro electro mechanical system) and carries out light splitting, and the near infrared detector in MEMS (micro electro mechanical system) is transformed into electric signal with light signal and passes to microprocessor simultaneously.
4. the quality of agricultural product near-infrared spectrometers based on micro-electromechanical technology according to claim 1, it is characterized in that wherein said sample cup adopts low-hydroxy-group squartz glass to make, shape adopts cylindrical, the lower end adds the end, and adopt the flange circle to fix sample cup to contact with integrating sphere, on the flange circle fluted for detection of the time register pin on the integrating sphere is inserted in order to locate more accurately; Sample cup vertically is placed on the integrating sphere by integrating sphere sample chamber entrance, realizes sample to the Surface absorption of near infrared light, sample chamber specification and the measurement model parameter of the corresponding different-diameter of design feature per sample.
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| CN 201220466385 CN202886274U (en) | 2012-09-14 | 2012-09-14 | Micro electro mechanical system technology-based agricultural product quality near infrared spectrum analyzer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890070A (en) * | 2012-09-14 | 2013-01-23 | 江苏惠通集团有限责任公司 | Near infrared spectrum analyzer for quality of agricultural product based on micro electro-mechanical technology |
| CN103940766A (en) * | 2014-05-06 | 2014-07-23 | 浙江大学 | Device for detecting optical properties of agricultural product texture |
| CN105158204A (en) * | 2015-09-28 | 2015-12-16 | 浙江大学 | Adjustable light source device for visible near infrared spectrum detection of internal quality of fruits |
| CN106918577A (en) * | 2017-03-02 | 2017-07-04 | 许昌学院 | The detection means and method of a kind of medicine |
| CN107167448A (en) * | 2017-07-13 | 2017-09-15 | 燕山大学 | A kind of small-sized near infrared spectrometer optical system based on compound parabolic concentrator |
| TWI685660B (en) * | 2018-09-20 | 2020-02-21 | 大陸商信泰光學（深圳）有限公司 | Optical detecting apparatus |
-
2012
- 2012-09-14 CN CN 201220466385 patent/CN202886274U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890070A (en) * | 2012-09-14 | 2013-01-23 | 江苏惠通集团有限责任公司 | Near infrared spectrum analyzer for quality of agricultural product based on micro electro-mechanical technology |
| CN103940766A (en) * | 2014-05-06 | 2014-07-23 | 浙江大学 | Device for detecting optical properties of agricultural product texture |
| CN105158204A (en) * | 2015-09-28 | 2015-12-16 | 浙江大学 | Adjustable light source device for visible near infrared spectrum detection of internal quality of fruits |
| CN106918577A (en) * | 2017-03-02 | 2017-07-04 | 许昌学院 | The detection means and method of a kind of medicine |
| CN107167448A (en) * | 2017-07-13 | 2017-09-15 | 燕山大学 | A kind of small-sized near infrared spectrometer optical system based on compound parabolic concentrator |
| CN107167448B (en) * | 2017-07-13 | 2023-05-05 | 燕山大学 | Optical system of small near infrared spectrometer based on compound parabolic condenser |
| TWI685660B (en) * | 2018-09-20 | 2020-02-21 | 大陸商信泰光學（深圳）有限公司 | Optical detecting apparatus |
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