CN103528984A - Optical grating type near infrared analyzer - Google Patents
Optical grating type near infrared analyzer Download PDFInfo
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- CN103528984A CN103528984A CN201310498403.9A CN201310498403A CN103528984A CN 103528984 A CN103528984 A CN 103528984A CN 201310498403 A CN201310498403 A CN 201310498403A CN 103528984 A CN103528984 A CN 103528984A
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Abstract
The invention provides an optical grating type near infrared analyzer, relating to the field of grain and food solid sample component and content analysis and aiming to solve the problem that the spectral intensity data can not be accurately acquired when the traditional near infrared analyzer is used for detecting a powdery sample. The optical grating type near infrared analyzer comprises an upper computer, a controller, a light source, a motor, an amplifier, an A/D (Analog-to-Digital) converter, a sample disk, a converging lens, a first collecting lens, a second collecting lens and a monochromator, wherein the light source, the motor, the amplifier and the A/D converter are connected with the controller; the sample disk is connected with the motor; the converging lens is used for receiving rays from the light source and aligning the rays to form parallel light to be incident to the sample disk; the first collecting lens and the second collecting lens are used for receiving rays reflected by the sample disk and converging the rays to enter an optical fiber group; the monochromator is electrically connected with the amplifier and is used for receiving the rays from the optical fiber group; the amplifier is electrically connected with the A/D converter. The optical grating type near infrared analyzer is mainly used for measuring components of powdery grains, a halogen lamp is high in lighting intensity and stable in energy, the rays are conducted through an optical fiber to obtain the maximum lossless and fidelity input, the relatively abundant spectral information is extracted, and false operation is effectively avoided through the real-time monitoring of the controller.
Description
Technical field
The present invention relates to grain, foods solid sample composition and content analysis technical field, be specifically related to a kind of raster pattern near-infrared analyzer.
Background technology
When measuring grain component and content, conventionally adopt simple physical method or comparatively complicated chemical detection method, chemical detection method Measuring Time is long, and waste time and energy, physical method need to destroy sample, easily cause environmental pollution, for making up this defect, many detecting instruments have in succession been developed both at home and abroad, as far infrared, in infrared, near-infrared spectrometer etc., by the vibrational spectrum that under monitoring Infrared irradiation, sample particles produces, Analysis deterrmination grain component and content, have and do not destroy sample, without reagent, free from environmental pollution, the features such as convenient operation, now be widely used in food inspection field.
Because powder matter sample is solid compared to the arrangement of graininess sample, transmitance is very low, and the weak electric signal that existing near-infrared analyzer is detected is not enough to the intensity that reaches analyzed, therefore, cannot obtain spectral intensity data accurately.
Summary of the invention
For what solve that existing near-infrared analyzer exists when powder matter sample is detected, cannot obtain the problem of spectral intensity data accurately, the invention provides a kind of raster pattern near-infrared analyzer.
The present invention is that the technical scheme that adopts of technical solution problem is as follows:
Raster pattern near-infrared analyzer, comprising:
Host computer, the controller being electrically connected to host computer, the light source being electrically connected to controller respectively, motor, amplifier and A/D converter, the sample disc being electrically connected to motor, be arranged between light source and sample disc and for receiving the light of light source and being collimated into directional light, be incident to the plus lens in sample disc, for receiving the light reflecting through sample disc and being converged the first condenser and the second condenser lens that enters optical fiber group, that be connected with amplifier electric and for receiving the monochromator of the light of optical fiber group, described amplifier is electrically connected to A/D converter;
Described host computer sends light source open command to controller, controller is opened light source by the light source open command receiving, the light of light source converts directional light to and is radiated in sample disc after plus lens converges, light occurs after diffuse reflection between sample disc and the first condenser and second condenser lens, the first condenser and second condenser lens converge to the light that carries abundant sample information in optical fiber group, through the harmless high-fidelity of optical fiber group, conduct in monochromator, light is converted to weak electric signal and imports in amplifier after monochromator is processed, amplifier receives weak electric signal and it is carried out importing in A/D converter after operation amplifier, A/D converter is converted to digital signal transfers to controller by simulating signal, by host computer, read spectroscopic data, utilize the spectral manipulation analysis software in host computer to carry out analyzing and processing to receiving spectroscopic data, realize the quantitative test of sample.
Described monochromator comprises cavity; Be arranged on inside cavity for the light that carries sample message being collimated into the first catoptron of directional light, for receiving directional light and it being carried out to the grating of light splitting, for converging the second catoptron by each band of light after grating beam splitting, for surveying the detector that converges photoimaging;
The optical fiber being positioned in the first reflector focal point that is arranged on cavity outside enters perforation, the USB interface being directly fixedly linked with detector;
The light that carries sample message is entered by optical fiber after fiber optic conduction that perforation high-fidelity is harmless to be incident on the first catoptron in cavity, light is collimated into directional light through the first catoptron and is incident on grating, directional light is converted to irradiation under different wave length on the second catoptron after grating beam splitting, the second catoptron converges to the spectroscopic data under above-mentioned each wavelength on detector, and detector is converted to weak electric signal by the spectroscopic data receiving and is directly derived by USB interface.
Described detector adopts silicon detector.
Described grating adopts the plane grating of Changchun Sai Ao Science and Technology Development Co., Ltd., is of a size of 15mm * 15mm * 4mm, every millimeter of 300 lines.
The spectral wavelength scope of described grating is 900nm～1665nm, at interval of 3nm, gets a spectral value, obtains altogether 256 spectral values.
Described light source adopts Halogen lamp LED.
Described amplifier adopts AD8250 chip.
Described A/D converter adopts LTC1609 chip.
Described motor adopts 35BYGH28-0504 stepper motor.
Described controller adopts STM32F103ZET6 chip, the steering order that controller receives host computer to spectroscopic data gather, to when measuring.
The invention has the beneficial effects as follows:
1, the present invention measures mainly for powder matter grain composition, adopts Halogen lamp LED to throw light on, and illumination intensity is large, energy stabilization;
2, in the present invention, light obtains maximum harmless fidelity input via fiber optic conduction, light is reasonable step office's catoptron and mounting for grating after properties and calculation of parameter, extract useful spectral band and be refined as 256 wave bands as far as possible, wavelength band is 900nm～1665nm, at interval of 3nm, get a spectral value, extract abundant as far as possible spectral information, carry out signal amplification and subsequent treatment;
3, the present invention passes through controller Real-Time Monitoring, and receives the steering order of host computer, has effectively avoided misoperation problem;
4, analyser of the present invention is a high-accuracy analytical instrument of intellectuality, can simultaneous quantitative qualitative analysis Multiple components, transmission depth is large, can be by features such as glass or the medium such as quartzy are difficult for being absorbed, especially cereal grain and oil etc. are related to the key industry of the people's livelihood provides solid reliable detection support.
Accompanying drawing explanation
Fig. 1 is the structural representation of raster pattern near-infrared analyzer of the present invention;
Fig. 2 is the structural representation of monochromator.
In figure: 1, cavity, 2, optical fiber enters perforation, the 3, first catoptron, 4, grating, the 5, second catoptron, 6, detector, 7, USB interface.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, raster pattern near-infrared analyzer of the present invention, by light source, plus lens, the first condenser, second condenser lens, sample disc, motor, optical fiber group, monochromator, amplifier and A/D converter, controller and host computer form, host computer is connected by cable with controller, controller respectively with light source, motor, amplifier is connected by cable with A/D converter, motor is connected by cable with sample disc, monochromator is connected by cable with amplifier, amplifier is connected by cable with A/D converter, plus lens is placed between light source and sample disc, for receiving the light of light source and being collimated into directional light, be incident to sample disc, the first condenser and second condenser lens enter optical fiber group for receiving the light reflecting through sample disc and being converged, monochromator arranges near optical fiber group, for receiving the light from optical fiber group.
As shown in Figure 2, monochromator is by cavity 1, optical fiber enters perforation 2, the first catoptron 3, grating 4, the second catoptron 5, detector 6 and USB interface 7 form, the first catoptron 3, grating 4, the second catoptron 5 and detector 6 are all fixedly installed on cavity 1 inside, optical fiber enters perforation 2 and USB interface 7 is all fixedly installed on cavity 1 outside, optical fiber enters in the focus that perforation 2 is positioned at the first catoptron 3, the first catoptron 3 is for being collimated into directional light by the light that carries sample message, grating 4 is for receiving directional light and it being carried out to light splitting, the second catoptron 5 is for converging by the light under each wavelength after grating 4 light splitting, detector 6 is for receiving spectrum data and be converted into weak electric signal, detector 6 is directly fixedly connected with USB interface 7, USB interface 7 is connected with amplifier.
In present embodiment, detector 6 adopts silicon detectors, the feature such as have low price, volume is little, signal to noise ratio (S/N ratio) is high and heat affecting is little.
In present embodiment, according to the needs of actual measurement and by calculating, each optical device is carried out to type selecting, grating 4 adopts the plane grating of Changchun Sai Ao Science and Technology Development Co., Ltd., is of a size of 15mm * 15mm * 4mm, every millimeter of 300 lines (300/mm).
Utilize grating 4 to read respectively the spectral intensity data under different wave length by the coherence stack of light, grating 4 mainly plays the effect that wavelength is selected, by grating, average for 16 times, each wave band full scan once draws 256 final spectral informations afterwards, spectral wavelength scope is 900nm～1665nm, at interval of 3nm, get a spectral value, altogether obtain 256 spectral values, lex primaria and the integrality of spectral information have fully been ensured, and by grating 4 light splitting, reduced greatly the impact of parasitic light, promote the accuracy of Testing of Feeble Signals, make spectral intensity data there is good stability and accuracy.
In present embodiment, light source adopts Halogen lamp LED.
In present embodiment, amplifier adopts AD8250 chip, has the features such as high speed, gain-variable and low noise.
In present embodiment, A/D converter adopts LTC1609 chip.
In present embodiment, motor adopts 35BYGH28-0504 stepper motor, has Stability Analysis of Structures, moves the features such as accurate.
In present embodiment, controller is a kind of miniature mini system computer control module, be microcontroller chip, specifically adopt STM32F103ZET6 chip, the action control of the collection of spectroscopic data, contrast, measurement and analyser is all realized by PC control controller.
The course of work of raster pattern near-infrared analyzer of the present invention is as follows:
Host computer sends light source open command to controller, controller is opened light source according to the light source open command receiving, the light that halogen light source is sent is radiated in sample disc through converting directional light to after the converging of plus lens, light occurs after diffuse reflection between sample disc and the first condenser and second condenser lens, the first condenser and second condenser lens converge to the light that carries abundant sample information in optical fiber group, through the harmless high-fidelity of optical fiber group, conduct in monochromator, the light that carries sample message is entered by optical fiber after fiber optic conduction that perforation 2 high-fidelities are harmless to be incident in the cavity 1 of light path system, the light that carries sample message enters perforation 2 by optical fiber and is incident on the first catoptron 3, the first catoptron 3 is collimated into directional light by light and is incident on grating 4, directional light is converted to irradiation under different wave length on the second catoptron 5 after grating 4 light splitting, spectral wavelength scope is 900nm～1665nm, at interval of 3nm, get a spectroscopic data, obtain altogether 256 spectroscopic datas, the second catoptron 5 by the light under above-mentioned each wavelength namely 256 spectroscopic datas converge on detector 6, detector 6 is converted to weak electric signal by the spectroscopic data receiving and is directly derived by USB interface 7, amplifier receives weak electric signal and it is carried out importing in A/D converter after operation amplifier, A/D converter is converted to digital signal transfers to controller by simulating signal, by host computer, read spectroscopic data, utilize the spectral manipulation analysis software in host computer to carry out analyzing and processing to receiving spectroscopic data, realize the quantitative test of sample.
Raster pattern near-infrared analyzer of the present invention is in the process of measuring, host computer sends the order of starter motor to controller, controller is according to the steering order starter motor receiving, now, the uniform rotation of driven by motor sample disc, make spectral absorption difference that the sample in sample disc produces because grain size, shape and distribution are different by repeatedly measuring and eliminate, obtain measurement result more accurately, in whole measuring process, motor accurately operation under the information of controller is transmitted in real time and regulated and controled.
Raster pattern near-infrared analyzer of the present invention is in the process of measuring, to specific sample system, the difference of near infrared spectrum characteristic peak is also not obvious, need to by the processing of spectrum, reduce to eliminate the interference of each side factor to spectral information, then from the very micro-spectral information of difference, extract the quantitative information of sample.
Claims (10)
1. raster pattern near-infrared analyzer, is characterized in that, comprising:
Host computer, the controller being electrically connected to host computer, the light source being electrically connected to controller respectively, motor, amplifier and A/D converter, the sample disc being electrically connected to motor, be arranged between light source and sample disc and for receiving the light of light source and being collimated into directional light, be incident to the plus lens in sample disc, for receiving the light reflecting through sample disc and being converged the first condenser and the second condenser lens that enters optical fiber group, that be connected with amplifier electric and for receiving the monochromator of the light of optical fiber group, described amplifier is electrically connected to A/D converter;
Described host computer sends light source open command to controller, controller is opened light source by the light source open command receiving, the light of light source converts directional light to and is radiated in sample disc after plus lens converges, light occurs after diffuse reflection between sample disc and the first condenser and second condenser lens, the first condenser and second condenser lens converge to the light that carries abundant sample information in optical fiber group, through the harmless high-fidelity of optical fiber group, conduct in monochromator, light is converted to weak electric signal and imports in amplifier after monochromator is processed, amplifier receives weak electric signal and it is carried out importing in A/D converter after operation amplifier, A/D converter is converted to digital signal transfers to controller by simulating signal, by host computer, read spectroscopic data, utilize the spectral manipulation analysis software in host computer to carry out analyzing and processing to receiving spectroscopic data, realize the quantitative test of sample.
2. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described monochromator comprises: cavity (1);
Be arranged on cavity (1) inner for the light that carries sample message being collimated into first catoptron (3) of directional light, for receiving directional light and it being carried out to the grating (4) of light splitting, be used for converging the second catoptron (5) by each band of light after grating (4) light splitting, for surveying, converge the detector (6) of photoimaging;
Be arranged on the outside optical fiber being positioned in the first catoptron (3) focus of cavity (1) and enter perforation (2), the USB interface (7) being directly fixedly linked with detector (6);
The light that carries sample message is entered by optical fiber after fiber optic conduction that perforation (2) high-fidelity is harmless to be incident on the first catoptron (3) in cavity (1), light is collimated into directional light through the first catoptron (3) and is incident on grating (4), directional light is converted to irradiation under different wave length on the second catoptron (5) after grating (4) light splitting, it is upper that the second catoptron (5) converges to detector (6) by the spectroscopic data under above-mentioned each wavelength, and detector (6) is converted to weak electric signal by the spectroscopic data receiving and is directly derived by USB interface (7).
3. raster pattern near-infrared analyzer according to claim 2, is characterized in that, described detector (6) adopts silicon detector.
4. raster pattern near-infrared analyzer according to claim 2, is characterized in that, described grating (4) adopts the plane grating of Changchun Sai Ao Science and Technology Development Co., Ltd., is of a size of 15mm * 15mm * 4mm, every millimeter of 300 lines.
5. according to the raster pattern near-infrared analyzer described in claim 2 or 4, it is characterized in that, the spectral wavelength scope of described grating (4) is 900nm～1665nm, at interval of 3nm, gets a spectral value, obtains altogether 256 spectral values.
6. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described light source adopts Halogen lamp LED.
7. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described amplifier adopts AD8250 chip.
8. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described A/D converter adopts LTC1609 chip.
9. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described motor adopts 35BYGH28-0504 stepper motor.
10. raster pattern near-infrared analyzer according to claim 1, is characterized in that, described controller adopts STM32F103ZET6 chip, the steering order that controller receives host computer to spectroscopic data gather, to when measuring.
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| CN201310498403.9A CN103528984A (en) | 2013-10-22 | 2013-10-22 | Optical grating type near infrared analyzer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104374734A (en) * | 2014-09-30 | 2015-02-25 | 中国电子科技集团公司第四十一研究所 | PC104 bus-based high-performance near-infrared spectroscopy analysis device and method |
| CN104614340A (en) * | 2015-01-30 | 2015-05-13 | 长春长光思博光谱技术有限公司 | Cloud platform-based optical grating near-infrared detector |
| CN108195789A (en) * | 2017-12-05 | 2018-06-22 | 广州讯动网络科技有限公司 | A kind of hand-held device of quick detection grain index, method |
| CN108204955A (en) * | 2018-01-30 | 2018-06-26 | 黑龙江大学 | A kind of transmission-type multiband near-infrared liquid component intellectual analysis device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104374734A (en) * | 2014-09-30 | 2015-02-25 | 中国电子科技集团公司第四十一研究所 | PC104 bus-based high-performance near-infrared spectroscopy analysis device and method |
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| CN108204955A (en) * | 2018-01-30 | 2018-06-26 | 黑龙江大学 | A kind of transmission-type multiband near-infrared liquid component intellectual analysis device |
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Application publication date: 20140122 |