CN103353438A

CN103353438A - Near-infrared grain composition analysis instrument

Info

Publication number: CN103353438A
Application number: CN2013103263979A
Authority: CN
Inventors: 朴仁官; 林新光
Original assignee: CHANGCHUN CHANGGUANG SIPO SPECTRUM TECHNOLOGY Co Ltd
Current assignee: CHANGCHUN CHANGGUANG SIPO SPECTRUM TECHNOLOGY Co Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2013-10-16

Abstract

A near-infrared grain composition analysis instrument belongs to the field of grain product composition and content analysis, solves the problems that the measurement result of a conventional Japanese taste value detector is unreliable and affects the grain composition analysis, and comprises a sample chamber, a near-infrared optical system, a transmission light collection system, a host system, and a control module, wherein an optical filter disc manufactured by adopting aluminium alloy is electrically connected with a first stepping motor, a second stepping motor and a third stepping motor are electrically connected with a valve and a rolling wheel respectively; the control module receives commands of the host system to control the first stepping motor to drive the optical filter disc to rotate and arrange optical-filtering wavelength, control the second stepping motor to open and close the valve for blanking, and control the third stepping motor to drive the rolling wheel to rotate for discharging; the sample is subjected to transmission by near-infrared lights; the transmission light collection system receives and processes spectrum weak signals; the control module transports spectrum data to the host system and utilizes a spectrum process and analysis software to conduct analysis and process. The spectrum data measured by the instrument is stable and accurate, so as to effectively avoid a misoperation.

Description

Near infrared grain component analyser

Technical field

The present invention relates to bread basket composition and content analysis technical field, be specifically related to a kind of near infrared grain component analyser.

Background technology

When measuring grain component and content, usually 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 remedying this defective, in succession developed many detecting instruments both at home and abroad, such as far infrared, in infrared, near-infrared spectrometer etc., by the vibrational spectrum that sample particles under the monitoring Infrared irradiation produces, Analysis deterrmination grain component and content have and do not destroy sample, without reagent, free from environmental pollution, the characteristics such as convenient operation now have been widely used in the food inspection field.With the immediate existing checkout equipment of the present invention be Japan the food flavor value detector, the optical filter dish in this detector is plastic material, and is yielding, and easily affected by vibration, has a strong impact on the stability of Output rusults; During sample detection, the cutting mode of this detector is magnet control, and power is large, and heat is high, easily causes sample chamber and the rising of detection means temperature on every side, has a strong impact on the stability of device performance and testing result.

Summary of the invention

Thereby the unreliable problem that affects the grain component analysis of measurement result that exists in order to solve existing Japanese food flavor value detector the invention provides a kind of near infrared grain component analyser.

The present invention is that the technical scheme that adopts of technical solution problem is as follows:

Near infrared grain component analyser, comprise: the sample chamber is installed in valve and the roller of sample chamber upper and lower side, the near infrared light path system and the transmitted light collection system that arrange near sample chamber front window and rear hatch respectively, master system, the control module that is electrically connected with master system; Described transmitted light collection system is electrically connected with control module;

Also comprise: the first stepper motor that is electrically connected with optical filter dish that the employing aluminium alloy in the described near infrared light path system is made, the second stepper motor that is electrically connected with valve and roller respectively and the 3rd stepper motor;

Described the first stepper motor, the second stepper motor and the 3rd stepper motor all are electrically connected with control module, described control module receives the master system instruction and controls the first stepping driven by motor optical filter disc spins and its filter wavelength is set, control the second stepper motor opening and closing valve and carry out blanking, control the rotation of the 3rd stepper motor drive roller and carry out discharging;

Near infrared light in the described near infrared light path system enters the sample chamber by the sample chamber front window sample is carried out transmission, the transmitted light collection system is delivered to control module after processing by sample chamber rear hatch receiving spectrum weak signal and to it, control module is delivered to the spectroscopic data that collects in the master system, utilizes the spectral manipulation analysis software in the master system that spectroscopic data is carried out analyzing and processing.

Described near infrared light path system also comprises: light source, collimation lens, coloured glass, plus lens and frosted glass, the light of described light source successively through collimation lens collimation, coloured glass filter, plus lens converges adjustments, enter the sample chamber by the sample chamber front window after the filtering of optical filter dish, frosted glass adjustment intensity.

Described light source adopts Halogen lamp LED, and light source is electrically connected with control module, and control module receives the switch of master system instruction control light source and the light intensity magnitude of light source is regulated.

Described transmitted light collection system comprises: near detector, the third stage amplifier that is electrically connected with detector of sample chamber rear hatch setting and the A/D converter that is electrically connected with third stage amplifier; Described A/D converter is electrically connected with control module, described detector receives near infrared light to carry out carrying the spectrum weak signal of sample message and the spectrum weak signal being converted to electric signal after the transmission to sample, third stage amplifier carries out importing A/D converter into behind the operation amplifier to electric signal, and A/D converter is to import it into control module after the digital signal with analog signal conversion.

Described detector is silicon detector.

Described third stage amplifier adopts AD820 chip, AD526 chip and the coupling of AD526 chip that the spectrum weak signal is carried out the three-stage operational amplification.

Described coloured glass is cutoff filter, is used for eliminating two auroral spectrums of near infrared light path system.

Described optical filter dish adopts filter type to divide optical mode, carries out the selection of specific wavelength behind the filtration visible light again, and complex light is converted to monochromatic light.

Also comprise the loading hopper that is arranged on described valve upper end and the funnel that goes out that is arranged on described roller lower end.

Described control module is microcontroller chip.

Inventive principle: near infrared spectrum belongs to frequency multiplication and the dominant frequency absorption spectrum of molecular vibration spectrum, mainly be because the anharmonicity of molecular vibration produces when making molecular vibration from ground state to the high level transition, what near infrared spectrum recorded is frequency multiplication and the sum of fundamental frequencies information of the fundamental vibration of single chemical bond in the molecule, it usually is subjected to hydric group X-H(XC, N, O) frequency multiplication and sum of fundamental frequencies overlapping leading, in near infrared spectral range, measurement mainly be that frequency multiplication and the sum of fundamental frequencies of hydric group X-H vibration absorbs.

The invention has the beneficial effects as follows:

1, the optical filter dish among the present invention adopts aluminum alloy materials to process, and compares with the optical filter dish of existing plastic material, has stronger shock resistance, and it is not yielding, Stability Analysis of Structures is difficult for affected by vibrationly, makes the spectroscopic data that finally records more stable and precisely;

2, the present invention is when detecting sample, cutting mode and the discharge method selected are stepper motor, namely realize blanking by the second stepping motor control valve door, realize discharging by the 3rd step motor control roller, these two stepper motors of real-time signal control that control module receives master system rotate, compare with the mode of existing magnet control valve folding, the heat of the generation in the circuit of the present invention is lower, thereby having avoided large electric current to produce heat makes the internal temperature rising of instrument affect the problems such as device performance and measurement result stability, realized real-time communication between each device of system and the accurate control of blanking and discharging, the performance of detection means and testing result are comparatively stable on every side;

3, the present invention passes through the control module Real-Time Monitoring, and receives the steering order of master system, the misoperation problem of effectively having avoided the electromagnet device to bring;

4, near infrared grain component analyser of the present invention is a high-accuracy analytical instrument of intellectuality, but simultaneous quantitative qualitative analysis Multiple components, transmission depth is large, can be by characteristics such as glass or the medium such as quartzy are difficult for being absorbed, especially cereal grain and oil etc. are concerned that the key industry of the people's livelihood provides solid reliable detection support.

Description of drawings

Fig. 1 is the structural representation of near infrared grain component analyser of the present invention;

Fig. 2 is the aqueous dispersion point schematic diagram in the calibration sample among the embodiment 1;

Fig. 3 is the loose point of the protein in calibration sample schematic diagram among the embodiment 1;

Fig. 4 is the loose point of the wet gluten in calibration sample schematic diagram among the embodiment 1;

Fig. 5 is the aqueous dispersion point schematic diagram in the calibration sample among the embodiment 2;

Fig. 6 is the loose point of the protein in calibration sample schematic diagram among the embodiment 2;

Fig. 7 is the loose point of the wet gluten in calibration sample schematic diagram among the embodiment 2.

Among the figure: 1, light source, 2, collimation lens, 3, coloured glass, 4, plus lens, 5, optical filter dish, the 6, first stepper motor, 7, frosted glass, 8, sample chamber, the 9, second stepper motor, 10, valve, 11, loading hopper, 12, roller, 13, go out funnel, 14, the 3rd stepper motor, 15, detector, 16, third stage amplifier, 17, A/D converter, 18, control module, 19, master system.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

As shown in Figure 1, near infrared grain component analyser of the present invention, comprise light path system, sample turnover system, the transmitted light collection system, control module 18 and master system 19, control module 18 is electrically connected with master system 19, control module 18 receives the steering order of master system 19, light path system is by light source 1, collimation lens 2, coloured glass 3, plus lens 4, optical filter dish 5, the first stepper motor 6 and frosted glass 7 form, light source 1 adopts Halogen lamp LED, light source 1 is electrically connected with control module 18, the steering order of control module 18 reception master systems 19 is controlled the opening and closing of light source 1 and the light intensity magnitude of light source 1 is regulated, the first stepper motor 6 is electrically connected with optical filter dish 5 and control module 18 respectively, the steering order that control module 18 receives master system 19 is controlled the first stepper motor 6 and is rotated, control module 18 can be adjusted according to the live signal of master system 19 rotating manner of the first stepper motor 6, and drives 5 rotations of optical filter dishes and the filter wavelength of optical filter dish 5 is accurately arranged by controlling the first stepper motor 6; The light that light source 1 sends is through forming parallel input path behind the collimation of collimation lens 2, directional light is incident on the coloured glass 3, coloured glass 3 is used for eliminating two auroral spectrums of light path system as cutoff filter, directional light is incident on the plus lens 4 through after the filtration of coloured glass 3, through plus lens 4 converge adjustment after be incident on the optical filter dish 5, converge light and be converted near infrared light after the filtering of mating plate dish 5 after filtration and be incident on the frosted glass 7, near infrared light enters sample chamber 8 through the front window by sample chamber 8 after the intensity adjustment of frosted glass 7.

Optical filter dish 5 in the present embodiment adopts filter type to divide optical mode, 11 optical filters are arranged on the optical filter dish 5, wavelength is respectively 825nm, 850nm, 875nm, 900nm, 925nm, 950nm, 975nm, 1000nm, 1025nm, 1050nm, 1075nm, light just only has the light of these 11 wavelength to pass through after the mating plate dish 5 after filtration, all being filtered of its commplementary wave length, after filtering most of visible light, optical filter dish 5 carries out again the selection of specific wavelength, finish complex light is converted into monochromatic process, do like this spectrum that not only can not affect near infrared range, but also can reduce as much as possible the impact of parasitic light, making the incident light that enters sample chamber 8 have good stability, is the core component of near infrared grain component analyser of the present invention.

Optical filter dish 5 in the present embodiment adopts aluminum alloy materials to make, compare with the optical filter dish of plastic material and to have stronger shock resistance, and it is not yielding, make the spectroscopic data that finally records more stable and accurate, and it has the characteristics such as simple in structure, that spectral energy is strong, and the accuracy of the Testing of Feeble Signals of being easy to is more arranged.

Sample turnover system is by sample chamber 8, the second stepper motor 9, valve 10, loading hopper 11, roller 12, go out funnel 13 and the 3rd stepper motor 14 compositions, the upper end of sample chamber 8 is equipped with valve 10, the lower end is equipped with roller 12, valve 10 upper ends are provided with loading hopper 11, roller 12 lower ends are provided with out funnel 13, valve 10 is electrically connected with the second stepper motor 9, roller 12 is electrically connected with the 3rd stepper motor 14, the second stepper motor 9 and the 3rd stepper motor 14 all are electrically connected with control module 18, the steering order that control module 18 receives master system 19 is controlled the second stepper motor 9 and is rotated, control module 18 can be adjusted according to the live signal of master system 19 rotating manner of the second stepper motor 9, and by control the second stepper motor 9 real-time accurately on off states of by-pass valve controls 10, the each sample discharge quantity that detects of on off state control by by-pass valve control 10, the steering order that control module 18 receives master system 19 is controlled the 3rd stepper motor 14 and is rotated, control module 18 can be adjusted according to the live signal of master system 19 rotating manner of the 3rd stepper motor 14, and by controlling the rotation of the 3rd stepper motor 14 control rollers 12, the sample in the sample chamber 8 is expelled to out in the funnel 13 through the rotation with roller 12 behind the transmission of near infra red light.

The transmitted light collection system is by detector 15, third stage amplifier 16 and A/D converter 17 form, detector 15 is arranged on the rear hatch position near sample chamber 8, effectively avoid other parasitic light on the impact of result of detection, detector 15 is electrically connected with third stage amplifier 16, third stage amplifier 16 is electrically connected with A/D converter 17, A/D converter 17 is electrically connected with control module 18, detector 15 receives near infrared lights comprehensively and sample is carried out the spectrum weak signal of carrying sample message after the transmission, detector 15 changes the spectrum weak signal that receives into electric signal, electric signal imports in the A/D converter 17 through behind the operation amplifier of third stage amplifier 16, after A/D converter 17 is digital signal with analog signal conversion, control module 18 gathers digital signal and is sent in the master system 19, utilize the spectral manipulation analysis software in the master system 19 that the spectroscopic data that receives is carried out analyzing and processing, realize quantitative test.

Detector 15 in the present embodiment adopts silicon detector, has the characteristics such as low price, volume is little, signal to noise ratio (S/N ratio) is high, heat affecting is little.

Third stage amplifier 16 in the present embodiment adopts three grades of structure for amplifying, namely adopt respectively the form of AD820 chip, AD526 chip and the coupling of AD526 chip that the spectrum weak signal is carried out the three-stage operational amplification, significantly promote signal amplification factor, improve the signal recognition degree.

A/D converter 17 in the present embodiment adopts the LTC1609 chip, has the characteristics such as wide dynamic range, signal to noise ratio (S/N ratio) is high, figure place is wide.

Control module 18 in the present embodiment is microcontroller chip, specifically adopts the STM32F103ZET6 chip.

Store calibration parameter in the master system 19 in the present embodiment is analyzed the spectroscopic data after the analyzing and processing and calibration parameter, obtains and show the measurement result of final grain component analysis.

For specific sample system, the difference of near infrared spectrum characteristic peak is also not obvious, needs to pass through the processing minimizing of spectrum and eliminate the each side factor to the interference of spectral information, extracts the quantitative information of sample from the very little spectral information of difference again.

Near infrared grain component analyser of the present invention is in carrying out the grain component testing process, calculate mean value after every batch sample is measured respectively three times and carry out again next step analyzing and processing, active balance when sample distribution uneven, the difference of outgoing spectroscopic data obtains more accurately measurement result under the objective condition such as grain size and shape change.

Embodiment 1

Get 55 parts of wheat samples, wherein 44 parts as calibration sample, all the other 11 parts as verification sample, this two duplicate samples has contained the various component content spans that may occur, and in the whole content range of composition, evenly distribute, utilize stechiometry to record the precise chemical structure value of 44 parts of each component contents of wheat calibration sample, as shown in table 1, each the composition stoichiometric number that obtains, the result who is used for measuring with near infrared grain component analyser of the present invention compares.

Table 1

Start near infrared grain component analyser of the present invention, 44 parts of wheat calibration samples are measured condition near infrared grain component analyser of the present invention respectively: room temperature, the instant measurement, spectral range is 825nm～1075nm, and resulting 11 groups of spectral values are shown in table 2 and table 3.

Table 2

Sample number into spectrum	Spectral value 1	Spectral value 2	Spectral value 3	Spectral value 4	Spectral value 5
						52	3.0881838	2.9402714	2.8208476	2.8341513	2.8487165
54	3.1716266	3.0207325	2.8964968	2.9032176	2.9094824
						55	2.8739045	2.7363471	2.6242899	2.6321691	2.6397399
57	2.8958068	2.7652449	2.6601389	2.6710507	2.6811109
						58	2.9517889	2.8059473	2.6830247	2.6772480	2.6692071
62	3.1267844	2.9820933	2.8679898	2.8892350	2.9127562
						75	3.2312863	3.0515034	2.8993916	2.8926474	2.8842994
77	2.8510248	2.7164162	2.6097359	2.6264128	2.6447748
						80	2.8130300	2.6663888	2.5474040	2.5569911	2.5663347
84	3.1706810	3.0111066	2.8769986	2.8682472	2.8565653
						85	3.2509805	3.0950585	2.9635133	2.9553940	2.9428466
90	2.9749840	2.8500643	2.7573685	2.7916780	2.8229735
						92	2.7436798	2.5929317	2.4713508	2.4827620	2.4925463
94	2.8950276	2.7735091	2.6854401	2.7269309	2.7654777
						97	3.2579352	3.1010500	2.9786628	3.0044646	3.0273049
98	2.8429725	2.7024392	2.5925414	2.6116491	2.6285563
						101	2.8137873	2.6790354	2.5720044	2.5890631	2.6009190
104	2.6569141	2.5362910	2.4505976	2.4975719	2.5429113
						105	2.6596509	2.5265146	2.4224424	2.4448006	2.4643005
111	3.1773223	3.0121000	2.8731162	2.8699836	2.8620574
						112	3.0618374	2.8964953	2.7567500	2.7484109	2.7328569
114	3.2253943	3.0645868	2.9286512	2.9265368	2.9175012
						121	2.8656168	2.7146001	2.5930052	2.6033480	2.6102535
122	2.7944515	2.6535017	2.5419886	2.5586366	2.5701834
						182	2.7863607	2.6463632	2.5359134	2.5541041	2.5688598

184	2.8993291	2.7543339	2.6361256	2.6430525	2.6454279
						192	2.5984660	2.4693823	2.3647447	2.3749042	2.3856824
194	2.8959139	2.7525473	2.6366989	2.6478783	2.6577914
						296	3.4517896	3.2789090	3.1320186	3.1258765	3.1156200
298	3.3329988	3.1760424	3.0456279	3.0527128	3.0537364
						299	3.2332919	3.0759884	2.9449757	2.9452429	2.9401194
300	3.5038490	3.3378576	3.1956021	3.1875261	3.1714262
						301	3.2058022	3.0477713	2.9185792	2.9258217	2.9294176
302	3.4858460	3.3155259	3.1727706	3.1705485	3.1630533
						305	3.2026139	3.0428489	2.9097019	2.9063148	2.8973170
306	2.7300178	2.5926686	2.4839379	2.4988788	2.5080333
						307	3.2449502	3.0791198	2.9416381	2.9445546	2.9442020
308	3.4038658	3.2364438	3.0917977	3.0789686	3.0604384
						311	3.1066415	2.9516579	2.8262506	2.8369308	2.8419053
312	3.1794200	3.0146454	2.8816642	2.8958784	2.9087439
						314	2.9069415	2.7507511	2.6240619	2.6354615	2.6425368
315	2.9057517	2.7527923	2.6313261	2.6440335	2.6541930
						316	2.9485780	2.7907402	2.6619035	2.6681339	2.6722717
317	3.1511647	2.9937418	2.8649481	2.8692805	2.8661574
						318	2.8623808	2.7160483	2.5979605	2.6094560	2.6159421
320	3.0710698	2.9095312	2.7789621	2.7920790	2.8041894
						408	2.9224498	2.7720079	2.6478907	2.6548835	2.6575838
411	3.3171649	3.1610337	3.0322884	3.0374536	3.0374136
						414	2.9382821	2.7918466	2.6744862	2.6889460	2.7000461
419	2.7606781	2.6138393	2.4969041	2.5133429	2.5255486

Table 3

Adopt the PCA method that near infrared grain component analyser of the present invention is calibrated, error analysis is as shown in table 4, and every loose point such as Fig. 2 are to shown in Figure 4, and the trends of straight line of loose point are more obvious, be chemical score and measured value ratio more near 1, then the related coefficient between measured value and the actual value is higher.

Table 4

Sample composition	Moisture	Protein	Wet gluten
				Average error	0.270723	0.267521	0.820146
Mean square deviation	0.254979	0.375895	0.708458
				Related coefficient	0.973958	0.964482	0.945751

Measure respectively remaining 11 parts of verification samples in the analyser after above-mentioned process calibration, the result is as shown in table 5.

Table 5

Can obtain the test effect of the analyser after the PCA calibration to above-mentioned interpretation, as shown in table 6.

Table 6

Sample composition	Related coefficient	Standard deviation
			Moisture	0.9620	0.1661
Protein	0.9612	0.1656
			Wet gluten	0.9417	0.4770

Through above-mentioned experiment as can be known, it is very good that near infrared grain component analyser of the present invention detects effect, measurement result is close with corresponding stoichiometric number height, can reach the application requirements of agricultural production fully, having more simultaneously calibration no longer needs to provide the advantage of sample chemical score, make the result who records more reliable and more stable, easily operation can be the actual production debugging and saves a large amount of human and material resources and time resource, and the near infrared grain analyzer that contrasts other producers has very significantly technical advantage.

Embodiment 2

Get 55 parts of wheat samples, wherein 44 parts as calibration sample, all the other 11 parts as verification sample, this two duplicate samples has contained the various component content spans that may occur, and in the whole content range of composition, evenly distribute, utilize stechiometry to record the precise chemical structure value of 44 parts of each component contents of wheat calibration sample, as shown in table 7, each the composition stoichiometric number that obtains, the result who is used for measuring with near infrared grain component analyser of the present invention compares.

Table 7

Start near infrared grain component analyser of the present invention, 44 parts of wheat calibration samples are measured condition near infrared grain component analyser of the present invention respectively: room temperature, the instant measurement, spectral range is 825nm～1075nm, and resulting 11 groups of spectrum numerical value are shown in table 8 and table 9.

Table 8

Table 9

Adopt the PCA method that near infrared grain component analyser of the present invention is calibrated, error analysis is as shown in table 10, and every loose point such as Fig. 5 are to shown in Figure 7, and the trends of straight line of loose point are more obvious, be chemical score and measured value ratio more near 1, then the related coefficient between measured value and the actual value is higher.

Table 10

Sample composition	Moisture	Protein	Wet gluten
				Average error	0.199233	0.262292	0.617368
Mean square deviation	0.153019	0.192440	0.588847
				Related coefficient	0.977575	0.975095	0.967396

Measure respectively remaining 11 parts of verification samples in the analyser after above-mentioned process calibration, the result is as shown in table 11.

Table 11

Can obtain the test effect of the analyser after the PCA calibration to above-mentioned interpretation, the result is as shown in table 12.

Table 12

Sample composition	Related coefficient	Standard deviation
			Moisture	0.9858	0.1466
Protein	0.9794	0.1733
			Wet gluten	0.9584	0.3790

Claims

1. near infrared grain component analyser, comprise: sample chamber (8), be installed in valve (10) and the roller (12) of sample chamber (8) upper and lower side, the near infrared light path system and the transmitted light collection system that arrange near sample chamber (8) front window and rear hatch respectively, master system (19), the control module (18) that is electrically connected with master system (19); Described transmitted light collection system is electrically connected with control module (18);

It is characterized in that, also comprise: the first stepper motor (6) that is electrically connected with optical filter dish (5) that the employing aluminium alloy in the described near infrared light path system is made, the second stepper motor (9) and the 3rd stepper motor (14) that are electrically connected with valve (10) and roller (12) respectively;

Described the first stepper motor (6), the second stepper motor (9) and the 3rd stepper motor (14) all are electrically connected with control module (18), described control module (18) receives master system (19) instruction and controls the first stepper motor (6) and drive optical filter dish (5) and rotate and its filter wavelength is set, control the second stepper motor (9) opening and closing valve (10) and carry out blanking, control the 3rd stepper motor (14) drive roller (12) rotation and carry out discharging;

Near infrared light in the described near infrared light path system enters sample chamber (8) by sample chamber (8) front window sample is carried out transmission, the transmitted light collection system is delivered to control module (18) after processing by sample chamber (8) rear hatch receiving spectrum weak signal and to it, control module (18) is delivered to the spectroscopic data that collects in the master system (19), utilizes the spectral manipulation analysis software in the master system (19) that spectroscopic data is carried out analyzing and processing.

2. near infrared grain component analyser according to claim 1, it is characterized in that, described near infrared light path system also comprises: light source (1), collimation lens (2), coloured glass (3), plus lens (4) and frosted glass (7), the light of described light source (1) successively through collimation lens (2) collimation, coloured glass (3) filter, plus lens (4) converges adjustments, enter sample chamber (8) by sample chamber (8) front window after optical filter dish (5) filtering, frosted glass (7) adjustment intensity.

3. near infrared grain component analyser according to claim 2, it is characterized in that, described light source (1) adopts Halogen lamp LED, light source (1) is electrically connected with control module (18), and control module (18) receives the switch of master system (19) instruction control light source (1) and the light intensity magnitude of light source (1) is regulated.

4. near infrared grain component analyser according to claim 1, it is characterized in that, described transmitted light collection system comprises: near detector (15), the third stage amplifier (16) that is electrically connected with detector (15) of sample chamber (8) rear hatch setting and the A/D converter (17) that is electrically connected with third stage amplifier (16); Described A/D converter (17) is electrically connected with control module (18), described detector (15) receives near infrared light to carry out carrying the spectrum weak signal of sample message and the spectrum weak signal being converted to electric signal after the transmission to sample, third stage amplifier (16) carries out importing A/D converter (17) into behind the operation amplifier to electric signal, and A/D converter (17) is to import it into control module (18) after the digital signal with analog signal conversion.

5. near infrared grain component analyser according to claim 4 is characterized in that, described detector (15) is silicon detector.

6. near infrared grain component analyser according to claim 4 is characterized in that, described third stage amplifier (16) adopts AD820 chip, AD526 chip and the coupling of AD526 chip that the spectrum weak signal is carried out the three-stage operational amplification.

7. near infrared grain component analyser according to claim 1 is characterized in that, described coloured glass (3) is cutoff filter, is used for eliminating two auroral spectrums of near infrared light path system.

8. near infrared grain component analyser according to claim 1 is characterized in that, described optical filter dish (5) adopts filter type to divide optical mode, carries out the selection of specific wavelength behind the filtration visible light again, and complex light is converted to monochromatic light.

9. near infrared grain component analyser according to claim 1 is characterized in that, what also comprise the loading hopper (11) that is arranged on described valve (10) upper end and be arranged on described roller (12) lower end goes out funnel (13).

10. near infrared grain component analyser according to claim 1 is characterized in that, described control module (18) is microcontroller chip.