CN209802980U - near infrared spectrum analyzer - Google Patents

Abstract

The utility model relates to a cereal quality detects technical field, provides a near infrared spectroscopy analysis appearance, which comprises a housin, be equipped with light source device, beam split device, reaction tank and detection device in the casing, beam split device with light source device corresponds the setting, the reaction tank includes integrating sphere and a plurality of sample box, the integrating sphere with beam split device corresponds the setting for make monochromatic light by the first end of integrating sphere is penetrated and is shone the second end of integrating sphere, and is a plurality of the sample box sets up on rotary device, and is a plurality of the rotatable setting of sample box is in the second end department of integrating sphere, detection device sets up in the integrating sphere. The spectrum scanning detection of different samples is realized by rotating the sample box, the detection is simple and convenient, the detection efficiency is improved, and the accuracy of the detection result is ensured.

Description

Near infrared spectrum analyzer

Technical Field

The utility model relates to a cereal quality detects technical field, especially relates to a near infrared spectroscopy analysis appearance.

Background

The rapid determination of the main components of grains such as wheat, corn, soybean and the like is an important link in the production, storage, circulation and breeding processes of the grains, and can effectively ensure the quality safety. At present, the content detection of main components such as protein, fat, sugar and the like in grains is mainly performed by a chemical analysis method, although the precision is higher, the defects of sample damage, environmental pollution, time and labor consumption, higher cost and the like exist, and the near infrared spectrum rapid analysis method is widely applied in the fields of grains, meat products, medicines, dairy products and the like due to the advantages of rapidness, accuracy, greenness, high efficiency and the like, and has important significance for improving the automatic production level and increasing the economic benefit.

the near infrared spectrum information records the absorption of frequency doubling and frequency combination of hydrogen-containing groups (C-H, O-H, N-H and the like), most agricultural products contain the functional group, so that the near infrared spectrum covers a large amount of structure and composition information, a relation model of spectral information and a target to be detected can be established through a stoichiometric method, the near infrared spectrum information is used for qualitative or quantitative analysis of a sample, and main components of protein, fat and saccharide in grains contain the functional group, so that the quality of the grains can be analyzed through the near infrared spectrum, and in addition, other components containing the functional group can be analyzed through the near infrared spectrum. The wavelength of the near infrared light is 780-2526 nm, which is divided into short wave near infrared (wavelength 780-1100 nm) and long wave near infrared (wavelength 1100-2526 nm), the short wave band is commonly used for quality detection of liquid samples due to strong transmission capacity, and the long wave band is commonly used for reflection analysis, and is multipurpose for measurement of solid samples.

At present, although there are many studies on near infrared spectrometers, there are the following disadvantages in the current near infrared spectrometers for grain quality analysis:

(1) The sample and the spectrum do not react sufficiently, and the collected spectrum signal is greatly influenced by random factors, so that the measurement result is inaccurate;

(2) The sample replacing step is complicated, the sample box needs to be taken out again for sample replacement after one sample is scanned, and spectrum scanning and sample replacement cannot be carried out simultaneously;

(3) The existing spectrometer has large volume and complex operation, and cannot meet the production requirements of enterprises;

(4) The cost is high, and the requirements of low cost and high precision cannot be met.

SUMMERY OF THE UTILITY MODEL

the embodiment of the utility model provides a near infrared spectroscopy analysis appearance to it is loaded down with trivial details, the unsafe problem of testing result to solve current spectroscopy analysis appearance detection cereal sample change process.

An embodiment of the utility model provides a near infrared spectrum analyzer, which comprises a housin, be equipped with light source device, beam split device, reaction tank and detection device in the casing, beam split device with light source device corresponds the setting, the reaction tank includes integrating sphere and a plurality of sample box, the integrating sphere with beam split device corresponds the setting for make monochromatic light by the first end of integrating sphere is penetrated and is shone the second end of integrating sphere, and is a plurality of the sample box sets up on rotary device, and is a plurality of the rotatable setting of sample box is in the second end department of integrating sphere, detection device sets up in the integrating sphere.

The light source device comprises a light source, a heat dissipation device and a control circuit, wherein the light source is used for emitting composite light, the heat dissipation device is arranged on one side of the light source and is parallel to the light ray of the composite light, and the control circuit is connected with the light source.

wherein, beam splitting device includes first concave surface speculum, a plurality of dispersion gratings, second concave surface speculum and plane mirror, first concave surface speculum with light source device corresponds the setting for be parallel light with the light collimation and reflect extremely on the dispersion gratings, the second concave surface speculum with the dispersion gratings corresponds the setting, is used for with the monochromatic light collimation that the dispersion gratings decomposed is parallel light and reflects extremely the plane mirror, the plane mirror with the integrating sphere corresponds the setting, is used for passing through the monochromatic light reflection the first end of integrating sphere gets into in the integrating sphere.

The dispersion gratings are enclosed to form a light splitting assembly, the light splitting assembly is installed on a rotating base, and the rotating base is driven to rotate through a stepping motor.

The integrating sphere is a hollow sphere, a shading coating is arranged on the outer surface of the integrating sphere, and a reflecting coating is arranged on the inner surface of the integrating sphere.

And the second end of the integrating sphere is provided with a port which is in seamless butt joint fit with the opening of the sample box.

Wherein, rotary device includes the rotation axis, the rotation axis is equipped with a plurality of swinging arms, the number of swinging arm with the sample box one-to-one, the rotatable installation of one end of swinging arm is in on the rotation axis, the other end of swinging arm with the sample box is connected.

the detection device comprises a detector, an amplifying circuit and a temperature control circuit, wherein the detector is installed on the inner side wall of the integrating sphere, the amplifying circuit is connected with the detector, and the temperature control circuit is connected with the detector.

The shell is internally provided with a control device, and the control device is respectively connected with the light source device, the light splitting device and the detection device.

The end face of the shell is provided with a display device, and the display device is connected with the control device and used for data display and instruction input.

The embodiment of the utility model provides a pair of near infrared spectrum analyzer, light source device transmission composite light, divide into monochromatic light through beam splitting device, monochromatic light is jetted into the integrating sphere by the first end of integrating sphere in, and shine at the sample box that sets up at integrating sphere second end department, diffuse reflection takes place behind the monochromatic light scanning sample, receive optical signal by detection device, the rotatable setting of a plurality of sample boxes is in the second end department of integrating sphere, different sample boxes are equipped with different samples, realize the spectral scanning detection to different samples through rotatory sample box, and is simple and convenient, and the efficiency of detection is improved, and the accuracy of testing result has been guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a near infrared spectrum analyzer according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a near-infrared spectrum analyzer spectroscopic device according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an integrating sphere of a near infrared spectrum analyzer according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a sample box of a near infrared spectrum analyzer according to an embodiment of the present invention;

FIG. 5 is a flow chart of an apparatus of a near infrared spectrum analyzer according to an embodiment of the present invention;

Fig. 6 is a flowchart of the operation of the near infrared spectrum analyzer according to the embodiment of the present invention.

In the figure, 1: a housing; 2: a light source; 3: a heat sink; 4: a control circuit; 5: a first concave mirror; 6: a dispersion grating; 7: a second concave reflector; 8: a plane mirror; 9: an integrating sphere; 10: a sample cartridge; 11: a control device; 12: a display device; 13: a power supply device; 14: a data interface; 15: a partition plate; 16: a detector; 17: a rotating shaft; 18: rotating the arm.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, unless otherwise specified, "plurality", and "plural" mean two or more, and "several", and "several groups" mean one or more.

as shown in FIG. 1 to FIG. 6, the embodiment of the utility model provides a near infrared spectrum analyzer, including casing 1, be equipped with light source device, beam split device, reaction tank and detection device in the casing 1, whole small, convenient to carry. The light splitting device is arranged corresponding to the light source device, and the light source device is used as a basic part of the spectrum analyzer and is used for emitting the composite light; the light splitting device is used as a key part of the spectrum analyzer and is used for splitting the composite light emitted by the light source device into monochromatic light covering a near infrared waveband, and the higher the precision is, the higher the detection accuracy of the spectrum analyzer is.

Further, as shown in fig. 1, the light source device includes a light source 2, a heat sink 3, and a control circuit 4. The light source 2 is used for emitting continuous and stable composite light, and the spectrum range covers the whole near infrared region. In one example, the light source 2 is a tungsten halogen lamp with an emission wavelength of 300nm to 2.5um, which has high emission intensity, a working voltage of 5V, a working current of 2A, stable performance and a lifetime of 6000 hours or more. A filter (not shown in the figure) is arranged at the outlet of the light source to eliminate the multi-stage overlapped spectral lines.

Wherein, heat abstractor 3 sets up in one side of light source 2 and is parallel with the compound light ray that light source 2 sent for in time discharge the heat in light source room, reduce the influence of high temperature to other components and parts. Particularly, when the thermal power density of the spectrum analyzer exceeds 0.122W/cm3, forced cooling is required to improve the service life of the light source 2 and other parts. In one example, the heat sink 3 is a fan with a diameter of 10cm, a working voltage of 10V, high reliability and low design cost, and is mounted on the side wall of the light source chamber.

The control circuit 4 is connected with the light source 2 and used for providing a stable working power supply for the light source 2, improving the stability of the light source emitting composite light intensity and ensuring the measurement accuracy. In one example, considering that the current flowing through the filament when the halogen lamp is working affects the luminous intensity more sensitively than the voltage, a high-precision current stabilization source is designed, the precision of the current stabilization reaches 0.01%, and the current is adjustable to control the luminous intensity of the light source 2, wherein the adjustable range is 1.0000A-5.0000A.

Further, as shown in fig. 2, the light splitting means includes a first concave mirror 5, a plurality of dispersion gratings 6, a second concave mirror 7, and a plane mirror 8. The first concave reflector 5 is disposed corresponding to the light source device, and is used for collimating the light into parallel light and reflecting the parallel light onto the dispersion grating 6. In one example, a partition plate 15 is disposed between the first concave mirror 5 and the second concave mirror 7 to prevent the reflected light beams of the first concave mirror 5 and the second concave mirror 7 from crossing each other, so as to improve the accuracy of the detected data.

The dispersion grating 6 is used for decomposing the composite light into monochromatic light, and the spectrum of the near infrared band region is obtained through angle rotation. The blazed wavelength of the dispersion grating 6 is 1500nm, the number of the lines is 300/mm, the spectrum of the wave band of 750-300 nm can be obtained, and the resolution can reach 1nm at most. The dispersion gratings 6 with the same parameters are specifically arranged in three in the embodiment, and the three dispersion gratings 6 are divided into light splitting assemblies which are arranged on a rotating base which is driven to rotate by a stepping motor. The three dispersion gratings 6 are switched in a rotating way, the reset time is shortened, the scanning speed is improved, the rotating angle of the dispersion grating 6 is controlled by a stepping motor, and the control precision can reach 0.0008 degrees.

The second concave reflecting mirror 7 is disposed corresponding to the dispersion grating 6, and is configured to collimate the monochromatic light decomposed by the dispersion grating 6 into parallel light and reflect the parallel light to the plane reflecting mirror 8. The horizontally emitted composite light is reflected to the dispersion grating 6 through the combined action of the first concave reflector 5 and the second concave reflector 7, and then the decomposed monochromatic light horizontally irradiates on the plane reflector 8.

The plane mirror 8 is used for changing the propagation direction of the monochromatic light and does not act on other parameters of the monochromatic light. It is worth to be noted that the arrangement of the first concave reflecting mirror 5, the plurality of dispersion gratings 6, the second concave reflecting mirror 7 and the plane reflecting mirror 8 for the purpose of reasonably utilizing the space and making the internal structure layout of the spectrum analyzer more compact is within the protection scope of the present application without affecting the mutual operation.

Further, as shown in FIG. 3, the reaction cell is used to provide a place for the near infrared light to interact with the sample. The reaction cell comprises an integrating sphere 9 and a plurality of sample boxes 10, wherein the integrating sphere 9 is arranged corresponding to the light splitting device and used for enabling monochromatic light to enter from a first end of the integrating sphere 9 and irradiate on a second end of the integrating sphere 9. Specifically, the plane mirror 8 is disposed corresponding to the integrating sphere 9, and is used for reflecting monochromatic light into the integrating sphere 9 through a first end of the integrating sphere 9.

Specifically, the integrating sphere 9 is a hollow sphere, and a light-shielding coating is arranged on the outer surface of the integrating sphere 9 to reduce the light attenuation to the maximum; the inner surface of integrating sphere 9 is provided with a reflective coating to increase the reflectivity for more spectral signals to be collected.

In one example, considering that grain particles are generally large and require a sufficient contact area with near infrared light to reduce the influence of random factors, the integrating sphere 9 has an inner diameter of 10cm and an outer diameter of 12cm, the outer light-shielding coating is black in color, and the inner coating is highly reflective barium sulfate to reduce the influence of external light. The second end of integrating sphere 9 is provided with a port fitting in a seamless butt joint with the opening of sample cartridge 10, the internal cross-sectional area of the port being 2 cm.

Wherein, a plurality of sample boxes 10 set up on rotary device, and the rotatable setting of a plurality of sample boxes 10 is in integrating sphere 9's second end department, realizes online sample through rotatory sample box 10 and changes, improves detection efficiency. Specifically, the rotating device includes a rotating shaft 17, a plurality of rotating arms 18 are disposed on the rotating shaft 17, the number of the rotating arms 18 corresponds to the number of the sample boxes 10, and four sample boxes 10 are disposed in this embodiment. One end of the rotating arm 18 is rotatably mounted on the rotating shaft 17, and the other end of the rotating arm 18 is fixedly connected with the sample box 10, as can be understood, one end of the rotating arm 18 is welded with the bearing, the bearing is sleeved on the rotating shaft 17, and the other end of the rotating arm is welded with the sample box 10. It can be understood that near infrared light is incident from the top end of the integrating sphere 9 and irradiates on the bottom end of the integrating sphere 9, the opening of the sample box 10 is in seamless butt joint with the port at the bottom end of the integrating sphere 9, spectrum scanning of the near infrared light on a sample in the sample box 10 is realized, and light rays completing the scanning return to the integrating sphere 9 and are received by a detection device in the integrating sphere 9.

Wherein, the surface of sample box 10 is equipped with the black coating, prevents the loss of near infrared light, and the upper end opening of sample box 10 to with the port seamless coincidence of the second end of integrating sphere 9, prevent the light leak. In one example, the sample box 10 is designed to be a conical cylinder with a wide upper end and a narrow lower end, different grain samples are filled in different sample boxes 10, so that the samples can be switched only by shifting the sample boxes 10, the spectrum scanning efficiency is improved, the bottom plate of each sample box 10 can be opened, the spectrum scanning and the sample replacement are carried out simultaneously, and the sample replacement efficiency is improved.

Further, a detection device is disposed in the integrating sphere 9 to collect reflected light carrying information on the structure and tissue of the sample and convert the light signal into a digital signal. Specifically, the detection device includes a detector 16, an amplification circuit, and a temperature control circuit.

The detectors 16 are installed on the inner side wall of the integrating sphere 9, and in this embodiment, the two detectors 16 are symmetrically installed on the inner side wall of the middle of the integrating sphere 9, so as to convert the optical signal into an analog signal, and average the collected signal, so as to reduce the influence of random factors. In one example, the detector 16 is an indium gallium arsenide PIN photodiode with fast response speed and high sensitivity, and the spectral response range is 900-2570 nm.

The amplifying circuit is connected to the detector 16 for amplifying the signal and converting the analog signal into a digital signal. In one example, to suppress common mode noise and improve signal-to-noise ratio, the amplifier circuit selects an a/D8476 chip for differential amplification, which can realize 24-bit high-precision conversion.

The temperature control circuit is connected to the detector 16 to ensure that the detector 16 operates at a constant temperature, so as to achieve high measurement accuracy and performance. In one example, the control chip of the temperature control circuit employs MAX1969 to control the TEC inside the probe 16 to cool by varying the current change.

Further, a control device 11 is further arranged in the housing 1, and the control device 11 is respectively connected with the light source device, the light splitting device and the detection device. The control device 11 controls the intensity of the emitted composite light by controlling the current intensity of the light source device, the control device 11 decomposes the composite light into monochromatic light by controlling the rotation angle of the light splitting device, and the control device 11 acquires the detection digital signal through the detection device. Specifically, the control device 11 is responsible for initialization, optical path transmission, mode selection, resolution setting, spectrum scanning, data transmission, and the like of the spectrum analyzer, and is a brain for normal operation of the spectrum analyzer, which is completed by cooperation of hardware and software.

The control device 11 includes a processor, a communication interface, a wireless transmission module, a storage module, and a device program. The processor performs control of the hardware device and processing of the spectral data.

In one example, considering that data operation needs to be performed on a large amount of spectral data in the later period, the TMS320C67xx series DSP chips with high operation speed and good compatibility are selected as the processor; the communication interface adopts an RS232 serial port to communicate with an upper computer, and can complete the read-write operation of data; the wireless transmission module can transmit locally stored spectrum data or detection records to a local area network or the Internet, and a wireless network card of a high-performance Prism chip set and a design scheme of an embedded wireless local area network terminal based on a DSP can be selected and can be well compatible with the DSP chip; the storage module is used for storing spectral data and detection results, a 4GB storage space is expanded in an SD card mode, the problem of insufficient storage space is solved, and the read-write speed can reach more than 2 Mbyte/s.

The device program is a software part and is used for guaranteeing the normal work of the device, the functions of instrument resetting, resolution setting, sample spectrum scanning, real-time display, data storage and the like are included, and the development language is C + +.

Furthermore, the end face of the housing 1 is provided with a display device 12, and the display device 12 is connected with the control device 11 for data display and instruction input. In one example, the display device 12 is a touch-controlled LCD display screen with high resolution and stable performance, and has a size of 10 inches, so that not only can data such as the running state, spectral information, and operation result of the instrument be displayed, but also a data interaction function can be provided, and the instrument can be started, reset, closed, selected by mode, set by network, set by parameters, input by data, exported by direct point touch, and the like.

Further, a power supply device 13 is included to supply power to other devices. In one example, the power supply device 13 is externally connected with 220V alternating current, 10V and 5V direct current power supplies are obtained by using a voltage stabilizing chip LM2576HVT-12, and a fusing protection device is arranged to prevent the instrument from being damaged by overvoltage.

In one example, the system further comprises data processing means for performing post-processing on the scanned spectrum, including both the calibration modeling and pattern recognition. The method specifically comprises the steps of spectrum data preprocessing, wave band and characteristic value optimization, establishment of a correction model, model verification, pattern recognition and the like, and a prediction model with high accuracy and good stability is selected through cyclic traversal of evaluation indexes to predict the contents of main components such as protein, fat, sugar and the like in the grains. The programming language is uniformly realized by C + +.

The data preprocessing is used for reducing the influence of baseline drift, high-frequency noise and external environmental factors on spectral data, and four processing modes of algebraic operation, multivariate scattering correction, baseline correction and differentiation are provided.

the wave band and the characteristic value are preferably used for eliminating independent variables and redundant information, the wave band and the characteristic value with high correlation are preferably selected, the stability of the model is improved, and genetic algorithm is adopted for optimization.

The calibration model is established by establishing an incidence relation between the collected sample set spectral data and the grain component content for quantitative or qualitative analysis, and the built-in linear modeling method comprises principal component regression, partial least square regression and multiple linear regression, and the nonlinearity is regional weight regression and artificial neural network.

The model verification is to evaluate the stability and accuracy of the established correction model, screen out a high-quality verification model, and judge by adopting three indexes of a correlation coefficient, a correction set standard deviation and a prediction set standard deviation.

The pattern recognition is a process of predicting the content of the main components of the unknown grain sample through the obtained correction model, and the quality analysis is completed.

As shown in fig. 6, the detection work flow of the embodiment of the present invention is as follows:

(1) 80 grain samples are collected, the grain samples cover a plurality of varieties, a plurality of regions and a plurality of years as far as possible, the component content range is wide, the concentration distribution is uniform, the modeling samples are guaranteed to have better representativeness, the protein, fat and sugar content of all the samples are measured by a standard chemical method to be used as reference values, and the samples are divided into a correction set and a prediction set according to the ratio of 3: 1.

(2) Opening the near infrared spectrum analyzer and initializing the instrument and correcting the baseline, namely using a scanning white board as the baseline, deducting the baseline when the grain sample is scanned each time to reduce the influence of the background spectrum, setting the instrument into a correction mode, namely establishing a correction model, starting to acquire the near infrared spectrogram of all samples after the instrument is stable, and storing the near infrared spectrogram in local for later use by naming serial numbers.

(3) The acquired spectral data is subjected to data preprocessing, and four algorithm combination modes are adopted for processing, namely algebraic operation, multiple scattering correction, baseline correction and microprocessing, so that the signal-to-noise ratio is improved, and the spectral resolution is improved.

(4) The wave band and the characteristic value of the preprocessed spectral data are optimized, variable information with high correlation is screened out, five modeling algorithms are adopted to respectively establish correction models of protein, fat and sugar in the grains, namely 5 correction models are established for screening of each component.

(5) and (3) checking the established correction model, namely, internal checking and external checking, automatically traversing and screening the correction model with good correlation, high prediction precision and best stability from the 5 models by the data processing device, and storing the model with the optimal prediction of each component in the local.

(6) the spectrometer is set to be in a detection mode, an unknown grain sample is placed in the sample box to scan the near infrared spectrum of the unknown grain sample, the content of protein, fat and sugar in grains can be rapidly analyzed by taking a correction model stored locally, and the process of mode recognition is completed.

The embodiment of the utility model provides an advantage as follows:

(1) A reflection-type sample cell is designed according to the characteristics of a grain sample, the light collection efficiency is improved by adopting an integrating sphere structure, and the influence of random factors is reduced by placing two detectors for equalization treatment.

(2) it installs on the rotation axis to have designed 4 rotatable sample boxes, and with the seamless laminating of the second end of integrating sphere, only need rotatory sample box just can change the sample, and the sample box bottom plate can be opened, and spectrum scanning and sample change can go on simultaneously, have improved work efficiency.

(3) The positions and the sizes of all parts of the spectrometer are reasonably designed, the compactness of the spectrometer is improved, the size of the whole spectrometer body is only 25cm multiplied by 20cm, the manufacturing cost is reduced, and the popularization is facilitated.

(4) The design of the light splitting device is high in resolution, simple in structure and low in cost, and the near infrared spectrum with wide range and high precision can be obtained by combining a software control device, the highest resolution can reach 1nm, the wavelength scanning speed is greater than 80nm/s, and the obtained near infrared full-band spectrum is about 10 seconds.

(5) The spectrometer provides two working modes of correction and detection, various algorithms such as built-in spectrum preprocessing, wave band and characteristic value optimization, model correction and the like can be used for automatically traversing and matching an optimal prediction model according to the components of the target to be detected, and the prediction precision is improved.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a near infrared spectrum analyzer, includes the casing, its characterized in that, be equipped with light source device, beam split device, reaction tank and detection device in the casing, beam split device with light source device corresponds the setting, the reaction tank includes integrating sphere and a plurality of sample box, the integrating sphere with beam split device corresponds the setting for make monochromatic light by the first end of integrating sphere is penetrated and is shone and be in the second end of integrating sphere, it is a plurality of the sample box sets up on rotary device, and is a plurality of the rotatable setting of sample box is in the second end department of integrating sphere, detection device sets up in the integrating sphere.

2. The nir spectrum analyzer of claim 1, wherein the light source device includes a light source for emitting composite light, a heat sink disposed on one side of the light source and parallel to the composite light ray, and a control circuit connected to the light source.

3. The near infrared spectrum analyzer as claimed in claim 1, wherein the light splitting device comprises a first concave reflector, a plurality of dispersion gratings, a second concave reflector and a plane reflector, the first concave reflector is disposed corresponding to the light source device for collimating light into parallel light and reflecting the parallel light onto the dispersion gratings, the second concave reflector is disposed corresponding to the dispersion gratings for collimating monochromatic light decomposed by the dispersion gratings into parallel light and reflecting the parallel light onto the plane reflector, and the plane reflector is disposed corresponding to the integrating sphere for reflecting the monochromatic light into the integrating sphere through the first end of the integrating sphere.

4. The NIR Spectrum analyzer as claimed in claim 3, wherein a plurality of said dispersion gratings are enclosed into a beam splitting module, said beam splitting module is mounted on a rotating base, and said rotating base is rotated by a stepping motor.

5. The near infrared spectrum analyzer as defined in claim 1, wherein the integrating sphere is a hollow sphere, the outer surface of the integrating sphere is provided with a light-shielding coating, and the inner surface of the integrating sphere is provided with a reflective coating.

6. The NIR spectrometer of claim 5, wherein the second end of the integrating sphere is provided with a port adapted for seamless docking with the opening of the sample cell.

7. The near infrared spectrum analyzer as claimed in claim 1, wherein the rotating device comprises a rotating shaft, the rotating shaft is provided with a plurality of rotating arms, the number of the rotating arms corresponds to that of the sample box one by one, one end of each rotating arm is rotatably mounted on the rotating shaft, and the other end of each rotating arm is connected with the sample box.

8. The NIR spectrometer of claim 1, wherein the sensing device comprises a detector mounted on an inner sidewall of the integrating sphere, an amplification circuit coupled to the detector, and a temperature control circuit coupled to the detector.

9. The near infrared spectrum analyzer as claimed in any one of claims 1 to 8, wherein a control device is further provided in the housing, and the control device is connected to the light source device, the light splitting device and the detection device respectively.

10. The nir spectrum analyzer of claim 9, wherein the end face of the housing is provided with a display device, and the display device is connected with the control device for data display and command input.