CN105092516A - Digital light processing technology-based portable liquid food near infrared spectroscopy analyzer - Google Patents
Digital light processing technology-based portable liquid food near infrared spectroscopy analyzer Download PDFInfo
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Abstract
The invention discloses a digital light processing technology-based portable liquid food near infrared spectroscopy analyzer. The digital light processing technology-based portable liquid food near infrared spectroscopy analyzer comprises a LED light source assembly, a reflective mirror/condensing lens, a blazed grating, a digital micromirror assembly, a single-photon detector, a linear detector and a spectral information processing system. The near infrared spectroscopy analyzer utilizes a matrix composed of multiple LED chips as a near infrared spectroscopy analyzer light source. The condensing lens is arranged at the outer side of the LED chip so that a light source luminescence area is reduced and enough light source intensity is provided. The LED chip has the characteristics of high light intensity and low power and is conducive to reduction of a near infrared spectroscopy analyzer volume so that the near infrared spectroscopy analyzer is portable and is suitable for fluid food detection.
Description
Technical field
The present invention relates to food additives detection technique field, be specifically related to a kind of portable fluid food near-infrared spectrometers based on digital light treatment technology.
Background technology
Antiseptic is food additives conventional in various slop (as fruit juice, wine, dairy products), effectively can extend the shelf-life of the higher slop of water cut.Wherein benzoic acids antiseptic is particularly common in food processing industry at home.Benzoic acids antiseptic excessive in slop easily caused the intoxicating phenomenon seriously crossed, and therefore, benzoic acid content is an important test item in food inspection.Now conventional near infrared spectrometer detects the content of antiseptic in food.
Near infrared light (NearInfrared, NIR) be between visible ray (VIS) and in electromagnetic radiation as waves between infrared (MIR), U.S. material detects association (ASTM) and is defined as the region of 780 ~ 2526nm in infrared spectral region nearly, is first non-visible light district that people find in absorption spectrum.Near infrared spectrum district is consistent with the uptake zone of the sum of fundamental frequencies that hydric group in organic molecule (OH, NH, CH) vibrates and frequency multiplication at different levels, by the near infrared spectrum of scanning samples, the characteristic information of organic molecule hydric group in sample can be obtained, and utilize near-infrared spectrum technique analyze sample have easily and fast, efficiently, accurately lower with cost, do not destroy sample, do not consume chemical reagent, the advantage such as free from environmental pollution, near infrared spectrometer has been widely used in the fields such as agricultural production industry, petroleum chemicals, clinical diagnosis, environment measuring.
In the food industry, near infrared spectrometer is many times analyzed for being carried to scene, therefore the near infrared spectrometer need compact, being convenient for carrying, the kind of existing portable near infrared spectrometer has a lot, can be divided into according to light channel structure difference: optical filtering flap-type, grating type, Fourier transform type, MEMS (micro electro mechanical system) (MEMS) type based on digital micromirror elements (DMD).
The ZX-50 series hand held near infrared Grain Analysis instrument of Zeltex company is the Typical Representative of optical filtering flap-type, and its shortcoming is that wavelength number is limited, and accuracy and precision are not high.
In Nanjing the ZDJIPB-1 near infrared spectrometer of instrument be the Typical Representative of raster scan type spectrometer, but because there being moving-member to cause the shock resistance of instrument poor, sweep velocity is relatively slow.
The luminous flux of Fourier transform type spectrometer is large, resolution is high, but shock resistance is poor, is difficult to make portable instrument.
DLP is the abbreviation of " DigitalLightProcession ", is digital light process, and that is this technology wants elder generation signal of video signal through digital processing, and then light is projected.It is based on TI(Texas Instruments) digital micromirror elements---the DMD(DigitalMicromirrorDevice of company's exploitation) carry out the technology of viewable numbers information displaying.Digital micromirror elements (DMD) is used to carry out spectrum selectivity instrument with the linear array detector in the digital micromirror elements of low cost (DMD) chip and single-point detector replacement grating array type spectrometer, cost greatly reduces, apparatus structure is simple, make easily, realize Hadamard transform with different combination (Adama template) gating multiple row micro mirrors, signal to noise ratio (S/N ratio) does not more use conversion greatly to promote.Wavelength accuracy 0.6nm, instrument is tested through various industry spot, and stability is better, but is subject to the restriction of single detector performance, and it is limited to the detectivity of faint spectrum.For addressing this problem, application number be 2014101058442 Chinese invention patent application provide a kind of near infrared spectrometer, comprise light source, parabolic mirror, blazed grating, Digital Micromirror Device, line detector, single-photon detector, spectral information disposal system; Described light source is arranged on the focus place of parabolic mirror, and light source projects in sample after parabolic mirror collimation, and unabsorbed light is separated into monochromatic collimated beam through blazed grating and projects in Digital Micromirror Device on one-level blazing angle; Micro mirror in Digital Micromirror Device produces the deflection of+12 ° and-12 °, is reflexed to respectively by monochromatic collimated beam on line detector and single-photon detector; The spectral information that spectral information disposal system receives line detector and single-photon detector merges, Hadamard transform process, obtains the spectral intensity of original spectrum signal.For improving accuracy of detection, its light source is required to be pointolite, but be limited to the volume of detector, existing pointolite intensity is difficult to meet demand that slop detects (because slop turbidity is higher, and normal suspension uses the polymer substance such as pectin, protein, by the transmission in the sample to which of interference light, light is weakened, and then make the light signal strength deficiency entering blazed grating).Matrix LED energy consumption is low and can be made as less volume, and abundant LED can provide the light intensity meeting testing requirement.But its area of light source of too much LED chip composition is comparatively large, cannot form pointolite.Adopt can be used as pointolite laser generator as light source time, its higher power consumption and intelligence produce monochromatic character will make near infrared spectrometer volume be controlled.
How to overcome above-mentioned the deficiencies in the prior art and become an existing photoelectric analysis field emphasis difficult problem urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention discloses a kind of high precision, portable near infrared spectrometer.
Object of the present invention is achieved through the following technical solutions:
A kind of portable fluid food near-infrared spectrometers based on digital light treatment technology, comprise LED light source component, reflective mirror, blazed grating, digital micro-mirror assembly, single-photon detector, line detector and spectral information disposal system, described spectral information disposal system and described digital micro-mirror assembly, single-photon detector, line detector communicate to connect; Described LED light source component comprises heat-radiating substrate, covers the wiring board on heat-radiating substrate and is installed on the multiple LED chips on wiring board; Described PCB surface is coated with light shield layer; Described reflective mirror is parabolic reflector, and described LED light source component is arranged on the focus place of parabolic reflector.
Described light source assembly can also adopt following encapsulating structure, and this encapsulating structure comprises carrier, and this carrier is provided with die cavity, and this cavity bottom is provided with described wiring board and LED chip, is filled with hot isolated material in this die cavity, and this mold cavity surface is provided with phosphor powder layer; This phosphor powder layer comprises organic Red phosphor layer and YAG fluorescent powder layer, and this organic red phosphor powder layer is layered on phosphor powder layer.This YAG fluorescent powder layer is made up of YAG fluorescent powder, and this YAG fluorescent powder is YAG yellow fluorescent powder or YAG green emitting phosphor.This hot isolated material can be silica gel or other there is the material of fine hot isolation effect and transmittance simultaneously, to ensure the high-quantum efficiency of fluorescent powder.In the present embodiment, all adopt silica gel as hot isolated material.Organic red phosphor powder layer and YAG fluorescent powder layer are individual layer, and are microscler film, and this organic red phosphor powder layer is layered on YAG fluorescent powder layer and forms double membrane structure.Above-mentioned technology not only can improve the high color rendering index (CRI) of white light LEDs, can ensure the low decay of luminescence efficiency simultaneously, thus ensure good luminescence efficiency.This technology is to jump out the inefficient limitation of inorganic red light-emitting phosphor in conventional white light LED and uses organic red fluorescent powder, and because luminous organic material possesses, MOLECULE DESIGN is flexible, of a great variety, structures and spectroscopies is easily controlled, wider glow color is selected, luminescence efficiency is high, be easy to a series of advantages such as large area film forming, cost is low, technique is simple.These advantages make organic red fluorescent powder have very large advantage in the preparation and improvement of material itself, can for white light LEDs higher colour rendering index is provided while ensure high-luminous-efficiency.In addition, this technology can be used in different far field packing forms or hot insulation package form, to ensure that the high conversion quantum efficiency of fluorescent powder realizes high color rendering index (CRI) and the long-life of white light LEDs simultaneously.
Further, the micro mirror in described Digital Micromirror Device can ± 12 ° of rotations; Reflected light when described single-photon detector and micro mirror ﹢ 12 ° rotate is on same straight line; Described line detector and micro mirror are born 12 ° of reflected light when rotating and are on same straight line; Described single-photon detector is single photon avalanche diode detector; Described line detector is lead sulfide photodetector.The DLP4500NIR chipset that described spectral information disposal system is produced for Texas Instrument
Further, the present invention selects DLP4500NIR chipset as described spectral information disposal system, and this is the DLP chipset of a optimization near infrared light technology.Quick, programmable pattern speed can be supported, and complete numeral switching by reflection micro-electromechanical system (MEMS) micromirror technologies of service-strong Digital Micromirror Device of the present invention, and mobile phone and process are carried out to the data of described line detector and single-photon detector, form spectral results.Meanwhile, this chipset can meet the various demand providing the high-performance of factory and onsite application, economic near infrared spectrometer required for the present invention.
Meanwhile, described Digital Micromirror Device (DMD) technology and video camera, sensor, automobile or other peripherals by existing SDK kit, can be integrated, thus easily realize the structure of 3D point cloud by said chip group.The main advantage of SDK is realize programmable pattern speed fast, and service-strong reflection MEMS micromirror technologies completes numeral switching.
Described LED light source component also comprises the collector lens be arranged on outside LED chip; Described collector lens comprises the transparent cone covered outside LED chip; Described transparent cone side wrap has light shield layer, and the height of light shield layer is lower than the height at cone top.Described collector lens is that high printing opacity makrolon material is made, and described high its raw material of printing opacity makrolon material comprises the Graphene of 50 ~ 70 parts of polycarbonate, 0.1 ~ 0.2 part of fire retardant, 0.5 ~ 0.9 part of compatilizer and 0.4 ~ 1 part by weight.The height of described transparent cone is 0.2 ~ 0.5 times of parabolic reflector focal length.The polycarbonate of high printing opacity, the arrangement of its molecular structure of polycarbonate is comparatively neat, is approximately a kind of stratiform, linear arrangement mode, the infrared light entered in makrolon material can be made to transmit along certain direction.And Graphene has neat individual layer sheet layer structure especially, when graphene dispersion is in polycarbonate, due to the effect of Van der Waals force between Graphene (vanderwaalsforce), Graphene will be dispersed in polycarbonate in parallel to each other, guide infrared light to conduct along certain direction.More preferred; the present invention selects the Graphene of sulfonylation process; such as with the Graphene (specifically see PingWen, the people such as PeiweiGong are published in " the Scalablefabricationofhighqualitygraphenebyexfoliationofe dgesulfonatedgraphiteforsupercapacitorapplication " of RSCAdvances periodical in July, 2014) of tosyl.Sulfonyl, for providing stronger Van der Waals force between graphene molecules, contributes on the one hand keeping layered distribution shape body parallel between Graphene in polycarbonate, also contributes on the other hand improving the dispersiveness of Graphene in polycarbonate, prevent it from precipitating.Graphene can make infrared light be blocked, and therefore the present invention is particularly limited to the concentration of Graphene, farthest improves the directed radiation of infrared light while report makrolon material light transmission.Described fire retardant, compatilizer all can select commercially available polycarbonate fire retardant and compatilizer to realize.Compatilizer is mainly used in connecting polycarbonate molecule and graphene molecules, keeps the stability of Graphene-polycarbonate system.The flaws such as in addition, inventor finds that the makrolon material being added with Graphene has outstanding ageing resistance, and Long-Time Service still has good penetrability, flawless, atomization produce.
Particularly preferred, LED chip can wrap up by described transparent cone completely, and it can be that inner side is reflective that described shading is surveyed, and shading is surveyed then can prevent condenser light leak.The light that LED chip sends can strengthen in condenser inside, and control when reflective inside shading is surveyed, the height controlling light shield layer also can produce constructive interference.Because the height of light shield layer is lower than cone top, therefore cone top is not blocked layer parcel, and the downward projection of extending part is a circular light spot.Light finally can penetrate from the top of this cone, forms an approximate pointolite.
The present invention also provides a kind of method adopting antiseptic in described near infrared spectrometer Fast nondestructive evaluation fruit juice.
Particularly preferred, described antiseptic is benzoic acids antiseptic, specifically comprises the following steps:
S1. by the greenhouse cooling to 1 of sample-3 DEG C, the concentration of to add volume be the concentration of 1%-5% of sample to be the sodium-chloride water solution of 10-30mol/mL and volume be sample 0.5%-1% is the Graphene aqueous suspensions of 3-5mol/mL, obtains bulk processing sample;
S2. rotary shaker is adopted to carry out concussion process to bulk processing sample;
S3. the pH value of bulk processing sample is adjusted to 5.6-6.1;
S4. heat bulk processing sample, at 30-40 DEG C, insulation leaves standstill;
S5. sample is cooled to 2-5 DEG C, filters sample, collecting filtrate is first filtrate;
S6. deionized water filter residue and volume being equaled filtrate mixes, and adopts vacuum filtration, and collection filtrate is eluent;
S7. first filtrate is mixed with eluent, adopt Rotary Evaporators rotary evaporation at 30-40 DEG C, until its volume is down to equal with sample, obtain results sample;
S8. the concentration of antiseptic in described near infrared spectrometer measurement result sample is adopted.
Described employing rotary shaker to bulk processing sample carry out concussion process refer to the rotating speed of 100-300 turns/min under 5-10 degrees Celsius of constant temperatures to bulk processing sample concussion 10-25min.
The present invention, before the absorption spectrum of collected specimens, has carried out a series of pre-treatment to it, to improve the degree of accuracy of testing result.Typically, the antiseptic of the colloid para Toluic Acid class that the pectin in fruit juice, protein etc. are insoluble has stronger suction-operated, and Interference Detection also makes testing result far below actual content.Designer finds, under low temperature and sodium chloride, Graphene existent condition, the large molecular suspension thing such as the pectin in sample, protein is to the constraint declines of such antiseptic, antiseptic is easier, and from these materials, loss is in sample, and the sample concentration of preservatives that employing near infrared spectroscopy is tested is more close to its actual value.Described Graphene aqueous suspensions is commercially available Graphene and the potpourri of water.Concussion process then can promote that large molecular suspension thing discharges the process of antiseptic.Heat sample under the pH condition of S3, originally mutual compared with materials such as the fruit juice of stable suspersion in samples of juice, protein Van der Waals force weakens, and easily flocculates, sedimentation, is conducive to being removed in subsequent treatment.The surface of filter residue can be adsorbed with the antiseptic of a part usually, to adopt deionized water can enter in filtrate by its wash-out, makes testing result more accurate.The present invention also reduces the volume of mixture of filtrate and eluent, makes it consistent with the initial volume of sample, to reduce the step calculating testing result, also can reduce error rate, improves accuracy of detection while improving detection efficiency.Especially this potpourri is concentrated, also reduce the requirement to infrared spectrometer susceptibility, thus compressed detected cost.Because benzoic acids antiseptic thermotolerance is poor, the present invention selects the mode that low temperature revolves steaming to concentrate said mixture especially, to reduce the loss of antiseptic in concentration process.The alleged concentration of antiseptic in described near infrared spectrometer measurement result sample that adopts of step 8 can near infrared spectrometer of the present invention be that hardware selects the method for any one test organic concentration to carry out application by analogy.
Further, in described employing infrared spectroscopic determination results sample, the concentration of antiseptic refers to the fruit juice standards solution adopting analytically pure benzoic acids antiseptic preparation variable concentrations, obtains the abosrption spectrogram of the fruit juice standards solution of each concentration; Use multivariate calibration methods to set up the mathematical model of relation between antiseptic content and absorption spectrum in sample, and model is verified; Obtain the absorption spectrum of results sample, obtain the concentration of antiseptic in results sample by described calculated with mathematical model.
Especially, step 8 of the present invention have references to the Chinese invention patent near infrared quick non-destructive detection method of Aspartame " in the fruit juice " that application number is 2004101039768, and has carried out adaptive amendment according to the character of benzoic acids antiseptic to it.Its concrete operation step mainly comprises:
Analytically pure antiseptic is adopted to make the fruit juice standards solution (0.1-3mg/mL) of a series of variable concentrations, as the sample library of founding mathematical models.Adopt near infrared spectrometer of the present invention to test the fruit juice standards solution of different preservatives concentration, wavelength coverage is chosen to be 780nm-2500.Record the absorption spectrum of each standard solution.Use multivariate calibration methods, the continuous wavelength near infrared spectrum computing method in the multivariate calibration methods of specifically Chemical Measurement and discrete wave progress infrared spectrometer calculate the mathematical model of relation between antiseptic content and absorption spectrum described in method establishment.Concrete grammar can adopt described application number to be method described in the Chinese invention patent of 2004101039768.Collect the absorption spectrum of results sample, adopt above-mentioned mathematical model just finally can obtain the concentration (content) of antiseptic in sample.
Described multivariate calibration methods is the multivariate calibration methods of Chemical Measurement.
The present invention, relative to prior art, has following beneficial effect:
1. near-infrared spectrometers provided by the invention select multiple LED chip to form matrix as the light source near infrared spectrometer, simultaneously special in LED chip arranged outside collector lens, so reduce light source light-emitting area, ensure that light source can provide enough light intensity; And LED chip has high light intensity, lower powered feature, be conducive to the volume reducing near infrared spectrometer product of the present invention, make it more portable, be more applicable for fluid food and detect.
2. the present invention selects DLP4500NIR chipset as described spectral information disposal system, and then improves data-handling efficiency, shortens data processing time, enables the present invention measure the composition of fluid food quickly and accurately.
The present invention adopts the concentration of preservatives in infra-red sepectrometry detection fruit drink, and sample pre-treatments is simple, and without the need to carrying out degree of depth purification to antiseptic, detection efficiency is higher than existing HPLC(liquid chromatography) method, be conducive to promoting in large-scale industrial production.
2. the present invention is by carrying out a series of simple process to samples of juice, and the material such as pectin, protein in elimination fruit juice is to the interference of antiseptic testing result, and its degree of accuracy may be up to ± 0.05mg/mL.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the partial enlarged drawing of reflexed light ring of the present invention.
Fig. 3 is the schematic diagram of probe body of the present invention.
Fig. 4 is the structural representation of LED infrared light supply assembly of the present invention.
Embodiment
The present invention to be described in further detail below in conjunction with embodiment for the ease of it will be appreciated by those skilled in the art that:
Embodiment 1
The present embodiment provides a kind of portable fruit juice to detect infrared spectrometer, and as shown in Figure 1, it comprises hand-holdable shell 1, is located at shell with the light emission mouth 2 of one end and the blazed grating 3 collecting reflection ray.
Its inner structure as shown in Figure 2, comprise LED light source component 21, reflective mirror, blazed grating 3, digital micro-mirror assembly 4, single-photon detector 6, line detector 7 and spectral information disposal system, described spectral information disposal system 5 communicates to connect with described digital micro-mirror assembly, single-photon detector, line detector; It is characterized in that: described LED light source component comprises heat-radiating substrate, covers the flexible circuit board on heat-radiating substrate and is installed on the multiple LED chips in flexible circuit board; Described flexible circuit board surface coverage has reflector layer; Described reflective mirror is parabolic reflector, and described LED light source component is arranged on the focus place of concave mirror.As Fig. 3, Fig. 4, described LED light source component also comprises the collector lens 21 be arranged on outside LED chip; Described optically focused is saturating, and 21 comprise the transparent cone 211 covered outside LED chip; Described transparent cone side wrap has light shield layer 212, and the height of light shield layer is lower than the height at cone top
The present embodiment also provides a kind of near infrared spectrum quick nondestructive to detect the method for concentration of preservatives in fruit juice, comprises the following steps:
S1. by the greenhouse cooling to 2 of sample DEG C, the concentration of to add volume be the concentration of 3% of sample to be the sodium-chloride water solution of 25mol/mL and volume be sample 0.5% is the Graphene aqueous suspensions of 3mol/mL, obtains bulk processing sample;
S2. rotary shaker is adopted to carry out concussion process to bulk processing sample;
S3. the pH value of bulk processing sample is adjusted to 6;
S4. heat bulk processing sample, at 30 DEG C, insulation leaves standstill 10min;
S5. sample is cooled to 5 DEG C, filters sample, collecting filtrate is first filtrate;
S6. deionized water filter residue and volume being equaled filtrate mixes, and employing is the vacuum filtration of-70KPad in gauge pressure, and collection filtrate is eluent;
S7. first filtrate is mixed with eluent, adopt Rotary Evaporators rotary evaporation at 40 DEG C, until its volume is down to equal with sample, obtain results sample;
S8. in darkroom by described light emission mouth just to sample, make light irradiate sample, the infrared spectrum of collected specimens, the concentration of antiseptic in measurement result sample.
Further, described employing rotary shaker to bulk processing sample carry out concussion process refer to the rotating speed of 200 turns/min under 5 degrees Celsius of constant temperatures to bulk processing sample concussion 15min.
In described employing infrared spectroscopic determination results sample, the concentration of antiseptic refers to the fruit juice standards solution adopting analytically pure Sodium Benzoate preparation variable concentrations, obtains the abosrption spectrogram of the fruit juice standards solution of each concentration; Use multivariate calibration methods to set up the mathematical model of relation between antiseptic content and absorption spectrum in sample, and model is verified; Obtain the absorption spectrum of results sample, obtain the concentration of antiseptic in results sample by described calculated with mathematical model.
Described sample is that the analysis purified petroleum benzin sodium formate (commercially available prod) of fresh squeezing grape juice and variable concentrations is formulated.Its testing result is as shown in table 1.The test duration of average each sample (10mL) is 30min
Comparative example 1
This comparative example provides the detection method of concentration of preservatives in a kind of fruit juice, and its concrete steps are:
Sample is filtered, and uses deionized water rinsing filter cake, collect filtrate.Rotary Evaporators rotary evaporation at 40 DEG C is adopted to filtrate, until its volume is down to equal with sample, obtains results sample.Collect the absorption spectrum of this results sample, the calculated with mathematical model utilizing embodiment 1 to set up obtains the concentration of preservatives of results sample, and its testing result as shown in Figure 1.Described sample is that the analysis purified petroleum benzin sodium formate (commercially available prod) of fresh squeezing grape juice and variable concentrations is formulated.
Comparative example 2
This comparative example provides the detection method of concentration of preservatives in a kind of fruit juice, its concrete steps are: by the greenhouse cooling to 2 of sample DEG C, to add volume be the concentration of 3% of sample is the sodium-chloride water solution of 25mol/mL, obtain bulk processing sample sample is filtered, and use deionized water rinsing filter cake, collect filtrate.Rotary Evaporators rotary evaporation at 40 DEG C is adopted to filtrate, until its volume is down to equal with sample, obtains results sample.Collect the absorption spectrum of this results sample, the calculated with mathematical model utilizing embodiment 1 to set up obtains the concentration of preservatives of results sample, and its testing result as shown in Figure 1.Described sample is that the pure antiseptic of analysis (commercially available prod) of fresh squeezing grape juice and variable concentrations is formulated.
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.
Claims (7)
1. the portable fluid food near-infrared spectrometers based on digital light treatment technology, comprise LED light source component, reflective mirror, collector lens, blazed grating, digital micro-mirror assembly, single-photon detector, line detector and spectral information disposal system, described spectral information disposal system and described digital micro-mirror assembly, single-photon detector, line detector communicate to connect; It is characterized in that: described LED light source component comprises heat-radiating substrate, covers the wiring board on heat-radiating substrate and is installed on the multiple LED chips on wiring board; Described flexible circuit board surface coverage has reflector layer; Described reflective mirror is parabolic reflector, and described LED light source component is arranged on the focus place of parabolic reflector; Described LED light source component also comprises the collector lens be arranged on outside LED chip; Described collector lens comprises the transparent cone covered outside LED chip; Described transparent cone side wrap has light shield layer, and the height of light shield layer is lower than the height at cone top.
2. near-infrared spectrometers according to claim 1, is characterized in that: the micro mirror in described Digital Micromirror Device can ± 12 ° of rotations; Reflected light when described single-photon detector and micro mirror ﹢ 12 ° rotate is on same straight line; Described line detector and micro mirror are born 12 ° of reflected light when rotating and are on same straight line; Described single-photon detector is single photon avalanche diode detector; Described line detector is lead sulfide photodetector; The DLP4500NIR chipset that described spectral information disposal system is produced for Texas Instrument.
3. one kind adopts the method for antiseptic near infrared spectrometer Fast nondestructive evaluation fruit juice as claimed in claim 1 or 2.
4. method according to claim 3, is characterized in that: described antiseptic is benzoic acids antiseptic, specifically comprises the following steps:
S1. by the greenhouse cooling to 1 of sample-3 DEG C, the concentration of to add volume be the concentration of 1%-5% of sample to be the sodium-chloride water solution of 10-30mol/mL and volume be sample 0.5%-1% is the Graphene aqueous suspensions of 3-5mol/mL, obtains bulk processing sample;
S2. rotary shaker is adopted to carry out concussion process to bulk processing sample;
S3. the pH value of bulk processing sample is adjusted to 5.6-6.1;
S4. heat bulk processing sample, at 30-40 DEG C, insulation leaves standstill;
S5. sample is cooled to 2-5 DEG C, filters sample, collecting filtrate is first filtrate;
S6. deionized water filter residue and volume being equaled filtrate mixes, and adopts vacuum filtration, and collection filtrate is eluent;
S7. first filtrate is mixed with eluent, adopt Rotary Evaporators rotary evaporation at 30-40 DEG C, until its volume is down to equal with sample, obtain results sample;
S8. the concentration of antiseptic in described near infrared spectrometer measurement result sample is adopted.
5. method according to claim 4, is characterized in that: described employing rotary shaker to bulk processing sample carry out concussion process refer to the rotating speed of 100-300 turns/min under 5-10 degrees Celsius of constant temperatures to bulk processing sample concussion 10-25min.
6. method according to claim 5, is characterized in that: in described measurement result sample, the concentration of antiseptic refers to the fruit juice standards solution adopting analytically pure antiseptic preparation variable concentrations, obtains the abosrption spectrogram of the fruit juice standards solution of each concentration; Use multivariate calibration methods to set up the mathematical model of relation between antiseptic content and absorption spectrum in sample, and model is verified; Obtain the absorption spectrum of results sample, obtain the concentration of antiseptic in results sample by described calculated with mathematical model.
7. method according to claim 6, is characterized in that: described multivariate calibration methods is the multivariate calibration methods of Chemical Measurement.
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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 |
| CN112525854A (en) * | 2019-09-18 | 2021-03-19 | 大连兆晶生物科技有限公司 | Method for identifying components |
| CN112525853A (en) * | 2019-09-18 | 2021-03-19 | 大连兆晶生物科技有限公司 | Simple component identification method |
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