CN110487740A - Unginned cotton regain on-line measurement system and its measurement method based on Near-Infrared Absorption Method - Google Patents
Unginned cotton regain on-line measurement system and its measurement method based on Near-Infrared Absorption Method Download PDFInfo
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- 102100027340 Slit homolog 2 protein Human genes 0.000 description 2
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 2
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Abstract
Unginned cotton regain on-line measurement system based on Near-Infrared Absorption Method, the entrance slit being equipped with including infrared light supply side；Entrance slit outlet is equipped with collimation lens；The side of collimation lens is equipped with monochromatic spectroscopic instruments；The side of monochromatic spectroscopic instruments is equipped with Digital Micromirror Device DMD；The side of Digital Micromirror Device DMD is equipped with convergent lens；The side of convergent lens is equipped with optical detector；Digital Micromirror Device DMD is connected with single-chip microcontroller；Optical detector is connected by analog signal processing circuit with single-chip microcontroller；Single-chip microcontroller is connected with display；Step are as follows: infrared light supply issues Infrared irradiation unginned cotton, the infrared light sensitive to hydrone of the moisture absorption in unginned cotton, on remaining infrared light reflection to spectroscopic instruments, by the light splitting of monochromatic instrument, is irradiated on optical detector；By the calculation processing of reception, conversion and mathematical model, the regain of tested unginned cotton is shown；Have the advantages that non-contact, continuous measurement, speed are fast and with high accuracy.
Description
Technical field
The invention belongs to cottonseed cotton regain detection technique fields, and in particular to the unginned cotton regain based on Near-Infrared Absorption Method exists
Line measuring system and its measurement method, use is contactless, professional electronics detection system based on near-infrared spectrum technique principle
Realize the on-line checking of unginned cotton regain.
Background technique
Cotton regain is not only the important evidence of cotton trade clearing, or influences cotton safety storage and transportation, processing technology
An important factor for system stability and processing quality.Unginned cotton purchases the important link as Cotton industry chain, for stablizing cotton
Market ensures that market supply plays an important role.
Unginned cotton regain refers to the percentage of contained humidity and dry fiber weight in unginned cotton.In storage link, unginned cotton resurgence
The excessively high cotton temperature that can directly result in of rate is high, directly affects the color and fibre strength of cotton, or even cause cotton spontaneous combustion.Adding
The height of work link, unginned cotton regain is very crucial in embossing process.Unginned cotton regain is excessively high, not only influences wind model,
And influence clear miscellaneous and cotton roll rotation, it is possible to form agglomerate results in blockage.Damage cotton gin stops embossing process completely
Only.Unginned cotton regain is too low, and unginned cotton will be made to be adhered to metal surface, generate electrostatic in the fibre, causes mechanical blockage or shutdown.
Dried cotton may damage cotton fiber under high temperature.After drying, if the cotton of lower regain does not mention when jamming on and being packaged
Its high regain, is difficult ideal density and Bao Chong.To meet cleaning and processing needs, the control of unginned cotton regain is managed at one
It is extremely important to cotton storage, processing and bargain link in the range of thinking.
At present to the detection of regain during Cotton Production, man-hour manually hand-held formula unginned cotton resurgence instrument measures, exists
Based on manpower, error of measured data is big, measurement method not enough standardizes, the degree of automation is low；It is returned based on electrical measuring method on-line checking
There are speed compared with slow, precision is lower, is affected by temperature the problems such as big for damp rate.
The invention proposes the cotton regain online test methods based on infrared spectrum technology, are used for unginned cotton process
In regain detection, improve existing electrical measuring method and survey regain low efficiency, be affected by temperature the problems such as big.
Summary of the invention
To overcome above-mentioned the deficiencies in the prior art, the purpose of the present invention is to provide the unginned cotton regains based on Near-Infrared Absorption Method
On-line measurement system and its measurement method, using moisture to specific wavelength (to the absorbability of infrared ray in the wave-length coverage
Infrared absorption character by force) calculates unginned cotton regain by being analyzed reflected photometric sterance, then by showing
Show that module is shown, solve the precision in the measurement of existing regain it is low, it is affected by environment it is big, cannot continuous on-line measurement etc. ask
Topic；The accuracy and speed of regain detection can be effectively improved.
To achieve the above object, the technical solution adopted by the present invention is that:
Unginned cotton regain on-line measurement system based on Near-Infrared Absorption Method, includes infrared light supply, and infrared light supply side is equipped with
Entrance slit；Entrance slit outlet is equipped with collimation lens；The side of collimation lens is equipped with monochromatic spectroscopic instruments；Monochromatic spectroscopic instruments
Light emission side be equipped with Digital Micromirror Device DMD；The light emission side of Digital Micromirror Device DMD is equipped with convergent lens；Convergent lens goes out
Light side is equipped with optical detector；The input/output terminal of Digital Micromirror Device DMD6 is connected with single-chip microcontroller；The signal of optical detector exports
End is connected by analog signal processing circuit with single-chip microcontroller；Single-chip microcontroller is connected with display.
The analog signal processing circuit, including amplification, filtering limit spoke function.
The monochromatic spectroscopic instruments use Amici prism.
The Digital Micromirror Device DMD uses digitized spatial light modulator, applies microelectronics on one chip
Mechanical system MEMS technology integrates the tiny mirror of a aluminum alloy materials up to a million, realizes photoswitch using rotating mirror
Closure, plays the role of optical electivity.
A/D converter is equipped between the single-chip microcontroller and analog signal processing circuit.
Unginned cotton regain On-line Measuring Method based on Near-Infrared Absorption Method, comprising the following steps:
Step 1, the infrared light of spectral wavelength needed for covering is issued by infrared light supply, infrared light is emitted to standard through entrance slit
Straight lens become secondary color directional light after collimated collimated, irradiate unginned cotton, it is a part of right that the moisture contained in unginned cotton can absorb
The infrared light of hydrone sensitivity；
Step 2, it on the infrared light reflection to monochromatic spectroscopic instruments that irradiation unginned cotton back reflection returns, is divided through monochromatic spectroscopic instruments
After be radiated on the surface Digital Micromirror Device DMD, by control the surface Digital Micromirror Device DMD different location micro mirror overturn,
It is irradiated on optical detector after selecting the near infrared light of specific wavelength, then concentrated lens to assemble；
Step 3, it is reflected into the near infrared light on optical detector and passes through the meter of the reception of electricity system, conversion and mathematical model
It calculates processing the regain of tested unginned cotton is shown on screen.
The calculation processing of reception, the conversion and mathematical model of electricity system described in step 3, specific practice is:
The optical signal received is converted to the analog electrical signal for being proportional to input width flux, analog signal warp by optical detector
After preposition amplification, interference signal therein is removed by filtering, is then amplified again, the analog signal of amplification connects after limiting spoke
Single-chip microcontroller is connect, A/D conversion and mathematical model calculation processing are realized on single-chip microcontroller；
Mathematical modeling and calibration are carried out to measurement model, the regain of different moisture content unginned cotton is measured by traditional electrical measuring method
It is logical to establish width based on multiple regression procedure for the ratio of measurement wavelength and reference wavelength photometric sterance that value and near-infrared system measure
The mathematical relationship between ratio and regain is measured, the mathematical model of electric signal and the rate score that gets damp again is established；It is based on precision school simultaneously
Positive sample carries out the amendment of regain accuracy, if model accuracy is inadequate, increases modeling data sample size, until regain essence
Degree reaches the required precision drafted.
The measurement wavelength and reference wavelength；Its foundation determined are as follows: the vibration frequency of the O-H group in unginned cotton turns
When dynamic frequency is as the part wave frequency in infrared light, transition occurs after molecule absorption infra-red radiation, the light of wavelength at this
Just it is subsequently absorbed in the material；Absorption band according to hydrone near infrared region selects the moisture-absorbing tape at 1.94 μm quick as moisture
Feel wave band, for eliminate the influence of tested unginned cotton surface texturisation and light source fluctuation introduce again be difficult to by 1.78 μm of moisture absorption and
2.1 μm as with reference to wave band.
The regain of the tested unginned cotton, by infrared light diffuse width flux calculate regain, calculation are as follows:
When infrared ray is propagated in air, the vapor in air has absorption to infra-red radiation, and obeys bright
Primary-Beer law, vapor are determined the assimilation effect of monochromatic infra-red radiation by following formula:
P=p0 exp(-aλd) (1)
In formula, p is that infrared ray passes through the outgoing photometric sterance after absorbed layer, p0Be into absorbed layer incident light spoke it is logical
Amount, d is uniform dielectric thickness, aλIt is to absorb percentage, referred to as linear absorption coefficient or linear attenuation coefficient；Beer law refers to
Out, uniform dielectric minute cells thickness is directly proportional to the material concentration c of the medium to the absorption of monochromatic collimated beam, therefore linearly declines
Subtract coefficient and be represented by formula (2):
aλ=Kλc (2)
In formula, c is material concentration, Proportional coefficient KλFor the absorption coefficient of substance, it and the wavelength of light and the property of substance
Related, wushu (2) is brought into formula (1) formula and obtains formula (3):
P=p0exp(-Kλcd) (3)
The concept of absorbance is also commonly used in real work, absorbance is often indicated with a:
From formula (3), formula (4):
It is found that the absorbance of material and the moisture content of material are directly proportional, the photometric sterance and reference of measurement wave band are commonly used
The photometric sterance of wave band reflects output intensity and incident intensity, and then the moisture content of available tested material.
The specific wavelength is divided into measurement wavelength and reference wavelength；Measuring wavelength is 1.94 μm, and reference wavelength is 1.78 μ
M and 2.1 μm.
Tested unginned cotton after being absorbed by hydrone remaining infrared light reflection to the surface DMD, then by DMD select needed for wave
Long, concentrated lens are irradiated on optical detector after assembling.Optical detector converts optical signals to electric signal, electric signal and input
Radiant energy flux is directly proportional.Useful signal is therefrom extracted after signal processing and A/D conversion and completes signal detection, then by control and signal
Then the resurgence rate score that reason system will be exported after the electric signal after conversion by mathematical model is shown by display and is got damp again
Rate.
The mathematical model depends on the photoelectric cell of selected optical detector.When inner photoeffect occurs, current-carrying in material
Subnumber mesh increases, and materials conductive rate increases.One timing of illumination, photo resistance both ends institute's making alive and photoelectric current are linear relationship.
Thus the available width flux being irradiated on optical detector of linear relationship, obtains width flux and moisture by Lambert-Beer's law
The formula of mathematical of value.Cotton regain fields of measurement is generally using the numerical value of Oven Method measurement as regain, herein
We, which use, measures instrument online with traditional electrical measuring method regain that Oven Method was calibrated as standard.Before founding mathematical models, lead to
It crosses and chooses unginned cotton a certain number of, under varying environment humidity, first measure its moisture value using infrared moisture meter, then is electric with tradition
Survey method measurement obtains regain.The regain value and near-infrared system of different moisture content unginned cotton are measured by traditional electrical measuring method
The ratio of the measurement wavelength and reference wavelength photometric sterance that measure establishes reflected light width flux and resurgence based on multiple regression procedure
Mathematical relationship between rate, to establish the mathematical model of electric signal and the rate score that gets damp again.Simultaneously based on accuracy correction sample into
The amendment of row regain accuracy increases modeling data sample size if model accuracy is inadequate, until regain precision reaches quasi-
Fixed required precision.
The beneficial effects of the present invention are:
Compared with prior art, since the present invention uses: the infrared light width that two kinds of wavelength illumination unginned cotton back reflections of measurement return
Flux is strong and true to the weaker characteristic of the absorbability of certain wavelength according to infrared Absorption ability of the hydrone to specific wavelength
Surely wavelength and reference wavelength are measured；After being irradiated to unginned cotton sample by the complex light that radiation source issues, to anti-after hydrone absorbs
The remaining infrared light being emitted back towards carries out light-splitting processing, will be in required wavelength illumination to optical detector；It is detected and is measured by optical detector again
The exit optical radiation amount of wavelength is collected simultaneously reference wavelength outgoing photometric sterance.The optical signal conversion that optical detector is collected into
It sends control to for electric signal and after amplification and is calculated with signal processing system, to be finally inversed by the water content of sample layer；
It is achieved that in cotton processing it is non-contact, the regain on-line checking of sample is not lost, and improve detection speed
And continuity, measurement accuracy is higher, has reached the requirement of substitution traditional detection method.
Since the present invention calculates cotton regain according to mathematical model, according to Near-Infrared Absorption Method regain measuring principle, by light
The infrared width flux that two kinds of wavelength illumination unginned cotton back reflections return, electricity are collected in detector and control with signal processing system (see Fig. 1)
The electric signal for being proportional to input width flux will be generated by surveying device, therefrom extract useful signal after signal processing and A/D conversion
Signal detection is completed, Data acquisition and storage is controlled by control and signal processing system, and according to the mathematical model meter established
It calculates regain and is demarcated to improve accuracy.
The present invention is to eliminate light source variation and environment bring to influence, by designing double light path form for three wave band near-infrareds
Light is divided into six beam light.Then, according to langbobier law: measured object moisture content and outgoing photometric sterance and incident light spoke are logical
The ratio of amount measures different moisture content unginned cotton sample regain value as modeling using traditional electrical measuring method and marks number at certain relationship
According to, multivariate regression models is established between the ratio of the outgoing radiant energy flux and incident radiant energy flux that measure with corresponding modeling unginned cotton sample,
According to mathematical model and then the unginned cotton regain for measuring and measuring based on infrared system, while preparation model accuracy correction can be calculated
Unginned cotton carries out precision test.
Since the present invention sends the regain result of measurement to liquid crystal display using control and signal processing system, institute
Data are shown so that liquid crystal display can be achieved.
The present invention solves during Cotton Production that regain is easily affected by environment, precision is not high, cannot continuously measure
Technical problem has the advantages that non-contact, continuous measurement, speed are fast and with high accuracy, there is higher reliability.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention.
Fig. 2 is flow chart of the invention.
Specific embodiment
Referring to Fig.1, the unginned cotton regain on-line measurement system based on Near-Infrared Absorption Method, includes including optical system and electricity
System two parts, the optical system include infrared light supply 1, and 1 side of infrared light supply is equipped with entrance slit 2；Entrance slit 2 goes out
Mouth is equipped with；The side of collimation lens 3 is equipped with monochromatic spectroscopic instruments 5；The light emission side of monochromatic spectroscopic instruments 5 is equipped with Digital Micromirror Device
DMD6；The light emission side of Digital Micromirror Device DMD6 is equipped with convergent lens 7；The light emission side of convergent lens 7 is equipped with optical detector 8；Number
The input/output terminal of word micro mirror element DMD6 is connected with single-chip microcontroller；The signal output end of optical detector 8 passes through at analog signal
Reason circuit 11 is connected with single-chip microcontroller；The output end of single-chip microcontroller is connected with display 10.The optical detector, analog signal processing
Circuit, single-chip microcontroller, display form electricity system.
The monochromatic spectroscopic instruments 5 use Amici prism.
The Digital Micromirror Device DMD uses digitized spatial light modulator, i.e., applies micro- electricity on one chip
Sub- mechanical system MEMS technology integrates the tiny mirror of a aluminum alloy materials up to a million, realizes photoswitch using rotating mirror
Closure, play the role of optical electivity.
A/D converter 12 is equipped between the single-chip microcontroller 9 and analog signal processing circuit 11.The work of A/D converter 12
With being that turn analog signal be digital signal.
It is irradiated on collimation lens by the infrared light that light source issues through entrance slit, becomes parallel polychromatic light after collimation；It is flat
Row polychromatic light irradiates unginned cotton sample；On Infrared irradiation to Amici prism after the reflection of unginned cotton sample, after light splitting
For Infrared irradiation to the surface Digital Micromirror Device DMD, wavelength needed for the overturning by controlling Digital Micromirror Device DMD selects is infrared
Light, then be irradiated on optical detector after being assembled via convergent lens；By the reception, conversion and processing of electricity system by tested seed
The regain of cotton is shown on screen.
The optical system includes light source, entrance slit, collimation lens, convergent lens, Amici prism, digital micromirror device
Part DMD.The infrared light that light source issues is emitted to collimation lens through entrance slit, and it is parallel to become secondary color after collimated collimated
Light, the infrared light that irradiation unginned cotton back reflection goes out are radiated on the surface Digital Micromirror Device DMD after the light splitting of Amici prism, pass through
The micro mirror overturning for controlling the surface Digital Micromirror Device DMD different location, selects the near infrared light of specific wavelength to be reflected into optical detection
On device.
Unginned cotton regain On-line Measuring Method based on Near-Infrared Absorption Method, comprising the following steps:
Step 1, the infrared light of spectral wavelength needed for covering is issued by infrared light supply, infrared light is emitted to standard through entrance slit
Straight lens become secondary color directional light after collimated collimated, irradiate unginned cotton, it is a part of right that the moisture contained in unginned cotton can absorb
The infrared light of hydrone sensitivity；
Step 2, it on the infrared light reflection to monochromatic spectroscopic instruments that irradiation unginned cotton back reflection returns, is divided through monochromatic spectroscopic instruments
After be radiated on the surface Digital Micromirror Device DMD, by control the surface Digital Micromirror Device DMD different location micro mirror overturn,
It is irradiated on optical detector after selecting the near infrared light of specific wavelength, then concentrated lens to assemble；
Step 3, it is reflected into the near infrared light on optical detector and passes through the meter of the reception of electricity system, conversion and mathematical model
It calculates processing the regain of tested unginned cotton is shown on screen.
The calculation processing of reception, the conversion and mathematical model of electricity system described in step 3, specific practice is:
Firstly, the optical signal received is converted to the analog electrical signal for being proportional to input width flux, simulation by optical detector
After signal is put greatly before menstruation, interference signal therein is removed by filtering, is then amplified again, the analog signal of amplification is by limit
Single-chip microcontroller is connected after spoke.A/D conversion and mathematical model calculation processing are realized on single-chip microcontroller；
Secondly, carrying out mathematical modeling modeling and calibration to measurement model, different moisture content seed is measured by traditional electrical measuring method
The ratio of measurement wavelength and reference wavelength photometric sterance that the regain value and near-infrared system of cotton measure, is based on multiple regression side
Method establishes the mathematical relationship between width flux ratio and regain, establishes the mathematical model of electric signal and the rate score that gets damp again；Simultaneously
The amendment that regain accuracy is carried out based on accuracy correction sample increases modeling data sample size, directly if model accuracy is inadequate
Reach the required precision drafted to regain precision.
The measurement wavelength and reference wavelength；Its foundation determined are as follows: the vibration frequency of the O-H group in unginned cotton turns
When dynamic frequency is as the part wave frequency in infrared light, transition occurs after molecule absorption infra-red radiation, the light of wavelength at this
Just it is subsequently absorbed in the material；Absorption band according to hydrone near infrared region selects the moisture-absorbing tape at 1.94 μm quick as moisture
Feel wave band, for eliminate the influence of tested unginned cotton surface texturisation and light source fluctuation introduce again be difficult to by 1.78 μm of moisture absorption and
2.1 μm as with reference to wave band.
The regain of the tested unginned cotton, by infrared light diffuse width flux calculate regain, calculation are as follows:
When infrared ray is propagated in air, the vapor in air has absorption to infra-red radiation, and obeys bright
Primary-Beer law, vapor are determined the assimilation effect of monochromatic infra-red radiation by following formula:
P=p0 exp(-aλd) (1)
In formula, p is that infrared ray passes through the outgoing photometric sterance after absorbed layer, p0Be into absorbed layer incident light spoke it is logical
Amount, d is uniform dielectric thickness, aλIt is to absorb percentage, referred to as linear absorption coefficient or linear attenuation coefficient；Beer law refers to
Out, uniform dielectric minute cells thickness is directly proportional to the material concentration c of the medium to the absorption of monochromatic collimated beam, therefore linearly declines
Subtract coefficient and be represented by formula (2):
aλ=Kλc (2)
In formula, c is material concentration, Proportional coefficient KλFor the absorption coefficient of substance, it and the wavelength of light and the property of substance
Related, wushu (2) is brought into formula (1) formula and obtains formula (3):
P=p0exp(-Kλcd) (3)
The concept of absorbance is also commonly used in real work, absorbance is often indicated with a:
From formula (3), formula (4):
It is found that the absorbance of material and the moisture content of material are directly proportional, the photometric sterance and reference of measurement wave band are commonly used
The photometric sterance of wave band reflects output intensity and incident intensity, and then the moisture content of available tested material.
Unginned cotton regain on-line measurement system based on Near-Infrared Absorption Method, includes to cooperate with infrared light supply, entrance slit；
Light is irradiated on collimation lens after entrance slit；The emergent light of collimation lens is emitted onto the unginned cotton sample in sample cell；
By on the Infrared irradiation to Amici prism of sample cell；It is micro- that dispersion spectrum after Amici prism is divided is irradiated to DMD number
Mirror device surface；DMD Digital Micromirror Device is connected with control with signal processing system, the infrared light of wavelength needed for then selecting；
Optical detector is irradiated to after the required concentrated lens convergence of infrared light；Optical detector output end is connected with signal processing module；Letter
Number processing module output end is connected with A/D conversion module；A/D conversion module output end is connected with control with signal processing system,
Control is connected with signal processing system output end with display.
The electricity system includes optical detector, signal processing module, A/D conversion module, control and signal processing system
System and display；Remaining infrared light reflection is to the surface DMD after being absorbed by hydrone for tested unginned cotton, then needed for being selected as DMD
Wavelength, concentrated lens are irradiated on optical detector after assembling.Optical detector converts optical signals to electric signal, electric signal and defeated
It is directly proportional to enter radiant energy flux.Useful signal is therefrom extracted after signal processing and A/D conversion and completes signal detection, then by control and letter
The resurgence rate score that number processing system will be exported after the electric signal after conversion by mathematical model, is then shown by display
Regain.
The regain value of different moisture content unginned cotton is measured by traditional electrical measuring method and measurement wavelength that near-infrared system measures
With the ratio of reference wavelength transmitting light radiation, the number between reflected light width flux and regain is established based on multiple regression procedure
Relationship, to establish the mathematical model of electric signal and the rate score that gets damp again.It is quasi- that regain is carried out based on accuracy correction sample simultaneously
The amendment of exactness increases modeling data sample size if model accuracy is inadequate, until regain precision reaches the precision drafted and wants
It asks.
Embodiment 1:
A kind of implementation method of infrared method unginned cotton regain on-line detecting system, specific embodiment are as follows:
Measure the infrared width flux that two kinds of wavelength illumination unginned cotton back reflections return
Measuring system is reflection-type moisture measurement, and tungsten halogen lamp conduct is chosen in the requirement according near infrared spectroscopy instrument to light source
The light source of infrared radiation, tungsten halogen lamp has enough intensity and high stability in measurement spectrum area, and spectral region covering is wide.In order to disappear
Except the temperature characterisitic of filament resistance influences, power supply selects constant current drive mode.In order to cooperate the collection of near infrared spectrum, system is adopted
With photovoltaic type sensor, improve efficiency and sensitivity.
Determine measurement wavelength and reference wavelength.Hydrone has 4 absorption bands, respectively 1.19 μm in the near infrared region,
1.45 μm, 1.94 μm, 2.95 μm, by the infrared absorption spectrum of water can see 2.95 μm of moisture absorptions amount of infrared light most
It is more, but in view of the detection peak value of detector is relatively close to 1.94 μm of this wavelength bands, therefore the moisture at 1.94 μm is selected to inhale
Take-up is as moisture-sensitive wave band.It is influenced to eliminate measured object surface texturisation, temperature, color and light source fluctuation etc., improves instrument
The accuracy and stability of device, but introduce 1.94 μm it is monosymmetric be difficult to by moisture absorption 2 wavelength (1.78 μm and
2.1 μm) it is used as reference wavelength.Wavelength will be measured and reference wavelength is irradiated in the illumination to optical detector of unginned cotton back reflection, unrestrained
Reflected optical signal is converted to electric signal, the photometric sterance of measurement wave band and the photometric sterance of reference wave band is found out, with anti-
Output intensity and incident intensity are reflected, and then finds out tested material moisture content.
Monochromatic instrument is made of Amici prism and DMD.The infrared light that light source issues is collimated, and parallel complex light is irradiated
Onto unginned cotton sample, the infrared light being reflected back from unginned cotton sample after Amici prism is divided each section of spatial distribution in DMD table
Face；When the near infrared light time spectrum for needing to select specific wavelength, data processing module control DMD corresponding position surface micro mirror is all beaten
It opens and (is turned to+12 °), other micro mirrors are closed (being turned to -12 °) and realize optical electivity, it can be the spectral reflectance of needs
Onto optical detector.It is integrated with photosensitive member on optical detector, electric signal can be converted optical signal into, two kinds of wavelength can be obtained and shine
Penetrate the infrared width flux that unginned cotton back reflection returns.
2) cotton regain is calculated according to mathematical model
By controlling the resurgence surveyed from signal processing system according to traditional electrical measuring method using different regain modeling unginned cottons
The infrared method regain mathematical model that rate and Near-Infrared Absorption Method reflectance value are established, and based on correction with unginned cotton sample to model into
Row amendment calculates unginned cotton regain, and store until precision reaches requirement.
3) regain is shown
The regain result that survey calculation obtains is sent to liquid crystal display by control and signal processing system shows number
According to.
Claims (9)
1. the unginned cotton regain on-line measurement system based on Near-Infrared Absorption Method, which is characterized in that it include infrared light supply (1), it is infrared
Light source (1) side is equipped with entrance slit (2)；Entrance slit (2) outlet is equipped with collimation lens (3)；The side of collimation lens (3) is set
There are monochromatic spectroscopic instruments (5)；The light emission side of monochromatic spectroscopic instruments (5) is equipped with Digital Micromirror Device DMD (6)；Digital Micromirror Device
The light emission side of DMD (6) is equipped with convergent lens (7)；The light emission side of convergent lens (7) is equipped with optical detector (8)；Digital Micromirror Device
The input/output terminal of DMD (6) is connected with single-chip microcontroller (9)；The signal output end of optical detector (8) passes through analog signal processing circuit
(11) it is connected with single-chip microcontroller；Single-chip microcontroller is connected with display (10).
2. the unginned cotton regain on-line measurement system according to claim 1 based on Near-Infrared Absorption Method, which is characterized in that described
Monochromatic spectroscopic instruments (5) use Amici prism.
3. the implementation method of the unginned cotton regain on-line measurement system according to claim 1 based on Near-Infrared Absorption Method, special
Sign is that the Digital Micromirror Device DMD uses digitized spatial light modulator, applies microelectronics machine on one chip
Tool system MEMS technology integrates the tiny mirror of a aluminum alloy materials up to a million, realizes closing for photoswitch using rotating mirror
It closes.
4. the unginned cotton regain on-line measurement system according to claim 1 based on Near-Infrared Absorption Method, which is characterized in that described
Single-chip microcontroller (9) and analog signal processing circuit (11) between be equipped with A/D converter (12).
5. the unginned cotton regain On-line Measuring Method based on Near-Infrared Absorption Method, which comprises the following steps:
Step 1, the infrared light of spectral wavelength needed for covering is issued by infrared light supply, infrared light is emitted to collimation thoroughly through entrance slit
Mirror becomes secondary color directional light after collimated collimated, irradiates unginned cotton, and the moisture contained in unginned cotton can absorb a part to moisture
Sub sensitive infrared light；
Step 2, it on the infrared light reflection to monochromatic spectroscopic instruments that irradiation unginned cotton back reflection returns, is shone after the light splitting of monochromatic spectroscopic instruments
It penetrates on the surface Digital Micromirror Device DMD, the micro mirror by controlling the surface Digital Micromirror Device DMD different location is overturn, selection
It is irradiated on optical detector after the near infrared light of specific wavelength, then the convergence of concentrated lens；
Step 3, it is reflected at calculating of the near infrared light on optical detector by the reception of electricity system, conversion and mathematical model
The regain of tested unginned cotton is shown on screen by reason.
6. the unginned cotton regain On-line Measuring Method based on Near-Infrared Absorption Method according to claim 5, feature exist
In the calculation processing of reception, the conversion and mathematical model of electricity system described in step 3, specific practice is:
The optical signal received is converted to the analog electrical signal for being proportional to input width flux by optical detector, and analog signal is through preposition
After amplification, interference signal therein is removed by filtering, is then amplified again, the analog signal of amplification connects single after limiting spoke
Piece machine；A/D conversion and mathematical model calculation processing are realized on single-chip microcontroller；
Mathematical modeling and calibration are carried out to measurement model, by traditional electrical measuring method measure the regain value of different moisture content unginned cotton with
The ratio of measurement wavelength and reference wavelength photometric sterance that near-infrared system measures, establishes width flux ratio based on multiple regression procedure
Mathematical relationship between value and regain establishes the mathematical model of electric signal and the rate score that gets damp again；It is based on accuracy correction sample simultaneously
The amendment of this progress regain accuracy increases modeling data sample size if model accuracy is inadequate, until regain precision reaches
To the required precision drafted.
7. the unginned cotton regain On-line Measuring Method according to claim 5 based on Near-Infrared Absorption Method, which is characterized in that described
Measurement wavelength and reference wavelength；Its foundation determined are as follows: the vibration frequency or rotational frequency of the O-H group in unginned cotton and infrared
When part wave frequency in light is the same, transition occurs after molecule absorption infra-red radiation, light of wavelength is just subsequently absorbed in the material at this；
Absorption band according to hydrone near infrared region selects the moisture-absorbing tape at 1.94 μm as moisture-sensitive wave band, to eliminate
The influence of tested unginned cotton surface texturisation and light source fluctuation introduces again to be difficult to by 1.78 μm of moisture absorption and 2.1 μm as reference
Wave band.
8. the unginned cotton regain On-line Measuring Method according to claim 5 based on Near-Infrared Absorption Method, which is characterized in that described
Tested unginned cotton regain, by infrared light diffuse width flux calculate regain, calculation are as follows:
When infrared ray is propagated in air, the vapor in air has absorption to infra-red radiation, and obeys lambert-ratio
That law, vapor are determined the assimilation effect of monochromatic infra-red radiation by following formula:
P=p0exp(-aλd) (1)
In formula, p is that infrared ray passes through the outgoing photometric sterance after absorbed layer, p0It is the incident photometric sterance into absorbed layer, d is
Uniform dielectric thickness, aλIt is to absorb percentage, referred to as linear absorption coefficient or linear attenuation coefficient；Beer law points out, uniformly
Medium minute cells thickness is directly proportional to the material concentration c of the medium to the absorption of monochromatic collimated beam, therefore linear attenuation coefficient
It is represented by formula (2):
aλ=Kλc (2)
In formula, c is material concentration, Proportional coefficient KλFor the absorption coefficient of substance, it is related with the property of the wavelength of light and substance,
Wushu (2) is brought into formula (1) formula and obtains formula (3):
P=p0exp(-Kλcd) (3)
The concept of absorbance is also commonly used in real work, absorbance is often indicated with a:
From formula (3), formula (4):
It is found that the absorbance of material and the moisture content of material are directly proportional, the photometric sterance and reference wave band of measurement wave band are commonly used
Photometric sterance reflect output intensity and incident intensity, and then the moisture content of available tested material.
9. the unginned cotton regain On-line Measuring Method according to claim 5 based on Near-Infrared Absorption Method, which is characterized in that described
Specific wavelength be divided into measurement wavelength and reference wavelength, measurement wavelength is 1.94 μm, and reference wavelength is 1.78 μm and 2.1 μm.
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