CN101532958B - Method and system for measuring dry rubber content in concentrated latex based on photoelectric sensor - Google Patents
Method and system for measuring dry rubber content in concentrated latex based on photoelectric sensor Download PDFInfo
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- CN101532958B CN101532958B CN 200910031158 CN200910031158A CN101532958B CN 101532958 B CN101532958 B CN 101532958B CN 200910031158 CN200910031158 CN 200910031158 CN 200910031158 A CN200910031158 A CN 200910031158A CN 101532958 B CN101532958 B CN 101532958B
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Abstract
The invention discloses a method and a system for measuring dry rubber content in a concentrated latex based on a photoelectric sensor, which are on the basis of photoelectric sensing technology, and relates to a physical structure of the photoelectric sensor, a processing flow of measured data of the dry rubber content in the concentrated latex and the whole system measurement stability. LEDs and photodiodes which are distributed in an annular mode are used as an in-out signal source of the photoelectric sensor; a liftable object table adjusts the measurement optical distance, and a multiple linear regression analysis method is adopted to process the measured data at the same time; and one path of reference signals are added to eliminate the influence of temperature drift on the system measurement stability. The method for measuring the dry rubber content in the concentrated latex based on the photoelectric sensor has the advantages of simple operation, rapid measurement, small system volume and convenient carrying.
Description
One, technical field
Of the present invention based on dry rubber content measuring method and system in the concentrated latex of photoelectric sensor, it is based on photoelectric sense technology, the physical arrangement that relates to a kind of photoelectric sensor, the Measurement and Data Processing flow process of dry rubber content and total system measurement stability in the concentrated latex, wherein, used the LED of annular distribution mode and photodiode input/output signal source as photoelectric sensor, regulate the distance of illuminant module and sample room by the liftable objective table, adopt multi-element linear regression method to handle measurement data simultaneously, and increase by one tunnel reference signal and be used for eliminating temperature and float influence systematic survey stability.
Two, background technology
Natural rubber is a kind of essential industry raw material, and it extracts from contain the glue plant, and rubber and iron and steel, oil and coal are known as the four big raw materials of industry.Natural rubber is owing to have many superior character, so the demand in market is big, and as renewable resource, concentrated latex has sizable ecological dominance compared with the synthetic rubber that with the oil is raw material.In recent years, because global environmental protection policy makes the demand of natural rubber further rise significantly, cause the surge of price, and the dry rubber content in the elastomer latex is the key factor of decision rubber price.
In the measurement of dry rubber content, adopt the standard chemical analytical approach usually in realizing concentrated latex, ultimate principle is that the concentrated latex test portion is diluted to total solids content is 20%, and uses the acetate acidifying.The rubber that will solidify is pressed into thin slice then, and is dry under 70 ℃, carries out weighing at last and calculate.
In addition, also adopt some indirect methods of measurement, use based on the measuring method of microwave technology with based on the measuring method of capacitance type sensor.Microwave measuring method mainly is to measure microwave by the latex attenuation degree, utilizes the survey glue instrument of technology developments such as high precision step motor drive, computer controlled automatic, signal Processing, electronic liquid crystal demonstration.The capacitance type sensor measuring technique is mainly utilized the capacitance measurement technology, and ultimate principle is the capacity direct ratio and the pole plate area of electric capacity, the specific inductive capacity of medium, the distance between inverse ratio and the pole plate.If the distance between pole plate area and the pole plate remains unchanged, then capacitance is proportional to the specific inductive capacity of medium, studies the concentration character of measured matter by measuring capacitance.
In above-mentioned concentrated latex in the dry rubber content standard chemical mensuration, the operation that the whole operation process need is very careful, and each details operation must carry out according to corresponding national standards, not only time-consuming but also effort.If twice replicate determination result surpasses 0.1% of average, just need redeterminate.Although this method is more perfect theoretically, similar standard ISO 126:2005 is also arranged in the world, but its measuring equipment heaviness, measuring period is long, simultaneously again for loss measurement is arranged, the measuring operation trouble, wherein system equipment such as analytical balance and constant temperature oven cost an arm and a leg, and also need a skilled staff to use these instruments simultaneously.
Same, dry rubber content microwave measurement system in above-mentioned concentrated latex, its fancy price make some small-sized Jiao Chang, research institute, produce plantation prestige and living, and the maintenance requirement height needs periodic maintenance, and reason is after its calibration curve uses the long period (1-2), each parameter can change, this will cause the calibration curve shape, the variation of width amplitude, thus cause testing process to produce than mistake.Adjust scaling point in any case, all calibration curve can't be returned to normal place.Thereby calibration curve must be measured again, could guarantee the accuracy of testing result, and its calibration curve calibration is a more complicated simultaneously.And the capacitive transducer mensuration does not reach commercial standard (CS) also still in the middle of laboratory study as yet.
In recent years, the high speed development of laser technology and spectral analysis technique makes Infrared Spectrum Technology etc. be applied in widely in the research of dry rubber content measuring system in the latex, wherein Lian Jia LED makes system source needn't go to adopt the heavy conventional white light light emitting source and the combination of optical splitter (grating or AOFT) but to have the output signal of degree of precision in the same old way, is applicable to the also integrated marketization of high performance amplifier of illuminant module photo-signal amplification simultaneously.The present invention proposes to utilize spectrophotometry based on dry rubber content measuring method and system in the concentrated latex of photoelectric sensor, adopts the photoelectric sensor of annular distribution mode, only needs that sample is put into the liftable objective table and can obtain the dry rubber content measured value.This measuring method is compared with normally used standard chemical analysis measurement method, at measuring speed, and measuring operation, therefore equipment price and safeguard that the aspect all gets along with can realize dry rubber content in the cheap portable quick measurement concentrated latex very much.
Three, summary of the invention
First problem that the present invention will solve is a kind of high-precision photoelectric sensor of design; Second problem is the supporting hardware circuit of design, wherein most importantly designs outstanding photocurrent pre-amplifying module circuit and comes little current signal is amplified and designs secondary and go temperature to float the amplification module circuit to reduce the influence of temperature variation to systematic survey; The 3rd problem is that the design data treatment scheme realizes the processing to special signal, and the signal that is obtained is carried out the effective value screening, ordering and average processing etc., and then by standard equation calculating dry rubber content value.
In order to reach above-mentioned goal of the invention, technical scheme of the present invention is based on dry rubber content measuring method and system in the concentrated latex of photoelectric sensor.Provided by the invention based on dry rubber content measuring method in the concentrated latex of photoelectric sensor, comprise the following steps:
First step: dry rubber content signals collecting step in the concentrated latex, based on photoelectric sense technology, select the light emitting module of a plurality of different wave lengths and signal generator and the receiver that illuminant module constitutes photoelectric sensor for use, select for use lens as the optical device that converges in the optical system simultaneously, the emergent light of light emitting module incides the latex surface at a certain angle, part light after the scattering process of latex inner material from the outgoing of latex surface, the emergent light that converges by optical system is carried out opto-electronic conversion, and the acquisition photo-signal, specifically comprise the following steps one to step 3:
Step 1: the LED that adopts a plurality of different wave lengths is as light emitting source, LED is evenly distributed in a circumference, constitute the light emitting module of ring-like LED as photoelectric sensor, each LED shines latex surface on the liftable objective table with equal angular, and the circular printing opacity rotating disk of a perforate is fixed in the light emitting module periphery, have only the light of a LED to incide the latex surface when making each the measurement, adopt photodiode as illuminant module, be fixed on the circle centre position of light emitting module, and with the latex Surface Vertical;
Step 2: select short focal length lens for use, make the emergent light on latex surface converge to illuminant module, wherein said photodiode work is under photovoltaic mode;
Step 3: signal processing module is controlled the position of described printing opacity rotating disk automatically, for a certain wavelength LED printing opacity in the light emitting module, thereby synchronous signal processing module control step motor is regulated the distance between sample and the illuminant module, makes illuminant module output photocurrent reach maximum;
Second step: the amplification of signal and switch process, adopt the two-stage amplifying circuit to amplify photo-signal, specifically comprise the following steps 1 to step 3:
Step 1: photo-signal is amplified and convert voltage signal to by the photo-signal pre-amplifying module;
Step 2: increase by one tunnel reference signal and measure, and with the sealing of the photoelectric sensor in this road of reference signal, its two paths of signals is measured by the signal processing module synchro control;
Step 3: go temperature to float amplification module by secondary measuring-signal and reference signal are carried out the difference amplification and be transported to the signal conversion module that is in continuous translative mode;
Step 4: certain wavelength LED emergent light sees through described printing opacity rotating disk and incides the latex surface, after the signal processing module tracer signal modular converter output data, the printing opacity rotating disk is rotated in control again, for another wavelength LED printing opacity in the light emitting module, repeat the step 4 in step 3 to the second step in the first step, up to finishing the latex surface emergent light of measuring all wavelengths LED;
Third step: the dry rubber content scaling step, the digital signal of signal converter output is relevant with the dry rubber content in the latex, and the reflectivity difference of the latex of different dry rubber contents becomes big rule according to dry rubber content rising reflectivity and calculates dry rubber content; Comprise the following steps that specifically A is to step B:
Steps A: dispose the concentrated latex sample of different concentration known,,, write down the signal conversion module output valve of different wave length LED correspondence successively for the concentrated latex sample of each concentration according to the measuring process of step 3 to step 4;
Step B: measurement data is carried out regretional analysis, and set up regression equation, be written into standard equation in the signal processing module flow chart of data processing;
The 4th step: measure unknown dry rubber content sample, signal processing module calculates the standard equation that signal converter output valve substitution step B obtains, and promptly knows dry rubber content in this measuring samples.
Provided by the invention based on dry rubber content measuring system in the concentrated latex of photoelectric sensor, its system forms as shown in Figure 1, and system is made up of photoelectric sensor 100 and measuring system main body 150, specifically comprises following modules:
Printing opacity turntable module 103 is used for the selection of different wave length light signal is seen through, and its physical arrangement is circular, and a hole is only opened on the surface, makes to make a LED printing opacity at every turn.The printing opacity rotating disk is rotated by Electric Machine Control, and be divided into 4 gears and rotate, the corresponding LED of each gear, the control messages that motor sends according to processor is carried out gear and is rotated.
Liftable objective table 105 is used to regulate the distance between sample and the illuminant module, is made up of high precision stepper motor and mechanical module.
Photo-signal pre-amplifying module 110, be used to amplify photo-signal and current signal is converted to voltage signal, core as the measuring system main body, this module is based on little electric current amplification principle and high precision, and ICL 7650 amplifiers of high-gain realize the amplification conversion of faint optical signal.Here, describe to light signal high precision amplification principle and based on little current amplification circuit of ICL 7650 amplifiers.
Little electric current amplification principle as shown in Figure 3.Be infinitely-great ideal operational amplifier, output voltage V for input impedance and enlargement factor
0=-I
S* R
f, I wherein
SBe tested electric current, R
fIt is feedback resistance.In theory, as long as R
fObtain enough greatly, even electric current I
sVery little, also can obtain bigger output voltage V
0For example, R
f=10
10Ω, I
S=10
-11A, then V
0=-I
S* R
f=0.1V.In fact, amplifier input impedance is not infinitely great, feedback resistance R
fIncrease to be subjected to the restriction of amplifier input impedance.Consider bias current I
BTo measured current I
SShunting, V then
0=-(I
S-I
B) * R
fIf, I
BGreater than I
S, I then
SCan't measure.The primary factor that influences micro current amplification sensitivity is amplifier bias current I
B, secondly be noise voltage and zero point drift.
Should be noted that and will realize micro current that amplifier must satisfy: 1. input impedance R " feedback resistance R
f2. bias current I
B＜measured current I
S3. offset voltage and drift about little; 4. gain and common-mode rejection ratio height; 5. noise is little.
ICL 7650 adopts the integrated chopper-zero-stabilized high-operational amplifier of CMOS technology, satisfies the requirement of above-mentioned amplifier.Based on the little current amplification circuit of ICL7650 as shown in Figure 4, R
1Be ICL7650 input current-limiting protection resistance, R
3With C
2Be used for the copped wave spike noise of elimination ICL7650, C
1With R
2Form the feedback compensation network, reduce bandwidth, prevent R
2, R
3, R
4And C
2Phase shift produces self-sustained oscillation.Small resistor R
2, R
3With R
4, form T type network and replace high resistant R among Fig. 1
T(greater than 10
9Ω),, reduce noise, at this moment output voltage V to improve the stability and the precision of gain
0=-I
S* (R
2+ R
4+ R
2* R
4/ R
3).
Secondary goes temperature to float amplification module 111, and being used to reduce temperature variation influences systematic survey, also is used for the amplification once more of voltage signal simultaneously.Increase by one tunnel reference signal, preposition measurement by magnification module of its photo-signal and photoelectric sensor and measuring-signal road are just the same, different is that photoelectric sensor is the standard reflection sample in the reference signal, the liftable objective table, optical system, the printing opacity rotating disk, illuminant module and light emitting module are in sealing state, reduce extraneous other factor affecting except that the temperature variation factor.Go temperature to float amplification module by secondary the output of two-way photo-signal pre-amplification circuit and carry out difference and amplify, like this for the amplifier performance drift that causes by temperature variation, intensity of light source fluctuation, and variations such as resistance can be through doing difference output elimination.The amplifier that secondary goes temperature to float in the amplification module also is to adopt ICL 7650 amplifiers, enlargement factor is 2, change feedback resistance value, can change enlargement factor, in fact go temperature to float to amplify be The assistant amplification effect to secondary, key is to reduce warm influence of floating systematic survey, and the actual amplification of total system circuit is mainly finished by the photo-signal pre-amplifying module.
Data disaply moudle 115 adopts two seven segment digital tubes as display, based on showing positive the connection with static altogether, is used to show the data of measuring gained.When the radix point of units sign indicating number pipe is lighted, mean that shown data will add 0.5, otherwise then do not need to add.
The general processor AT89C52 that data processor 505 adopts in 8051 series in the hardware components, the user can have 256 bytes with RAM.As shown in Figure 5, processor 505P1 mouth links to each other with data bit sign mouth with the data port of MC14433.The mode that obtains data adopts query method, when MC14433 converts data, a hopping edge can appear in its EOC end, and this hopping edge can be monitored by processor fully, and processor 505P0 mouth and P2 mouth are responsible for the transmission of motor-driven 509 control messages of the motor-driven 508 of liftable objective table and printing opacity rotating disk.When measuring samples, after processor is finished the data of obtaining the output of the MC14433 word bit dynamic scan binary-coded decimal way of output, calculate dry rubber content in the sample by survey data substitution standard equation, deposit data memory Intel 6116 chips 502 in by P3, and transfer data to shift register 503 and 504 in the serial communication mode, realize that the static state of LED506 and LED507 shows measurement data.
Flow chart of data processing is divided into two parts as shown in Figure 6, and a part is A/D converter sampled data and the preprocessed data that reads in the signal conversion module; Another part is that measured data substitution standard equation is calculated, and determines institute's test sample product dry rubber content.
In first design, consider and measure required time and external environment factors vary, so the A/D converter sampling number in the signal conversion module takes to dynamically arrange, promptly the A/D converter sampling number is set according to the actual measurement ambient conditions.If external environment each side factor is more stable, N can be set
1=16, N
2=1～3, N promptly samples
2* 16 times.Such as N
2=2, be actually single-chip microcomputer and read 16 sampled values of A/D converter earlier, and 16 data are carried out the validity screening, its screening rule is to the ordering earlier of 16 data, 10 data in the middle of getting.Afterwards, at P that these 16 data of centre are averaged
1From newly reading 16 sampled values of A/D converter again, average after also screening, obtain P
2In fact, N
2Value what are, what average value P are just arranged
N2, N
2=1,2,3 ..., at last again to this N
2Individual average value P
N2Average, obtain an A/D sample mean Q under certain wavelength
1Adjust the printing opacity rotating disk, repeat above-mentioned steps, obtain four measurement data Q under the different wave length
N3, N
3=1～4, hereto, the raw data of a sample is measured and is finished.Above-mentioned way is done and can effectively be reduced because the sudden error that measuring error that this surface instability of latex causes and extraneous factor cause etc.Certainly, N
2The value that is provided with is too big, and the mass data sampling will expend the more time, therefore according to comprehensive condition suitable value is set, and is traditionally arranged to be 1～3.
In the second portion design, the standard model of each concentration of configuration carries out multiple linear regression analysis by the mass data that standard model is measured in the calibration experiment, determines regression equation Y=A
0+ A
1* Q
1+ A
2* Q
2+ A
3* Q
3+ A
4* Q
4Coefficient, i.e. A
i, i=0～4.In the calibration experiment, Q
iValue is manually to calculate by the output voltage that goes temperature to float amplifying circuit to secondary, is V if secondary goes temperature to float the amplifying circuit output voltage, then this Q
i=V/2.000*1999.After determining equation coefficient, when measuring the dry rubber content unknown sample, processor is surveyed Q with institute
iValue substitution equation promptly know dry rubber content Y value.
Here, to the method for building up of standard equation, multiple linear regression data processing and the light source by some different wave lengths replace the foundation of white light source and optical splitter to describe.
The spectrographic method great majority are that sample is carried out all band spectral scan, and spectroscopic data also comprise the not invalid information of load sample character, and often the latter is more comprising the useful information of load sample character.If all spectroscopic datas are participated in the modeling equation, not only model is huge, and computing power requires high, and the actual effect that obtains neither be very desirable.Therefore, in fact often carry out spectroscopic data and reject operation, make that the variable that enters model is minimum as far as possible.Can reject invalid data by the Return Law progressively etc., and stay the measured value that variable in the equation is generally sample characteristic reflection wavelength correspondence at last.The model measurement better effects if set up than all band measurement data to a certain extent of led light source by the some different wave lengths simplified model that replaces white light and optical splitter to set up like this, its data processing speed and system bulk are also faster littler certainly.
The dry rubber content ratio is relevant with its overall light reflectivity in the concentrated latex.The spectral distribution of research measured matter determines that the several features wavelength as photoelectric sensor light emitting module wavelength, measures a plurality of standard models, sets up equation of linear regression according to the gained data.By the corresponding light intensity value of each dry rubber content of Equation for Calculating, such data processing method makes does not need full wave light source and optical splitter on the hardware, and system bulk significantly reduces.
Systemic resolution is 1%, the fraction part of systematic survey data is not have practical significance in theory, because the Cmin of the standard model data of calibration usefulness is spaced apart 1%, therefore for measurement data mixed decimal as a result, Y rounds to measurement data, and put the decimal zone bit, think that without exception fraction part is 0.5%, like this outcome measurement error minimum of Chu Liing.If the institute data of surveying than 15% also little, with regard to the demonstration " lower limit outrange " mark; If institute's data of surveying are than 45% also greatly, with regard to demonstration " upper limit outrange " mark.Such as the survey data Y between 15%～45%, then show the data Y of surveying, and storage.
Four, description of drawings:
The block diagram of Fig. 1 system of the present invention;
The structural drawing of photoelectric sensor in Fig. 2 system of the present invention;
The little electric current amplification principle synoptic diagram that adopts in Fig. 3 system of the present invention;
The little electric current amplification principle synoptic diagram that adopts in Fig. 4 system of the present invention based on ICL 7650;
The signal processing module hardware circuit synoptic diagram that adopts in Fig. 5 system of the present invention;
Flow chart of data processing figure in the processor of Fig. 6 system of the present invention;
Symbol description among the figure:
100 photoelectric sensors, 101 illuminant modules, 102 light emitting modules
103 printing opacity rotating disks, 104 optical systems, 105 liftable objective tables
109 samples, 110 photo-signal pre-amplifying modules
110 secondarys go temperature to float amplification module 112 signal conversion module 113 signal processing modules
114 data memory modules, 115 data disaply moudles, 150 measuring system main bodys
301 constant current source 501MC14433 502Intel 6116
503 shift registers, 2 504 shift registers, 1 505 processors
506LED2 507LED1
508 liftable objective table motor-driven, 509 printing opacity rotary tray motors drive
Five, embodiment:
Examples of implementation: be measured as example with dry rubber content in the common concentrated latex, needed to calibrate earlier before measuring the unknown concentration sample, scale operation is very simple, only needs once calibration to get final product certainly within the specific limits, just can directly measure later.Configuration standard concentration sample, minimum dry rubber content concentration is 15%, high level cadre's glue content concn is 45%, at interval 1%.The experimental situation temperature is 15 degrees centigrade.The enlargement factor of light signal pre-amplification circuit is 1M, and the difference enlargement factor that secondary goes temperature to float amplifying circuit is 2.N in the flow chart of data processing is set
1=16, N
2=2, N
3=4.
Shown in Fig. 1 system chart, when tested standard model is placed on the liftable objective table 105, light emitting module 102 sends 4 light signals, one of them light signal sees through printing opacity rotating disk 103 and incides latex, and with its material surface and internal action after from the outgoing of latex surface, converge to illuminant module 101 by optical system 104, and then the output photo-signal arrives measuring system main body 150, signal processing module 113 responses have testing sample, and beginning is passed through the distance that liftable objective table 105 is regulated between sample 109 and the illuminant module 101 according to the illuminant module output signal size that obtains.This is a cyclic process, up to output photocurrent maximum, stops the adjusting of liftable objective table 105.Similarly, write down this time measurement data after, signal processing module 113 sends control messages to printing opacity dial rotation motor 509, rotate the printing opacity gear, the light signal incident of another wavelength LED so repeats said process, finishes up to the measurement data record of 4 wavelength LED light signals.In calibration process, need measure secondary with multimeter and go temperature to float amplification module 111 output voltages, and according to formula Q
i=V/2.000*1999 calculates many group Q
iData, regression equation then can be set up by the standard model measurement data, as Y=-415.43+96.913*Q in i=1～4
1+ 86.391*Q
2++ 270*Q
3+ 199.348*Q
4,, and be written into standard equation in the flow chart of data processing in the processor.
So far, when measuring the unknown concentration sample, sample need only be placed on the liftable objective table 105, start-up system, processor is Q with the four measuring data of sample
1, Q
2, Q
3, Q
4Calculate the dry rubber content value of surveying in the value substitution standard equation.Disposing a dry rubber content is 33% sample, be placed on the liftable objective table 105, start measuring system, can show measurement result after several seconds, ten LED are shown as " 3 ", and individual position LED is shown as " 2 ", and its radix point is in illuminating state, therefore the dry rubber content of surveying is 32.5% as can be known, and its measuring accuracy still is higher.Based on dry rubber content measuring method and system in the concentrated latex of photoelectric sensor, it is simple to operate, and system cost is low, and volume is little, and is in light weight, and the measuring accuracy height is applicable to portable type measuring.Adopt led light source simultaneously, system low in energy consumption, endurance is strong.
Claims (5)
1. based on dry rubber content measuring method in the concentrated latex of photoelectric sensor, it is characterized in that, comprise the following steps: first step: dry rubber content signals collecting step in the concentrated latex, based on photoelectric sense technology, select the light emitting module of a plurality of different wave lengths and signal generator and the receiver that illuminant module constitutes photoelectric sensor for use, select for use lens as the optical device that converges in the optical system simultaneously, the emergent light of light emitting module incides the latex surface at a certain angle, part light after the scattering process of latex inner material from the outgoing of latex surface, the emergent light that converges by optical system is carried out opto-electronic conversion, and the acquisition photo-signal, specifically comprise the following steps one to step 3:
Step 1: the LED that adopts a plurality of different wave lengths is as light emitting source, LED is evenly distributed in a circumference, constitute the light emitting module of ring-like LED as photoelectric sensor, each LED shines latex surface on the liftable objective table with equal angular, and the circular printing opacity rotating disk of a perforate is fixed in the light emitting module periphery, have only the light of a LED to incide the latex surface when making each the measurement, adopt photodiode as illuminant module, be fixed on the circle centre position of light emitting module, and with the latex Surface Vertical;
Step 2: select short focal length lens for use, make the emergent light on latex surface converge to illuminant module, wherein said photodiode work is under photovoltaic mode;
Step 3: signal processing module is controlled the position of described printing opacity rotating disk automatically, for a certain wavelength LED printing opacity in the light emitting module, thereby synchronous signal processing module control step motor is regulated the distance between sample and the illuminant module, makes illuminant module output photocurrent reach maximum;
Second step: the amplification of signal and switch process, adopt the two-stage amplifying circuit to amplify photo-signal, specifically comprise the following steps 1 to step 4:
Step 1: photo-signal is amplified and convert voltage signal to by the photo-signal pre-amplifying module;
Step 2: increase by one tunnel reference signal and measure, and with the sealing of the photoelectric sensor in this road of reference signal, its two paths of signals is measured by the signal processing module synchro control;
Step 3: go temperature to float amplification module by secondary measuring-signal and reference signal are carried out the difference amplification and be transported to the signal conversion module that is in continuous translative mode;
Step 4: certain wavelength LED emergent light sees through described printing opacity rotating disk and incides the latex surface, after the signal processing module tracer signal modular converter output data, the printing opacity rotating disk is rotated in control again, for another wavelength LED printing opacity in the light emitting module, repeat the step 4 in step 3 to the second step in the first step, up to finishing the latex surface emergent light of measuring all wavelengths LED;
Third step: the dry rubber content scaling step, the digital signal of signal converter output is relevant with the dry rubber content in the latex, and the reflectivity difference of the latex of different dry rubber contents becomes big rule according to dry rubber content rising reflectivity and calculates dry rubber content; Comprise the following steps that specifically A is to step B:
Steps A: dispose the concentrated latex sample of different concentration known,,, write down the signal conversion module output valve of different wave length LED correspondence successively for the concentrated latex sample of each concentration according to the measuring process of step 3 to step 4;
Step B: measurement data is carried out regretional analysis, and set up regression equation, be written into standard equation in the signal processing module flow chart of data processing;
The 4th step: measure unknown dry rubber content sample, signal processing module calculates the standard equation that signal converter output valve substitution step B obtains, and promptly knows dry rubber content in this measuring samples.
2. according to claim 1 based on dry rubber content measuring method in the concentrated latex of photoelectric sensor, it is characterized in that, light emitting module adopts 4 wavelength to be respectively 1300nm in the described photoelectric sensor, 1200nm, 1070nm, the near-infrared LED of 850nm, illuminant module adopts photodiode, the incident angle of 4 LED all is 15 degree, and photodiode and latex Surface Vertical.
3. according to claim 1 based on dry rubber content measuring method in the concentrated latex of photoelectric sensor, it is characterized in that, described photocurrent pre-amplifying module adopts little electric current amplification principle, and secondary goes temperature to float amplification module to adopt the two paths of signals difference to amplify to eliminate temperature and float.
4. based on dry rubber content measuring system in the concentrated latex of photoelectric sensor, comprise following modules:
A) light emitting module is used to produce different single wavelength light signals, and the light that sends is converged to the latex surface; It is center of circle distribution mode circlewise that its physical location adopts with the illuminant module, the neat illuminant module periphery that is looped around, this annular distribution mode makes the light emitting module of different wave length and the relation of the position between the illuminant module have identity property, and the light outgoing that the printing opacity rotating disk assurance of one deck has only certain wavelength LED to send at every turn outside the light emitting module;
B) illuminant module is used to accept light signal, and is used for light signal is transformed into current signal;
C) printing opacity turntable module, this printing opacity turntable module be by motor-driven, and be connected to signal processing module, is used for the selection of different wave length light signal is seen through;
D) Optical system module, this Optical system module is made of lens, is used to converge concentrated latex surface emergent light;
E) liftable objective table module, this liftable objective table module be by step motor drive, and be connected to signal processing module, is used to regulate the distance between sample and the illuminant module;
F) photo-signal pre-amplifying module is used to amplify photo-signal and current signal is converted to voltage signal;
G) secondary goes temperature to float amplification module, and being used to reduce temperature variation influences systematic survey, also is used for the amplification of voltage signal simultaneously;
H) signal conversion module is used for transferring the analog voltage signal of output to digital signal, and the conversion parameter of signal conversion module is by the signal processing module setting;
I) data memory module is used for storage of measurement data;
J) data disaply moudle adopts sun connection altogether and the static LED that shows as display, is used to show the data of measuring gained;
K) signal processing module, be used to control printing opacity turntable module and liftable objective table module, promptly change Stepping Motor Control message and regulate distance between liftable objective table and the illuminant module, detect the rotation that the DATA REASONING complement mark is controlled the printing opacity rotating disk simultaneously according to gained illuminant module output signal size; Be used for setting, promptly according to the conversion parameter in the actual measurement environment conditioning signal modular converter to the signal converter conversion parameter; And be used for flow chart of data processing to the processing of measurement data and control data memory module and data disaply moudle storage with show measurement result, sampling parameter N1 and N2 promptly are set, the ordering sampled data is also screened wherein partial data and is averaged, to the Q1 that is surveyed, Q2, Q3, Q4 combined standard Equation for Calculating Y value, and then to Y round and show measured value and the storage data.
5. according to claim 4 based on dry rubber content measuring system in the concentrated latex of photoelectric sensor, it is characterized in that, standard equation in the described flow chart of data processing, be based on the master pattern equation of the dry rubber content sample that scaling method and multi-element linear regression method in advance set up, by Equation for Calculating institute test sample product dry rubber content value, and can revise equation coefficient according to the actual measurement effect.
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| CN102519897B (en) * | 2011-12-13 | 2013-11-20 | 江苏大学 | Water quality COD detection method and apparatus based on LED multi-feature wavelength |
| CN104730035A (en) * | 2015-03-06 | 2015-06-24 | 南京航空航天大学 | System for measuring main component content of emulsion and detection method thereof |
| CN107576635B (en) * | 2017-08-30 | 2024-04-12 | 南京航空航天大学 | Transparent liquid concentration measuring method and system based on reflection type optical fiber system |
| DE102018114162B4 (en) * | 2018-06-13 | 2023-01-19 | Solarius Asia Ltd. | Perforated disc for selecting light for optical imaging, optical imaging system |
| CN109187374A (en) * | 2018-07-09 | 2019-01-11 | 四川大学 | A kind of device measuring strength of fluid and pH value using photoelectric sensor |
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| CN1672628A (en) * | 2005-04-29 | 2005-09-28 | 天津大学 | Dynamic spectrometry instrument with multiple wavelength LED |
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| US6628379B1 (en) * | 1998-09-30 | 2003-09-30 | Daiko Seiko Ltd. | Method and apparatus for inspection of rubber product |
| CN1672628A (en) * | 2005-04-29 | 2005-09-28 | 天津大学 | Dynamic spectrometry instrument with multiple wavelength LED |
| CN101354240A (en) * | 2008-07-15 | 2009-01-28 | 南京航空航天大学 | Micro nano-scale fiber high precision measuring system based on micro-optical |
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