CN204439543U - The main component content measuring system of a kind of emulsion - Google Patents
The main component content measuring system of a kind of emulsion Download PDFInfo
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- CN204439543U CN204439543U CN201520131672.6U CN201520131672U CN204439543U CN 204439543 U CN204439543 U CN 204439543U CN 201520131672 U CN201520131672 U CN 201520131672U CN 204439543 U CN204439543 U CN 204439543U
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Abstract
The utility model discloses the main component content measuring system of a kind of emulsion, employ near-infrared LED and the input/output signal source of the photodiode matched as photoelectric sensor, use W-type fiber as NOT-function type sensor, regulated the distance of fibre-optical probe and sample room by liftable objective table, and use thermostat to keep the temperature constant of sample; Measuring method adopts linear regression analysis manipulate measurement data, and increases the impact that a road reference signal is used for eliminating the outer bound pair systematic survey stability such as temperature drift.Not only integrated level is high for measuring system, consumption sample size is few, and is a kind of non-destructive measuring method; Measuring method also achieves the real-time display to measurement result, is highly suitable for the Measurement and analysis of the main component content of emulsion.
Description
Technical field
The utility model relates to the main component content measuring system of a kind of emulsion and detection method thereof, belongs to liquid ingredient analysis technical field.
Background technology
Dispersed liquid (disperse phase) is scattered in another continuous print liquid medium (dispersion medium) with the form of little liquid pearl, and this kind of liquid is scattered in little liquid pearl form the thermodynamic unstable system formed in the another kind of liquid not miscible with it and is called emulsion.The disperse phase diameter of emulsion is generally 0.1-10 μm, and from the particle diameter range of emulsion, most of emulsion belongs to coarse dispersion system.Typical food emulsions comprises milk, goat milk, soya-bean milk and mayonnaise etc., and the main component content in these emulsions is related to the health of the mankind; Industrial emulsion comprises natural emulsion, latex paint etc., and the major component content of these emulsions then concerns their quality and the height of price.Therefore, in order to promote security and the fairness in market, study the effective ways that in a kind of emulsion, main component content is measured significant.
For the measurement of composition main in emulsion, be mainly divided into chemical analysis method and indirect analysis method.What sea condition inquires into by contrast and orthogonal experiment the principal element impact that acid-hydrolysis method measures soymilk powder fat, and the soybean milk powder fatty consistency result obtained is better.Li Jin just waits people to adopt acid-hydrolysis method, improvement acid-hydrolysis method and alkaline ethanol extraction method three kinds of diverse ways to measure respectively to the fat content in soya-bean milk, and the result precision that result display alkaline ethanol extraction method obtains is good, and accuracy is high.The people such as Zhuo Haihua improve Robse-Gottied method, and for the mensuration of fat in coconut milk, analysis time is short, and reagent dosage is less, and analysis result is accurate.But these above-mentioned chemical analysis methods have, and workload is large, contaminated samples, and the shortcoming such as measuring speed is slow.The people such as Gustavsson, by adopting the coefficient of thermal conductivity of transient state planar inductive commercial measurement milk, can complete the measurement to butterfat content in 1 second.The people such as Xin utilize laser loose thoroughly than original, measure the Oil content and Protein content in milk by the measuring system of designed, designed simultaneously.Bogomolov to the scattering phenomenon of visible ray by the fat in research milk and protein, is sent out regression modeling with offset minimum binary and achieves measurement to fat content and protein content.Dry rubber content in latex and specific inductive capacity (real part), by the specific inductive capacity of latex under measurement room temperature, are set up linear relationship, can be measured for the dry rubber content in latex by Jayanthy.The people such as RejiKumar propose the dry rubber content measured by capacitance type sensor method in Heveatex.Week of Analysis and Measurements Center, Chinese Academy of Tropical Agriculture Sciences a kind of dry rubber content of hot spoke pneumatic process Fast Measurement Heveatex of clever utility model.But these indirect analysis methods also have shortcoming, such as consumption reagent is many, sample pretreatment process is loaded down with trivial details, thus cannot realize Quick Measurement.
Optical technology and electronic technology combine by photoelectric technology, cause that people produce, life and the great change of the mode of operation, and photoelectric technology has become the maximum feature of 21 century Information Technology Development.At present; just integrated at photoelectric material and device, Detection Techniques, optical, mechanical and electronic integration, opto-electronic microstructures and the military field develop rapidly of photoelectric technology; and combine with various new and high technology, promote the improvement of energy development, environmental protection, grain-production, health care.
Utility model content
The purpose of this utility model is the main component content measuring system of a kind of highly sensitive emulsion of design, and provides a kind of method adopting this detection system to carry out major component content detection.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
The main component content measuring system of a kind of emulsion, comprise light guide module, signal source module, fiber coupling module and photodetector, described light guide module is provided with optic fibre input end, fiber-optic output and fibre-optical probe, described fiber coupling module comprises some self-focusing optical fibers, and optic fibre input end, fiber-optic output are connected self-focusing optical fiber respectively with on fibre-optical probe; Wherein, described fiber-optic output connects photodetector by self-focusing optical fiber, and optic fibre input end is by self-focusing optical fiber connection signal source module.
Wherein, described light guide module is W-type fiber, comprises five ports, and wherein have two for fiber-optic output, two is fibre-optical probe, an optic fibre input end; Described two fibre-optical probe structures are identical, and its end face then comprises internal layer and skin, and internal layer is used for the light entering light guide module optic fibre input end to impinge perpendicularly in liquid, outer for receiving the light of reflection liquid.
Further, described signal source module adopts near-infrared LED, and described signal source module is coupled with optic fibre input end, and the self-focusing optical fiber length that optic fibre input end connects is the odd-multiple of L/4,
wherein α is a constant, n
0for refractive index.
Further, described illuminant module is photodetector, and this photodetector and signal source module match in spectral characteristic.
Further, this system comprises two containers for contain fluid, and also comprise a thermostat, described thermostat is placed on below container, for keeping the temperature treating liquid.
Preferred as one, described fibre-optical probe keeps vertical with the liquid level of samples of latex to be measured and distilled water.
Preferred as one, be connected to the lower surface of the self-focusing optical fiber on fibre-optical probe, be connected with the shading ring of taper, described shading ring is curled into by hard material, and its inside surface is with dark coating.
The main component content measuring method of a kind of emulsion, the method provides signal conversion module, photo-signal pre-amplifying module, secondary to remove temperature drift amplification module and signal processing module, it is characterized in that: the method is implemented in accordance with the following steps:
Step one, the container filling samples of latex is placed immediately below a fibre-optical probe, the container filling distilled water is placed on immediately below another fibre-optical probe, signal source module is luminous, be irradiated to light guide module by fiber coupling module, the beam orthogonal that light guide module is formed is irradiated to the light signal of samples of latex surface formation with samples of latex information;
Step 2, repeatedly step one, finally obtain photo-signal;
Step 3, carries out signal amplification and conversion to photo-signal, adopts two-stage amplifying circuit to amplify photo-signal;
Step 4, configures the samples of latex of several known major component concentration, identifies, construct according to the standard equation of major component content with digital signal change to the digital signal that signal converter exports;
Step 5, measures the major component content of samples of latex to be measured, repeats step one to step 3, and is calculated by the standard equation that signal converter output valve substitution step 4 obtains, and can show in real time and this time measure major component content in sample.
Further, described step one specifically refers to:
Step 1.1: adopt near-infrared LED as signal source module, light signal is coupled in W-type fiber by self-focusing optical fiber, and is divided into the identical two-way of light intensity from fibre-optical probe outgoing;
Step 1.2: also vertical irradiation is on samples of latex surface to be measured and distilled water surface respectively by self-focusing optical fiber convergence for the two-way light of outgoing, and the light being irradiated into samples of latex, after emulsion diffuse scattering, carries the component content information of samples of latex; The light being irradiated into distilled water, after mirror-reflection, carries the information of distilled water liquid minute surface reflective light intensity, and the light signal after two-way reflection is coupled in W-type fiber through self-focusing optical fiber again.
Further, described step 3 specifically refers to:
Step 3.1: adopt two pre-amplifying modules samples of latex and distilled water two-way photo-signal are amplified respectively and convert voltage signal to;
Step 3.2: go temperature drift amplification module that samples of latex signal and distilled water signal are carried out to differential amplification and be transported to signal conversion module by secondary.
Further, described step 4 specifically refers to:
Step 4.1: the samples of latex configuring different known major component concentration, according to step one to the measuring process of step 3, for the samples of latex of each concentration, records corresponding signal conversion module output valve successively;
Step 4.2: adopt BaSO
4as samples of latex with reference to blank, then according to according to step one to the measuring process of step 3, the signal conversion module output valve that record is corresponding;
Step 4.3: carry out regretional analysis to measurement data, and set up regression equation, is loaded into standard equation in signal processing module flow chart of data processing.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
The utility model proposes the main component content measuring system of a kind of emulsion, use W-type fiber as NOT-function type sensor, be namely used as to pass light-path, ensure during measurement that light vertically injects testing liquid, can measure the main component content in emulsion fast and accurately, strong adaptability, usable range is wide.
Probe increases in addition and arranges shading ring, shading ring stretches out the part of fibre-optical probe, its inwall blacking, while guarantee does not affect sample scattering light-receiving, block the reflected light of chamber wall, do not disturb by external condition, and cost is low, use operation is easy to left-hand seat, easy to maintenance.
Photodetector it should be noted that the device of selection must mate in spectral characteristic with signal source in use, namely needs the service band according to signal source, selects the photodetector that spectral response is good.What play opto-electronic conversion effect in the utility model is the PIN type photodiode that spectral response is good.
Not only integrated level is high for measuring system, consumption sample size is few, and is a kind of non-destructive measuring method.Measuring system also achieves the real-time display to measurement result, is highly suitable for the Measurement and analysis of the main component content of emulsion, and can realize display in real time.
Based on the main component content measuring method of this measuring system, adopt linear regression analysis manipulate measurement data, and increase the impact that a road reference signal is used for eliminating the outer bound pair systematic survey stability such as temperature drift; Supporting hardware circuit, is configured with pre-amplifying module circuit and amplifies micro-current signal, and design secondary goes temperature drift amplifying circuit to reduce the impact of humiture drift on systematic survey; Digital filtering is carried out to obtained signal, and then calculates the main component content in emulsion by standard equation.Not only integrated level is high for measuring system, consumption sample size is few, and is a kind of non-destructive measuring method; Measuring method also achieves the real-time display to measurement result, is highly suitable for the Measurement and analysis of the main component content of emulsion.
Accompanying drawing explanation
Fig. 1 is the block diagram of the main component content measuring system of a kind of emulsion;
Fig. 2 is light transmition path in self-focusing optical fiber;
Fig. 3 is the structural drawing of W-type fiber in the main component content measuring system of a kind of emulsion;
Fig. 4 is a kind of emulsion main component content measuring system light intensity Changing Pattern schematic diagram;
Fig. 5 is shading ring schematic diagram in the main component content measuring system of a kind of emulsion;
Fig. 6 is pre-amplification circuit figure in the main component content measuring method of a kind of emulsion;
Fig. 7 is second amplifying circuit figure in the main component content measuring method of a kind of emulsion;
Fig. 8 is signal processing module hardware circuit schematic diagram in the main component content measuring method of a kind of emulsion;
Fig. 9 is the process flow diagram that in the main component content measuring method of a kind of emulsion, processor reads data;
Figure 10 is digital filtering process flow diagram in the main component content measuring method of a kind of emulsion;
Figure 11 calculates major component content process flow diagram in the main component content measuring method of a kind of emulsion;
Figure 12 is a kind of embodiment data fitting curve map adopting emulsion main component content measuring system;
Figure 13 is a kind of embodiment data fitting curve map adopting emulsion main component content measuring system;
Figure 14 is a kind of embodiment data fitting curve map adopting emulsion main component content measuring system.
Wherein,
101 near-infrared LED 102 photodetector 103 photodetectors
104 self-focusing optical fiber 105 self-focusing optical fiber 106 self-focusing optical fibers
107 W-type fiber 108 self-focusing optical fiber 109 self-focusing optical fibers
110 measuring cup 111 measuring cup 112 thermostatic control modules
113 pre-amplification circuit 114 pre-amplification circuit 115 secondary differential amplifier circuits
116 A/D modular converter 117 processor 118 charactrons
119 operational amplification circuit module 120 lifting table 121 photoelectric sensor module
122 measuring system main bodys
301 fiber-optic output 302 optic fibre input end 303 optic fibre input ends
304 fiber-optic output 305 fibre-optical probe 306 fibre-optical probes
307 reflection ray entrance port, original light exit portal 308 reflection ray entrance ports 309
310 original light exit portal 311 reflection ray exit portal 312 original light entrance ports
313 reflection ray exit portals
501 shading ring 502 shading rings
800 shift registers.
Embodiment
The utility model provides the main component content measuring system of a kind of emulsion and measuring method thereof, and for making the purpose of this utility model, technical scheme and effect clearly, clearly, and further describe the utility model with reference to accompanying drawing examples.Should be appreciated that concrete enforcement described herein is only in order to explain the utility model, and be not used in restriction the utility model.
In order to reach above-mentioned utility model object, the technical solution of the utility model is main component content measuring system in the emulsion based on W-type fiber sensor, and its corresponding measuring system composition as shown in Figure 1, specifically comprises following modules:
Light guide module 107, signal source module 101, fiber coupling module comprise five self-focusing optical fibers 104,105,106,108,109 and illuminant module, light guide module 107 is provided with optic fibre input end 312, fiber-optic output and fibre-optical probe, and optic fibre input end 312, fiber-optic output are connected self-focusing optical fiber respectively with on fibre-optical probe; Wherein, described fiber-optic output connects illuminant module by self-focusing optical fiber, and optic fibre input end 312 is by self-focusing optical fiber connection signal source module 101.
Signal source module 101, the initialize signal for system is launched.Transmitting of this signal source is the key of native system, higher to the requirement of stability, light emitting diode (LED) is a kind of incoherent light source, spectral line is wider and emission angle is larger, in short distance optical transport, Application comparison is extensive, LED has the advantages such as operating voltage is low, fast response time, small volume and less weight, long service life, meets requirement of the present utility model, therefore selects near-infrared LED as the signal source of system.
Wherein, above-mentioned light guide module 107 is W-type fiber, comprises five ports, and wherein having two to be fiber-optic output 313,311, two is fibre-optical probe 306 and 305, an optic fibre input end 312; Two fibre-optical probe structures are identical, its end face then comprises internal layer and skin, one of them fibre-optical probe 305 is positioned at above samples of latex to be measured, its internal layer is used for the light entering light guide module 107 optic fibre input end to impinge perpendicularly on samples of latex, and its outer being used for receives by the irreflexive light of samples of latex; Another fibre-optical probe 306 is positioned at above distilled water, and its internal layer is used for the light entering light guide module optic fibre input end to impinge perpendicularly on distilled water, and its outer being used for receives by the irreflexive light of distilled water.
W-type fiber is a kind of novel optical fiber, and utilize it can realize being separated of incident light and reflected light, thus substantially eliminating the impact of bias light, decrease the impact of light source fluctuation and mirror-reflection, its structure as shown in Figure 3 simultaneously.Here, the concrete operations of W-type fiber are described.
The input end 302 and 303 of light guide module 107 is respectively as the signal input part of light guide module, and its public input end face is 312; 301 and 304 respectively as the signal output part of light guide module, and its output end face is 311 and 313.Fibre-optical probe 305 is identical with 306 structures, and their end face then comprises two parts, and wherein, the interior layer segment of a fibre-optical probe 305 is 310 outer section is 309, and the interior layer segment of another fibre-optical probe 306 is 307 outer section is 308; The internal layer 310 of fibre-optical probe 305 is for impinging perpendicularly on samples of latex by the light entering light guide module 107 input end 302, and the skin 309 of fibre-optical probe 305 is for receiving by the irreflexive light of samples of latex.The internal layer 307 of fibre-optical probe 306 is for impinging perpendicularly on the surface of distilled water by the light entering light guide module 107 input end 303, the skin 308 of fibre-optical probe 306 is for receiving the light reflected by distilled water.
Entered the light of optical fiber by the skin 309 of fibre-optical probe 305, be through the light after samples of latex diffuse reflection to be measured, therefore must carry the major component content information of samples of latex.Entered the light of optical fiber by the skin 308 of fibre-optical probe 306, be through the light after distilled water reflection, therefore carry the information of liquid minute surface reflective light intensity.Two light signals detected make differential amplification, namely eliminate the impact of the extraneous factor such as mirror-reflection and light source fluctuation, only have diffuse reflection light intensity.Due to diffuse reflection light intensity and samples of latex concentration to be measured, namely the major component content in sample, there is substantial connection, the difference of the intensity of the reflected light therefore penetrated according to output terminal 301 and 304, just can draw the major component percentage composition of samples of latex to be measured, the measuring principle place of this namely native system.
From the light that the fiber-optic output 311 and 313 of light guide module 107 penetrates, after coupled fiber module 106 and 104, be mapped to photodetector 103 and 102 on the surface, convert these two light signals to electric signal by photodetector 103 and 102.Photodetector is sealed in a magazine, to avoid the impact by ambient light.Detect this two electrical signal intensity, be namely equivalent to the intensity of sensed light signal, so electric signal also just reflects the major component content information of emulsion to be measured.
Further, described signal source module adopts near-infrared LED, and described signal source module is coupled with optic fibre input end, and the self-focusing optical fiber length that optic fibre input end connects is the odd-multiple of L/4,
wherein α is a constant, n
0for refractive index.
Fiber coupling module 105 is coupled in light guide module 107 for the initialize signal launched by signal source module 101; Fiber coupling module 108 and 109 is for being irradiated to liquid surface by initialize signal injection, and the optical signal of being returned by reflection liquid enters in light guide module 107; Fiber coupling module 104 and 106 penetrates to photodetector 102 and 103 for the light signal of being returned by sample reflection.Here the fiber-optic coupling method that fiber-optic coupling method and the utility model use is described.
Because the input end 312 of signal source needs and optical fiber is coupled, adopt the mode of GRIN-coupled in system described in the utility model, in self-focusing optical fiber, light transmition path as shown in Figure 2.As can be seen from the figure, the light of different incidence angles is propagated and is had identical space periodic in self-focusing optical fiber
wherein α is a constant, n
0for refractive index.When self-focusing optical fiber length gets the odd-multiple of L/4 or L/4, when light penetrates from fiber cross-sections, be all penetrate along sinusoidal tangential direction, namely to be parallel to the direction injection of shaft axis of optic fibre.Therefore, when the self-focusing optical fiber length selected is 1/4 times of period L, can realize being coupled to the high-level efficiency of signal.
The key that native system measures emulsion major component content is exactly measure the light intensity penetrated by fiber-optic output 301 and 304.Therefore, ensure that its stability is the key obtaining accurate measurements.
The factor affecting the strength stability of the light signal penetrated by fiber-optic output 301 and 304 mainly contains following three.
The first, enter the stability of the initial beam intensity of light guide module 107, i.e. the stability of signal source module 101 output.The signal source of native system is near-infrared LED.We are stabilized voltage supply to the power supply that near-infrared LED is powered, and through measuring, output intensity is stablized, coincidence measurement requirement.
In the present embodiment, illuminant module for receiving the light signal from W-type fiber outgoing, and converts light signal to electric signal.Illuminant module is made up of photodetector 102 and 103, and they are the electron devices measured light signal being converted to electric signal.Photodetector it should be noted that the device of selection must mate in spectral characteristic with signal source in use, namely needs the service band according to signal source, selects the photodetector that spectral response is good.What play opto-electronic conversion effect in the utility model is PIN type photodiode.
The second, fibre-optical probe 305 and 306 respectively with the distance of emulsion liquid level and distilled water liquid level.The factor affecting output terminal injection light signal strength is not only the major component concentration of samples of latex, also with the distance dependent of fibre-optical probe to liquid level.Therefore, only have and keep fibre-optical probe 305 equal and constant to the distance of distilled water liquid level to the distance of samples of latex liquid level, fibre-optical probe 306, guarantee output terminal 301 is only relevant with the major component concentration of samples of latex with the difference of the intensity of the light signals of 304 injections.
In concrete measurement, the initial light that the internal layer due to fibre-optical probe penetrates, after liquid level reflection, will return from skin.Therefore, must vertical incidence be ensured, namely ensure that fibre-optical probe 305 keeps vertical with emulsion liquid level, ensures that fibre-optical probe 306 and distilled water liquid level keep vertical.The probe 305 and 306 of W-type fiber to be hung down identical length from the platform of place system, and makes all to keep vertical in its measurement afterwards.
Measure samples of latex to be measured and the distilled water of same volume, pour in measuring cup 111 and 110 respectively, measuring cup 111 and 110 is placed on a thermostat 112 simultaneously, then whole thermostat 112 is placed on a lifting table that can finely tune 120.Be put in immediately below the fibre-optical probe 305 and 306 hung down by measuring cup 111 and 110, ensure that the light penetrated by probe 305 just in time can be mapped to the central authorities of emulsion liquid level, the light penetrated by probe 306 just in time can be mapped to the central authorities of distilled water liquid level.Then just the distance of fibre-optical probe to liquid level can be controlled by the height adjusting lifting table 120.
Found by above-mentioned experiment in a large number, make the liquid level of samples of latex to be measured draw near when fibre-optical probe is close by the height adjusting lifting table, first become from the light intensity of fiber-optic output 301 injection and diminish again greatly.Light intensity Changing Pattern as shown in Figure 4.
If measuring distance choosing is excessive, then signal is fainter, not easily differentiates; If measuring distance choosing is too small, small distance variation will cause very large error.The summit place (x=2.8cm) of curve, slope is minimum, and namely the impact that exports voltage of the change of distance is minimum.Meanwhile, the signal intensity at this place is also maximum, therefore selects this distance to be optimum measurement distance.In calibration and the process measured, probe and the distance of emulsion liquid level are all selected and are worth for this reason, by the sample that measures determined volume with to ensure that shading ring gos deep into the degree of depth of measuring vessel constant, can ensure the constant of measuring distance.
3rd, the impact of parasitic light.From the light that the internal layer of fibre-optical probe penetrates, after liquid level reflection, return optical fiber from skin.Outside exposed owing to popping one's head in, parasitic light must be had also along with reflected light enters in optical fiber together, and finally be detected device reception.The light that parasitic light mainly comprises ambient light and reflects through the wall of cup of contain fluid container.These two kinds of parasitic lights, due to only relevant with external condition, do not carry the information of any samples of latex, therefore must filtering.
In order to the parasitic light that filtering is above-mentioned, spy devises shading ring as shown in Figure 5.Shading ring 501 and 502 structures are with identical in shape.They can be made with any hard material, are enclosed into coniform, and are separately fixed on fibre-optical probe, and height does suitable selection according to fibre-optical probe to the height of liquid level.Shading ring 501 and 502 stretches out the part of fibre-optical probe, its inwall blacking, while guarantee does not affect sample scattering light-receiving, blocked the reflected light of chamber wall.
After using shading ring 501 and 502, owing to being vertical incidence, the light from the outgoing of fibre-optical probe 305 internal layer 310 and the light from the outgoing of fibre-optical probe 306 internal layer 307 still can turn back to optical fiber from outer 309 and 308 after reflection liquid.And through the light of wall of cup reflection and the stop of ambient light due to shading ring 501 and 502 and the absorption of its black inwall, the overwhelming majority cannot enter in optical fiber, has dropped to minimum on the impact of measurement result.
Thermostatic control module 112, for carrying out temperature compensation to measuring system.The difference of sample temperature, can cause the difference of sample absorbance.In order to ensure the precision measured, thermostatic control must be carried out to sample.The utility model devises the compact temperature control system based on thermoelectric refrigerating unit (TEC).After temperature sensor obtains the real time temperature of sample, PWM ripple is regulated to control bipolar drive device output current, by TEC realization to the heating of sample or refrigeration according to the controlling value exported.Designed system volume is little, and cost is low, and this system can be helped under dynamic temperature to realize constant temperature measurement.
Also provide a liftable objective table module 120 in the present embodiment, the height of liftable objective table can regulate, thus controls emulsion and the distance between distilled water liquid level and fibre-optical probe.
Emulsion major component is detected and will solve following three problems: first is a kind of high-precision photoelectric sensor system of design; Second Problem designs supporting hardware circuit, wherein most importantly designs photocurrent pre-amplifying module circuit and amplify micro-current signal, and the impact that design secondary goes temperature drift amplifying circuit to drift about on systematic survey to reduce humiture; 3rd is the process that design data treatment scheme realizes to signal, carries out digital filtering to obtained signal, and then calculates the main component content in emulsion by standard equation.
Adopt the emulsion main component content measuring system that provides of the utility model to solve first problem as high-precision optical sensor system, reoffer supporting hardware circuit and accurately measuring method the full embodiment to emulsion major component content measurement can be provided.
As auxiliary hardware circuit, measuring method disclosed in the utility model also provides following equipment:
Photo-signal pre-amplifying module 113,114, for amplifying photo-signal and current signal being converted to voltage signal, is the pith of measuring system main body.Fig. 6 gives pre-amplification circuit of the present utility model, and it is as follows that output voltage expresses formula:
Secondary removes temperature drift amplification module 115, in order to eliminate the components and parts performance drift caused by outside environmental elements, simultaneously also in order to the amplification again of voltage signal.Add a road reference signal, for receiving the scattered light signal of distilled water, otherwise design is completely the same with measurement branch road.Second amplifying circuit as shown in Figure 7, V
1represent the output of measuring branch road pre-amplification circuit, pass through R
2and R
4be coupled to the in-phase end of amplifier, V
2represent that the pre-amplification circuit of reference arm exports reference signal, pass through R
1be coupled to the end of oppisite phase of amplifier.
Signal conversion module 116, for transferring the analog voltage signal of output to digital signal.
Signal processing module 117, for exporting the process of data to the A/D converter in signal conversion module 116, and the display of data in display module 118.It is the core of whole measuring system main body, is divided into hardware components and flow chart of data processing part.
Data disaply moudle 118, for the concentration of real-time display measurement sample.The utility model utilizes processor 117 to realize LED numeral method.
Operational amplification circuit module 119, for amplifying the electric signal after opto-electronic conversion, comprises pre-amplification circuit 113,114 and secondary differential amplifier circuit 115.Wherein the circuit structure of pre-amplification circuit 113 and 114 is just the same.Scattered light is received by photodiode 103 and 102 respectively via after output terminal 301 and 304 output of light guide module 107, is converted to photo-signal.The signal exported from photodetector 103 with the information of sample composition content, but very faint, only have a microampere rank, therefore need the amplification through amplifying circuit, Here it is pre-amplification circuit.Simultaneously in order to eliminate outside environmental elements (temperature, humidity etc.) on the impact of components and parts performance and reduce entrained by mirror-reflection and that concentration has nothing to do information, eliminate the impact of light source fluctuation, have also been devised a road reference signal, namely from the photo-signal with distilled water mirror-reflection that photodetector 102 exports.The enlarge leadingly of reference signal exports and exports with the pre-amplification circuit of sample message and does first difference and amplify, and forms second amplifying circuit 115.
In hardware components, microcontroller adopts the general processor AT89C52 in 8051 series.Fig. 8 is the connection diagram of microcontroller AT89C52 and A/D converter MC14433, shift register.
Adopt above-mentioned measuring system and hardware device, realize the main component content measuring method of emulsion, the method is implemented in accordance with the following steps:
Step one, signal source module is luminous, is irradiated to light guide module by fiber coupling module, and the beam orthogonal that light guide module is formed is irradiated to the light signal of samples of latex to be measured surface formation with samples of latex information to be measured;
Step 1.1: adopt near-infrared LED as signal source module, light signal is coupled in W-type fiber by self-focusing optical fiber, and is divided into the identical two-way of light intensity from fibre-optical probe outgoing;
Step 1.2: also vertical irradiation is on samples of latex surface to be measured and distilled water surface respectively by self-focusing optical fiber convergence for the two-way light of outgoing, and the light being irradiated into samples of latex, after emulsion diffuse scattering, carries the component content information of samples of latex to be measured; The light being irradiated into distilled water, after mirror-reflection, carries the information of liquid minute surface reflective light intensity, and the light signal after two-way reflection is coupled in W-type fiber through self-focusing optical fiber again.
Step 2, repeatedly step one, finally obtain photo-signal.
Step 3, carries out signal amplification and conversion to photo-signal, adopts two-stage amplifying circuit to amplify photo-signal;
Step 3.1: adopt two pre-amplifying modules samples of latex to be measured and distilled water two-way photo-signal are amplified respectively and convert voltage signal to;
Step 3.2: go temperature drift amplification module that samples of latex signal to be measured and distilled water signal are carried out to differential amplification and be transported to signal conversion module by secondary.
Step 4, configures the samples of latex of several known major component concentration, identifies, construct according to the standard equation of major component content with digital signal change to the digital signal that signal converter exports;
Step 4.1: the samples of latex configuring different known major component concentration, according to step one to the measuring process of step 3, for the samples of latex of each concentration, records corresponding signal conversion module output valve successively;
Step 4.2: adopt BaSO
4as the reference white plate of samples of latex, then according to according to step one to the measuring process of step 3, the signal conversion module output valve that record is corresponding;
Step 4.3: carry out regretional analysis to measurement data, and set up regression equation, is loaded into standard equation in signal processing module flow chart of data processing.
Step 5, measures the major component content of samples of latex to be measured, repeats step one to step 3, and is calculated by the standard equation that signal converter output valve substitution step 4 obtains, and can show in real time and this time measure major component content in sample.
Flow chart of data processing is divided into two parts, and a part is that microprocessor reads the data converted from A/D converter; Another part is the measurement to the main component content of samples of latex to be measured, comprises the calculating of absorbance conversion and main component content value.
In Part I design, the flow process of digital independent as shown in Figure 9.Wherein this system digits filtering is that its process flow diagram as shown in Figure 10 based on the compound filter on medium filtering and average value filtering basis.
In Part II design, need the standard model configuring each concentration in scaling experiment, carry out linear regression analysis by the mass data measured standard model, determine regression equation
Y=ax+b (2) this formula is the function of y about x, and x represents the diffuse reflection absorbance of samples of latex, and y represents the major component percentage composition value of samples of latex; The diffuse reflection absorbance x of samples of latex is calculated by formula (3):
Wherein V
referencebe the light intensity value surveying BaSO4 blank gained, represented by output voltage values, V
samplebe the light intensity value surveying samples of latex gained, represented by output voltage values.By the calibration data recorded, obtain coefficient a, the value of b, thus confirmed standard equation.
Finally calculate major component content, the flow process of its data processing as shown in figure 11: first calculating absorption values, then by calling the calibration equation counting subroutine be loaded in microprocessor, computing can obtain the major component percentage composition of sample.
For the pre-amplification circuit module of system, based on micro-current magnification principle and high precision, ICL 7650 amplifier of high-gain is used to realize the amplification conversion of faint optical signal.
For signal conversion module, select MC14433 tri-and half double integral A/D converter, select the general processor AT89C52 in 8051 series.When measuring sample, the light of sample and distilled water scattering is exported by W-type fiber output terminal and respectively by photoelectric detector, then delivers to A/D converter after the amplification of two-stage amplifying circuit.When microprocessor inquire data switching signal port INT1 effective time, by the translation data of microcomputer reads MC14433, after data processing, substitute into the main component content calculating samples of latex in the standard equation demarcated in advance, finally deliver to display module 118 display measurement result.
Embodiment 1
Example is measured as with dry rubber content in natural concentrated latex.Needed first to calibrate before measurement unknown concentration sample, can directly measure later.Configuration standard concentration samples, minimum dry rubber content concentration is 15%, and most high level cadre's glue content concn is 50%, interval 5%, totally 8 groups of samples.By BaSO
4blank and these 8 groups of samples are successively placed on below fibre-optical probe 1, distilled water is placed on below fibre-optical probe 2, read the magnitude of voltage (available oscillograph records) that second amplifying circuit module exports successively, and magnitude of voltage is substituted into formula (2) by the absorbance data record calculated as table 1.
Latex tables of data measured by table 1
The fit equation obtained is
y＝-128.128x+72.54 (4)
The curve of matching as shown in figure 12, horizontal ordinate be Heveatex absorbance, ordinate is the dry glue percentage composition of Heveatex.
During concrete measurement, the Heveatex sample of unknown dry rubber content is put into system described in the utility model, directly can show its dry glue percentage composition on digital display tube.
Embodiment 2
Example is measured as with fat content in soya-bean milk.Needed first to calibrate before measurement unknown concentration sample, can directly measure later.Configuration standard concentration samples, minimum fat content concentration is 0.213%, and most high fat content concentration is 1.698%, totally 8 groups of samples.By BaSO
4blank and these 8 groups of samples are successively placed on below fibre-optical probe 1, distilled water is placed on below fibre-optical probe 2, read the magnitude of voltage (available oscillograph records) that second amplifying circuit module exports successively, and magnitude of voltage is substituted into formula (2) by the absorbance data record calculated as table 2.
Soya-bean milk tables of data measured by table 2
The fit equation obtained is
y＝-7.176x+2.59 (5)
The curve of matching as shown in figure 13, horizontal ordinate be soya-bean milk absorbance, ordinate is the percent fat of soya-bean milk.
During concrete measurement, the soybean milk samples of unknown fat content is put into system described in the utility model, directly can show its percent fat on digital display tube.
Embodiment 3
Example is measured as with fat content in coconut milk.Needed first to calibrate before measurement unknown concentration sample, can directly measure later.Configuration standard concentration samples, minimum fat content concentration is 0.415%, and most high fat content concentration is 1.168%, totally 8 groups of samples.By BaSO
4blank and these 8 groups of samples are successively placed on below fibre-optical probe 1, distilled water is placed on below fibre-optical probe 2, read the magnitude of voltage (available oscillograph records) that second amplifying circuit module exports successively, and magnitude of voltage is substituted into formula (2) by the absorbance data record calculated as table 3.
Coconut milk tables of data measured by table 3
The fit equation obtained is
y＝-5.843x+2.439 (6)
The curve of matching as shown in figure 14, horizontal ordinate be coconut milk absorbance, ordinate is the percent fat of coconut milk.During concrete measurement, the coconut milk sample of unknown fat content is put into system described in the utility model, directly can show its percent fat on digital display tube.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the utility model.
Claims (6)
1. the main component content measuring system of emulsion, it is characterized in that: comprise light guide module, signal source module, fiber coupling module and illuminant module, described light guide module is provided with optic fibre input end, fiber-optic output and fibre-optical probe, described fiber coupling module comprises some self-focusing optical fibers, and optic fibre input end, fiber-optic output are connected self-focusing optical fiber respectively with on fibre-optical probe; Wherein, described fiber-optic output connects illuminant module by self-focusing optical fiber, and optic fibre input end is by self-focusing optical fiber connection signal source module.
2. the main component content measuring system of a kind of emulsion according to claim 1, it is characterized in that: described light guide module is W-type fiber, comprise five ports, the most left and the low order end two of its middle and upper part is fiber-optic output, two of bottom is fibre-optical probe, and the optic fibre input end in the middle of top; Described two fibre-optical probe structures are identical, and its end face comprises internal layer and skin, and internal layer is used for the light entering light guide module optic fibre input end to impinge perpendicularly in liquid, outer for receiving the light of reflection liquid.
3. the main component content measuring system of a kind of emulsion according to claim 1, it is characterized in that: described signal source module adopts near-infrared LED, described signal source module is coupled with optic fibre input end, and the self-focusing optical fiber length that optic fibre input end connects is the odd-multiple of L/4
wherein α is a constant, n
0for refractive index.
4. the main component content measuring system of a kind of emulsion according to claim 3, is characterized in that: described illuminant module is photodetector, and this photodetector and signal source module match in spectral characteristic.
5. according to the emulsion main component content measuring system of Claims 1-4 described in any one, it is characterized in that: this system comprises two containers for contain fluid, also comprise a thermostat, described thermostat is placed on below container, for keeping the temperature treating liquid.
6. the main component content measuring system of a kind of emulsion according to claim 5, it is characterized in that: be connected to the lower surface of the self-focusing optical fiber on described fibre-optical probe, be provided with the shading ring of taper, described shading ring is curled into by hard material, and its inside surface is with dark coating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111602051A (en) * | 2017-12-22 | 2020-08-28 | 恩德斯+豪斯流量技术股份有限公司 | Method and apparatus for measuring fat in milk |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111602051A (en) * | 2017-12-22 | 2020-08-28 | 恩德斯+豪斯流量技术股份有限公司 | Method and apparatus for measuring fat in milk |
| US11579060B2 (en) | 2017-12-22 | 2023-02-14 | Endress+Hauser Flowtec Ag | Method and device for measuring fat in milk |
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