CN103424468A - System and method for detecting adulterated milk by aid of SAWR (surface acoustic wave resonator) - Google Patents
System and method for detecting adulterated milk by aid of SAWR (surface acoustic wave resonator) Download PDFInfo
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Abstract
The invention relates to a system and a method for detecting adulterated milk by the aid of an SAWR (surface acoustic wave resonator). By the aid of the system and the method, problems that a device for detecting the water content of milk by the aid of a surface wave technology is unavailable in the prior art and devices for detecting the water content of the milk by the aid of other technologies are complicated in structure and high in cost are solved. The system comprises a resonance detection unit. The resonance detection unit is provided with two detection electrodes, piezoelectric substrates are arranged at the ends of the detection electrodes, and an output end of the resonance detection unit is connected with a digital conversion unit and then is connected with a processing unit by the digital conversion unit. The system and the method have the advantages that a surface acoustic technology is adopted, the system is simple in structure and low in cost, the water content of the milk can be quickly detected in a nondestructive manner, and the detection precision is high.
Description
Technical field
The present invention relates to a kind of food inspection technology, especially relate to a kind of detection speed fast, detect the system that SAWR accurate, simple in structure detects adulterated milk, and SAWR detects the method for adulterated milk.
Background technology
Dairy products are indispensable food materials in the lives of the people, in recent years, on market, occurred manyly mixing milk with milk powder restored method inferior and pretending to be plain chocolate, long term consumer can be brought out a series of health problem after taking in, therefore urgent for a kind of adulterated milk detection method demand fast and accurately.
Surface acoustic wave (SAW) technology is born in the eighties in 19th century, the method for making high sensitivity, high integration, detecting element that size is little provides may.At present, existing many detection application based on the SAW device.In field of biological detection, also be widely used, as bacterial growth condition monitoring, food analysis, bio-medical analysis etc.Therefore be necessary to design a kind of wiping surface acoustic wave techniques, accurately detect fast the equipment of milk water cut, and detection method.
Chinese utility model patent, patent No. 201020144645.X, a kind of milk moisture fast monitored device based on near-infrared spectral analysis technology is disclosed, this device is comprised of light penetrating apparatus, fiber optic conduction, light detection device, multi-channel data acquisition device, microcomputer, and the light penetrating apparatus is comprised of full spectrum light source, lens, diffuse reflector, transmission detector.The wide spectrum optical that light source sends is through milk, will through the transmitted light of milk and through the scattered light of milk scattering jointly by the optical fiber transmission, then light splitting obtains multi-path light, after the light transmission optical filter of every road, arrive detector, detect each road light intensity situation, the machine Real-time Collection, analyze the compositions such as water cut that data draw milk as calculated.Although this device also can fast detecting milk water cut, this device adopts optical instrument to build, and apparatus structure is more complicated, and relative cost is also higher.
Summary of the invention
The present invention is mainly the device solved in prior art without surface wave technology for detection milk water cut, and adopt other technologies to detect the problem that milk water cut structure is more complicated, cost is higher, provide a kind of detection speed fast, detect the system that the SAWR accurate, simple in structure, that cost is low detects adulterated milk, and SAWR detects the method for adulterated milk.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of SAWR detects the system of adulterated milk, include the resonance detecting unit, described resonance detecting unit is provided with two detecting electrodes, detecting electrode is provided with piezoelectric substrate on termination, and described resonance detecting unit output terminal is connected with processing unit after connecting a digital conversion unit;
The resonance detecting unit: by detecting electrode, milk sample is detected, the output voltage simulating signal is to the digital conversion unit;
Digital conversion unit: voltage analog signal is calculated, obtain the frequency response values curve of this voltage analog signal, the frequency response values curve is sent to processing unit;
Processing unit: the frequency response values curve is sampled, calculate snr value by the non-linear stochastic resonance model, according to the signal to noise ratio (S/N ratio) that each standard model detection is obtained and the relational expression of milk sample water cut, calculate the water cut of current milk sample again.The present invention is that the SAW technology is detected the milk sample water cut by surface acoustic wave, the water cut that detects milk sample that can quick nondestructive, compare the equipment of other detection methods, and detection system structure of the present invention is simpler, volume is less, and accuracy of detection is higher.
As a kind of preferred version, on described piezoelectric substrate, etching is formed with an interdigital transducer, two reflecting gratings, be respectively arranged with the input utmost point and output stage at the interdigital transducer two ends, described two reflecting gratings are separately positioned on two side positions of interdigital transducer, upper and lower sides at reflecting grating is horizontally arranged with respectively the gain grid, at reflecting grating, away from interdigital transducer one side, also is provided with the sound-absorbing bar.When electric signal is added on interdigital transducer the two poles of the earth, the surface acoustic wave encouraged on piezoelectric substrate (Surface Acoustic Wave, SAW) is propagated to both sides, between the grid of left and right two reflecting gratings, Multi reflection occurs, and reflection wave is still received by interdigital transducer.The sound-absorbing bar leaks for fear of the SAW wave energy, and can stop the interference of ambient noise.The gain grid can prevent that the SAW ripple from overflowing from the blank position of reflecting grating, can, so that more SAW ripples are reflected back the input utmost point and output stage through reflecting grating, increase the accuracy detected like this.
As a kind of preferred version, described piezoelectric substrate is ST cut type quartz, the interdigital width a=1.9 of interdigital transducer μ m, interdigital spacing b=1.7 μ m, finger logarithm N=100, sound aperture W=720 μ m, the aluminum strip thickness H=200nm of interdigital finger, the finger number N of each reflecting grating
Re f=200, between the reflecting grating of both sides and interdigital transducer apart from s=9.0 μ m, the width of gain grid is the same with the reflecting grating width, between gain grid and reflecting grating apart from being 9.0 μ m.Interdigital transducer sends the centre frequency of 433.92MHz, cycle length M=7.2 μ m, and piezoelectric substrate adopts ST cut type quartz as base material but not other quartz crystal cut type (such as AT cuts, SC cut) is because it is more easily in high-frequency end work.Its Euler angle of ST cut type (ST=Stable Temperature) is (0 °, 132.75 °, 0 °).Sometimes this cut type is also referred to as " Y of X-direction propagation cuts quartz crystal ".
As a kind of preferred version, system also includes sample box, described sample box top is lid, described detecting electrode sealing is inserted on lid, and the detecting electrode front end extend near the sample box bottom position, side wall upper part at sample box is provided with inlet pipeline, be provided with outlet pipeline on bottom, be respectively arranged with on inlet pipeline and outlet pipeline and control the valve opened and closed, also include the temperature sensor of detected temperatures in sample box, well heater and control processor, described temperature sensor and well heater are separately positioned on sample box internal upper part position, and temperature sensor and well heater are connected on control processor.This sample box is hermetically-sealed construction, has prevented the impact on sample of temperature, humidity and other environmental factors.This sample enters sample box by water inlet pipe, in the time will emptying sample box, by opening outlet pipeline, discharges sample.Temperature sensor detects temperature in sample box, guarantee that sample is detected at suitable temperature, temperature sensor by the data transmission that detects to control processor, control processor is analyzed, if temperature is too low, as at arctic weather, can affect the sample activity, impact is by this precision, and control heater is heated, until stop after suitable temperature.Temperature sensor and well heater are arranged on the top of sample in box.
As a kind of preferred version, described sample box is cup or bottle, and the sample box height is 10～20cm, the sample box main body is square column type or cylindrical, if square column type, this sample box width and length are all 5～10cm, if cylindrical, this sample box diameter is 5～15cm.Sample box adopts cup or bottle, and preferred glass cup or bottle, can be also other materials, as plastics or metal.This lid covers on face and is provided with a spacing edge of circle, and spacing have O-ring seal along upper cover, and when lid covers, spacing edge is embedded in the sample box opening and seals with opening.
As a kind of preferred version, described sample box is covered with shielding box, described shielding box comprises that base and lid are placed in the cover body on base, cover body and base are by being hinged and connected, on the cover body edge of opening, be provided with to the contact edge of turning up, described contact is along on the face contacted with base, being provided with shielding strip, on base, corresponding contact is provided with shielding strip along position, on cover body except with the hinged edge of base, the contact at other edges all is provided with bound edge along front end, cover body covers lower time, bound edge wraps on the side of base, described cover body and base are made of metal, be coated with antirust coat on described cover body surface and susceptor surface, also be provided with handle on cover body.Shielding box can be opened, and sample box is placed in shielding box, and shielding box plays the interference of isolating exterior signal, has also reduced the impact of personnel on detecting simultaneously.This contact makes between cover body and base electric conductivity better along, shielding strip, makes shield effectiveness better.Bound edge makes cover body better contact with base, has improved shield effectiveness.
As a kind of preferred version, described resonance detecting unit comprises inductance L 1, inductance L 2, capacitor C 1, capacitor C 2, triode Q1, triode Q2, resistance R 1, resistance R 2, resonator P1, described two detecting electrodes are respectively the first detecting electrode and the second detecting electrode, after the second detecting electrode series inductance L1, with power supply, be connected, the first detecting electrode is connected on resonator P1 input end, resonator P1 output terminal is connected on triode Q1 base stage, resistance R 1 is connected between the second detecting electrode and triode Q1 base stage, capacitor C 2 is connected between the second detecting electrode and triode Q1 emitter, inductance L 2 is connected between the second detecting electrode and triode Q1 collector, triode Q1 emitter also is connected with triode Q2 collector, triode Q2 base stage connects power supply after by resistance in series R2, triode Q2 grounded emitter, capacitor C 1 one ends are connected to triode Q1 collector, capacitor C 1 other end connects resonance detecting unit output terminal.Form similar capacitance structure after two detecting electrodes stretch in sample, inductance L 2 and capacitor C 2 form the LC oscillatory circuit, and triode Q1 and triode Q2 play amplification, and inductance L 1 is for isolating alternating current, and capacitor C 1 is for the isolated DC electricity.Detect sample by the resonance detecting unit, by the output terminal output voltage signal.
A kind of SAWR detects the method for adulterated milk, comprises the following steps:
Step 1: detecting electrode is extend in sample and starts to detect, and the resonance detecting unit flows to the digital conversion unit by the voltage analog signal detected, and the digital conversion unit is calculated voltage analog signal, obtains the frequency response values curve;
Step 2: processing unit is processed the frequency response values curve, at 80～120 points of frequency response values curve up-sampling, the data that the curve sampling is obtained are as input data I nput(t), substitution non-linear stochastic resonance model calculates signal to noise ratio snr, and this non-linear stochastic resonance model algorithm is as follows:
ξ (t) is white Gaussian noise, and its auto-correlation connection function is: E[ξ (t) ξ (0)]=2D δ (t), a is input signal strength, f
0Be frequency modulating signal, D is noise intensity, and a, b are all real parameters, obtains signal to noise ratio (S/N ratio) to be:
S (ω) is signal spectral density, S
N(Ω) be the noise intensity in signal frequency range;
Get this signal to noise ratio (S/N ratio) peak of curve as the signal to noise ratio (S/N ratio) eigenwert;
Step 3: by signal to noise ratio (S/N ratio) eigenwert substitution milk sample water cut predictor formula:
Calculate the milk water cut.
As a kind of preferred version, described milk sample water cut predictor formula is calculated by following steps:
Get milk content and be respectively 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7 0.8,1.0 milk sample also is numbered, according to step 1 to two, respectively these milk samples are detected, obtain corresponding signal to noise ratio (S/N ratio) eigenwert, processing unit obtains prediction curve according to these milk sample content and signal to noise ratio (S/N ratio) eigenwert, and prediction curve is carried out to the relational expression that matching obtains signal to noise ratio (S/N ratio) and milk level
SNR＝-65.52727-17.67273Wk（R=-0.99596）
Then conversion obtains milk sample water cut predictor formula.
As a kind of preferred version, it is 15～20 ℃ that the sample test environment temperature is set.
Therefore, advantage of the present invention is: adopt surface acoustic wave techniques, and system architecture is simple, cost is low, can detect the milk water cut by quick nondestructive, and accuracy of detection is high.
The accompanying drawing explanation
Accompanying drawing 1 is a kind of structural frames diagram of the present invention;
Accompanying drawing 2 is a kind of structural representations of piezoelectric substrate in the present invention
Accompanying drawing 3 is a kind of structural representations of sample box in the present invention;
Accompanying drawing 4 is a kind of structural representations of shielding box in the present invention;
Accompanying drawing 5 is a kind of electrical block diagrams of resonance detecting unit in the present invention.
1-resonance detecting unit 2-digital conversion unit 3-processing unit 4-sample box 5-shielding box 6-detecting electrode 7-piezoelectric substrate 8-interdigital transducer 9-reflecting grating 10-gain grid 11-sound-absorbing bar 12-lid 13-control processor 14-well heater 15-temperature sensor 16-inlet pipeline 17-outlet pipeline 18-base 19-cover body 20-contact is along 21-shielding strip 22-valve 23-handle
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
A kind of SAWR of the present embodiment detects the system of adulterated milk, as shown in Figure 1, include resonance detecting unit 1, digital conversion unit 2 and processing unit 3, this resonance detecting unit has two detecting electrodes to sample detection 6, front end at detecting electrode is provided with piezoelectric substrate 7, the output terminal of resonance detecting unit is connected with the digital conversion unit, and the digital conversion unit is connected with processing unit.This processing unit can be computing machine, the data that detect is carried out to computing and finally obtain the milk moisture content value.
As shown in Figure 3, milk sample is placed in a sample box 4, this sample box is the sealing cup, adopt glass circle cup in the present embodiment, this sample box height is 15cm, diameter is 10cm, sample box top is lid 12, can be easy to open and close, lid covers on face and is provided with a spacing edge of circle, spacing have O-ring seal along upper cover, when lid covers, spacing edge is embedded in the sample box opening and seals with opening, be provided with two perforation on lid, be provided with rubber in perforation, be provided with hole in the middle of rubber, when detecting electrode does not insert, rubber is by aperture seal, when detecting electrode penetrates, rubber tightly encases detecting electrode, play sealing function.Detecting electrode extend in sample box by perforation, and the detecting electrode front end extend near the sample box bottom position, side wall upper part at sample box has been wholely set inlet pipeline 16, be wholely set outlet pipeline 17 on bottom, be respectively arranged with on inlet pipeline and outlet pipeline termination and control the valve 22 opened and closed, this valve can be the valve of manually controlling.Also include temperature sensor 15, well heater 14 and the control processor 13 of detected temperatures in sample box, temperature sensor and well heater are separately positioned in sample box, and be arranged on the sample box upper position, concrete is provided with projection on sample box top, be provided with cavity in projection and be used for placing control processor, well heater and temperature sensor are embedded in protruding side, and temperature sensor and well heater are connected on control processor.
As shown in Figure 2, piezoelectric substrate consists of ST cut type quartz, on piezoelectric substrate, etching is formed with an interdigital transducer 8, two reflecting gratings 9, be respectively arranged with the input utmost point and output stage on the upper and lower both sides of interdigital transducer, two reflecting gratings are separately positioned on the position, the left and right sides of interdigital transducer, at the upper and lower sides of reflecting grating, are horizontally arranged with respectively gain grid 10, at reflecting grating, away from interdigital transducer one side, also are provided with sound-absorbing bar 11.The interdigital width a=1.9 of this interdigital transducer μ m, interdigital spacing b=1.7 μ m, finger logarithm N=100, sound aperture W=720 μ m, the aluminum strip thickness H=200nm of interdigital finger, the finger number N of each reflecting grating
ref=200, between the reflecting grating of both sides and interdigital transducer apart from s=9.0 μ m, the width of gain grid is the same with the reflecting grating width, between gain grid and reflecting grating apart from being 9.0 μ m.
This piezoelectric substrate utilizes precision photolithography technique to make aluminum IDT and reflecting grating pattern on ST cut type quartz substrate surface, and its technological process comprises: grinding, cleaning → evaporation electrode film → whirl coating front baking → exposure → development, rinsing, post bake → corrosion → removing photoresist.
As shown in Figure 5, provided the circuit structure of resonance detecting unit, this resonance detecting unit includes inductance L 1, inductance L 2, capacitor C 1, capacitor C 2, triode Q1, triode Q2, resistance R 1, resistance R 2, resonator P1, in figure, 1 of components and parts P2 and 2 is respectively detecting electrode, these two detecting electrodes are designated as respectively the first detecting electrode and the second detecting electrode, after the second detecting electrode series inductance L1, with power supply, be connected, the first detecting electrode is connected on resonator P1 input end, resonator P1 output terminal is connected on triode Q1 base stage, resistance R 1 is connected between the second detecting electrode and triode Q1 base stage, capacitor C 2 is connected between the second detecting electrode and triode Q1 emitter, inductance L 2 is connected between the second detecting electrode and triode Q1 collector, triode Q1 emitter also is connected with triode Q2 collector, triode Q2 base stage connects power supply after by resistance in series R2, triode Q2 grounded emitter, capacitor C 1 one ends are connected to triode Q1 collector, capacitor C 1 other end connects resonance detecting unit output terminal.
The resonance detecting unit is arranged in shielding box 5, as shown in Figure 4, this shielding box comprises that base 18 and lid are placed in the cover body 19 on base, be provided with pin-joint piece on a sidewall of cover body, be provided with hinged seat on base, pin-joint piece is hinged on hinged seat, make cover body and base be hinged and connected, on the cover body edge of opening, be provided with to the contact of turning up along 20, contact is along on the face contacted with base, being provided with shielding strip 21, on base, corresponding contact is provided with shielding strip along position, on cover body except with the hinged edge of base, the contact at other edges all is provided with bound edge 24 along front end, when cover body covers, contact contacts with shielding strip on base along upper shielding strip, bound edge wraps on the side of base.Cover body and base are made of metal, and on cover body surface and susceptor surface, are coated with antirust coat, also are provided with handle 23 on cover body.
The detection method that this SAWR detects adulterated milk systems is to comprise the following steps:
Step 1: it is 20 ℃ that the sample test environment temperature is set, detecting electrode is extend in sample and starts to detect, the resonance detecting unit flows to the digital conversion unit by the voltage analog signal detected, and the digital conversion unit is calculated voltage analog signal, obtains the frequency response values curve;
Step 2: processing unit is processed the frequency response values curve, at 110 points of frequency response values curve up-sampling, the data that the curve sampling is obtained are as input data I nput(t), substitution non-linear stochastic resonance model calculates signal to noise ratio snr, and this non-linear stochastic resonance model algorithm is as follows:
ξ (t) is white Gaussian noise, and its auto-correlation connection function is: E[ξ (t) ξ (0)]=2D δ (t), a is input signal strength, f
0Be frequency modulating signal, D is noise intensity, and a, b are all real parameters, obtains signal to noise ratio (S/N ratio) to be:
S (ω) is signal spectral density, S
N(Ω) be the noise intensity in signal frequency range;
Get this signal to noise ratio (S/N ratio) peak of curve as the signal to noise ratio (S/N ratio) eigenwert;
Step 3: by signal to noise ratio (S/N ratio) eigenwert substitution milk sample water cut predictor formula:
Calculate the milk water cut.
This milk sample water cut predictor formula is by advance to drawing after multiple milk sample detection, and its process is:
Get milk content and be respectively 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7 0.8,1.0 milk sample also is numbered, according to step 1 to two, respectively these milk samples are detected, obtain corresponding signal to noise ratio (S/N ratio) eigenwert, processing unit obtains prediction curve according to these milk sample content and signal to noise ratio (S/N ratio) eigenwert, and prediction curve is carried out to the relational expression that matching obtains signal to noise ratio (S/N ratio) and milk level
SNR＝-65.52727-17.67273Wk（R=-0.99596）
Then conversion obtains milk sample water cut predictor formula.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has more been used the terms such as resonance detecting unit, digital conversion unit, processing unit, sample box, do not get rid of the possibility of using other term.Using these terms is only in order to describe more easily and explain essence of the present invention; They are construed to any additional restriction is all contrary with spirit of the present invention.
Claims (10)
1. a SAWR detects the system of adulterated milk, it is characterized in that: include resonance detecting unit (1), described resonance detecting unit is provided with two detecting electrodes (6), detecting electrode is provided with piezoelectric substrate on termination, and described resonance detecting unit output terminal is connected with processing unit (3) after connecting a digital conversion unit (2);
The resonance detecting unit: by detecting electrode, milk sample is detected, the output voltage simulating signal is to the digital conversion unit;
Digital conversion unit: voltage analog signal is calculated, obtain the frequency response values curve of this voltage analog signal, the frequency response values curve is sent to processing unit;
Processing unit: the frequency response values curve is sampled, calculate snr value by the non-linear stochastic resonance model, according to the signal to noise ratio (S/N ratio) that each standard model detection is obtained and the relational expression of milk sample water cut, calculate the water cut of current milk sample again.
2. a kind of SAWR according to claim 1 detects the system of adulterated milk, it is characterized in that being formed with an interdigital transducer (8) in the upper etching of described piezoelectric substrate (7), two reflecting gratings (9), be respectively arranged with the input utmost point and output stage at the interdigital transducer two ends, described two reflecting gratings are separately positioned on two side positions of interdigital transducer, be horizontally arranged with respectively gain grid (10) at the upper and lower sides of reflecting grating, at reflecting grating, away from interdigital transducer one side, also be provided with sound-absorbing bar (11).
3. a kind of SAWR according to claim 2 detects the system of adulterated milk, it is characterized in that described piezoelectric substrate (7) is ST cut type quartz, the interdigital width a=1.9 of interdigital transducer (8) μ m, interdigital spacing b=1.7 μ m, finger logarithm N=100, sound aperture W=720 μ m, the aluminum strip thickness H=200nm of interdigital finger, the finger number N of each reflecting grating (9)
ref=200, between the reflecting grating of both sides and interdigital transducer apart from s=9.0 μ m, the width of gain grid (10) is the same with the reflecting grating width, between gain grid and reflecting grating apart from being 9.0 μ m.
4. detect the system of adulterated milk according to claim 1 or 2 or 3 described a kind of SAWR, it is characterized in that system also includes sample box (4), described sample box top is lid, described detecting electrode (6) sealing is inserted on lid, and the detecting electrode front end extend near the sample box bottom position, side wall upper part at sample box is provided with inlet pipeline (16), be provided with outlet pipeline (17) on bottom, be respectively arranged with on inlet pipeline and outlet pipeline and control the valve (22) opened and closed, also include the temperature sensor (15) of detected temperatures in sample box, well heater (14) and control processor (13), described temperature sensor and well heater are separately positioned in sample box, and temperature sensor and well heater are connected on control processor.
5. a kind of SAWR according to claim 4 detects the system of adulterated milk, it is characterized in that described sample box (4) is cup or bottle, the sample box height is 10～20cm, the sample box main body is square column type or cylindrical, if square column type, this sample box width and length are all 5～10cm, if cylindrical, this sample box diameter is 5～15cm.
6. a kind of SAWR according to claim 4 detects the system of adulterated milk, it is characterized in that described sample box (4) is covered with shielding box (5), described shielding box comprises that base (18) and lid are placed in the cover body (19) on base, cover body and base are by being hinged and connected, on the cover body edge of opening, be provided with to the contact of turning up along (20), described contact is along on the face contacted with base, being provided with shielding strip (21), on base, corresponding contact is provided with shielding strip (21) along position, on cover body except with the hinged edge of base, the contact at other edges all is provided with bound edge (24) along front end, cover body covers lower time, bound edge wraps on the side of base, described cover body and base are made of metal, be coated with antirust coat on described cover body surface and susceptor surface, also be provided with handle (23) on cover body.
7. detect the system of adulterated milk according to claim 1 or 2 or 3 described a kind of SAWR, it is characterized in that described resonance detecting unit (1) comprises inductance L 1, inductance L 2, capacitor C 1, capacitor C 2, triode Q1, triode Q2, resistance R 1, resistance R 2, resonator P1, described two detecting electrodes are respectively the first detecting electrode and the second detecting electrode, after the second detecting electrode series inductance L1, with power supply, be connected, the first detecting electrode is connected on resonator P1 input end, resonator P1 output terminal is connected on triode Q1 base stage, resistance R 1 is connected between the second detecting electrode and triode Q1 base stage, capacitor C 2 is connected between the second detecting electrode and triode Q1 emitter, inductance L 2 is connected between the second detecting electrode and triode Q1 collector, triode Q1 emitter also is connected with triode Q2 collector, triode Q2 base stage connects power supply after by resistance in series R2, triode Q2 grounded emitter, capacitor C 1 one ends are connected to triode Q1 collector, capacitor C 1 other end connects resonance detecting unit output terminal.
8. a SAWR detects the method for adulterated milk, adopts the system in claim 1-6 any one, it is characterized in that comprising the following steps:
Step 1: detecting electrode is extend in sample and starts to detect, and the resonance detecting unit flows to the digital conversion unit by the voltage analog signal detected, and the digital conversion unit is calculated voltage analog signal, obtains the frequency response values curve;
Step 2: processing unit is processed the frequency response values curve, at 101～120 points of frequency response values curve up-sampling, the data that the curve sampling is obtained are as input data I nput(t), substitution non-linear stochastic resonance model calculates signal to noise ratio snr, and this non-linear stochastic resonance model algorithm is as follows:
ξ (t) is white Gaussian noise, and its auto-correlation connection function is: E[ξ (t) ξ (0)]=2D δ (t), a is input signal strength, f
0Be frequency modulating signal, D is noise intensity, and a, b are all real parameters, obtains signal to noise ratio (S/N ratio) to be:
S (ω) is signal spectral density, S
N(Ω) be the noise intensity in signal frequency range;
Get this signal to noise ratio (S/N ratio) peak of curve as the signal to noise ratio (S/N ratio) eigenwert;
Step 3: by signal to noise ratio (S/N ratio) eigenwert substitution milk sample water cut predictor formula:
Calculate the milk water cut.
9. a kind of SAWR according to claim 8 detects the method for adulterated milk, it is characterized in that described milk sample water cut predictor formula is calculated by following steps:
Get milk content and be respectively 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7 0.8,1.0 milk sample also is numbered, according to step 1 to two, respectively these milk samples are detected, obtain corresponding signal to noise ratio (S/N ratio) eigenwert, processing unit obtains prediction curve according to these milk sample content and signal to noise ratio (S/N ratio) eigenwert, and prediction curve is carried out to the relational expression that matching obtains signal to noise ratio (S/N ratio) and milk level
SNR＝-65.52727-17.67273Wk（R=
-0.99596）
Then conversion obtains milk sample water cut predictor formula.
10. a kind of SAWR according to claim 8 or claim 9 detects the method for adulterated oil, and it is characterized in that arranging the sample test environment temperature is 15～20 ℃.
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| CN105021670A (en) * | 2015-02-09 | 2015-11-04 | 浙江工商大学 | Apparatus and method for analyzing concentration of cycloheximide based on surface acoustic wave series resonator biological tongue |
| CN105021666A (en) * | 2015-02-09 | 2015-11-04 | 浙江工商大学 | Apparatus and method for detecting concentration of cycloheximide solution |
| CN105116026A (en) * | 2015-02-09 | 2015-12-02 | 浙江工商大学 | Analytical device and analytical method for quinine concentration based on surface acoustic wave in series with resonator biological tongue. |
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| CN105116026B (en) * | 2015-02-09 | 2018-03-09 | 浙江工商大学 | A kind of quinine concentration analysis device and method based on surface acoustic wave series resonator biology tongue |
| CN105021666B (en) * | 2015-02-09 | 2018-03-09 | 浙江工商大学 | A kind of cycloheximide solution concentration detector and method |
| CN105021670B (en) * | 2015-02-09 | 2018-08-07 | 浙江工商大学 | Cycloheximide concentration analysis device and method based on surface acoustic wave series resonator biology tongue |
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