CN105021667B - Citric acid concentration analytical equipment and method based on surface acoustic wave series resonator biology tongue - Google Patents
Citric acid concentration analytical equipment and method based on surface acoustic wave series resonator biology tongue Download PDFInfo
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- CN105021667B CN105021667B CN201510066343.2A CN201510066343A CN105021667B CN 105021667 B CN105021667 B CN 105021667B CN 201510066343 A CN201510066343 A CN 201510066343A CN 105021667 B CN105021667 B CN 105021667B
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Abstract
The present invention relates to a kind of citric acid concentration analytical equipments and method based on surface acoustic wave series resonator biology tongue.It solves the problems, such as existing of high cost using concentration analyzer.Device includes collecting work platform, collecting unit, converting unit and processing unit, collecting work platform includes pedestal, disk is provided on pedestal, multiple liquid storage cylinders are provided on disk, one side lower part of disk is provided with drip chamber, drip chamber bottom is provided with liquid droping head, it is provided with placing groove on the lower section pedestal of liquid droping head, collecting unit includes cell electrode plate and SAW resonator, cell electrode plate is located in placing groove, SAW resonator is connect with converting unit, and converting unit is connect with processing unit.It is an advantage of the invention that simple in structure, low manufacture cost, can automatically be detected a variety of solution concentrations, it is easy to operate, while reducing operating personnel's workload, save the time.Detection process is convenient and efficient, and precision is high.
Description
Technical field
The present invention relates to a kind of solution concentration detection technologies, are given birth to based on surface acoustic wave series resonator more particularly, to one kind
The citric acid concentration analytical equipment of object tongue, and the citric acid concentration analysis side based on surface acoustic wave series resonator biology tongue
Method.
Background technology
It is frequently necessary to be detected the concentration of solution in the lab, when detecting solution concentration, usually using special
Concentration analyzer detection, but concentration analyzer is expensive, few then be also required to members up to ten thousand, and this considerably increases experimental costs.
Therefore, it is necessary to design it is a kind of simple in structure, it is swift to operate, low-cost concentration detection apparatus and the detection device
Detection method.
Invention content
The present invention is mainly to solve the problems, such as to use concentration analyzer of high cost in the prior art, provides a kind of structure letter
It is single, swift to operate, the citric acid concentration analytical equipment at low cost based on surface acoustic wave series resonator biology tongue.
The present invention also provides a kind of citric acid concentrations swift to operate based on surface acoustic wave series resonator biology tongue
Analysis method.
The above-mentioned technical problem of the present invention is mainly to be addressed by following technical proposals：One kind being based on surface acoustic wave
The citric acid concentration analytical equipment of series resonator biology tongue, including collecting work platform, collecting unit, converting unit and processing are single
Member, the collecting work platform includes pedestal, and rotary setting has disk on pedestal, and the center of circle is provided with multiple liquid storages on disk
Chamber is provided with drip chamber in one side lower part of disk, and the drip chamber top is in contact with disk bottom, is arranged in fluid reservoir bottom
There is liquid outlet, the first solenoid valve is provided on liquid outlet, liquid outlet position is corresponded at the top of drip chamber and is provided with inlet, institute
It states and is provided with liquid droping head on drip chamber bottom, wiper mechanism and drainage mechanism are provided in drip chamber, in the lower square block of liquid droping head
Placing groove is provided on body, the collecting unit includes the cell electrode plate and SAW resonator being connected, cell electrode
Plate is located in placing groove, and the SAW resonator is connect with converting unit, and converting unit is connect with processing unit.This hair
Bright collecting work platform automatically drips to various concentration solution on cell electrode plate respectively to be detected, SAW resonator acquisition
Reaction information on cell electrode plate is output to converting unit in the form of frequency and turned, and converting unit acquires SAW resonator
Frequency signal, and be converted into digital signal and be sent to processing unit, processing unit carries out resonance to digital signal and handles to obtain
Output signal-to-noise ratio value.Output signal-to-noise ratio value corresponding with N number of digital signal is obtained after being detected to various concentration solution, so
Solution concentration prediction model is obtained according to fitting a straight line afterwards.A variety of strength solutions can be placed on disk, and according to setting every one
The section time rotates and a liquid storage luminal solution is added in drip chamber.Drip chamber drips to solution on cell electrode plate,
Surplus solution can be discharged after a kind of detection of strength solution and drip chamber can be cleaned.The present invention can be automatically to different dense
The concentration of degree solution is analyzed, simple to operate, is waited for side always without operating personnel and is replaced detection solution manually,
Operating personnel's workload is alleviated, the time has been saved.Drip chamber of the present invention has cleaning function, is arranged when by a kind of solution of concentration
After going out, wiper mechanism can be passed through water and be cleaned, and is passed through gas and dried up, and ensure that another strength solution enters dropping liquid
It will not be mixed with remaining liq before when room so that will not changing for solution concentration ensure that the essence of ultimate analysis data
True property.
As a preferred embodiment, the wiper mechanism includes the water inlet and air inlet being connected to drip chamber inside, into
The mouth of a river is connect with water tank, and air inlet is connect with air pump, and entering water electromagnetic valve and air inlet are respectively arranged on water inlet and air inlet
Solenoid valve, the drainage mechanism include the discharge outlet being arranged in drip chamber bottom, and drain solenoid valve is provided in discharge outlet.Clearly
Washing machine structure cleans drip chamber.Discharge outlet is opened when cleaning, being passed through clear water by water inlet carries out water cleaning, after water cleaning
Air is passed through to being dried in drip chamber by air inlet, this makes the solution being added later mixed with Liquid Residue before
It closes so that solution concentration will not change, and ensure the accuracy of analysis result.
As a preferred embodiment, the liquid droping head is connected by micro pump with drip chamber.By micro pump by dropping liquid
Indoor solution is dropped according to set amount and time on cell electrode plate.
As a preferred embodiment, oxygenation rabbling mechanism is provided in drip chamber, oxygenation rabbling mechanism includes shaft, is turned
Pipeline is provided in axis, the shaft is connected with water inlet and air inlet, is connected with stirring pipe in shaft, in stirring pipe
Meta position, which installs, is equipped with shaft seat, and stirring pipe, according in shaft, constitutes T-type structure, stirring pipe is hollow seal by shaft seat
Pipe, stirring pipe are connected with shaft, several first stomatas are provided on end one end of stirring pipe, in the other end of stirring pipe
Head is provided with several second stomatas on the side opposite with the first stomata.It is indoor that air is passed into dropping liquid by oxygenation rabbling mechanism
In solution, increase the oxygen content of solution, while being passed through air can drive stirring pipe to be rotated, and can be stirred to solution,
So that solution is preferably mixed with air, increases oxygen content, after such solution drips on cell electrode plate, cell electrode plate can be made
On cell survival it is more preferable, survive longer life expectancy, ensure that the accuracy of detection data.
As a preferred embodiment, circle limit edge is provided on the lower edge of the disk side, in the dropping liquid ceiling
Limited block is provided in portion, limited block surface is arcwall face, and limited block surface is affixed closely with disk side, on limited block surface
It is correspondingly arranged on limiting slot, limit edge is embedded in limiting slot.Limit edge and limiting slot ensure that disk is in contact with drip chamber, circle
Disk does not deviate by position when rotating so that liquid outlet is aligned with inlet.
As a preferred embodiment, each liquid storage cylinder position is corresponded on the disk side and be provided with ball, limiting
Block surface is correspondingly arranged on card slot ball and is embedded in disk side, and ball exposed portion is in contact with limited block surface, in this way
Disk rotated under ball effect it is more smooth, while disc rotary in place when, ball is just embedded in card slot, and it is fixed to be formed
Position so that liquid outlet can be more preferably aligned with inlet.
As a preferred embodiment, working electrode is provided on the cell electrode plate, to electrode and two reference electricity
The front end of pole, the working electrode is circle, which is made of foam copper, and is also coated with one on these foam coppers
Layer Gold plated Layer, cell are attached on working electrode front end, and the front end to electrode and reference electrode surrounds working electrode front end
Setting, and one layer of painting layer is coated on working electrode, the front end outer portion to electrode and reference electrode.Electrode is using bubble
Foam copper is equally distributed three-dimensional netted pore structure at, foam copper, the reticular structure with multi-layer stable and is completely embedded,
Reticular structure is unlikely to deform and collapses.This enables cell to enter foam copper inside configuration so that cell can preferably adhere to
On the electrode.Gold plated Layer is lower compared to foam Copper electrodissolution, is contacted with cell so that cell activity is more preferable, but also detection sensitivity
More preferably.
As a preferred embodiment, described erect on pedestal is provided with electric rotating machine, and the disk is mounted on electric rotating
In the shaft of machine, axle sleeve is provided with outside electric rotating machine shaft, the drip chamber is fixed on axle sleeve.
A kind of citric acid concentration analysis method based on surface acoustic wave series resonator biology tongue, includes the following steps：
Step 1：Citric acid solution is placed in liquid storage cylinder opposite with drip chamber in disk, it then will be in liquid storage cylinder
Solution injects drip chamber；Liquid storage cylinder is opposite with drip chamber, i.e. the liquid outlet of fluid reservoir and the inlet of drip chamber aligns.
Step 2：By micro pump on cell electrode plate dropping liquid, each dropping liquid amount is set as 0.05ml, when dropping liquid interval
Between be 3.6 seconds, dropping liquid number be 160 times, after dropping liquid, be discharged drip chamber in surplus solution and to drip chamber carry out cleaning blow
It is dry；Drain solenoid valve is opened, the indoor surplus solution of dropping liquid is discharged, drain solenoid valve is closed after discharge.Then water inlet is opened
Solenoid valve is passed through clear water, and opening drain solenoid valve again to being rinsed in drip chamber, after cleaning is drained.Close water inlet electromagnetism
Valve opens air inlet electromagnetic valve, is passed through gas to carrying out drying processing in drip chamber, finally closes drain solenoid valve.
Step 3：Signal on SAW resonator acquisition cell electrode plate exports in the frequency form, converting unit pair
Frequency signal carries out being converted to frequency curve, is then delivered on processing unit, processing unit is up-sampled in frequency curve
To input value S (t)；Input value S (t) is substituted into second-order linear system accidental resonance model, which is：
And second-order linearity coefficient accidental resonance model is made to resonate；Wherein x (t) is vibration particle displacement, and Ω is angular frequency, r
It is respectively the frequency of the attenuation coefficient and linear oscillator particle that set with ω, c is the signal adjustment coefficient of setting, and b is setting
Quadratic noise ξ2(t) coefficient, ξ (t) are three discrimination noises, and ξ (t) ∈ {-a, 0, a }, the dismutation of a ＞ 0, noise follow Poisson
Distribution, probability distribution ps(a)=ps(- a)=q, ps(0)=1-2q, wherein 0 ＜ q ＜ 0.5；Noise mean value is abided by with correlation
It follows<ξ(t)>=0,<ξ(t)ξ(t+τ)>=2qa2e-λτ；λ is correlation ratio, and the glacing flatness of three discrimination noise ξ (t) isObtain the output signal-to-noise ratio value of solution
Step 4：Output signal-to-noise ratio value is substituted into citric acid solution concentration prediction model：
Calculate the concentration of citric acid solution.
As a preferred embodiment, the citric acid solution concentration prediction model is calculated by following steps：
Step a：The citric acid solution of deployed a variety of concentration respectively, the liquid storage in disk is respectively put by citric acid solution
Intracavitary, while inputting in processor the concentration value k of corresponding each citric acid solution1, k2..., kN；N is the number for detecting solution
Amount.
Step b：Liquid storage luminal solution injection drip chamber opposite with drip chamber in disk is obtained according to step 2 and three
To the output signal-to-noise ratio value of solution；
Step c：Rotating circular disc keeps next liquid storage cylinder opposite with drip chamber, step b is repeated, in this way until institute on disk
There is solution to be all detected, last processor obtains corresponding to the output signal-to-noise ratio value SNR of these solution1, SNR2..., SNRN, so
Afterwards according to corresponding solution concentration k1, k2..., kN, utilize (k1, SNR1), (k2, SNR2) ..., (kN, SNRN) be fitted to directly
Line obtains citric acid solution concentration prediction model according to the straight line of fitting：
Therefore, it is an advantage of the invention that：Simple in structure, low manufacture cost can automatically examine a variety of solution concentrations
It surveys, it is easy to operate, while reducing operating personnel's workload, save the time.Detection process is convenient and efficient, and precision is high.
Description of the drawings
Attached drawing 1 is a kind of structural frames diagram of the present invention；
Attached drawing 2 is a kind of structural schematic diagram of collecting work platform in the present invention；
Attached drawing 3 is a kind of structural schematic diagram of oxygenation rabbling mechanism in the present invention；
Attached drawing 4 is a kind of structural schematic diagram of cell electrode plate in the present invention.
1- collecting work platform 2- collecting unit 3- converting unit 4- processing unit 5- SAW resonator 6- cells
Electrode plate 7- pedestal 8- disk 9- liquid storage cylinder 10- drip chamber 11- placing groove 12- liquid outlet 13- liquid outlet electromagnetic valves 14-
Inlet 15- liquid droping head 16- air inlet 17- air inlet electromagnetic valve 18- water inlet 19- entering water electromagnetic valve 20- discharge outlet
21- drain solenoid valve 22- electric rotating machine 23- axle sleeve 24- micro pump 25- shaft 26- stirring pipe 27- shaft seats 28-
One the second stomatas of stomata 29- 30- limits are along 31- working electrodes 32- to electrode 33- reference electrode 34- painting layers
35- limiting slot 36- ball 37- card slots
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment：
A kind of citric acid concentration analytical equipment based on surface acoustic wave series resonator biology tongue of the present embodiment, includes to adopt
Collect workbench 1, collecting unit 2, converting unit 3 and processing unit 4.
As shown in Fig. 2, collecting work platform includes pedestal 7, it is vertically-mounted on pedestal to have electric rotating machine 22, electric rotating machine
Shaft on be provided with disk 8, be provided with axle sleeve 23 outside the shaft of electric rotating machine.It is evenly arranged with around the center of circle on disk multiple
Liquid storage cylinder 9 for placing solution is provided with drip chamber 10 in the lower part of disk side, and drip chamber is fixedly connected on axle sleeve,
The top of drip chamber is in contact with disk bottom.Circle limit is provided on the lower edge of disk side along 30, at the top of drip chamber
On be provided with limited block, limited block surface is arcwall face, and limited block surface is affixed closely with disk side, right on limited block surface
It should be provided with limiting slot 35, limit edge is embedded in limiting slot.Each liquid storage cylinder position is corresponded on disk side is provided with rolling
Pearl 36, specific to be equipped with ball hole on liquid storage cylinder side wall, ball hole opening is less than inner cavity, and ball is stuck in ball hole,
It is equipped with spring between ball and ball hole bottom, card slot 37 is correspondingly arranged on limited block surface.
The bottom of liquid storage cylinder is provided with liquid outlet 12, liquid outlet electromagnetic valve 13 is provided on liquid outlet, in fluid reservoir
Top corresponds to liquid outlet position and is provided with inlet 14, and inlet diameter is more than liquid outlet diameter.It is set on the bottom of drip chamber
It is equipped with liquid droping head 15, micro pump 24 is provided on liquid droping head, by being connected inside micro pump and drip chamber.
It is provided with wiper mechanism and drainage mechanism in drip chamber, wiper mechanism includes water inlet 18 and air inlet 16, into
Gas port and water inlet converge into a pipeline then be connected inside drip chamber.Entering water electromagnetic valve 19 is provided on water inlet, into
The mouth of a river is connect by pipeline with water tank, and water pump is provided on pipeline.Be provided with air inlet electromagnetic valve 17 on air inlet, air inlet with
Air pump is connected.Drainage mechanism includes the discharge outlet 20 being arranged in drip chamber bottom, and drain solenoid valve is provided in discharge outlet
21。
Oxygenation rabbling mechanism is additionally provided in drip chamber, as shown in figure 3, oxygenation rabbling mechanism includes shaft 25, shaft
It is inside provided with pipeline, pipeline is connected with water inlet and air inlet in shaft, and stirring pipe 26 is connected in shaft, stirring pipe
Centre position is provided with shaft seat 27, and stirring pipe is mounted on by shaft seat in shaft, constitutes T-type structure, and stirring pipe is hollow
Seal pipe, stirring pipe are connected with shaft.Several first stomatas 28 are provided on end one end of stirring pipe, in stirring pipe
Several second stomatas 29 are provided on the side opposite with the first stomata of another end.
It is provided with placing groove 11 in liquid droping head lower base, places trench bottom and is provided with water outlet.
Collecting unit includes cell electrode plate 6 and SAW resonator 5, cell electrode plate connection sound surface packet resonator
On.When operation, cell electrode plate is placed in the placing groove of collecting work platform.As shown in Figure 1, SAW resonator and conversion
Unit is connected, and converting unit is connected with processing unit, and power supply is connected on SAW resonator.As shown in figure 4, cell
Working electrode 31 is provided on electrode plate, to electrode 32 and two reference electrodes 33.The front end of working electrode is circle, the circle
Part is made of foam copper, and one layer of Gold plated Layer is also coated on these foam coppers, and cell is attached on working electrode front end,
The front end of electrode and reference electrode is arranged around working electrode front end, and in working electrode, to electrode and reference electrode
One layer of painting layer 34 is coated on the outer portion of front end.
Based on the citric acid concentration analysis method of surface acoustic wave series resonator biology tongue, include the following steps：
Step 1：Citric acid solution is placed in liquid storage cylinder opposite with drip chamber in disk, it then will be in liquid storage cylinder
Solution injects drip chamber.
Step 2：By micro pump on cell electrode plate dropping liquid, each dropping liquid amount is set as 0.05ml, when dropping liquid interval
Between be 3.6 seconds, dropping liquid number be 160 times.After dropping liquid, drain solenoid valve is opened, the indoor surplus solution of dropping liquid is discharged,
Drain solenoid valve is closed after discharge.Then it opens entering water electromagnetic valve and is passed through clear water, to being rinsed in drip chamber, beaten again after cleaning
The water solenoid valve that begins to rehearse is drained.Entering water electromagnetic valve is closed, air inlet electromagnetic valve is opened, is passed through gas to being dried up in drip chamber
Processing, finally closes drain solenoid valve.
Step 3：Signal on SAW resonator acquisition cell electrode plate exports in the frequency form, converting unit pair
Frequency signal carries out being converted to frequency curve, is then delivered on processing unit, processing unit is up-sampled in frequency curve
To input value S (t)；Input value S (t) is substituted into second-order linear system accidental resonance model, which is：
And second-order linearity coefficient accidental resonance model is made to resonate；Wherein x (t) is vibration particle displacement, and Ω is angular frequency, r
It is respectively the frequency of the attenuation coefficient and linear oscillator particle that set with ω, c is the signal adjustment coefficient of setting, and b is setting
Quadratic noise ξ2(t) coefficient, ξ (t) are three discrimination noises, and ξ (t) ∈ {-a, 0, a }, the dismutation of a ＞ 0, noise follow Poisson
Distribution, probability distribution ps(a)=ps(- a)=q, ps(0)=1-2q, wherein 0 ＜ q ＜ 0.5；Noise mean value is abided by with correlation
It follows<ξ(t)>=0,<ξ(t)ξ(t+τ)>=2qa2e-λτ；λ is correlation ratio,ThreeThe glacing flatness of discrimination noise ξ (t) isObtain the output signal-to-noise ratio value of solution
Step 4：Output signal-to-noise ratio value is substituted into citric acid solution concentration prediction model：
Calculate the concentration of citric acid solution.
Wherein citric acid solution concentration prediction model is calculated by following steps：
Step a：The citric acid solution of deployed a variety of concentration respectively, the liquid storage in disk is respectively put by citric acid solution
Intracavitary, while inputting in processor the concentration value k of corresponding each citric acid solution1, k2..., KN；
Step b：Liquid storage luminal solution injection drip chamber opposite with drip chamber in disk is obtained according to step 2 and three
To the output signal-to-noise ratio value of solution；
Step c：Rotating circular disc keeps next liquid storage cylinder opposite with drip chamber, step b is repeated, in this way until institute on disk
There is solution to be all detected, last processor obtains corresponding to the output signal-to-noise ratio value SNR of these solution1, SNR2..., SNRN, so
Afterwards according to corresponding solution concentration K1, K2..., kN, utilize (k1, SNR1), (k2, SNR2) ..., (kN, SNRN) be fitted to directly
Line obtains citric acid solution concentration prediction model according to the straight line of fitting：
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although the terms such as collecting work platform, collecting unit, converting unit, processing unit are used more herein, simultaneously
It is not excluded for the possibility using other terms.The use of these items is only for more easily describe and explain the sheet of the present invention
Matter；Any one of the additional limitations is construed as all to disagree with spirit of that invention.
Claims (10)
1. a kind of citric acid concentration analytical equipment based on surface acoustic wave series resonator biology tongue, it is characterised in that：Including adopting
It includes pedestal (7) to collect workbench (1), collecting unit (2), converting unit (3) and processing unit (4), the collecting work platform,
Electric rotating machine (22) is vertically arranged on the pedestal, disk (8) is arranged in the shaft of electric rotating machine, around the center of circle on disk
Multiple liquid storage cylinders (9) are provided with, one side lower part of disk is provided with drip chamber (10), the drip chamber top and disk bottom phase
Contact, is provided with liquid outlet (12) in liquid storage cylinder bottom, liquid outlet electromagnetic valve (13) is provided on liquid outlet, at the top of drip chamber
Corresponding liquid outlet position is provided with inlet (14), and liquid droping head (15) is provided on the drip chamber bottom, is arranged in drip chamber
There are wiper mechanism and drainage mechanism, placing groove (11) is provided on the lower section pedestal of liquid droping head, the collecting unit includes phase
The cell electrode plate (6) and SAW resonator (5) of connection, cell electrode plate are located in placing groove, the surface acoustic wave
Resonator is connect with converting unit, and converting unit is connect with processing unit.
2. the citric acid concentration analytical equipment according to claim 1 based on surface acoustic wave series resonator biology tongue,
It is characterized in that water inlet (18) and air inlet (16) that the wiper mechanism includes and is connected to inside drip chamber, water inlet connect with water tank
It connects, air inlet is connect with air pump, and entering water electromagnetic valve (19) and air inlet electromagnetic valve are respectively arranged on water inlet and air inlet
(17), the drainage mechanism includes the discharge outlet (20) being arranged in drip chamber bottom, and drain solenoid valve is provided in discharge outlet
(21)。
3. the citric acid concentration analytical equipment according to claim 1 based on surface acoustic wave series resonator biology tongue,
It is characterized in that the liquid droping head (15) is connected by micro pump (24) with drip chamber (10).
4. the citric acid concentration analytical equipment according to claim 2 based on surface acoustic wave series resonator biology tongue,
It is characterized in being provided with oxygenation rabbling mechanism in drip chamber (10), oxygenation rabbling mechanism includes shaft (25), is provided in shaft
Pipeline, the shaft are connected with water inlet (18) and air inlet (16), and stirring pipe (26) is connected in shaft, stirring pipe
Centre position is provided with shaft seat (27), and stirring pipe is mounted on by shaft seat in shaft, constitutes T-type structure, and stirring pipe is sky
Heart seal pipe, stirring pipe are connected with shaft, and several first stomatas (28) are provided on end one end of stirring pipe, are being stirred
Another end of pipe is provided with several second stomatas (29) on the side opposite with the first stomata.
5. the citric acid concentration according to claim 1 or 2 or 3 or 4 based on surface acoustic wave series resonator biology tongue point
Analysis apparatus pushes up it is characterized in that being provided with circle limit on the lower edge of the disk (8) side along (30) in the drip chamber (10)
Limited block is provided in portion, limited block surface is arcwall face, and limited block surface is affixed closely with disk side, on limited block surface
It is correspondingly arranged on limiting slot (35), limit edge is embedded in limiting slot.
6. the citric acid concentration analytical equipment according to claim 5 based on surface acoustic wave series resonator biology tongue,
It is characterized in that each liquid storage cylinder position is corresponded on the disk side is provided with ball (36), is correspondingly arranged on limited block surface
Card slot (37).
7. the citric acid concentration according to claim 1 or 2 or 3 or 4 based on surface acoustic wave series resonator biology tongue point
Analysis apparatus, it is characterized in that being provided with working electrode (31) on the cell electrode plate (6), to electrode (32) and two reference electricity
The front end of pole (33), the working electrode is circle, which is made of foam copper, and is also plated on these foam coppers
There are one layer of Gold plated Layer, cell to be attached on working electrode front end, the front end to electrode and reference electrode surrounds working electrode
Front end is arranged, and one layer of painting layer (34) is coated on working electrode, the front end outer portion to electrode and reference electrode.
8. the citric acid concentration according to claim 1 or 2 or 3 or 4 based on surface acoustic wave series resonator biology tongue point
Analysis apparatus, it is characterized in that being provided with axle sleeve (23) outside electric rotating machine shaft, the drip chamber is fixed on axle sleeve.
9. a kind of citric acid concentration analysis method based on surface acoustic wave series resonator biology tongue is appointed using claim 1-8
Device in one, it is characterized in that including the following steps：
Step 1：Citric acid solution is placed in liquid storage cylinder opposite with drip chamber in disk, then by liquid storage luminal solution
Inject drip chamber；
Step 2：By micro pump on cell electrode plate dropping liquid, set each dropping liquid amount as 0.05ml, dropping liquid interval time is
3.6 seconds, dropping liquid number was 160 times, after dropping liquid, surplus solution in drip chamber is discharged and carries out cleaning drying to drip chamber；
Step 3：Signal on SAW resonator acquisition cell electrode plate exports in the frequency form, and converting unit is to frequency
Signal carries out being converted to frequency curve, is then delivered on processing unit, and processing unit up-samples to obtain defeated in frequency curve
Enter value S (t)；Input value S (t) is substituted into second-order linear system accidental resonance model, which is：
And second-order linearity coefficient accidental resonance model is made to resonate；Wherein x (t) is vibration particle displacement, and Ω is angular frequency, r and ω
The frequency of the attenuation coefficient and linear oscillator particle that respectively set, c are the signal adjustment coefficients of setting, and b is the secondary of setting
Noise ξ2(t) coefficient, ξ (t) are three discrimination noises, and the dismutation of ξ (t) ∈ {-a, 0, a }, a ＞ 0, noise follow Poisson point
Cloth, probability distribution ps(a)=ps(- a)=q, ps(0)=1-2q, wherein 0<q<0.5；Noise mean value is followed with correlation<ξ
(t)>=0,<ξ(t)ξ(t+τ)>=2qa2e-λτ；λ is correlation ratio, and the glacing flatness of three discrimination noise ξ (t) is
To the output signal-to-noise ratio value of solution
Step 4：Output signal-to-noise ratio value is substituted into citric acid solution concentration prediction model：
Calculate the concentration of citric acid solution.
10. the citric acid concentration analysis method according to claim 9 based on surface acoustic wave series resonator biology tongue,
It is characterized in that the citric acid solution concentration prediction model is calculated by following steps：
Step a：The citric acid solution of deployed a variety of concentration respectively, the liquid storage cylinder in disk is respectively put by citric acid solution
It is interior, while inputting in processor the concentration value k of corresponding each citric acid solution1,k2,...,kN；
Step b：Liquid storage luminal solution injection drip chamber opposite with drip chamber in disk is obtained molten according to step 2 and three
The output signal-to-noise ratio value of liquid；
Step c：Rotating circular disc keeps next liquid storage cylinder opposite with drip chamber, step b is repeated, in this way until all molten on disk
Liquid is all detected, and last processor obtains corresponding to the output signal-to-noise ratio value SNR of these solution1,SNR2,...,SNRN, then root
According to corresponding solution concentration k1,k2,...,kN, utilize (k1,SNR1),(k2,SNR2),...,(kN,SNRN) fitting be in line, root
Citric acid solution concentration prediction model is obtained according to the straight line of fitting：
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| US20040191918A1 (en) * | 2003-03-28 | 2004-09-30 | Sandrine Isz | Evaluation of bitterness of active drugs |
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| CN103424525A (en) * | 2013-03-18 | 2013-12-04 | 浙江工商大学 | Milk quality detection equipment and method |
| CN103412004A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Method for detecting storage time of citrus sinensis |
| CN103424440A (en) * | 2013-08-22 | 2013-12-04 | 浙江工商大学 | Device and method for online detection of water content of plant leaves |
| CN104089996A (en) * | 2014-01-17 | 2014-10-08 | 浙江工商大学 | Taste cell sensor using surface acoustic wave resonator and preparation method thereof |
| CN204044164U (en) * | 2014-06-23 | 2014-12-24 | 珠海森龙生物科技有限公司 | Mini-clinical biochemical analyzer |
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