CN103149441B - Be applied to portable Impedance Analysis instrument and the Impedance Analysis method of electrochemical measurement - Google Patents
Be applied to portable Impedance Analysis instrument and the Impedance Analysis method of electrochemical measurement Download PDFInfo
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Abstract
The invention discloses a kind of portable Impedance Analysis instrument being applied to electrochemical measurement, it mainly comprises: impedance analysis chip, and it for measuring the impedance data of gain coefficient and electro-chemical systems to be measured, and sends the result recorded to master controller; Feedback resistive network, it is for providing the feedback resistance of different gear and corresponding calibrated resistance to impedance analysis chip; Measure commutation circuit, for switching between the feedback resistance and calibrated resistance of multiple gear, also for switching between calibrated resistance and electro-chemical systems to be measured; Master controller, it opens the break-make with the second change-over switch for the first switching controlled in described measurement commutation circuit; Its data also recorded according to described impedance analysis chip calculate the impedance spectrum of described electro-chemical systems to be measured.The present invention changes feedback resistance gear by resistance-feedback network, realizes impedance value measurement scope significantly.
Description
Technical field
The invention belongs to electrochemical impedance spectroscopy analysis field, be specifically related to a kind of portable Impedance Analysis instrument and the analytical approach that are applied to electrochemical measurement.
Background technology
In the research process of chemical property, the method adopting measurement electrochemical impedance spectroscopy more.
Electrochemical impedance spectral method (ElectrochemicalImpedanceSpectroscopy is abbreviated as EIS) is a kind of electrochemical measuring method being disturbing signal with the sinusoidal wave electricity price (or electric current) of little amplitude.Owing to being with the electric signal of little amplitude to electrochemical system disturbance, can avoid producing large impact to system on the one hand, also make between disturbance and the response of system approximate linear on the other hand, this becomes simple with regard to making the mathematics manipulation of measurement result.Simultaneously, electrochemical impedance spectral method is again a kind of measuring method of frequency field, it carrys out Electrode system with the impedance spectrum measuring the frequency range that obtains very wide, thus can obtain the information of more dynamic information and electrode interface structure than the electrochemical method of other routines.
The interchange electromotive force ripple of the different little amplitude of frequency is applied to electro-chemical systems, measure the change of ratio (this ratio is the impedance of system) with sine wave freuqency ω of interchange electromotive force and current signal, or the phasing degree Φ of impedance is with the change of ω.The now frequency response function of electrode system is exactly electrochemical impedance.One group that records under a series of different frequency this frequency response function value is exactly then the electrochemical impedance spectroscopy of electrode system.
At present, the product that can carry out electrochemical impedance spectrometry on market has the equipment such as electrochemical workstation, frequency response analyzer, accurate LCR instrument.These equipment can carry out multifrequency point impedance measurement, and precision is high, and sophisticated software designs, but cost intensive, and bulky, be not easy to carry, design is complicated, uses loaded down with trivial details, and layman is difficult to left-hand seat and uses.Also have a class measuring equipment volume little, but function is poor, generally can only in a few or a frequency measurement impedance information, or the resistance value scope can measured is little, and analysis ability is weak, man-machine interaction inconvenience.
Summary of the invention
The object of this invention is to provide a kind of portable Impedance Analysis instrument and the analytical approach that are applied to electrochemical measurement, it is that it is simple to operate, quick, reliable for the electrochemical measurement of field level provides a kind of high performance scheme, the measurement mechanism of low cost and measuring method.
The invention provides a kind of portable Impedance Analysis instrument being applied to electrochemical measurement, it comprises:
Impedance analysis chip, it for measuring the impedance data of electro-chemical systems, and sends the data recorded to master controller;
Feedback resistive network, it is for providing the feedback resistance of different gear and corresponding calibrated resistance to impedance analysis chip;
Measure commutation circuit, it comprises the first change-over switch and the second change-over switch, switch between the feedback resistance of the first change-over switch for different gear in feedback resistive network, the second change-over switch is used for switching between calibrated resistance corresponding to the feedback resistance of current gear and electro-chemical systems to be measured;
Master controller, it opens the break-make with the second change-over switch for the first switching controlled in described measurement commutation circuit; Its data also recorded according to described impedance analysis chip calculate the impedance spectrum of described electro-chemical systems to be measured;
Wherein, during system calibration, described impedance analysis chip is connected with calibrated resistance from the feedback resistance under different gear respectively, for measuring the gain coefficient under different gear; In the systematic survey stage, described impedance analysis chip is connected with electro-chemical systems to be measured from the feedback resistance under different gear, for the impedance data of electro-chemical systems to be measured under measuring different gear, master controller, according to the gain coefficient under the impedance data of electro-chemical systems to be measured under described different gear and different gear, obtains the resistance value of electro-chemical systems to be measured.
Present invention also offers a kind of method of electro-chemical systems to be measured being carried out to Impedance Analysis, it comprises:
Step 1: successively by the feedback resistance of different gear and calibrated resistance termination analysis chip;
Step 2: impedance analysis chip under different gear feedback resistance, is measured corresponding calibrated resistance, obtained calibration data successively;
Step 3: calculate the gain coefficient under different gear feedback resistance according to described calibration data;
Step 4: successively by the feedback resistance of different gear and electro-chemical systems termination analysis chip to be measured;
Step 5: impedance analysis chip, successively under the feedback resistance of different gear, is measured electro-chemical systems to be measured, obtained measurement data;
Step 6: according to the gain coefficient under the identical gear feedback resistance calculated in described measurement data and step 3, the impedance data of described electro-chemical systems to be measured under calculating different gear feedback resistance;
Step 7: according to calculated electro-chemical systems impedance data to be measured and correspondingly feedback resistance compare, finally obtain the resistance value of electro-chemical systems to be measured.
Such scheme provided by the invention has the following advantages: change feedback resistance gear by resistance-feedback network, realize impedance value measurement scope significantly, main control is by arranging the initial frequency of impedance analysis chip, the parameters such as frequency increment and increment number carry out multifrequency point frequency sweep, portable Impedance Analysis instrument volume is little is suitable for field level for this, there is the control and prevention of disease field of real-time detection demand, the present invention is simultaneously simple to operate in research, fast, low cost, non-marked and non-invasive electrochemical measuring method and at analytical chemistry, materials chemistry, biological, medical science, clinical examination, technical analysis, the field such as environmental monitoring and agricultural analysis has huge application potential.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the portable Impedance Analysis instrument being applied to electrochemical measurement in the present invention;
Fig. 2 is middle impedance spectrometry principle schematic of the present invention;
Fig. 3 is feedback resistive network principle schematic in the present invention;
Fig. 4 is the process flow diagram of middle impedance spectral analysis method of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 shows in the present invention the structural representation of the portable Impedance Analysis instrument being applied to electrochemical measurement.As shown in Figure 1, the invention discloses a kind of portable Impedance Analysis instrument being applied to electrochemical measurement, it comprises:
Master controller 1, it makes system all parts in concert with work;
Output device 2, its input end is connected with the first output terminal of master controller 1, and it is for display system measurement processing result, and shown content is controlled by the output control signal of master controller;
Input equipment 3, its output terminal is connected with the first input end of master controller 1, user inputs systematic parameter when carrying out impedance measurement to electro-chemical systems to be measured by this input equipment 3 to master controller 1, described systematic parameter comprises spectral range and the spectral resolution of impedance spectrum when carrying out impedance measurement to electro-chemical systems to be measured, and other relevant parameter, as initial frequency, number of scan points and frequency increment etc.; Wherein, described frequency sweep is counted and is represented different frequency number of times for measuring.
Host interface 4, its input end is connected with the second output terminal of master controller 1, and its measurement data of system having been preserved is uploaded to host computer by host interface, computing machine or smart machine;
Impedance analysis chip 5, its first input end is connected with the second input end of master controller 1, for receiving systematic parameter when measuring electro-chemical systems to be measured from master controller 1, and the described systematic parameter received by utilizing sets the output frequency of pumping signal when measuring electro-chemical systems to be measured; And constantly change frequency by the initial frequency in systematic parameter and frequency increment etc., with the impedance measurement of electro-chemical systems to be measured under realizing frequency spectrum; Its second input end is connected with measurement commutation circuit 9; And connected in feedback resistive network 8 without the feedback resistance under gear by the change-over switch measured in commutation circuit 9, connect described electro-chemical systems to be measured or the calibrated resistance that arrange corresponding to the feedback resistance under be communicated with current gear simultaneously, to measure electro-chemical systems to be measured and the impedance measurement data of calibrated resistance under identical feedback resistance, and send described measurement data to master controller 1;
Power supply 6, its first output terminal is connected with the 3rd input end of master controller 1, and it is for providing power supply to master controller;
Switch driving circuit 7, its first input end is connected with the 3rd output terminal of master controller 1, second input end is connected with the second output terminal of power supply 6, and master controller 1 utilizes the low and high level of pin to realize the break-make of gauge tap driving circuit 7, and power supply 6 is powered for switch driving circuit 7; Switch driving circuit 7 provides driving voltage for measuring commutation circuit 9, to switch the break-make of each group switch in described measurement commutation circuit 9 according to the control of master controller 1;
Feedback resistive network 8, its measuring principle based on self-balancing bridge circuit method designs, it comprises the feedback resistance of multiple gear, and the feedback resistance correspondence of often kind of gear is provided with the equal calibrated resistance of a resistance value, and its input end is connected with the first output terminal measuring commutation circuit 9;
Measure commutation circuit 9, its first output terminal is connected with the input end of feedback resistive network 8, and the second output terminal is connected with the second input end of impedance analysis chip 5; It comprises the first change-over switch and the second change-over switch, first change-over switch comprises many groups, often organize the first change-over switch to be connected from the feedback resistance of the different gears in feedback resistive network 8, the second change-over switch is used for switching between electro-chemical systems to be measured or calibrated resistance; This measurement commutation circuit 9 is under the control of switch driving circuit 7, select the feedback resistance of the described different gear of access, and switch, to make their termination analysis chips 5 between simultaneously corresponding with feedback resistance under electro-chemical systems to be measured or this gear calibrated resistance; Change-over switch in this measurement commutation circuit 9 is conversion hysteria switch, can be relay switch or analog switch;
Electro-chemical systems reference voltage source 10 to be measured, its input end is connected with the second output terminal of power supply 6, its output terminal is connected with the 3rd input end of impedance analysis chip 5, and power supply 6 is powered for reference voltage source 10, and reference voltage source 10 provides reference voltage for impedance analysis chip 5.
Wherein, master controller 1, output device 2, input equipment 3, host interface 4, impedance analysis chip 5, reference voltage source 10, power supply 6 and switch driving circuit 7 form main control unit.
The present invention's change-over switch measured in commutation circuit 9 is realized by relay, also can be realized by the analog switch that conducting resistance is little.In one embodiment of the present invention, selective relay realizes, the corresponding feedback resistance gear of each relay.Feedback resistance under 6 different gears and the calibrated resistance corresponding with it have been shown in table 1, then now measure commutation circuit 9 and need 7 relays, wherein 6 relays are for switching the feedback resistance of 6 gears, another relay is used for switching between electro-chemical systems to be measured and calibrated resistance, as shown in FIG. 2 and 3.
Table 1 feedback resistive network gear sets
| R FB | Scope | Corresponding Vi input voltage |
| 1KΩ | ZMIN＝1KΩ | 2Vp-p |
| ZMAX＝3.3KΩ | 0.67Vp-p | |
| 3.3KΩ | ZMIN＝3.3KΩ | 2Vp-p |
| ZMAX＝10KΩ | 0.67Vp-p | |
| 10KΩ | ZMIN＝10KΩ | 2Vp-p |
| ZMAX＝33KΩ | 0.67Vp-p | |
| 33KΩ | ZMIN＝33KΩ | 2Vp-p |
| ZMAX＝100KΩ | 0.67Vp-p | |
| 100KΩ | ZMIN＝100KΩ | 2Vp-p |
| ZMAX＝330KΩ | 0.67Vp-p | |
| 330KΩ | ZMIN＝330KΩ | 2Vp-p |
| ZMAX＝1MΩ | 0.67Vp-p |
Fig. 2 shows the circuit theory diagrams between electro-chemical systems to be measured, impedance analysis chip 5, measurement commutation circuit 9 and feedback resistive network 8, wherein measure commutation circuit 9 and comprise relay J 7 and relay J 1-J6, relay J 7 is for switching electro-chemical systems to be measured and calibrated resistance, and relay J 1-J6 is for switching the feedback resistance under 6 gears, illustrate only a relay in the feedback resistance of a gear and relay J 1-J6 in Fig. 2, and Fig. 3 gives the concrete formation of 6 gear feedback resistances and relay J 1-J6.As shown in Figure 2, external feedback resistance and calibrated resistance are provided by described feedback resistive network 8, are the feedback resistance under a gear and corresponding calibrated resistance.Such as, in measuring process, when first selecting the impedance calibration of 1K Ω, must closing relay J1 and disconnection relay J 2 ~ J6, two short-circuit contact Vin and Vout of relay J 7 and two end points R of calibrated resistance simultaneously
sTD_a and R
sTD_when b is connected, represent that impedance analysis chip 5 is connected with corresponding calibrated resistance to 1K Ω feedback resistance, the gain coefficient of impedance during in order to measure access calibrated resistance, and by two end points Z of two of relay J 7 short-circuit contact Vin and Vout and electro-chemical systems to be measured
oUT_a and Z
oUT_when b is connected, in order to measure the impedance of electro-chemical systems to be measured.
Described 7 relays provide electric current by switch driving circuit 7, described switch driving circuit 7 comprises 7 triodes, the base stage of each triode is connected with 7 GPIO mouths of master controller 1, and the collector of each triode is connected respectively with described 7 relays, therefore, these 7 GPIO mouths of master controller individually control the break-make of a relay.
Master controller 1, during system calibration, first selects the calibrated resistance in feedback resistive network to be to be measured by the break-make of pilot relay J7, utilize be connected on Vin and Vout end between known calibration resistance to calculate the gain coefficient under different gear.During system calibration, in Fig. 3,6 relays only connect one at every turn, simultaneously two short-circuit contact Vin and Vout of relay J 7 respectively with R
sTD_aand R
sTD_bbe connected, then start impedance analysis chip 5 and carry out frequency sweeping, be recorded in the resistance value under ongoing frequency, frequency range can get 15KHz ~ 100KHz, and frequency increment can get 1KHz, in order to improve accuracy, again repeated test is carried out to each frequency, such as 20 times, and data are averaged, just obtain under 85 Frequency points 6 the different feedback resistance gain coefficients connected.
After having terminated system calibration, by pilot relay J7 break-make, calibrated resistance is switched to electro-chemical systems to be measured, namely two short-circuit contact Vin with Vout of relay J 7 are connected with ZDUT_a with ZDUT_b respectively, measure by method above, after data processing, the impedance spectrum distribution of electro-chemical systems to be measured can be obtained.Namely measured value during electro-chemical systems to be measured is accessed measured the feedback resistance of different gear by impedance analysis chip 5 under, the impedance of electro-chemical systems to be measured under obtaining different gear according to this measured value from the gain coefficient under different gear obtained above, namely 6 resistance values are obtained, and these 6 resistance values are compared with corresponding feedback resistance value, the highest resistance value of degree of closeness is as the resistance value of this electro-chemical systems to be measured.
Particularly, because the input range feeding back to the receiving end of impedance analysis chip 5 is 2Vp-p.The voltage Vin of input end can be expressed as:
Wherein, Vout is the output terminal VOUT voltage of the excitation sinusoidal signal of impedance analysis chip 5, R
fBfor feedback resistance, Z
dUTfor the impedance of electro-chemical systems to be measured, G is the gain of impedance analysis chip 5 internal amplification circuit.Master controller 1 passes through I
2c bus sets the amplitude Vout of output drive signal, the gain G of internal amplification circuit to impedance analysis chip 5.When Vout, G mono-timing, according to z
dUTsize adopt suitable R
fB, control within the input range of the receiving end VIN pin of impedance analysis chip 5 to make the receiver voltage signal Vin of impedance analysis chip 5.But, on the other hand, for a certain impedance z to be measured
dUT(Vout, G are certain), if R
fBthat selects is too small, then the enlargement factor in current-to-voltage converting circuit is improper, and this can make input signal Vin amplitude very little.Useful signal can not be amplified to the signal to noise ratio (S/N ratio) that suitable multiple will reduce useful signal, thus the accuracy that impact is measured.So, suitable feedback resistance R should be selected according to impedance to be measured
fB, Vin input voltage is controlled a rational scope.Feedback resistive network gear sets the scheme that can select, as shown in table 1.
As shown in table 1, be provided with altogether six gears, corresponding feedback resistance R
fBresistance is respectively 1K Ω, 3.3K Ω, 10K Ω, 33K Ω, 100K Ω and 330K Ω.For the electro-chemical systems to be measured of a certain the unknown, by selecting suitable R
fB, input signal Vin amplitude can be controlled in 2Vp-p scope.So both ensure that Vin can not exceed the input range of VIN pin, also ensure that and the signal to noise ratio (S/N ratio) of response signal will be caused to decline because Vin is too little.
Reference voltage source 10 of the present invention, for external power supply 9 is converted to 3.3V by 5V, improves the measuring accuracy of impedance analysis chip 5 to greatest extent.
Master controller 1 can select model STM32F103ZET6; Impedance analysis chip 5 can select model AD5933; Reference voltage source 10 can select model REF3033; The relay-type measured in commutation circuit 9 can select model TQ2-5V.
The invention also discloses and utilize the above-mentioned portable Impedance Analysis instrument being applied to electrochemical measurement to carry out carrying out electro-chemical systems to be measured the method for Impedance Analysis, it comprises the steps:
Step 1: by input equipment 3, inputs the systematic parameter of electro-chemical systems to be measured being carried out to impedance measurement to master controller 1, described systematic parameter comprises: carry out initial frequency, number of scan points and the frequency increment etc. when impedance spectrum is measured to electro-chemical systems to be measured;
Step 2: master controller 1 sends impedance analysis chip 5 systematic parameter to by bus, impedance analysis chip 5 utilizes the described systematic parameter received to control the output frequency, amplitude etc. of its output drive signal.Wherein, when measuring first, the output frequency of its pumping signal is set to the initial frequency of specifying in described systematic parameter, after each measurement completes, the output frequency of pumping signal is increased according to the frequency increment in described systematic parameter, then the measurement under next frequency is carried out, the impedance measurement of electro-chemical systems to be measured under finally realizing frequency spectrum;
Step 3: carry out system calibration.Master controller 1 is by gauge tap driving circuit 7, successively introduce the feedback resistance of the different gears in feedback resistive network 8, and the calibrated resistance corresponding with the feedback resistance of this gear is connected with described impedance analysis chip 5, the measurement data obtained under this gear is measured by impedance analysis chip 5.In measuring process, impedance analysis chip 5 emitting stage exports the pumping signal of setpoint frequency in step 2, this pumping signal is after described calibrated resistance, again through described feedback resistance, finally reenter the receiving end of impedance analysis chip 5, and by impedance analysis chip 5, discrete Fourier transformation is carried out to this entering signal and obtain real part word and imaginary part word, as the measurement data of this calibrated resistance.Because the calculating of gain coefficient is relevant with the size of feedback resistance, therefore by the feedback resistance under the different gear of access and its corresponding calibrated resistance, the gain coefficient under different feedback resistance gear can be recorded; ;
Step 4: impedance analysis chip 5 sends each obtained measurement data to master controller 1 by bus, then calculated the gain coefficient of feedback resistance under different gear by master controller 1, computing formula is as follows:
Step 5: master controller 1 is by gauge tap driving circuit 7, and the second change-over switch in handover measurement commutation circuit 9, makes impedance analysis chip 5 and described calibrated resistance disconnect, and be connected with described electro-chemical systems to be measured; The measurement data of impedance analysis chip 5 described electro-chemical systems to be measured under measuring the feedback resistance of different gear, and send by bus the measurement data at every turn obtained to master controller 1.Its measuring process is identical with the measuring process of Measurement and calibration resistance.
Step 6: master controller 1, according to the measurement data of the electro-chemical systems to be measured received from impedance analysis chip 5 and the gain coefficient that calculates in step 4, obtains resistance value; Calculating specific as follows:
Wherein, described imaginary part word and real part word be in step 5 obtain the measurement data of electro-chemical systems to be measured;
Step 7: the degree of closeness of the feedback resistance under the impedance of the electro-chemical systems to be measured recorded under master controller 1 more often kind of gear feedback resistance and corresponding gear, and using the resistance value of impedance the highest for degree of closeness as electro-chemical systems to be measured.Because the impedance of the size of feedback resistance more close to electro-chemical systems to be measured is more accurate, by successively measuring gain coefficient corresponding to different feedback impedance with the feedback resistance of different gear, and the impedance of electro-chemical systems to be measured is calculated according to the gain coefficient under different feedback impedance, and then the degree of closeness between relatively more measured electro-chemical systems to be measured and corresponding feedback resistance, select the resistance value of the highest feedback impedance of degree of closeness as described electro-chemical systems to be measured.Such as under a certain characteristic frequency, the practical impedance of electro-chemical systems to be measured is 20k Ω, carry out measuring and calculating with the feedback resistance of 1k Ω, 10k Ω and these three gears of 100k Ω respectively, finally obtain 3 resistance values, and the resistance value necessarily obtained under this feedback resistance gear of 10k Ω in these 3 resistance values is closest to the real impedance values of described electro-chemical systems to be measured, its result therefore should be adopted to be measurement result;
Step 8: according to the frequency increment in systematic parameter, impedance analysis chip 5 increases sweep frequency, and repeat above-mentioned steps, multiplicity N is number of scan points, with the resistance value of electro-chemical systems to be measured under measuring different frequency, and then obtain the impedance spectrum distribution of electro-chemical systems to be measured, complete Impedance Analysis.
Present invention employs master controller 1, output device 2 and keyboard 3 compounding practice and display, set initial frequency, number of scan points and frequency increment, send various control command by master controller, carry out control group analysis chip 5 by I2C signal and complete corresponding operation.What master controller 1 adopted is the STM32 family chip of ARM kernel, impedance analysis chip is by different calibrated resistances and feedback resistance and use DSP in sheet to calculate the impedance spectrum of electro-chemical systems to be measured, master controller 1 is fetched by I2C interface and is sent output device 2 to show after performing an analysis, and finally completes and measures the impedance spectrum of electro-chemical systems to be measured.In addition, host interface 4 can send the data recorded to PC, does the storage of further research or measurement data.
The present invention is applied to the portable Impedance Analysis instrument of electrochemical measurement, have employed the impedance analysis chip of high integration, and employs the requirement that Impedance feedback network meets impedance measurement scope, and the requirement of multifrequency point impedance measurement.The application of integrated impedance analysis chip and relevant circuit not only makes the cost of equipment obtain effectively to control, and has good performance in the precision of test result.External connection battery Power supply can also be used to make volume of the present invention little, easily the advantage such as portable.For the impedance measurement being applied to electrochemical element provides a kind of new departure.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. be applied to a portable Impedance Analysis instrument for electrochemical measurement, it comprises:
Impedance analysis chip, its first input end is connected with master controller, for receiving systematic parameter when measuring electro-chemical systems to be measured from master controller, and the described systematic parameter received by utilizing sets the output frequency of pumping signal when measuring electro-chemical systems to be measured; And constantly change frequency by the initial frequency in systematic parameter and frequency increment, with the impedance measurement of electro-chemical systems to be measured under realizing frequency spectrum; Its second input end is connected with measurement commutation circuit; And connect the feedback resistance in feedback resistive network under different gear by the first change-over switch measured in commutation circuit, connect described electro-chemical systems to be measured or the calibrated resistance corresponding with the feedback resistance under be communicated with current gear by the second change-over switch in described measurement commutation circuit simultaneously, to measure electro-chemical systems to be measured and the impedance measurement data of calibrated resistance under identical feedback resistance, and send described measurement data to master controller;
Feedback resistive network, it comprises the feedback resistance of multiple gear, for providing the feedback resistance of different gear and corresponding calibrated resistance to impedance analysis chip;
Measure commutation circuit, it comprises the first change-over switch and the second change-over switch, switch between the feedback resistance of the first change-over switch for different gear in feedback resistive network, the second change-over switch is used for switching between calibrated resistance corresponding to the feedback resistance of current gear and electro-chemical systems to be measured;
Master controller, it opens the break-make with the second change-over switch for the first switching controlled in described measurement commutation circuit; Its data also recorded according to described impedance analysis chip calculate the impedance spectrum of described electro-chemical systems to be measured;
Wherein, during system calibration, described impedance analysis chip is connected with calibrated resistance from the feedback resistance under different gear respectively, for measuring the gain coefficient under different gear; In the systematic survey stage, described impedance analysis chip is connected with electro-chemical systems to be measured from the feedback resistance under different gear, for the impedance data of electro-chemical systems to be measured under measuring different gear, master controller, according to the gain coefficient under the impedance data of electro-chemical systems to be measured under described different gear and different gear, obtains the resistance value of electro-chemical systems to be measured.
2. analyser as claimed in claim 1, it is characterized in that, described analyser, for measuring described electro-chemical systems to be measured resistance value at different frequencies, obtains the impedance spectrum of described electro-chemical systems to be measured under frequency spectrum to analyze.
3. analyser as claimed in claim 2, it is characterized in that, described analyser also comprises input equipment, and systematic parameter when analyzing the impedance spectrum of described electro-chemical systems to be measured for input measurement, described systematic parameter comprises initial frequency, number of scan points and frequency increment.
4. analyser as claimed in claim 1, it is characterized in that, described master controller is by measuring the break-make of change-over switch in commutation circuit described in electric current drived control.
5. analyser as claimed in claim 1, it is characterized in that, described first change-over switch and the second change-over switch are relay, and described first change-over switch comprises many groups, and described many groups the first change-over switch is connected with calibrated resistance from the feedback resistance of multiple different gear respectively.
6. analyser as claimed in claim 1, is characterized in that, under the data that described gain coefficient records when accessing calibrated resistance according to described impedance analysis chip and current gear, feedback resistance value calculates.
7. analyser as claimed in claim 1, is characterized in that, under the data that the resistance value of described electro-chemical systems to be measured records when accessing electro-chemical systems to be measured according to described impedance analysis chip and current gear, the gain coefficient of feedback resistance calculates.
8. analyser as claimed in claim 1, it is characterized in that, the feedback resistance of same gear is identical with the resistance value of calibrated resistance.
9. utilize the portable Impedance Analysis instrument described in claim 1 electro-chemical systems to be measured to be carried out to a method for Impedance Analysis, it comprises:
Step 1: successively by the feedback resistance of different gear and calibrated resistance termination analysis chip;
Step 2: impedance analysis chip under different gear feedback resistance, is measured corresponding calibrated resistance, obtained calibration data successively;
Step 3: calculate the gain coefficient under different gear feedback resistance according to described calibration data;
Step 4: successively by the feedback resistance of different gear and electro-chemical systems termination analysis chip to be measured;
Step 5: impedance analysis chip, successively under the feedback resistance of different gear, is measured electro-chemical systems to be measured, obtained measurement data;
Step 6: according to the gain coefficient under the identical gear feedback resistance calculated in described measurement data and step 3, the impedance data of described electro-chemical systems to be measured under calculating different gear feedback resistance;
Step 7: according to calculated electro-chemical systems impedance data to be measured and correspondingly feedback resistance compare, finally obtain the resistance value of electro-chemical systems to be measured.
10. method as claimed in claim 9, it is characterized in that, described method also comprises:
Step 8: the swept frequency increasing described impedance analysis chip, repeats step 1-7, obtains the resistance value of described electro-chemical systems to be measured under different frequency, with the Impedance Analysis result of electro-chemical systems to be measured under obtaining frequency spectrum.
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| CN104749438B (en) * | 2015-04-17 | 2017-11-10 | 中国人民解放军后勤工程学院 | A kind of differential type impedance spectrum detecting system and method |
| CN104914312B (en) * | 2015-06-18 | 2018-01-30 | 哈尔滨工业大学 | A kind of method for calculating the distribution of ac impedance spectroscopy relaxation time |
| CN109490368A (en) * | 2018-12-03 | 2019-03-19 | 海南大学 | A kind of electrochemical impedance measuring system based on wireless communication networks |
| CN110151204A (en) * | 2019-06-23 | 2019-08-23 | 复旦大学 | Wearable non-intrusion type bladder capacity monitoring alarm |
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| CN102508000A (en) * | 2011-10-24 | 2012-06-20 | 三江学院 | Electroencephalogram (EEG) neural signal detector impedance test and activation matching system |
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| US20120027058A1 (en) * | 2010-07-29 | 2012-02-02 | The Regents Of The University Of Michigan | Portable, wireless multi-channel impedance analyzer |
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| SU1148002A1 (en) * | 1983-03-09 | 1985-03-30 | Московский Областной Педагогический Институт Им.Н.К.Крупской | Device for measuring resistance of electrochemical resistors |
| CN101089621A (en) * | 2007-04-29 | 2007-12-19 | 中山大学 | Portable two-channel electrochemical analysing equipment |
| CN102508000A (en) * | 2011-10-24 | 2012-06-20 | 三江学院 | Electroencephalogram (EEG) neural signal detector impedance test and activation matching system |
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