CN202948069U - Measuring device for solution conductivity - Google Patents
Measuring device for solution conductivity Download PDFInfo
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- CN202948069U CN202948069U CN 201220633821 CN201220633821U CN202948069U CN 202948069 U CN202948069 U CN 202948069U CN 201220633821 CN201220633821 CN 201220633821 CN 201220633821 U CN201220633821 U CN 201220633821U CN 202948069 U CN202948069 U CN 202948069U
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Abstract
Disclosed is a measuring device for solution conductivity. The device comprises a sine wave generator, a power amplifying circuit, a conductive pool, a signal conditioning circuit, a current voltage power detection module, a computing and controlling unit and a human-computer interface, wherein the magnification times of the power amplifying circuit and the signal conditioning circuit are controlled to be adjusted by the computing and controlling unit, solutions to be tested of different conductivity in a wide range can be subjected to the conductivity measurement, the current voltage power detection module is used for detecting the effective value of the voltage exerted at two ends of the conductive pool, the effective value of the total current passing the conductive pool and the consumed power of the conductive pool, the computing and controlling unit conducts the computing so as to compute the voltage at two ends of the conductive pool and the phase difference of the total current passing the conductive pool, and the application of a phase sensitive detector is replaced. By the aid of the device, the electrode distributed capacitance can be measured dynamically, the effect of the electrode distributed capacitance and the electrode dual layer capacitance on the measurement is removed and the solution conductivity can be measured accurately.
Description
Technical field
The utility model relates to the measurement mechanism of electrical conductivity of solution, relates in particular to the measurement mechanism of the electrical conductivity of solution that adopts the current/voltage power detection module.
Background technology
The fundamental method of measurement of electrical conductivity of solution is the voltage U of measuring on the two ends that are applied to the electrode of inserting solution
DWith the electric current I that flows through electrode, calculate the resistance R=U between electrode
D/ I, with the conductivity of G=K/R calculating solution, wherein K is electrode constant.But the electrode of inserting in solution can produce polarization after energising, make the voltage U that records
DNot in fact the voltage at the two ends of solution own, but the electric double layer capacitance that is applied to solution resistance and relates to solution/metal electrode interface process is (hereinafter to be referred as the voltage on the virtual electronic device of these two series connection, so the formula R=U electric double layer capacitance of electrode)
DThere is theoretical error in/I; In order to reduce electrode polarization to the impact of accuracy of measurement, basic skills is the alternating current that applies the positive-negative polarity symmetry on electrode, but under ac-excited signal function, the electric current I that records not is the electric current that flows through merely solution, but flow through the total current of solution resistance branch circuit parallel connection distribution of electrodes electric capacity (comprising electrode interelectrode capacity, contact conductor electric capacity) branch road, therefore use ac-excited method but to introduce the impact of distribution of electrodes electric capacity on measuring when reducing the electrode polarization impact.
the research of adopting electrochemical analysis method to measure electrical conductivity of solution at present all uses resistance-capacitance network as the conductance cell equivalent physical model, and these resistance-capacitance networks as the conductance cell equivalent physical model mainly are divided into two classes, the first kind is with detected solution resistance distribution of electrodes electric capacity in parallel, this is better simply model, the research institute that is also most electrical conductivity of solution tests aspects relates to, Equations of The Second Kind for the electric double layer capacitance of the electrode of connecting with detected solution resistance after distribution of electrodes electric capacity in parallel again, this is relative complex and more unmanageable model, it is the conductance cell equivalent physical model that is fit to precision measurement.the problem that mainly solves for the research take first kind resistance-capacitance network as the conductance cell equivalent physical model is to eliminate the impact of distribution of electrodes electric capacity, obtained in this respect a large amount of achievements in research, have and adopt phase sensitive detection, the dynamic pulse method of adopting is arranged, the method of double pulse measurement is arranged, adopt in addition the bifrequency square wave excitation etc. method, these achievements in research have obtained positive effect, but because conductance cell equivalent physical model used is not taken into account the electric double layer capacitance of electrode, naturally also just ignored the impact of electric double layer capacitance on measuring of electrode, the impact of the electric double layer capacitance of electrode can not be ignored in precision measurement, even the capacitive reactance of the electric double layer capacitance of electrode only has 1% size of detected solution resistance, just because of this, be restricted for the research of the first kind resistance-capacitance network model development to more precision measurement.
Realize the precision measurement of electrical conductivity of solution, require links all accurate as far as possible, comprise: 1, the resistance-capacitance network model of simulation conductance cell principle of work must be more near truth, according to the achievement in research of electrochemical analysis aspect, above-mentioned Equations of The Second Kind model (namely with after the electric double layer capacitance of detected solution resistance series connection electrode distribution of electrodes electric capacity in parallel) again than first kind model (namely using detected solution resistance distribution of electrodes electric capacity in parallel) more near real conductance cell, more accurate; 2, the derivation of finding the solution mathematic(al) representation that is based upon on the resistance-capacitance network basis is accurate as far as possible, and is few approximate with preferably not existing; 3, mathematic(al) representation is that enclosed is found the solution rather than iterative as far as possible, mathematic(al) representation do not occur as far as possible denominator close to zero situation to avoid the amplification of error in numerical calculation; 4, carry out the numerical evaluation time error according to mathematic(al) representation as far as possible little; 5, the detection of electrode excitation signal and electrode response signal such as current value, magnitude of voltage, performance number equal error are as far as possible little.The 4th link is numerical evaluation theoretical category problem, specially refers to the input storage of numerical value and effective word length problem of calculating; The 5th link is the problem of circuit design aspect; The 1st ~ 3 environment is determined by overall plan, is the core of electrical conductivity of solution measurement scheme.At present also less based on the research of above-mentioned Equations of The Second Kind conductance cell equivalent physical model.The purpose of the utility model patent is based on the measurement mechanism that resolves electrical conductivity of solution with Equations of The Second Kind conductance cell equivalent physical model.
Summary of the invention
The purpose of this utility model is to provide a kind of electric double layer capacitance that can eliminate electrode and distribution of electrodes electric capacity (distribution of electrodes electric capacity comprises electrode interelectrode capacity and contact conductor electric capacity) dual factors to the solution electrical conductivity measuring device of the adverse effect measured.
The technical scheme that realizes above-mentioned purpose is: a kind of solution electrical conductivity measuring device, be comprised of sine-wave generator (10), power amplification circuit (20), conductance cell (30), signal conditioning circuit (40), current/voltage power detection module (50), computing and controller (60) and (70) 7 modules of man-machine interface, the function of each module and mutual connected mode are as follows:
Sine-wave generator (10) produces the sine wave signal of fixed frequency fixed amplitude, and exports sine wave signal to power amplification circuit (20);
The multiple of the control that power amplification circuit (20) is subjected to computing and controller (60) to determine the amplitude from the sine wave signal of sine-wave generator (10) is zoomed in or out carries out exporting conductance cell (30) to so that electrode is encouraged after power amplification to the sine wave signal after zooming in or out simultaneously;
Conductance cell (30) includes electrode and detected solution, and the electrode that includes receives from the pumping signal of power amplification circuit (20) and by its excitation, produces the electrode response signal and exports signal conditioning circuit (40) to;
Signal conditioning circuit (40) receives from the electrode response signal of conductance cell (30) and to the electrode response signal and carries out filtering and signal zooms in or out, filtering mode and signal zoom in or out the control that multiple is subjected to computing and controller (60), and the output of signal conditioning circuit (40) is connected to current/voltage power detection module (50);
The control that current/voltage power detection module (50) is subjected to computing and controller (60) is carried out electric current, voltage and power detection to the signal from signal conditioning circuit (40) and the result that will detect exports computing and controller (60) to;
The connection of computing and controller (60) and function comprise 7 aspects: a, power amplification circuit (20) are controlled the multiple that the amplitude from the sine wave signal of sine-wave generator (10) is zoomed in or out to determine; B, filtering mode and signal that signal conditioning circuit (40) is controlled to determine signal conditioning circuit (40) zoom in or out multiple; C, current/voltage power detection module (50) is controlled to determine the working method of current/voltage power detection module (50); D, receive the output signal from current/voltage power detection module (50); E, the signal from current/voltage power detection module (50) is carried out data operation process; F, the result of data calculation process is exported to man-machine interface (70) show; G, receive the input from man-machine interface (70);
Man-machine interface (70) is connected with computing and controller (60), comprises the function of two aspects: a, the result of processing from the data operation of computing and controller (60) is shown; B, the parameter that will arrange in the key-press input mode are sent into computing and controller (60).
Principle of the present invention:
Core concept of the present utility model has two, and one is that the enlargement factor of power amplification circuit (20) and signal conditioning circuit (40) can be regulated by the control of computing and controller (60) to make and can carry out conductivity measurement to the detected solution of the different conductivity of wide range; Another is the effective value that adopts current/voltage power detection module (50) to detect to put on conductance cell (30) both end voltage, the effective value of the total current by conductance cell (30) and the power that conductance cell (30) consumes, again by computing and controller (60) suitably computing can calculate the voltage at conductance cell (30) two ends and by the phase differential between the total current of conductance cell (30), substitute the application of phase-sensitive detector (PSD); Finally calculate the conductivity of detected solution by suitable mathematical model.
A kind of solution electrical conductivity measuring device of the present utility model is compared existing measuring method and had following beneficial effect: distribution of electrodes electric capacity can dynamic measurement, and its impact can be eliminated fully; The exciting signal frequency size is not had special requirement, can select arbitrarily in relative broad range; In the time of in there is polarization in electrode and is embodied in the conductance cell equivalent physical model with the electric double layer capacitance of electrode, can quantitatively count its impact, be the reference technique scheme of accurately measuring electrical conductivity of solution.
Description of drawings
Fig. 1 is the solution electrical conductivity measuring device structural drawing.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is further described:
A kind of solution electrical conductivity measuring device, be comprised of sine-wave generator (10), power amplification circuit (20), conductance cell (30), signal conditioning circuit (40), current/voltage power detection module (50), computing and controller (60) and (70) 7 modules of man-machine interface, the function of each module and mutual connected mode are as follows:
Sine-wave generator (10) produces the sine wave signal of fixed frequency fixed amplitude, and exports sine wave signal to power amplification circuit (20);
The multiple of the control that power amplification circuit (20) is subjected to computing and controller (60) to determine the amplitude from the sine wave signal of sine-wave generator (10) is zoomed in or out carries out exporting conductance cell (30) to so that electrode is encouraged after power amplification to the sine wave signal after zooming in or out simultaneously;
Conductance cell (30) includes electrode and detected solution, and the electrode that includes receives from the pumping signal of power amplification circuit (20) and by its excitation, produces the electrode response signal and exports signal conditioning circuit (40) to;
Signal conditioning circuit (40) receives from the electrode response signal of conductance cell (30) and to the electrode response signal and carries out filtering and signal zooms in or out, filtering mode and signal zoom in or out the control that multiple is subjected to computing and controller (60), and the output of signal conditioning circuit (40) is connected to current/voltage power detection module (50);
The control that current/voltage power detection module (50) is subjected to computing and controller (60) is carried out electric current, voltage and power detection to the signal from signal conditioning circuit (40) and the result that will detect exports computing and controller (60) to;
The connection of computing and controller (60) and function comprise 7 aspects: a, power amplification circuit (20) are controlled the multiple that the amplitude from the sine wave signal of sine-wave generator (10) is zoomed in or out to determine; B, filtering mode and signal that signal conditioning circuit (40) is controlled to determine signal conditioning circuit (40) zoom in or out multiple; C, current/voltage power detection module (50) is controlled to determine the working method of current/voltage power detection module (50); D, receive the output signal from current/voltage power detection module (50); E, the signal from current/voltage power detection module (50) is carried out data operation process; F, the result of data calculation process is exported to man-machine interface (70) show; G, receive the input from man-machine interface (70);
Man-machine interface (70) is connected with computing and controller (60), comprises the function of two aspects: a, the result of processing from the data operation of computing and controller (60) is shown; B, the parameter that will arrange in the key-press input mode are sent into computing and controller (60).
The term that above embodiment is used, symbol are not construed as limiting application of the present utility model, just for convenience of explanation.Those skilled in the art can make some replacements according to embodiment of the present utility model, yet these all equivalences of doing according to the utility model embodiment are replaced and are revised, and belong to invention thought of the present utility model and reach in the scope of the claims that is defined by claim.
Claims (1)
1. solution electrical conductivity measuring device, it is characterized in that by sine-wave generator (10), power amplification circuit (20), conductance cell (30), signal conditioning circuit (40), current/voltage power detection module (50), computing and controller (60) and man-machine interface (70) totally 7 modules form, wherein:
Described sine-wave generator (10) is connected with power amplification circuit (20);
Described power amplification circuit (20) is connected with conductance cell (30);
Described power amplification circuit (20) is connected with computing and controller (60);
Described conductance cell (30) includes electrode and detected solution, and the electrode response signal that the electrode that includes produces exports signal conditioning circuit (40) to;
The output of described signal conditioning circuit (40) is connected to current/voltage power detection module (50);
Described signal conditioning circuit (40) is connected with computing and controller (60);
Described current/voltage power detection module (50) concatenation operation and controller (60);
Described computing and controller (60) are connected with man-machine interface (70).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633821 CN202948069U (en) | 2012-11-26 | 2012-11-26 | Measuring device for solution conductivity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633821 CN202948069U (en) | 2012-11-26 | 2012-11-26 | Measuring device for solution conductivity |
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| CN202948069U true CN202948069U (en) | 2013-05-22 |
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| CN 201220633821 Expired - Fee Related CN202948069U (en) | 2012-11-26 | 2012-11-26 | Measuring device for solution conductivity |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588983A (en) * | 2014-11-14 | 2016-05-18 | 佛山市顺德区美的电热电器制造有限公司 | Test device for conductivity and electric equipment |
| CN105652096A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Testing apparatus of conductivity and electrical equipment |
| CN105651829A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Conductivity test device and electrical apparatus |
| CN105652092A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Testing apparatus of conductivity and electrical equipment |
| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN113125516A (en) * | 2021-04-01 | 2021-07-16 | 青岛盛瀚色谱技术有限公司 | Wide-range constant-temperature bipolar pulse conductance detector |
| CN113484370A (en) * | 2021-05-26 | 2021-10-08 | 浙江探芯科技有限公司 | Conductivity measurement method and equipment |
-
2012
- 2012-11-26 CN CN 201220633821 patent/CN202948069U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588983A (en) * | 2014-11-14 | 2016-05-18 | 佛山市顺德区美的电热电器制造有限公司 | Test device for conductivity and electric equipment |
| CN105652096A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Testing apparatus of conductivity and electrical equipment |
| CN105651829A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Conductivity test device and electrical apparatus |
| CN105652092A (en) * | 2014-11-14 | 2016-06-08 | 佛山市顺德区美的电热电器制造有限公司 | Testing apparatus of conductivity and electrical equipment |
| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN113125516A (en) * | 2021-04-01 | 2021-07-16 | 青岛盛瀚色谱技术有限公司 | Wide-range constant-temperature bipolar pulse conductance detector |
| CN113484370A (en) * | 2021-05-26 | 2021-10-08 | 浙江探芯科技有限公司 | Conductivity measurement method and equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20151126 |