CN103675460A - Measurement device of capacitive coupling type non-contact conductance based on phase-sensitive demodulation and method thereof - Google Patents
Measurement device of capacitive coupling type non-contact conductance based on phase-sensitive demodulation and method thereof Download PDFInfo
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Abstract
The invention discloses a measurement device of capacitive coupling type non-contact conductance based on phase-sensitive demodulation and a method thereof. The device comprises a sensor module, an alternating current excitation source, a signal processing module, a data acquisition module and a computer. The sensor is formed by an excitation electrode, an insulating pipe and a detection electrode. The signal processing module is formed by a current-voltage conversion module and a phase sensitive demodulation module. The alternating current excitation source provides a reference input signal, and when an alternating excitation signal is applied to the excitation electrode, the detection electrode discharges a weak current signal which reflects solution conductance information. The current-voltage conversion module converts the weak current signal into a voltage signal which is easily measured. The phase sensitive demodulation module demodulates the voltage into two paths of direct current voltage and calculates equivalent conductance and coupling capacitance between electrodes. According to the device and the method, the capacitance value of the equivalent coupling capacitance can be obtained, the measurement range of the conductance is enlarged, the measurement precision of the conductance is raised, and an effective way is provided for the solution of the measurement of the liquid conductivity in the pipe.
Description
Technical field
The present invention relates to electricity and lead detection technique, relate in particular to a kind of measurement mechanism and method of the capacity coupling non-contact conductance based on phase demodulation.
Background technology
Ducted liquid-phase system is extensively present in the industrial circles such as metallurgy, chemical, biological medicine, environmental protection and wastewater treatment.Conductivity is one of basic physical parameters of liquid, by the measurement to conductivity, not only can understand the conductive capability of liquid, can also obtain other characterisitic parameters of liquid, as concentration, liquid component, chemical reaction rate etc., these parameters are significant in commercial production.Exactly because a lot of characterisitic parameters of liquid all can be reflected as the variation of its conductivity, so the measurement of liquid electric conductivity is widely used and important Research Significance in research and production in pipeline.
Electrode conductivity mensuration because of its electrode structure relatively simple, cost is lower, measurement range extensively becomes a kind of general conductivity measuring method.Electrode conductivity mensuration can be divided into again two kinds of contact measurement and non-contact detection.Contact electricity is led detection and electrode need to be immersed in liquid, applies voltage on electrode, flows through electric current between electrode and the conductivity of fluid to be measured and is directly proportional, and obtains the numerical value of conductivity by measuring current value.Because electrode directly contacts with solution, easily there is the problems such as electrode polarization effect and galvanic corrosion in this mode, thus the accuracy that impact is measured, the serviceable life of shortening electrode.1998, Zemann etc. have proposed for the capacity coupling non-contact conductance measuring method on capillary channel with Fracassi da Silva philosophy, this non-contact electric conductivity measuring method is installed two ring electrodes that keep at a certain distance away at isolated pipe outer wall, be exciting electrode and detecting electrode, electrode and ducted solution form coupling capacitance, ducted conducting liquid is equivalent to resistance, and they have formed the equivalent electrical circuit of electric capacity-resistance-capacitance series connection jointly.When exciting electrode is applied to alternating voltage, detecting electrode just can obtain reflecting the alternating current of pipeline solution resistance size.This non-contact conductance measuring method has avoided electrode to contact with ducted solution, has made up contact method for measuring conductance and has had defect, thereby made this method receive increasing concern.
Existing capacity coupling non-contact conductance device is due to the impact of coupling capacitance, and the conductivity range that can measure is less, and resolution is not high, is not suitable for the measurement for the higher electrical conductivity of solution of concentration.
Summary of the invention
The object of the invention is to overcome the deficiency of current techniques, a kind of measurement mechanism and method stable, the capacity coupling non-contact conductance based on phase demodulation reliably are provided.
The measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation comprises conductivity sensor, signal generator, signal processing module, data acquisition module and computing machine, described conductivity sensor comprises insulation measurement pipeline, exciting electrode and detecting electrode, exciting electrode and detecting electrode are arranged on the outer wall of insulation measurement pipeline, exciting electrode is connected with signal generator, signal processing module comprises current-voltage modular converter and phase demodulation module, detecting electrode is connected with the current signal input end of signal processing module, the voltage signal output end of signal processing module is connected with the signal input part of data acquisition module, data acquisition module is connected with computing machine.Signal generator provides respectively homophase reference signal and orthogonal reference signal for two multipliers in phase demodulation module.
The described conductivity sensor based on phase demodulation detects equivalent electrical circuit: signal generator is formed the first coupling capacitance C of tested conducting solution in reference signal output terminal and exciting electrode, insulation measurement pipeline in the same way
x1one end connects, the first coupling capacitance C
x1the other end and the equivalent resistance R of conducting solution
xone end be connected, the equivalent resistance R of conducting solution
xthe other end and formed the second coupling capacitance C of the tested conducting solution in detecting electrode and insulation measurement pipeline
x2be connected.
Described signal processing module circuit comprises the first resistance R 1, the first operational amplifier A 1, the second operational amplifier A 2, the 3rd operational amplifier A 3, the first multiplier (V
ref0) M1, the second multiplier (V
ref90) M2, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4;
The inverting input of one end of the first resistance R 1 and the first operational amplifier A 1, current signal input end connects, the in-phase input end of the first operational amplifier A 1 is connected to the ground and connects, the other end of the output terminal of the first operational amplifier A 1 and the first resistance R 1, the positive Y input end Y1 of the first multiplier M1, the positive Y input end Y1 of the second multiplier M2 is connected, the positive X input end X1 of the first multiplier M1 is connected with the homophase reference signal output terminal of signal generator, the negative X input end X2 of the first multiplier M1, negative Y input end Y2 is connected with ground, the positive Y input end Y1 of the second multiplier M2 is connected with the orthogonal reference signal output terminal of signal generator, the negative X input end X2 of the second multiplier (M1), negative Y input end Y2 is connected with ground, the output terminal OUT of the first multiplier M1 is connected with one end of the second resistance R 2, the other end of the second resistance R 2, one end of the first capacitor C 1, one end of the 4th resistance R 4 is connected with the inverting input of the second operational amplifier A 2, the in-phase input end of the second operational amplifier A 2 is connected to the ground and connects, the output terminal of the second operational amplifier A 2, the other end of the first capacitor C 1, the other end of the 4th resistance R 4 is connected with one end of the 6th resistance R 6, the other end of the 6th resistance R 6 is by the 3rd capacitor C 3 ground connection, the output terminal OUT of the second multiplier M2 is connected with one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3, one end of the second capacitor C 2, one end of the 5th resistance R 5 is connected with the inverting input of the 3rd operational amplifier A 3, the in-phase input end of the 3rd operational amplifier A 3 is connected to the ground and connects, the output terminal of the 3rd operational amplifier A 3, the other end of the second capacitor C 2, the other end of the 5th resistance R 5 is connected with one end of the 7th resistance R 7, the other end of the 7th resistance R 7 is by the 4th capacitor C 4 ground connection.
The measuring method of the capacity coupling non-contact conductance based on phase demodulation comprises when exciting electrode is applied to ac-excited signal, detecting electrode flows out the low current signal that can reflect solution conductivity information, and current-voltage modular converter can convert this weak current to the voltage signal of easy measurement.Phase demodulation module is decomposed into in-phase component V by this voltage
0with quadrature component V
90, according to V
0and V
90, between electrode, equivalent resistance and coupling capacitance all can be calculated.
The measuring method of the capacity coupling non-contact conductance based on phase demodulation comprises: the method for utilizing phase demodulation, the alternating current that detecting electrode flows out, through current-voltage conversion circuit, be converted into alternating voltage, this voltage can be decomposed into in-phase component V after the phase demodulation module of multiplier and low-pass filter circuit composition
0with quadrature component V
90, according to V
0and V
90, between electrode, equivalent resistance and coupling capacitance all can be calculated.Can eliminate like this impact of coupling capacitance on conductance measurement, thereby enlarge measurement range improves resolution.
Signal generator provides the pumping signal V of exciting electrode
i, the first multiplier homophase reference signal V
ref0orthogonal reference signal V with the second multiplier
ref90, V
i, V
ref0with V
ref90be respectively
In formula, A
i, A
ref0and A
ref90be respectively V
i, V
ref0and V
ref90amplitude,
ωfor V
i, V
ref0and V
ref90angular frequency.
Coupling capacitance C
x1with coupling capacitance C
x2series value C
xfor
R
1for feedback resistance, V
outbe the output voltage of the first amplifier, comprise in-phase component and quadrature component two parts, can be expressed as
V
outalso can be write as
In formula, A
outfor V
outamplitude, θ is phase place
Accordingly, can obtain
The output signal of two multipliers is respectively
Can find out V
mUL0with V
mUL90comprise alternating component and flip-flop.By low-pass filtering, can obtain this flip-flop, therefore, DC voltage is
Finally, unknown R
xand C
xcan be calculated by following formula
The present invention compared with prior art has beneficial effect:
1) the conductance measurement new method based on phase demodulation can calculate electric conductivity value and coupling capacitance between electrode simultaneously, and in theory, the variation of conductivity and the linear proportional relation of the electric conductivity value obtaining.
2) this novel capacitor manifold type non-contact conductance measuring system can directly be separated the calculating of coupling capacitance and electric conductivity value, and coupling capacitance is not disturbed the calculating of electric conductivity value.The measurement performance of system as resolution, measurement range etc. be improved significantly.
3) compare with other capacity coupling non-contact conductance measuring methods, the method not only can improve the measurement performance of conductivity, can also obtain the information of coupling capacitance, contributes to scientific research personnel to further investigate fluid to be measured.
Accompanying drawing explanation
Fig. 1 is the structural representation of the measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation; Fig. 2 is that the conductivity sensor based on phase demodulation of the present invention detects equivalent circuit diagram;
Fig. 3 is signal processing module circuit diagram of the present invention;
Fig. 4 is experimental data chart of the present invention.
In figure: conductivity sensor 1, insulation measurement pipeline 2, exciting electrode 3, detecting electrode 4, signal generator 5, signal processing module 6, data acquisition module 7, computing machine 8.
Embodiment
As shown in Figure 1, the measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation comprises conductivity sensor 1, signal generator 5, signal processing module 6, data acquisition module 7 and computing machine 8, described conductivity sensor 1 comprises insulation measurement pipeline 2, exciting electrode 3 and detecting electrode 4, exciting electrode 4 and detecting electrode 4 are arranged on the outer wall of insulation measurement pipeline 2, exciting electrode 3 is connected with signal generator 5, signal processing module 6 comprises current-voltage modular converter and phase demodulation module, detecting electrode 4 is connected with the current signal input end of signal processing module 6, the voltage signal output end of signal processing module 6 is connected with the signal input part of data acquisition module 7, data acquisition module 7 is connected with computing machine 8.Signal generator 5 provides respectively homophase reference signal and orthogonal reference signal for two multipliers in phase demodulation module.
The described conductivity sensor based on phase demodulation detects equivalent electrical circuit: signal generator is formed the first coupling capacitance C of tested conducting solution in reference signal output terminal and exciting electrode, insulation measurement pipeline in the same way
x1one end connects, the first coupling capacitance C
x1the other end and the equivalent resistance R of conducting solution
xone end be connected, the equivalent resistance R of conducting solution
xthe other end and formed the second coupling capacitance C of the tested conducting solution in detecting electrode and insulation measurement pipeline
x2be connected.
Described signal processing module circuit comprises the first resistance R 1, the first operational amplifier A 1, the second operational amplifier A 2, the 3rd operational amplifier A 3, the first multiplier (V
ref0) M1, the second multiplier (V
ref90) M2, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4;
The inverting input of one end of the first resistance R 1 and the first operational amplifier A 1, current signal input end connects, the in-phase input end of the first operational amplifier A 1 is connected to the ground and connects, the other end of the output terminal of the first operational amplifier A 1 and the first resistance R 1, the positive Y input end Y1 of the first multiplier M1, the positive Y input end Y1 of the second multiplier M2 is connected, the positive X input end X1 of the first multiplier M1 is connected with the homophase reference signal output terminal of signal generator, the negative X input end X2 of the first multiplier M1, negative Y input end Y2 is connected with ground, the positive Y input end Y1 of the second multiplier M2 is connected with the orthogonal reference signal output terminal of signal generator, the negative X input end X2 of the second multiplier (M1), negative Y input end Y2 is connected with ground, the output terminal OUT of the first multiplier M1 is connected with one end of the second resistance R 2, the other end of the second resistance R 2, one end of the first capacitor C 1, one end of the 4th resistance R 4 is connected with the inverting input of the second operational amplifier A 2, the in-phase input end of the second operational amplifier A 2 is connected to the ground and connects, the output terminal of the second operational amplifier A 2, the other end of the first capacitor C 1, the other end of the 4th resistance R 4 is connected with one end of the 6th resistance R 6, the other end of the 6th resistance R 6 is by the 3rd capacitor C 3 ground connection, the output terminal OUT of the second multiplier M2 is connected with one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3, one end of the second capacitor C 2, one end of the 5th resistance R 5 is connected with the inverting input of the 3rd operational amplifier A 3, the in-phase input end of the 3rd operational amplifier A 3 is connected to the ground and connects, the output terminal of the 3rd operational amplifier A 3, the other end of the second capacitor C 2, the other end of the 5th resistance R 5 is connected with one end of the 7th resistance R 7, the other end of the 7th resistance R 7 is by the 4th capacitor C 4 ground connection.
The measuring method of the capacity coupling non-contact conductance based on phase demodulation comprises when exciting electrode is applied to ac-excited signal, detecting electrode flows out the low current signal that can reflect solution conductivity information, and current-voltage modular converter can convert this weak current to the voltage signal of easy measurement.Phase demodulation module is decomposed into in-phase component V by this voltage
0with quadrature component V
90, according to V
0and V
90, between electrode, equivalent resistance and coupling capacitance all can be calculated.
The measuring method of the capacity coupling non-contact conductance based on phase demodulation comprises: the method for utilizing phase demodulation, the alternating current that detecting electrode flows out, through current-voltage conversion circuit, be converted into alternating voltage, this voltage can be decomposed into in-phase component V after the phase demodulation module of multiplier and low-pass filter circuit composition
0with quadrature component V
90, according to V
0and V
90, between electrode, equivalent resistance and coupling capacitance all can be calculated.Can eliminate like this impact of coupling capacitance on conductance measurement, thereby enlarge measurement range improves resolution.
Signal generator provides the pumping signal V of exciting electrode
i, the first multiplier homophase reference signal V
ref0orthogonal reference signal V with the second multiplier
ref90, V
i, V
ref0with V
ref90be respectively
In formula, A
i, A
ref0and A
ref90be respectively V
i, V
ref0and V
ref90amplitude,
ωfor V
i, V
ref0and V
ref90angular frequency.
Coupling capacitance C
x1with coupling capacitance C
x2series value C
xfor
R
1for feedback resistance, V
outbe the output voltage of the first amplifier, comprise in-phase component and quadrature component two parts, can be expressed as
V
outalso can be write as
In formula, A
outfor V
outamplitude, θ is phase place
Accordingly, can obtain
The output signal of two multipliers is respectively
Can find out V
mUL0with V
mUL90comprise alternating component and flip-flop.By low-pass filtering, can obtain this flip-flop, therefore, DC voltage is
Finally, unknown R
xand C
xcan be calculated by following formula
On the horizontal glass pipeline that the KCl solution that has utilized variable concentrations is 3.0mm at internal diameter, the mentioned apparatus and method of the present invention and traditional capacity coupling non-contact conductance measuring system have been carried out to experiment contrast.Experimental result as shown in Figure 4, the output voltage of traditional capacity coupling non-contact conductance measuring system changes more obvious within the scope of conductivity 0～1.6S/m, but when conductivity surpasses after 1.6S/m, output voltage values is almost constant, and adopts the capacity coupling non-contact conductance measuring system of phase demodulation technology in the scope of conductivity 0～8S/m, to have good variation.Experimental result shows, adopts capacity coupling non-contact conductance measuring system measurement range and the resolution of phase demodulation technology to be improved significantly.
Claims (4)
1. the measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation comprises conductivity sensor, signal generator, signal processing module, data acquisition module and computing machine, it is characterized in that: described conductivity sensor comprises insulation measurement pipeline, exciting electrode and detecting electrode, exciting electrode and detecting electrode are arranged on the outer wall of insulation measurement pipeline, exciting electrode is connected with signal generator, signal processing module comprises current-voltage modular converter and phase demodulation module, detecting electrode is connected with the current signal input end of signal processing module, the voltage signal output end of signal processing module is connected with the signal input part of data acquisition module, data acquisition module is connected with computing machine, signal generator provides respectively homophase reference signal and orthogonal reference signal for two multipliers in phase demodulation module.
2. the measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation according to claim 1, is characterized in that: the described conductivity sensor based on phase demodulation detects equivalent electrical circuit and is: signal generator is formed the first coupling capacitance C of tested conducting solution in reference signal output terminal and exciting electrode, insulation measurement pipeline in the same way
x1one end connects, the first coupling capacitance C
x1the other end and the equivalent resistance R of conducting solution
xone end be connected, the equivalent resistance R of conducting solution
xthe other end and formed the second coupling capacitance C of the tested conducting solution in detecting electrode and insulation measurement pipeline
x2be connected.
3. the measurement mechanism of the capacity coupling non-contact conductance based on phase demodulation according to claim 1, is characterized in that: described signal processing module circuit comprises the first resistance R 1, the first operational amplifier A 1, the second operational amplifier A 2, the 3rd operational amplifier A 3, the first multiplier (V
ref90) M1, the second multiplier (V
ref90) M2, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4;
The inverting input of one end of the first resistance R 1 and the first operational amplifier A 1, current signal input end connects, the in-phase input end of the first operational amplifier A 1 is connected to the ground and connects, the other end of the output terminal of the first operational amplifier A 1 and the first resistance R 1, the positive Y input end Y1 of the first multiplier M1, the positive Y input end Y1 of the second multiplier M2 is connected, the positive X input end X1 of the first multiplier M1 is connected with the homophase reference signal output terminal of signal generator, the negative X input end X2 of the first multiplier M1, negative Y input end Y2 is connected with ground, the positive Y input end Y1 of the second multiplier M2 is connected with the orthogonal reference signal output terminal of signal generator, the negative X input end X2 of the second multiplier (M1), negative Y input end Y2 is connected with ground, the output terminal OUT of the first multiplier M1 is connected with one end of the second resistance R 2, the other end of the second resistance R 2, one end of the first capacitor C 1, one end of the 4th resistance R 4 is connected with the inverting input of the second operational amplifier A 2, the in-phase input end of the second operational amplifier A 2 is connected to the ground and connects, the output terminal of the second operational amplifier A 2, the other end of the first capacitor C 1, the other end of the 4th resistance R 4 is connected with one end of the 6th resistance R 6, the other end of the 6th resistance R 6 is by the 3rd capacitor C 3 ground connection, the output terminal OUT of the second multiplier M2 is connected with one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3, one end of the second capacitor C 2, one end of the 5th resistance R 5 is connected with the inverting input of the 3rd operational amplifier A 3, the in-phase input end of the 3rd operational amplifier A 3 is connected to the ground and connects, the output terminal of the 3rd operational amplifier A 3, the other end of the second capacitor C 2, the other end of the 5th resistance R 5 is connected with one end of the 7th resistance R 7, the other end of the 7th resistance R 7 is by the 4th capacitor C 4 ground connection.
4. the measuring method of the capacity coupling non-contact conductance based on phase demodulation, it is characterized in that: the method for utilizing phase demodulation, the alternating current that detecting electrode flows out, through current-voltage conversion circuit, be converted into alternating voltage, this voltage can be decomposed into in-phase component V after the phase demodulation module of multiplier and low-pass filter circuit composition
0with quadrature component V
90, according to V
0and V
90, between electrode, equivalent resistance and coupling capacitance all can be calculated; Can eliminate like this impact of coupling capacitance on conductance measurement, thereby enlarge measurement range improves resolution;
Signal generator provides the pumping signal V of exciting electrode
i, the first multiplier homophase reference signal V
ref0orthogonal reference signal V with the second multiplier
ref90, V
i, V
ref0with V
ref90be respectively
In formula, A
i, A
ref0and A
ref90be respectively V
i, V
ref0and V
ref90amplitude,
ωfor V
i, V
ref0and V
ref90angular frequency;
Coupling capacitance C
x1with coupling capacitance C
x2series value C
xfor
R
1for feedback resistance, V
outbe the output voltage of the first amplifier, comprise in-phase component and quadrature component two parts, can be expressed as
V
outalso can be write as
In formula, A
outfor V
outamplitude, θ is phase place
Accordingly, can obtain
The output signal of two multipliers is respectively
Can find out V
mUL0with V
mUL90comprise alternating component and flip-flop; By low-pass filtering, can obtain this flip-flop, therefore, DC voltage is
Finally, unknown R
xand C
xcan be calculated by following formula
。
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| CN109962680A (en) * | 2019-03-21 | 2019-07-02 | 西安联飞智能装备研究院有限责任公司 | A kind of non-phase-sensitive demodulating circuits and demodulation method |
| CN109962680B (en) * | 2019-03-21 | 2023-05-30 | 西安联飞智能装备研究院有限责任公司 | Non-phase-sensitive demodulation circuit and demodulation method |
| CN111044581A (en) * | 2019-12-28 | 2020-04-21 | 上海交通大学 | Gear-shifting large-range capacitive coupling type non-contact conductivity measuring device and method |
| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋系统有限公司 | Conductivity signal acquisition circuit and testing device |
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