CN105652095A - Conductivity test device and electrical equipment - Google Patents
Conductivity test device and electrical equipment Download PDFInfo
- Publication number
- CN105652095A CN105652095A CN201410649315.9A CN201410649315A CN105652095A CN 105652095 A CN105652095 A CN 105652095A CN 201410649315 A CN201410649315 A CN 201410649315A CN 105652095 A CN105652095 A CN 105652095A
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- test
- electrical conductivity
- test device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a conductivity test device and electrical equipment. The conductivity test device comprises a square wave generation source used for generating a square wave signal, a first filtering circuit which is connected with the square wave generation source and acquires a sinusoidal signal not including DC components, a test electrode unit which comprises at least three sets of test electrodes connected in parallel and is connected with the first filtering circuit, a current detection circuit used for detecting a current signal and converting the current signal into a corresponding voltage signal, a switch circuit which is connected between the test electrode unit and the current detection circuit, a frequency multiplication circuit connected with the current detection circuit, and a signal processing circuit which is connected with the frequency multiplication circuit and is used for determining conductivity of the to-be-tested medium according to the voltage signal processed through the frequency multiplication circuit. According to the conductivity test device, the test electrode can not only be prevented from being polarized, the conductivity of the to-be-tested medium can be accurately tested, but also demands of different test scenes can be satisfied.
Description
Technical field
The present invention relates to electrical conductivity technical field of measurement and test, in particular to a kind of electric conductivity test device and a kind of electrical equipment.
Background technology
Electrical conductivity as one of the key property of material, and simple with its Cleaning Principle, detecting device cost is low and is widely used in material classification technology, material analysis techniques, environmental protection technology and commercial production control technology.
In correlation technique, VA characteristic curve is typically with for the detection of electrical conductivity be analyzed, specifically, test electrode is applied voltage signal as pumping signal, the current signal of reading flow electrode after tested, determines the electrical conductivity of determinand according to above-mentioned voltage signal and current signal. But, according to d. c. voltage signal as continuous current excitation signal, can cause test polarization of electrode; If directly adopting ac voltage signal as ac-excited signal, then that the amplitude of ac-excited signal and the stability requirement of frequency is higher, and test polarization of electrode can be caused owing to ac-excited signal including flip-flop, the test result of ac-excited signal can not compatible with in digital circuit, therefore not providing the user electrical conductivity test result intuitively simultaneously. Additionally, for the material of high conductivity, owing to its resolution is relatively low, therefore cannot exactly it be tested.
Meanwhile, in some scenarios, as needed that in conductivity imaging field the electrical conductivity at medium multiple spot place is tested, if testing electrode only with one group or two groups, then needing the test position of changed test electrode frequently, causing that test is inconvenient, user operation is loaded down with trivial details; And need test electrode is carried out, test result otherwise can be caused inaccurate. Visible, adopt one group or two groups test electrode obviously can not meet the needs of test scene.
Therefore, how under avoiding the polarized premise of test electrode, exactly the electrical conductivity of material can be tested, and disclosure satisfy that different test scene need to become technical problem urgently to be resolved hurrily.
Summary of the invention
It is contemplated that at least solve one of technical problem of existence in prior art or correlation technique.
For this, it is an object of the present invention to propose a kind of can under the premise avoiding test electrode polarized, the electrical conductivity treating tested media exactly is tested, and disclosure satisfy that the test device of electrical conductivity that different test scene needs.
Further object is that and propose a kind of electrical equipment.
For achieving the above object, according to one embodiment of present invention, it is proposed that the test device of a kind of electrical conductivity, including: square wave occurring source, it is used for producing square-wave signal; First filter circuit, is connected to described square wave occurring source, and the described square-wave signal for described square wave occurring source is produced is filtered processing, and is not comprised the sinusoidal signal of flip-flop, using by described sinusoidal signal as test voltage; Test electrode unit, including at least three group test electrodes being connected in parallel, described test electrode unit is connected to described first filter circuit, for described test voltage is applied to medium to be tested; Current detection circuit, for detecting the current signal flowing through described test electrode unit, and is converted into corresponding voltage signal by the current signal detected; On-off circuit, is connected between described test electrode unit and described current detection circuit, is used for the duty of often group test electrode at least three groups test electrodes described in controlling; Frequency multiplier circuit, is connected to described current detection circuit, for described voltage signal is carried out process of frequency multiplication; Signal processing circuit, is connected to described frequency multiplier circuit, for determining the electrical conductivity of described medium to be tested according to the voltage signal after described frequency multiplier circuit processes.
The test device of electrical conductivity according to an embodiment of the invention, by the first filter circuit is connected to square wave occurring source, to be filtered described square-wave signal processing, finally obtain the sinusoidal signal without flip-flop, employing continuous current excitation signal in correlation technique can be avoided, or directly adopt the undressed ac-excited signal including flip-flop to cause polarization of electrode effect; Simultaneously as be by the sinusoidal signal that obtains after being filtered square-wave signal processing, therefore can ensure that be applied on electrode ac-excited has stable amplitude and frequency, and then may insure that the accuracy of electrical conductivity test result.
Additionally, by arranging on-off circuit to control the duty of often group test electrode, enhance the test multiformity of the test device of electrical conductivity, namely the simple switching of on-off circuit can be passed through, realize being treated tested media by different test electrodes to test, meet the needs of different test scene, as conductivity imaging field, it is achieved that the electrical conductivity of the difference treating tested media by least three group electrodes is tested. Preferably, at least three group test electrodes can only have one group of test electrode work at synchronization, produce interference between the signal of electrode tests to avoid at least three groups to test.
And due to when the impedance of the frequency of pumping signal, medium to be tested meets certain condition, the amplitude of voltage signal of current detection circuit output and the electrical conductivity of the medium to be tested monotonic increase relation in approximate direct ratio, therefore the voltage signal by arranging frequency multiplier circuit, current detection circuit exported carries out process of frequency multiplication, the electrical conductivity that can make measurement result and medium to be tested presents nearly quadratic relationship, and then is capable of the medium of high conductivity is measured accurately.
In addition, the present invention propose electrical conductivity test device less costly, facilitate implementation batch production and the application of the test device of electrical conductivity, realize the detection to water purifier water quality or the measurement for electrolyte, meat products, grain moisture content, the soil water are graded as being applied in water purifier.
It addition, the test device of electrical conductivity according to the abovementioned embodiments of the present invention, it is also possible to there is following additional technical characteristic:
According to one embodiment of present invention, described signal processing circuit, including: peak detection circuit, it is connected to described frequency multiplier circuit, for detecting the peak value of the voltage signal after described frequency multiplier circuit processes; Analog-digital converter, is connected to described peak detection circuit, carries out analog-to-digital conversion process for the peak value that described peak detection circuit is detected, to obtain digital signal; Microprocessor, is connected to described analog-digital converter, for determining the electrical conductivity of described medium to be tested according to described digital signal.
The test device of electrical conductivity according to an embodiment of the invention, by setting gradually peak detection circuit, analog-digital converter and microprocessor in signal processing circuit, it is possible to makes to test the conductivity value obtained and is compatible with digital circuit. Specifically, by analogue signal is quantified as digital signal, it is possible to use the electrical conductivity of test is checked at family more intuitively, improves Consumer's Experience.
According to one embodiment of present invention, described signal processing circuit, also include: the second filter circuit, described peak detection circuit is connected to described frequency multiplier circuit by described second filter circuit, and described second filter circuit is for being filtered and noise reduction process the voltage signal after described frequency multiplier circuit processes.
The test device of electrical conductivity according to an embodiment of the invention, by arranging the second filter circuit between frequency multiplier circuit and peak detection circuit, it is filtered processing with the voltage signal after frequency multiplier circuit is processed, reduce noise and the fluctuation situation of test signal, and then can ensure that the accuracy of test result.
According to one embodiment of present invention, described signal processing circuit, also include: the 3rd filter circuit, described analog-digital converter is connected to described peak detection circuit by described 3rd filter circuit, and described 3rd filter circuit is filtered and noise reduction process for the voltage peak signal that described peak detection circuit is exported.
The test device of electrical conductivity according to an embodiment of the invention, by arranging the 3rd filter circuit between peak detection circuit and analog-digital converter, it is filtered processing with the voltage signal that peak detection circuit is exported, create a further reduction the noise of test signal and fluctuation situation and then it is also ensured that the accuracy of test result.
According to one embodiment of present invention, described microprocessor includes described square wave occurring source.
The test device of electrical conductivity according to an embodiment of the invention, by square wave occurring source is arranged in described microprocessor, by microprocessor, square wave occurring source can be carried out parameter setting and amendment, if microprocessor is single-chip microcomputer, it is possible to exported square-wave signal by single-chip microcomputer. It addition, adopt square wave occurring source to reduce the holistic cost testing device of electrical conductivity, specifically, square-wave signal is easiest to one of signal obtaining sinusoidal signal, therefore, it is not necessary to adopt high ground equipment to obtain the sine wave signal without flip-flop.
According to one embodiment of present invention, described microprocessor is additionally operable to: the mode that described square wave occurring source produces described square-wave signal is controlled. Wherein, microprocessor can control square wave occurring source and continue to produce square-wave signal, to realize treating the continuance test of tested media, as the electrical conductivity in water purifier water route is carried out continuance test; Certainly, microprocessor can also control square wave occurring source and at a time produce square-wave signal, to realize treating the interruption test of tested media, namely just tests when needs are tested, such as the test etc. to soil moisture, meat products.
According to one embodiment of present invention, described on-off circuit includes: at least three switchs, and each described switch and test electrode described in a group are connected, and each described switch is for controlling the duty testing electrode described in a group.
The test device of electrical conductivity according to an embodiment of the invention, the duty of one group of test electrode is controlled respectively by arranging at least three switch, within the same time, arbitrary group of test electrode can be selected to test, the convenient control realizing at least three groups are tested electrode.
According to one embodiment of present invention, described microprocessor is additionally coupled to described on-off circuit, is used for controlling each described switch Guan Bi or disconnecting, is controlled with the duty to described often group test electrode.
The test device of electrical conductivity, controls the closure state of each switch by microprocessor according to an embodiment of the invention, it is achieved that the effect of the convenient duty controlling test electrode.
According to one embodiment of present invention, described microprocessor includes: decision circuitry, for judging whether the electrical conductivity of the medium described to be tested determined is in default conductivity range; Cue circuit, is connected to described decision circuitry, during for judging that in described decision circuitry the electrical conductivity of described medium to be tested is not in described default conductivity range, sends cue.
The test device of electrical conductivity according to an embodiment of the invention, by arranging decision circuitry and cue circuit in the microprocessor, can be implemented in after determining electrical conductivity, comparison according to electrical conductivity and default conductivity range, determine the state of matter corresponding to electrical conductivity, and by result of determination is prompted to user, makes user obtain state of matter more intuitively, improve Consumer's Experience.
According to one embodiment of present invention, described first filter circuit includes: the filter circuit combined by band filter and pi type filter.
The test device of electrical conductivity according to an embodiment of the invention, the filter circuit combined by band filter and pi type filter is as the first filter circuit, effectively obtain the sinusoidal signal without flip-flop, and then avoid the electrode polarization effect that direct current signal causes; And it is able to ensure that obtaining sinusoidal signal has stable amplitude and frequency, and then may insure that the accuracy of electrical conductivity test result.
According to one embodiment of present invention, described sinusoidal signal is the sinusoidal signal with single waveform, or the sinusoidal signal being made up of the sinusoidal signal superposition of multiple waveforms. Specifically, being applied to the pumping signal on electrode can be single sinusoidal signal, it is also possible to be that many sinusoidal signals encourage simultaneously, to realize the acquisition of the electrical impedance information at multi-frequency place.
Embodiment according to another aspect of the present invention, it is also proposed that a kind of for electrical equipment, including: the test device of the electrical conductivity as described in above-mentioned any one technical scheme. Electrical equipment can be water purifier etc.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1 illustrates the structural representation of the test device of electrical conductivity according to an embodiment of the invention;
Fig. 2 illustrates the structural representation of the first filter circuit in the test device of electrical conductivity according to an embodiment of the invention;
Fig. 3 illustrates the structural representation of the current sampling circuit in the test device of electrical conductivity according to an embodiment of the invention;
Fig. 4 illustrates the structural representation of the frequency multiplier circuit of the test device of electrical conductivity according to an embodiment of the invention;
Fig. 5 illustrates the structural representation of the peak detection circuit of the test device of electrical conductivity according to an embodiment of the invention.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail. It should be noted that when not conflicting, embodiments herein and the feature in embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention; but; the present invention can also adopt other to be different from other modes described here to implement, and therefore, protection scope of the present invention is by the restriction of following public specific embodiment.
Fig. 1 illustrates the structural representation of the test device of electrical conductivity according to an embodiment of the invention.
As it is shown in figure 1, the test device of electrical conductivity according to an embodiment of the invention, including: square wave occurring source 102, it is used for producing square-wave signal; First filter circuit 104, is connected to described square wave occurring source 102, and the described square-wave signal for described square wave occurring source 102 is produced is filtered processing, and is not comprised the sinusoidal signal of flip-flop, using by described sinusoidal signal as test voltage; Test electrode unit 106, including at least three group test electrodes being connected in parallel, described test electrode unit 106 is connected to described first filter circuit 104, for described test voltage is applied to medium 116 to be tested; Current detection circuit, for detecting the current signal flowing through described test electrode unit 106, and is converted into corresponding voltage signal by the current signal detected; On-off circuit 114, is connected between described test electrode unit 106 and described current detection circuit 108, is used for the duty of often group test electrode at least three groups test electrodes described in controlling; Frequency multiplier circuit 110, is connected to described current detection circuit 108, for described voltage signal is carried out process of frequency multiplication; Signal processing circuit 112, is connected to described frequency multiplier circuit 110, for determining the electrical conductivity of described medium to be tested 116 according to the voltage signal after described frequency multiplier circuit 110 processes.
By the first filter circuit 104 is connected to square wave occurring source 102, it is filtered processing with the square-wave signal that square wave occurring source 102 is produced, finally obtain the sinusoidal signal without flip-flop, employing continuous current excitation signal in correlation technique can be avoided, or directly adopt the undressed ac-excited signal including flip-flop to cause polarization of electrode effect; Simultaneously as be by the sinusoidal signal that obtains after being filtered square-wave signal processing, therefore can ensure that be applied on test electrode ac-excited has stable amplitude and frequency, and then may insure that the accuracy of electrical conductivity test result.
Additionally, by arranging on-off circuit 114 to control the duty of often group test electrode, enhance the test multiformity of the test device of electrical conductivity, namely the simple switching of on-off circuit 114 can be passed through, realize being treated tested media by different test electrodes to test, meet the needs of different test scene, as conductivity imaging field, it is achieved that the electrical conductivity of the difference treating tested media by least three group electrodes is tested. Preferably, at least three group test electrodes can only have one group of test electrode work at synchronization, produce interference between the signal of electrode tests to avoid at least three groups to test.
And due to when the impedance of the frequency of pumping signal, medium to be tested meets certain condition, the amplitude of voltage signal of current detection circuit 108 output and the electrical conductivity of the medium 116 to be tested monotonic increase relation in approximate direct ratio, therefore the voltage signal by arranging frequency multiplier circuit, current detection circuit 108 exported carries out process of frequency multiplication, the electrical conductivity that can make measurement result and medium 116 to be tested presents nearly quadratic relationship, and then is capable of the medium of high conductivity is measured accurately.
In addition, the present invention propose electrical conductivity test device less costly, facilitate implementation batch production and the application of the test device of electrical conductivity, as being applied in water quality (drinking water etc.), heavy metal pollution, skin (human body skin moisture, fat, dermatosis), electrolyte (acid or alkali), biological tissue's (disease, such as breast carcinoma, carcinoma of prostate etc.), meat products (cattle meat, Carnis Sus domestica, Carnis Equi Asini, Carnis Canitis, Carnis Gallus domesticus, the rotten detection of the meat productss such as duck meat), grain (rice, the corn such as Semen Tritici aestivi) moisture, soil moisture, liquid medium liquid level, temperature survey, alcoholic strength, Water-In-Oil, oil-in-water, in the measurement of the electrical conductivity such as electromagnetic nondestructive.
Wherein, square wave occurring source 102 can produce fixed frequency, low level is the square-wave signal of zero, and certainly, the low level of the square-wave signal that square wave occurring source 102 produces can also more than 0 or less than 0. All harmonic componentss except the harmonic wave of basis in square-wave signal can be filtered by the first filter circuit 104, using by basis harmonic wave as pumping signal, it is of course also possible to using other harmonic componentss as pumping signal.
It addition, the test device of electrical conductivity according to the abovementioned embodiments of the present invention, it is also possible to there is following additional technical characteristic:
According to one embodiment of present invention, described signal processing circuit 112, including: peak detection circuit 1122, it is connected to described frequency multiplier circuit 110, for detecting the peak value of the voltage signal after described frequency multiplier circuit 110 processes; Analog-digital converter 1124, is connected to described peak detection circuit 1122, carries out analog-to-digital conversion process for the peak value that described peak detection circuit 1122 is detected, to obtain digital signal; Microprocessor 1126, is connected to described analog-digital converter 1124, for determining the electrical conductivity of described medium to be tested 116 according to described digital signal.
By setting gradually peak detection circuit 1122, analog-digital converter 1124 and microprocessor 1126 in signal processing circuit 112, it is possible to make to test the conductivity value obtained and be compatible with digital circuit. Specifically, by analogue signal is quantified as digital signal, it is possible to use the electrical conductivity of test is checked at family more intuitively, improves Consumer's Experience.
According to one embodiment of present invention, described signal processing circuit 112, also include: the second filter circuit (not shown), described peak detection circuit 1122 is connected to described frequency multiplier circuit 110 by described second filter circuit, and described second filter circuit is for being filtered and noise reduction process the voltage signal after described frequency multiplier circuit 110 processes.
By arranging the second filter circuit between frequency multiplier circuit 110 and peak detection circuit 1122, it is filtered processing with the voltage signal after frequency multiplier circuit 110 is processed, reduce noise and the fluctuation situation of test signal, and then can ensure that the accuracy of test result.
According to one embodiment of present invention, described signal processing circuit 112, also include: the 3rd filter circuit (not shown), described analog-digital converter 1124 is connected to described peak detection circuit 1122 by described 3rd filter circuit, and described 3rd filter circuit is for being filtered and noise reduction process the voltage peak signal of described peak detection circuit 1122 output.
By arranging the 3rd filter circuit between peak detection circuit 1122 and analog-digital converter 1124, it is filtered processing with the voltage signal that peak detection circuit 1122 is exported, create a further reduction the noise of test signal and fluctuation situation and then it is also ensured that the accuracy of test result.
According to one embodiment of present invention, described microprocessor 1126 includes described square wave occurring source 102.
By square wave occurring source 102 being arranged in described microprocessor 1126, it is possible to by microprocessor 1126, square wave occurring source 102 is carried out parameter setting and amendment, if microprocessor 1126 is single-chip microcomputer, it is possible to exported square-wave signal by single-chip microcomputer. It addition, adopt square wave occurring source 102 to reduce the holistic cost testing device of electrical conductivity, specifically, square-wave signal is easiest to one of signal obtaining sinusoidal signal, and high ground equipment therefore need not be adopted to obtain the sine wave signal without flip-flop.
According to one embodiment of present invention, described microprocessor 1126 is additionally operable to: the mode that described square wave occurring source 102 is produced described square-wave signal is controlled. Wherein, microprocessor 1126 can control square wave occurring source 102 and continue to produce square-wave signal, to realize treating the continuance test of tested media, as the electrical conductivity in water purifier water route is carried out continuance test; Certainly, microprocessor 1126 can also control square wave occurring source 102 and at a time produce square-wave signal, to realize treating the interruption test of tested media, namely just tests when needs are tested, such as the test etc. to soil moisture, meat products.
According to one embodiment of present invention, described on-off circuit 114 includes: at least three switchs, and each described switch and test electrode described in a group are connected, and each described switch is for controlling the duty testing electrode described in a group.
Control the duty of one group of test electrode respectively by arranging at least three switch, it is possible within the same time, select arbitrary group of test electrode to test, the convenient control realizing at least three groups are tested electrode.
According to one embodiment of present invention, described microprocessor 1126 is additionally coupled to described on-off circuit 114, is used for controlling each described switch Guan Bi or disconnecting, is controlled with the duty to described often group test electrode.
The closure state of each switch is controlled, it is achieved that the effect of the convenient duty controlling test electrode by microprocessor 1126. Wherein, on-off circuit 114 can be analog switching circuit.
According to one embodiment of present invention, described microprocessor 1126 includes: decision circuitry (not shown), for judging whether the electrical conductivity of the medium 116 described to be tested determined is in default conductivity range; Cue circuit (not shown), is connected to described decision circuitry, during for judging that in described decision circuitry the electrical conductivity of described medium 116 to be tested is not in described default conductivity range, sends cue.
By arranging decision circuitry and cue circuit in microprocessor 1126, can be implemented in after determining electrical conductivity, comparison according to electrical conductivity and default conductivity range, determine the state of matter corresponding to electrical conductivity, and by result of determination is prompted to user, make user obtain state of matter more intuitively, improve Consumer's Experience.
According to one embodiment of present invention, described first filter circuit 104 includes: the filter circuit combined by band filter and pi type filter.
The filter circuit combined by band filter and pi type filter, as the first filter circuit 104, has been effectively obtained the sinusoidal signal without flip-flop, and then has avoided the electrode polarization effect that direct current signal causes; And it is able to ensure that obtaining sinusoidal signal has stable amplitude and frequency, and then may insure that the accuracy of electrical conductivity test result.
According to one embodiment of present invention, described sinusoidal signal is the sinusoidal signal with single waveform, or the sinusoidal signal being made up of the sinusoidal signal superposition of multiple waveforms. Specifically, the pumping signal being applied on test electrode can be single sinusoidal signal, it is also possible to be that many sinusoidal signals encourage simultaneously, to realize the acquisition of the electrical impedance information at multi-frequency place.
Wherein, the circuit structure of the first filter circuit 104 can as in figure 2 it is shown, the input 1042 of the first filter circuit 104 be connected to the outfan of square wave occurring source 102, and the first filter circuit outfan 1044 is connected to test electrode unit 106.
The circuit structure of current detection circuit 108 can as it is shown on figure 3, the electric current flowing through test electrode unit 106 be sampled by the input 1082 of current detection circuit 108, and the outfan 1084 of current detection circuit 108 is connected to the input of frequency multiplier circuit 110.
The circuit structure of frequency multiplier circuit 110 can as shown in Figure 4, and the input 1102 of frequency multiplier circuit 110 is connected to the outfan 1084 of current detection circuit 108, and the outfan 1104 of frequency multiplier circuit is connected to the input of peak detection circuit 1122.
The circuit structure of peak detection circuit 1122 can as it is shown in figure 5, the input 112A of peak detection circuit 1122 be connected to the outfan 1104 of frequency multiplier circuit, and the outfan 112B of peak detection circuit 1122 is connected to the input of analog-digital converter 1124.
Technical scheme is described in detail above in association with accompanying drawing, the present invention proposes the test device of a kind of new electrical conductivity, can under avoiding the test polarized premise of electrode, the electrical conductivity treating tested media exactly is tested, and disclosure satisfy that the needs of different test scene.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the test device of an electrical conductivity, it is characterised in that including:
Square wave occurring source, is used for producing square-wave signal;
First filter circuit, is connected to described square wave occurring source, and the described square-wave signal for described square wave occurring source is produced is filtered processing, and is not comprised the sinusoidal signal of flip-flop, using by described sinusoidal signal as test voltage;
Test electrode unit, including at least three group test electrodes being connected in parallel, described test electrode unit is connected to described first filter circuit, for described test voltage is applied to medium to be tested;
Current detection circuit, for detecting the current signal flowing through described test electrode unit, and is converted into corresponding voltage signal by the current signal detected;
On-off circuit, is connected between described test electrode unit and described current detection circuit, is used for the duty of often group test electrode at least three groups test electrodes described in controlling;
Frequency multiplier circuit, is connected to described current detection circuit, for described voltage signal is carried out process of frequency multiplication;
Signal processing circuit, is connected to described frequency multiplier circuit, for determining the electrical conductivity of described medium to be tested according to the voltage signal after described frequency multiplier circuit processes.
2. the test device of electrical conductivity according to claim 1, it is characterised in that described signal processing circuit, including:
Peak detection circuit, is connected to described frequency multiplier circuit, for detecting the peak value of the voltage signal after described frequency multiplier circuit processes;
Analog-digital converter, is connected to described peak detection circuit, carries out analog-to-digital conversion process for the peak value that described peak detection circuit is detected, to obtain digital signal;
Microprocessor, is connected to described analog-digital converter, for determining the electrical conductivity of described medium to be tested according to described digital signal.
3. the test device of electrical conductivity according to claim 2, it is characterised in that described signal processing circuit, also includes:
Second filter circuit, described peak detection circuit is connected to described frequency multiplier circuit by described second filter circuit, and described second filter circuit is for being filtered and noise reduction process the voltage signal after described frequency multiplier circuit processes.
4. the test device of electrical conductivity according to claim 2, it is characterised in that described signal processing circuit, also includes:
3rd filter circuit, described analog-digital converter is connected to described peak detection circuit by described 3rd filter circuit, and described 3rd filter circuit is filtered and noise reduction process for the voltage peak signal that described peak detection circuit is exported.
5. the test device of electrical conductivity according to claim 2, it is characterised in that described microprocessor includes described square wave occurring source, and described microprocessor is additionally operable to: the mode that described square wave occurring source produces described square-wave signal is controlled.
6. the test device of electrical conductivity according to claim 2, it is characterised in that described on-off circuit includes:
At least three switchs, and each described switch and test electrode described in a group are connected, and each described switch is for controlling the duty testing electrode described in a group.
7. the test device of electrical conductivity according to claim 6, it is characterised in that described microprocessor is additionally coupled to described on-off circuit, is used for controlling each described switch Guan Bi or disconnecting, is controlled with the duty to described often group test electrode.
8. the test device of electrical conductivity according to claim 1, it is characterised in that described first filter circuit includes: the filter circuit combined by band filter and pi type filter.
9. the test device of electrical conductivity according to any one of claim 1 to 8, it is characterised in that described sinusoidal signal is the sinusoidal signal with single waveform, or the sinusoidal signal being made up of the sinusoidal signal superposition of multiple waveforms.
10. an electrical equipment, it is characterised in that including: the test device of electrical conductivity as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410649315.9A CN105652095A (en) | 2014-11-14 | 2014-11-14 | Conductivity test device and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410649315.9A CN105652095A (en) | 2014-11-14 | 2014-11-14 | Conductivity test device and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105652095A true CN105652095A (en) | 2016-06-08 |
Family
ID=56480047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410649315.9A Pending CN105652095A (en) | 2014-11-14 | 2014-11-14 | Conductivity test device and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105652095A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111527401A (en) * | 2017-12-15 | 2020-08-11 | 罗伯特·博世有限公司 | Sensor device for detecting an electrically conductive medium and method for operating a sensor device |
| CN112179950A (en) * | 2020-09-30 | 2021-01-05 | 北京航空航天大学 | Three-dimensional bimodal electrical impedance imaging sensor and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488509A (en) * | 2002-07-24 | 2004-04-14 | ���ṫ˾ | Liquid detecting device, liquid-amount detecting device and detecting method tehreof |
| CN101871909A (en) * | 2010-05-31 | 2010-10-27 | 陈林延 | Bielectrode liquid parameter on-line measuring device |
| CN202948068U (en) * | 2012-09-19 | 2013-05-22 | 福建师范大学 | Measuring device for measuring conductivity of solution excited by two kinds of sine wave signals arranged in a superposing way and having different frequencies |
| CN103792266A (en) * | 2012-11-16 | 2014-05-14 | 开封开德流量仪表有限公司 | Measurement method for conductivity in electromagnetic flowmeter |
-
2014
- 2014-11-14 CN CN201410649315.9A patent/CN105652095A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488509A (en) * | 2002-07-24 | 2004-04-14 | ���ṫ˾ | Liquid detecting device, liquid-amount detecting device and detecting method tehreof |
| CN101871909A (en) * | 2010-05-31 | 2010-10-27 | 陈林延 | Bielectrode liquid parameter on-line measuring device |
| CN202948068U (en) * | 2012-09-19 | 2013-05-22 | 福建师范大学 | Measuring device for measuring conductivity of solution excited by two kinds of sine wave signals arranged in a superposing way and having different frequencies |
| CN103792266A (en) * | 2012-11-16 | 2014-05-14 | 开封开德流量仪表有限公司 | Measurement method for conductivity in electromagnetic flowmeter |
Non-Patent Citations (6)
| Title |
|---|
| 吴元亮: "基于双频测定法的水电导率仪研制", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
| 崔鹏飞等: "多频率方波激励阻容解耦软测量的数值模拟", 《仪器仪表学报》 * |
| 李琳等: "频率自适应电流源克服电容影响的电导率测量", 《仪器仪表学报》 * |
| 申忠如: "《模拟电子技术基础》", 31 January 2012, 西安交通大学出版社 * |
| 邢文凯等: "一种克服分布电容的双频驱动电导率测量方法", 《仪器仪表用户》 * |
| 郭兵: "《高频电子技术》", 31 October 2011, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111527401A (en) * | 2017-12-15 | 2020-08-11 | 罗伯特·博世有限公司 | Sensor device for detecting an electrically conductive medium and method for operating a sensor device |
| US11761808B2 (en) | 2017-12-15 | 2023-09-19 | Robert Bosch Gmbh | Sensor device for detecting electrically conductive media, and method for operating the sensor device |
| CN112179950A (en) * | 2020-09-30 | 2021-01-05 | 北京航空航天大学 | Three-dimensional bimodal electrical impedance imaging sensor and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2803667A1 (en) | Electrical tomography apparatus and method and current driver | |
| CN101629925B (en) | Method and device for measuring the conductivity of a pure or ultrarapture liquid | |
| CN101999899A (en) | Multi-frequency measuring device and method for human body segmental impedance | |
| Romano et al. | Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems | |
| CN105652096B (en) | Conductivity testing device and electric equipment | |
| CN105652095A (en) | Conductivity test device and electrical equipment | |
| CN204241570U (en) | The proving installation of conductivity and consumer | |
| CN105588983B (en) | Conductivity testing device and electric equipment | |
| CN103149541B (en) | Method for extracting weak signals in magnetic field measurement | |
| CN204203360U (en) | The proving installation of conductivity and consumer | |
| CN205246587U (en) | A portable instrument for detecting edible new freshness of meat | |
| CN106770141A (en) | Edible oil quality detection method, equipment and system | |
| CN105652092A (en) | Testing apparatus of conductivity and electrical equipment | |
| CN105651829A (en) | Conductivity test device and electrical apparatus | |
| CN204203359U (en) | The proving installation of conductivity and consumer | |
| CN210243747U (en) | Different-frequency full-automatic dielectric loss tester | |
| CN203244392U (en) | Vocal cord detecting device based on electric impedance analysis | |
| CN105934886B (en) | Semiconductor switch and for determining the method by the electric current of semiconductor switch | |
| CN209074612U (en) | The detection system of bio-electrical impedance spectrum | |
| Montero‐Rodríguez et al. | Development of an impedance spectroscopy device for on‐line cell growth monitoring | |
| JP6636368B2 (en) | Impedance measuring device | |
| Zhong et al. | Enhanced Bio-impedance Demodulation Method under Non-integer Period Sampling Conditions | |
| CN107632247B (en) | Method, device and equipment for detecting state of magnetron | |
| CN205427011U (en) | Multi -functional frequency measurement instrument of digital display | |
| CN108685572A (en) | Multichannel electrical impedance tomography circuit and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160608 |
|
| RJ01 | Rejection of invention patent application after publication |