Non-contact fluid electric impedance measurement device and method
A technology of electrical impedance measurement and impedance measurement, which is applied in fluid resistance measurement, material resistance, etc., can solve problems such as sensor or system measurement performance constraints, insufficient use of imaginary part signals, and incomplete fluid extraction features, etc., to improve device stability The effects of high performance and resolution, increasing the size range of pipe diameters, and compact distribution
Active Publication Date: 2016-02-03
ZHEJIANG UNIV
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Problems solved by technology
[0003] Unfortunately, due to the limitation of technological development level, the existing fluid electrical impedance measurement method still has some defects
On the one hand, its measurement principle is based on contact electrical impedance measurement. The measurement electrodes of the corresponding sensors are in direct contact with the measured fluid, which is prone to problems such as electrode polarization and electrochemical corrosion.
On the other hand, the existing electrical impedance measurement technology is aimed at obtaining the equivalent conductance of the fluid, that is, only the real part signal of the fluid electrical impedance signal is obtained, and the imaginary part signal is not fully utilized.
The absence of the imaginary part signal of electrical impedance will lead to incomplete extraction of fluid features
Corresponding sensor or system measurement performance is restricted
Method used
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[0026] Such as figure 1 As shown, a non-contact fluid electrical impedance measurement device includes an AC excitation source 1, an electrical impedance measurement sensor 10, an inductance module 6, a phase-sensitive demodulation module 7, a data acquisition module 8, and a computer 9; the AC excitation source 1 and One end of the inductance module 6 is connected, the other end of the inductance module 6 is connected with the excitation signal input end of the electrical impedance measurement sensor 10, and the detection signal output end of the electrical impedance measurement sensor 10 is connected with one end of the phase-sensitive demodulation module 7, and the phase-sensitive The demodulation module 7, the data acquisition module 8, and the computer 9 are connected in sequence.
[0027] Such as figure 2 As shown, as a preferred structure of the electrical impedance measuring sensor 10, the specific composition and connection method are as follows:
[0028] The elect...
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The invention discloses a non-contact fluid electrical impedance measurement device and a method. A sensor consists of a metal shielding housing, an excitation electrode, a detection electrode and an insulation pipeline; an AC excitation source provides a sine excitation signal through an excitation electrode and supplies an in-phase reference signal and a quadrature signal to a phase-sensitive demodulation module; and the metal shielding housing is installed on the outside of the excitation electrode and the detection electrode. The resistance generated by an electric inductance module is utilized to eliminate the affect of coupling capacitive resistance formed by the electrode and the conductive fluid flowing through insulation pipeline, and the total impedance of the a detection circuit is equal to the equivalent impedance of the fluid inside the pipeline. Real part information and imaginary part information of the fluid impedance is obtained by utilizing the phase sensitive modulation method. The invention provides a feasible method to the non-contact fluid electric impedance measurement, can simultaneously obtain the information of the real part and the imaginary part in the electric impedance signals, and is simple in sensor structure, easy in installation and non-invasive. Furthermore, the invention can also prevent the chemical corrosion and has no affect on the fluid inside the pipeline.
Description
technical field [0001] The invention relates to fluid electrical impedance measurement technology, in particular to a non-contact fluid electrical impedance measurement device and method. Background technique [0002] Fluids widely exist in industrial production and daily life, such as metallurgy, chemical engineering, biomedicine, environmental protection and sewage treatment, etc., which are of great significance to the measurement of various characteristic parameters of fluids. Electrical impedance is the general term for resistance, inductance, and capacitance in the circuit to the obstruction of alternating current. It is used to measure the obstruction of alternating current when it flows in the circuit. Through the measurement of electrical impedance, not only the conductivity of the fluid can be understood, Other characteristic parameters of the fluid can also be obtained, such as the concentration, composition, chemical reaction rate of the single-phase conductive f...
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IPC IPC(8): G01R27/22G01N27/07
Inventor 冀海峰常亚宋悦沈明琪毛欣王保良黄志尧李海青
Owner ZHEJIANG UNIV