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Resistor-capacitor decoupling soft sensing method based on magnitude-phase characteristics

A soft measurement, amplitude and phase technology, applied in the direction of fluid resistance measurement, etc., can solve problems such as difficult, high time synchronization requirements, ignoring electric double layer capacitance, etc., to achieve the effect of fewer iterations and high measurement accuracy

Inactive Publication Date: 2010-09-22
DALIAN UNIV OF TECH
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Problems solved by technology

The phase-sensitive detection method uses sinusoidal excitation to eliminate the polarization effect, and can effectively eliminate the influence of the distributed capacitance of the lead, but ignores the existence of the electric double layer capacitance
The double-pulse method uses two opposite-polarity pulse excitations, which takes into account the influence of the electric double layer capacitance and the distributed capacitance of the leads. It has great advantages in principle, but it requires extremely high time synchronization in implementation.
The dynamic pulse method uses the flow pulse as the excitation, which can effectively eliminate the capacitive effect, and at the same time reduce the influence of the polarization effect by reducing the pulse amplitude, but it is difficult to completely eliminate it

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Embodiment Construction

[0028] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0029] As shown in the figure, set the excitation source to send out a sine wave signal with an amplitude of 1V, a phase of 0rad, and a frequency that can be controlled by a single-chip microcomputer. After the signal passes through the conductivity cell system, use high-speed A / D to sample the response signal within one cycle to obtain 10 sets of sampling point values, and the time value is t 1 , t 2 ,...,t n , the voltage value is v 1 , v 2 ,...,v n . Select time value t 1 , t 5 and voltage value v 1 , v 5 Substitute into formula (2) to get the iteration initial value A o and

[0030] Get the iteration initial value A o and After that, first check whether its value is in the order of magnitude. If A o Compare is large, then increase the frequency of the excitation source, if A o Compare If i...

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Abstract

The invention relates to a resistor-capacitor decoupling soft sensing method based on magnitude-phase characteristics, belonging to the technical field of the soft sensing technology of solution conductivity. The method is characterized in that the conductivity measurement in a conductivity cell is changed to the measurement of electrical property equivalent resistance-capacitance network of the conductivity cell, and the magnitude-phase characteristics of the resistance-capacitance network is estimated to obtain the resistance-capacitance parameter, wherein the resistance parameter is the resistance of the solution to be measured. Sine wave is used to excite the resistance-capacitance network; the steepest descent method is adopted for optimization and calculation based on the non-linear principle of least square; and multi-sampling of response signals is utilized to fit system function form and further obtain magnitude-phase characteristic parameter of the system. Then the magnitude-phase characteristics and the function relationship of the resistance-capacitance network are used to obtain the resistance-capacitance parameter. The invention has the effects and benefits of higher measurement accuracy and less iterations. In addition, the invention also provides a method for accurately obtaining the magnitude-phase characteristics of the linear system.

Description

technical field [0001] The invention belongs to the technical field of solution conductivity soft measurement, and relates to a decoupling soft measurement method for equivalent resistance-capacitance network parameters of electrical characteristics of a conductance cell, in particular to a method for obtaining resistance-capacitance network parameters through amplitude and phase characteristic detection. Background technique [0002] As an important electrochemical analysis parameter, conductivity is widely used in production and scientific research departments such as chemical industry, metallurgy, biology, medicine, food and water conservancy. As the conductivity measurement is more and more widely used, the requirements for its measurement accuracy and measurement speed are also getting higher and higher. The methods mentioned in the literature [1] include phase-sensitive detection method, double pulse method and dynamic pulse method. These methods are based on the equiv...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/22
Inventor 周楷棣张立勇凌经纬仲崇权李丹
Owner DALIAN UNIV OF TECH
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