Linear real-time estimation method of conductivity resistance-capacitance network parameter
A resistance-capacitance network and conductivity technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, fluid resistance measurement, etc., can solve problems such as difficult elimination, neglect of electric double layer capacitance, uncertain number of iterations, etc.
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[0034] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0035] Before the actual measurement, the multivariate polynomial fitting of the mathematical model (1) is carried out offline. The solution resistance R x , capacitance C p The measurement range should be segmented, and the segment range should not be too large. The selection range of the excitation frequency f is 0~1 / 2τ(τ=(R 1 / / R x )·C p is the time constant). In the selected (R x , C p , f) In the subsection range, 1000 groups of R are scattered and selected x = x, C p =y, the value of f is substituted into formula (2) to get 1000 groups of response DC voltage values v. Substitute these 1000 sets of values (x, y, f; v) into the equation system of formula (3), and solve the coefficient a of the polynomial fitting model 0 , a 1 ,...,a 9 . Repeat the above steps until all segments have obtained cor...
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