点击次数：

论文类型：期刊论文

发表时间：2022-06-29

发表刊物：仪器仪表学报

期号：1

页面范围：154-160

ISSN号：0254-3087

摘要：Many parameter measurement problems, such as conductivity measurement, can be transformed into a resistance-capacitance (RC) network model. In this paper, multi-frequency AC square wave is adopted to excite RC network, and the measurement of RC decoupling can be converted to parameter estimation with nonlinear least squares on the basis of the nonlinear mathematical model of the response signal, excitation signal and RC parameters. Due to on-line application, steepest descent method is used to solve the parameters. Assisted by simulation analysis, the global optimality of the solution and the iterative convergence rate of the parameter calculation are discussed concretely. Aiming at the model of RC network in conductivity measurement, the experimental results show the effectiveness of the proposed method. When measuring conductivity, capacitance effect is considered as disturbance and can be eliminated by being constructed into the mathematical model for further estimation, which can improve the precision of the measurement and restrain the effects of measurement uncertainty effectively.

备注：新增回溯数据