A synchronous scanning measurement method for resistive sensor arrays based on Hilbert-Huang transform
Zhixue Tong, Wenjun FENG, CAO Hengyuan, CHANG Sheng, Xuefeng Zhang · Journal of Measurement Science and Instrumentation · 2023
The current spectrum analysis method cannot perform synchronous scanning on the resistance sensor array. The Hilbert-Huang transform (HHT) with improved empirical mode decomposition is innovatively applied for the spectrum analysis of the response signal of the resistive array. First, the endpoint effects in the processing of empirical mode decomposition (EMD) are introduced. Aiming at the endpoint effect phenomenon in processing of EMD, the extension method which is appropriate to deal with the response signal of the resistive array is obtained by comparing three different kinds of extension methods. Then the improved algorithm is used for the spectrum analysis of the response signal of the resistive array. And the relations of all units' resistance and time, frequency and amplitude are obtained. In this way, all elements in the whole array can be accessed and measured. Finally, the effectiveness of the improved HHT is verified by simulation experiments. The results show that the improved algorithm can obtain the precise time-frequency distribution of all the elements in the array, which can promote the application of measurement method with AC power source in the field of resistive sensor array measurement.