A synchronous scanning measurement method for resistive sensor arrays based on Hilbert-Huang transform

TONG Zhixue, FENG Wenjun, CAO Hengyuan, CHANG Sheng, ZHANG Xuefeng

（School of Mechanical and Electrical Engineering， Xi’an University of Architecture and Technology， Xi’an 710055, China）

Abstract： 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.

Key words： Hilbert-Huang transform (HHT); resistive sensor array; AC measurement; endpoint effect; frequency spectrum analysis

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基于希尔伯特-黄变换的电阻传感器阵列

同志学，  冯文军，  曹恒源，  常胜，  张学锋

（西安建筑科技大学 机电工程学院， 陕西 西安 710055）

摘要：现有的频谱分析方法不能对电阻传感器阵列进行同步扫描， 本文将改进经验模态分解的希尔伯特-黄变换(HHT)对电阻阵列响应信号进行频谱分析。 首先， 分析经验模态分解过程中存在的端点效应。 针对经验模态分解过程中的端点效应问题， 通过对三种端点延拓方法进行比较， 得出适合处理电阻阵列响应信号的延拓方法。 然后， 利用改进算法对响应信号进行频谱分析， 可得到各单元的电阻与时间、频率和幅度的关系， 实现电阻阵列地测量。 最后， 通过仿真实验验证了改进HHT的有效性。 结果表明， 改进算法能够得到阵列中所有单元的准确时频分布， 可促进交流测量方法在传感器测量领域中的应用。

关键词：希特伯特-黄变换(HHT)；  电阻传感器阵列； 交流测量； 端点效应； 频谱分析

引用格式：TONG Zhixue, FENG Wenjun, CAO Hengyuan, et al． A synchronous scanning measurement method for resistive sensor arrays based on Hilbert-Huang transform． Journal of Measurement Science and Instrumentation， 2023， 14（4）： 379-386. DOI： 10．3969／j．issn．1674-8042．2023．04．001

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