纳米复合材料压阻式薄膜超声传感器近场干扰抑制方法  

Method for suppressing near-field interference in thin-film nanocomposite piezoresistive ultrasonic sensor

作　　者：潘星辰 原可义 东蕊[1,3] 王凯 饶静 Pan Xingchen;Yuan Keyi;Dong Rui;Wang Kai;Rao Jing(Key Laboratory of Nondestructive Testing and Evaluation,State Administration for Market Regulation,Beijing 100029,China;School of Instrumentation and Opto-Electronic Engineering,Beihang University,Beijing 100191,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China;School of Aerospace Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]国家市场监督管理总局无损检测与评价重点实验室,北京100029 [2]北京航空航天大学仪器科学与光电工程学院,北京100191 [3]中国特种设备检测研究院,北京100029 [4]厦门大学航空航天学院,厦门361005

出　　处：《仪器仪表学报》2024年第12期36-44,共9页Chinese Journal of Scientific Instrument

基　　金：国家市场监督管理总局无损检测与评价重点实验室开放基金项目(SYS-NDT&E-2024-001);国家自然科学基金面上项目(62271021)资助。

摘　　要：与常规超声传感器相比,基于纳米石墨烯/聚乙烯吡咯烷酮(GNP/PVP)的柔性压阻式薄膜超声传感器具有轻质、柔性、宽频带、易集成,且能够与曲面表面共形贴合的优点,在无损检测与结构健康监测领域展现出了良好的应用前景。然而,当压阻式薄膜超声传感器与超声发射装置距离较近、传感器与转换电路的连接方式不稳定或测试系统电磁屏蔽设计失效时,会引入较大的电磁干扰,导致强烈的信号串扰,影响近场范围内的声场信息获取及超声信号质量。为了有效抑制串扰信号,分别采用移相与差分放大补偿方法以及基于互相关的迭代逼近方法实现超声信号的重构。实验结果表明,移相与差分放大补偿方法处理后的信号可以有效去除利用GNP/PVP压阻式薄膜超声传感器接收到超声信号的串扰;基于互相关的迭代逼近方法能够使得串扰信号的区间方差减少99.18%,从而更有效地抑制了串扰对超声信号的干扰。Compared to conventional ultrasonic sensors,the flexible piezoresistive film ultrasonic sensor based on nanographene/polyvinylpyrrolidone(GNP/PVP)offers advantages such as light weight,flexibility,wide bandwidth,easy integration,and the ability to conform to curved surfaces,showing great potential in non-destructive testing and structural health monitoring.However,when the piezoresistive film ultrasonic sensor is close to the ultrasonic emission device,instability in the connection between the sensor and the conversion circuit,or inadequate electromagnetic shielding in the testing system,can introduce significant electromagnetic interference.This interference results in strong signal crosstalk,affecting the acquisition of acoustic field information and the quality of ultrasonic signals within the near-field range.To effectively suppress crosstalk signals,this paper employs phase shift and differential amplification compensation methods,as well as an iterative approximation method based on cross-correlation to reconstruct the ultrasonic signals.Experimental results show that signals processed with phase shift and differential amplification compensation methods can effectively remove the crosstalk received by the GNP/PVP piezoresistive film ultrasonic sensor.Additionally,the iterative approximation method based on cross-correlation reduces the variance of the crosstalk signal interval by 99.18%,thereby more effectively suppressing the impact of crosstalk on the ultrasonic signal.Compared to conventional ultrasonic sensors,the flexible piezoresistive film ultrasonic sensor based on nanographene/polyvinylpyrrolidone(GNP/PVP)offers advantages such as light weight,flexibility,wide bandwidth,easy integration,and the ability to conform to curved surfaces,showing great potential in non-destructive testing and structural health monitoring.However,when the piezoresistive film ultrasonic sensor is close to the ultrasonic emission device,the connection between the sensor and the conversion circuit is unstable,or the electroma

关 键 词：纳米GNP/PVP压阻式薄膜超声传感器 近场干扰 串扰抑制 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置] TH878[自动化与计算机技术—控制科学与工程]