基于压电传感器的电子听诊器设计及实现  

Design and Implementation of Electronic Stethoscope Based on Piezoelectric Sensor

作　　者：刘佳琦 崔建功[1] 张国军[1] 史鹏程 朱垚娟 张文栋[1] LIU Jiaqi;CUI Jiangong;ZHANG Guojun;SHI Pengcheng;ZHU Yaojuan;ZHANG Wendong(State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学省部共建动态测试技术国家重点实验室,山西太原030051

出　　处：《测试技术学报》2024年第6期635-641,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金面上资助项目(62274149,52175553);山西省基础研究计划资助项目(202103021224203,20210302123027);山西省“1331工程”重点学科建设计划资助项目。

摘　　要：压电式心音传感器作为声敏感单元,传感头一般采用硅胶类亲肤材料进行封装,但由于硅胶与皮肤的声阻抗失配较大,所以心音传感器普遍存在信噪比低、易受外界干扰等缺陷。针对压电式传感器封装存在的问题,提出了一种液体式封装方法。该方法针对压电传感器的结构和封装要求设计了电子听诊器的封装壳体和封装工艺;仿真了不同液体环境下的声场衰减,并制备了以封装去离子水和硅油作为过渡层的电子听诊器探头;用封装后的传感器测试心音信号,并与3M听诊器进行对比。测试结果表明,采用去离子水封装的传感器测到的心音信号幅值更大,且其信噪比远大于3M听诊器。The sensing head of the piezoelectric heart sound sensor is typically packaged with skin-friendly materials like silica gel because it is a sound-sensitive device.However,due to the significant acoustic impedance mismatch between silica gel and skin,the heart sound sensor typically exhibits defects such as a low signal-to-noise ratio and susceptibility to external interference.Aiming to address the issues pre⁃sented in piezoelectric sensor packaging,a liquid packaging method is proposed.The packing shell and packing technique of the electronic stethoscope are designed following the piezoelectric sensor′s construc⁃tion and packaging requirements.The attenuation of the sound field in various liquid environments is simu⁃lated,and deionized water and silicone oil were used to construct an electronic stethoscope probe with a transition layer.The cardiac sound signal are tested by the packed sensors and compared to a 3M stetho⁃scope.The test results show that the amplitude of the heart sound signal measured by the sensor with the deionized water package is larger,and its signal-to-noise ratio is much larger than that of the 3M stethoscope.

关 键 词：压电传感器 心音传感器 过渡层封装 

分 类 号：TH776[机械工程—仪器科学与技术]