人体脉搏信号携带有丰富的与健康相关的生理信息.为了方便脉搏信号的采集和研究,本文设计出一种采用轻触式薄膜按键面板工艺的自制脉搏压力传感器,并使用了常见的555和V-f转换器件将传感器压力信号转换为电信号,再通过后续设计的滤波、陷波放大电路以及电路的干扰抑制处理,系统就可以获取高质量的脉搏波信号.传感器的性能测试以及示波器的应用结果表明,基于薄膜压力传感器的脉搏信号测试系统工作性能稳定,并通过示波器的串口通信扩展模块或者LABVIEW采集卡可以在计算机上显示出采集的脉搏信号,此测试系统可用于脉象信息的采集与研究.%The pulse wave signals contain plenty of information which conveys the health status of human body. To acquire and analyze the pulse signals, we developed a kind of pressure sensors, by adopting soft-touch metal dome craftsmanship. The oscillator amplifier 555 and V-f conversion circuit were utilized to transform the pressure signals into electric signals Then the system effectively acquired the pulse signals by following filter circuit, band stop circuit, amplifier circuit and the method of interference. Experiments of performance test to pressure sensor and oscilloscope proved that the test system based on thin film pressure sensor had reliable performance and could be used to study the pulse wave by the collected pulse signals shown on the computer through the serial communication expansion module of the oscilloscope or the data acquisition card of LABVIEW.
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