pulse transducer

We find that the waveform and the pulse width of the ultrasonic pulse are determined by the thickness of the PVDF piezoelectric film transducer, the falling time of the step-function voltage, the transducer backing and the shape of the acoustic propagation medium.

实验结果表明，声脉冲的波形和脉冲宽度取决于PVDF压电膜的厚度，阶跃电压的下降沿宽度，以及背衬材料和声传播媒质的形状等多个因素。

Method The hardware design uses a P-ⅱ/ 233 multimedia microcomputer system, multi-channel A/ D converter, ECG electrodes, heart sound transducer, pulse transducer, and amplifiers and filters consisted with operation amplifiers.

【方法】本系统的硬件设计采用奔腾Ⅱ/233多媒体微机系统，多路模/数转换器和心电电极、心音传感器、脉搏波传感器及由运算放大器等构成相关的放大器及滤波器。

New method for detecting pulse-condition of vein accurately and its laser transducer design

精细静脉脉象检测新方法及其传感器设计