pulse propagation time

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。

Summing up time harmonic propagated waves of all frequency gives the pulse propagation along the line.

加总所有频率成份弦波之时域传播即得时域脉波之传播.

The time delay and pulse width also depend on propagation distance.

脉冲时间延迟和脉冲宽度还随传输距离发生变化。

If the time harmonic source is assumed to be constant voltage, the summed pulse propagation is the impulse response along the line.

若各频率成份之电源为定电压，则所得时域脉波即脉冲电压源在传输线上之脉冲响应。

Current research mainly includes two methods: one method is according to the conversion relation between the pressure and volume pulse wave, another method is to use the pulse propagation time measure blood pressure.

目前的研究主要包括两种方法：一种是根据容积脉搏波和压力脉搏波之间的转换关系得到血压；另一种是利用脉搏波传导时间测量出血压。

The Frequency Spectrum Dsitribution and Time Propagation of Voltage and Current pulse on a Transmission Line.

传输线上脉波电压及电流之频谱分布及时域传播.