固体超声声速的脉冲反射法测量

基金项目:

中国工程物理研究院双百人才基金资助项目(2008R0106)

冲击波物理与爆轰物理重点实验室基金资助项目(9140C6703010905)

详细信息

The Measurement of Ultrasonic Sound Velocity in Solid Materials by Pulsed Echo Method

摘要: 为了提高声速测量时的延时测量精度, 对常用的脉冲反射法声速测量的信号进行了频谱分析。发现声束扩散引起的回波信号畸变, 对判断超声传播时间有一定影响。改用函数发生器的正弦信号, 采用双探头脉冲反射法, 提高了时间测量精度, 降低了对仪器的不良影响。
- 超声波检测 /
- 脉冲反射法 /
- 声速 /
- 声束扩散 /
- 双探头
Abstract: To improve the precision of time span measurement during measuring sonic velocity, we carried out spectrum analysis on signals of ultrasonic sound velocity got by commonly pulse echo method, and found that the signals were distorted due to beam spread. The distortions took some effect on the measure of time span between echoes. The use of sine wave from function generator as exciting source, and with double probes to excite and receive ultrasonic echoes, can improve accuracy of time span measurement, and reduce harmful effects to instruments.
- Ultrasonic testing /
- Pulsed echo method /
- Ultrasonic sound velocity /
- Beam spread /
- Double probes

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