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本文介绍一个基于取代法原理的低频超声脉冲测试系统,频率范围为0.25—4MHz.考虑了取代法中的衍射效应,定量地讨论了对衍射效应的校正问题.给出了对蓖麻油的测量结果.
In this paper, a low-frequency ultrasonic pulse test system based on the principle of substitution method is introduced, whose frequency range is 0.25-4MHz. The correction of diffraction effect is discussed quantitatively considering the diffraction effect in the substitution method. The measurement results of castor oil .