用声透射损失测气一水混相介质中的含气量

Concentration of entrained air in air-water mixture as measured by sound transmission loss

本文利用超声检测中的穿透法，用频率为０．５ ＭＨｚ、 １ＭＨｚ、 １．２５ＭＨｚ、 ２ＭＨｚ、 ２．５ＭＨｚ的声波，测量了气一水混相介质中的声速比值和声透射损失。结果表明：在气泡大小、分布一定的情况下，可能用声透射损失来确定混相介质中的含气量，但不宜用声速比值．

The ratio of acoustic velocities and the sound transmission loss were measured in air-water mixture at frequencies of 0.5MHz, 1MHz, 1.25MHz, 2MHz, 2.5MHz. The experimental results indicate that the concentration of entrained air might be dete rmined by using the sound transmission loss, but it can not be determined by using the ratio of acoustic velocities.