压差法测量超声波声强

基于声强在声学应用研究尤其是在声化学反应中的重要性,简单且快速测量声强的空间分布对声化学反应的放大具有重要意义.介绍了一种由三维定位仪和U型微压差计组成的声辐射压测量装置,将测得的声辐射压转换成声强.利用本方法对水中超声波声强进行了测定,并将测得结果与水听器法测得结果进行比较.结果表明,两者测量精度相当,测量结果达到了实验的要求.压差法测量声强方法简单、快速,测量结果准确.同时还对水中轴向声强衰减进行了测定,测量结果表明,轴向声强随着距离平方成倒数关系,符合声衰减理论规律.

Ultrasonic intensity measurement by differential pressure

Measurement of the sound intensity is very important in the study of sound application and sonochemistry. An easy and rapid method to measure the ultrasound field distribution is very important. A new method called differential pressure method is introduced to measure the ultrasound pressure by a three-dimensional locator and a micro-pressure gauge, and the sound pressure can be converted into sound intensity. The ultrasound intensity distribution in water was measured by the method that was compared with the results measured by hydrophone. It is showed that the precision of two methods are approximately the same, the measurement results can meet the needs for the study of ultrasound. The differential pressure method is an easy, quick and accurate method. The attenuation of the ultrasound in water is also studied. The results show that the ultrasound intensity in the axial direction is reversionally proportional to the square of length, which agrees with the sound attenuation law well.