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最近国外利用如图的装置来测量液体中的超声波强度.进入受声面1的超声波在吸音物质3中进行传播.吸音物质是使用象聚乙烯类的吸收系数大、介质表面反射系数小的材料.4是热敏电阻或热电偶被封进在吸音物质3中.吸音物质的周围是由壁2围成的空气
Recently, foreign countries use the apparatus shown in the figure to measure the intensity of ultrasonic waves in the liquid. The ultrasonic waves entering the sound-receiving surface 1 are propagated in the sound-absorbing material 3. The sound-absorbing material is made of a material having a large absorption coefficient such as polyethylene and a small surface reflection coefficient .4 is a thermistor or thermocouple sealed in the sound absorbing material 3. The sound absorbing material is surrounded by the air surrounding the wall 2