Torr G R, Watmough D J
Phys Med Biol. 1977 May;22(3):444-50. doi: 10.1088/0031-9155/22/3/005.
The calorimeter absorbs, in a flow of castor oil, a fraction of the acoustic power output of an ultrasound transducer. It has been used to measure powere of between 1 mW and 10 W at frequencies from 1-5 to 3 MHz. Examples are given of results obtained for an ultrasound therapy unit and an ultrasonic pulse--echo scanner. Sources of inaccuracy are defined. It appears that constant-flow calorimetry offers a potentially very sensitive method for the absolute measurement of acoustic power.
热量计在蓖麻油流中吸收超声换能器输出声功率的一部分。它已被用于测量频率在1.5至3MHz之间、功率在1mW至10W之间的功率。给出了超声治疗设备和超声脉冲回波扫描仪的测量结果示例。确定了误差来源。看来恒流热量测量法为声功率的绝对测量提供了一种潜在的非常灵敏的方法。
