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利用激光干涉仪，绝对测定超声换能器表面的振动位移（振速）并由此而确定超声换能器的辐 射声功率．对一增幅杆型的超声换能器辐射声功率测量的实验结果表明，在本文的声功率测量范围 内，空化对换能器表面的振动位移测量影响不大，而且该换能器的电声功率转换效率经实验测定可 达到０．４０．
The use of laser interferometer, the absolute determination of the ultrasonic transducer surface vibration displacement (vibration speed) and thus determine the ultrasound transducer radiating sound power. Experimental results on the radiated sound power of an amplified rod-type ultrasonic transducer show that the cavitation has little effect on the vibration displacement measurement of the transducer surface within the range of the acoustic power measurement in this paper, and the power of the transducer Acoustic power conversion efficiency is experimentally determined to reach 0.40.