Investigation on ultrasonic power measurement at AIST -radiation force balance method and its uncertainties

摘要

In this paper, the recent stage of the researches on "ultrasonic power measurement system" with the radiation force balance method and its basic estimations of uncertainties at AIST are described. The purpose of this project is to establish the ultrasonic power standard in Japan. At first, the outline of the radiation force balance method constructed at AIST is described. Next, the authors show some basic estimations for uncertainties, (1) the alignment errors between the target and the transducer, (2) influence of contact between the transducer and water tank, and (3) comparison between the continuous waves and the burst-waves. These are the some of the basic evaluations of the uncertainty of the radiation force balance method.