No.4（2001）20.A simple measurement instrument of ultrasonic power for ultrasonic therapy

Hiroshi Okano and Hiroshi Kawamura

Ultrasonic power of an ultrasonic therapy apparatus should be measured at the point of the transducer, since the measurement value at that point reflects the effect of therapy and the safety of using the apparatus. However, expensive instrument is needed to measure the ultrasonic power precisely, and complicated and delicate adjustment is indispensable for using the instrument. Therefore users of the instrument such as doctors, are asking for a more simple measurement instrument using ultrasonic power. We discussed practical and simple measurement method. The ultrasonic power of the apparatus is beamed to the top of a conical float which is floating on the degassed water in the cylindric tank. The ultrasonic power is calculated from the measurement results of the sinking velocity of the float. We compared the measurement result obtained by this simple instrument with that obtained by a normally used precision instrument. Both results had good agreement.

Keywords
Simple measurement method, Ultrasonic power, Transducer, Therapy, Safety of using, Conical float, Velocity

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