Abstract
It is important to be able to determine the ultrasonic power radiated by diagnostic equipment in the clinical environment, without unduly interrupting patient scheduling. This presentation describes a portable, thermal system which can measure ultrasonic power at diagnostic levels. This technique utilizes a nickel, parabolic reflector to focus the ultrasonic beam onto the sensing element, a thin-film thermistor. The “thermistor” is mounted on sound absorbing rubber, and the rise in temperature upon insonation is measured with a simple bridge circuit. One arm of the bridge is another thermistor mounted near the insonated chip but outside of the ultrasonic beam. Maximum sensitivity of this device is 100 μW average power and beams up to 0.75 in. diameter may be accommodated. Time for each measurement is approximately 5 min. The instrument was calibrated using a Mettler-balance radiation force method.
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