National Physical Laboratory

Ultrasonic power measurement

NPL provides services for hospitals and industry, through the calibration of radiation force balances for determining ultrasonic output power, and the measurement of ultrasonic power itself, produced by customer systems ranging from prototype transducers to reference sources. The services have recently been extended to measure power at human body temperature and a Good Practice Guide for power measurement has also been produced.

High Intensity Focused Ultrasound (HIFU), used clinically for treating a wide range of cancers, is a rapidly growing field, and new measurement methods are now in place at NPL to determine HIFU-level powers. The technique has been tested successfully at power levels in excess of 300 W.

NPL has developed a novel solid-state approach for measuring ultrasonic power, based on the pyroelectric effect. The technique has been validated at physiotherapy levels, and research will continue at diagnostic output levels.

Best Practice Guide to Measurement of Acoustic Output Power

Last Updated: 24 Aug 2016
Created: 29 May 2007


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