Abstract
Abstract It is desirable to be able to measure power output of diagnostic ultrasonic transducers for both technical and biological reasons. Design criteria for an instrument to fulfill this purpose on a routine basis are suggested. Previous approaches are discussed in relation to these criteria and a new instrument design is presented. This is based on a measurement of radiation force using a null system, with a magnetic restoring force controlled by a pair of photo-detectors. The method of calibration is described and a selection of field results obtained with the prototype instrument are presented. Methods for applying the same principal to beam plotting, and modifying the instrument for use with therapy machines are also described.
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