G. S. K. Wong
Acoust. Standards, Inst. for Natl. Measurement Standards, Natl. Res. Council Canada, Ottawa, ON K1A 0R6, Canada
A system for the absolute measurement of high-power ultrasound in the range from 0.5 to 30 W is described. The theory of the system is based on measuring the ultrasound radiation force exerted on a conical-float suspended in water. The system is fully automated with the aid of the IEEE-488 bus under the control of a computer. Measurement procedures and an uncertainty audit representing a confidence level of approximately 95% are presented.