Ultrasound power and radiation force balance

Best practice measurement of acoustic output 

A radiation force balance is used to determine the output power of a transducer system. We can measure the output power generated by transducers and reference sources, such as those produced by NIST and Precision Acoustics, to standard IEC 61161:

  • Over the range 1 mW to 20 W, between 1 MHz and 20 MHz, using radiation force balances
  • At HIFU levels (reaching over 300 W), typically between 1 MHz and 5 MHz, by the buoyancy change method based on the thermal expansion of castor oil

Power measurement devices can be calibrated for power levels up to:

  • 1 W by comparison with our Primary Standard Balance, for frequencies up to 25 MHz
  • 20 W by comparison with our Secondary Standard Balance, for frequencies up to 5 MHz

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