Abstract
The requirements for precise determination of acoustic output for different types of medical diagnostic equipment have made it important to develop methods of measuring ultrasonic field parameters at high megahertz range of frequencies. More specifically, of particular interest here is the measurement of pulsed beams of small focal diameters (of the order of a wavelength), generated by the low total power output devices. These low power levels are in general on the order of 50 μW, which is below the sensitivity of current acoustic power measurements methods including radiation force balances and calorimeters. While the miniature wideband polymer hydrophones have the requisite voltage sensitivity and bandwidth to correctly record the pressure waveforms, their finite dimensions, typically 0.5 to 1.0 mm in diameter, lead to spatial averaging effects. To overcome this problem, a technique has been developed, and is now being tested which permits hydrophones to be used in these applications. The measurement pr...
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