Output details

A nonlinear propagation model-based phase calibration technique for membrane hydrophones

Significance of output:

The calibration of diagnostic ultrasound systems relies on the use of membrane hydrophones to accurately measure the pressure generated in water. As a result of nonlinear propagation the waveforms are distorted with significant harmonic content. Normally only the amplitude response of hydrophones is measured. This work demonstrated a technique for measuring the phase response of hydrophones up to 100 MHz. It enables hydrophones to be fully calibrated and permits the true waveform, and therefore pressure, in water to be determined. This has implications for the prediction of pressure waveforms in the body and safety assessments for medical ultrasound.