Ultrasonic Doppler probe assessment by scanned hydrophone.

A method is described for using a scanned hydrophone to assess the transmit-receive response of ultrasonic Doppler transducers. The method was used on batches of six probes at each of the nominal resonant frequencies of 2, 4 and 8 MHz. The method has the advantage of showing unwanted field characteristics and identifying the element that may be causing them. The resonant frequencies and the overall sensitivities of the elements and probes are determined, the latter varying by as much as a factor of two.