Abstract
The Sokolov ultrasonic image converter provides a simple real time imaging system capable of good resolution and range in turbid water conditions. The tube is operated with anode potential target stabilisation and capacitive signal collection. Spurious signals at the ultrasound frequency are generated because of the stray capacitance of the scanned quartz surface. These signals are separated by modulating the electron beam at a different frequency and employing a head amplifier tuned to the intermediate frequency. Displayed images are free from fringes due to spurious signals and are unaffected by Doppler frequency shift. Factors which affect the resolution of an ultrasonic visualisation system are discussed.
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