New high temperature and broadband magnetostrictive and piezoelectric ultrasonic transducers have been developed for testing, measurement and control. Potential reactor applications include measuring fuel centerline temperature, sodium temperature profile (ten points with only one wire), occurrence and location of bubbles in liquid coolants, liquid level, flow, gas pressure, nondestructive testing and acoustic emission surveillance.
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Lynnworth et al. (1971) studied this question.
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