Abstract
Temperature measurement using an ultrasonic sensor consisting of a piezoelectric transducer and an ultrasonic waveguide is presented. The waveguide is a clad rod consisting of a steel core and a stainless steel cladding together with two discontinuities created near the probing end. The temperature information is obtained from information about the time delay between the ultrasonic echoes reflected from these discontinuities and the probing end surface as a function of the temperature. The temperature measured ultrasonically is in good agreement with that obtained by using a commercial thermocouple.
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