Temperature Gradients and Materials Properties Measurements using Ultrasonic Guided Waves

A novel technique for the measurement of Elastic Moduli of materials as well as measurement of temperature gradients using ultrasonic waveguides is described here. The range of temperature measurement was from room temperature to maximum utility temperature of waveguides or maximum measurable value of thermocouple temperature, typically beyond 1000°C. In this work, thermocouple wires have been used as a wave guide subsequently time of flight and temperature data was collected from laboratory experiments from 45°C to 1100°C. The changes in sound speed can be determined through the time of flight variations of the wave that also depends on the particular geometry of waveguide.