A remote laser system for ultrasonic velocity measurement at high temperatures
- 15 February 1988
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 63 (4), 1225-1227
- https://doi.org/10.1063/1.339987
Abstract
The temperature dependence of the longitudinal ultrasonic velocity in iron and Dural has been obtained using a totally remote laser technique. The ultrasound is generated by irradiation of one face of a sample with a Q-switched Nd:YAG laser pulse and is detected on the opposite face using a modified Michelson laser interferometer. The system has proved capable of measurements up to temperatures in excess of 1000 °C, with an absolute accuracy in velocity of ±1%, and relative accuracies of better than 0.1%. Anomalies in the data for iron have been discerned at the Curie temperature of ∼768 °C, due to the ferromagnetic to the paramagnetic phase transition, and at 910 °C due to the crystallographic phase transition from ferrite to austenite.Keywords
This publication has 7 references indexed in Scilit:
- Ultrasonic measurement of internal temperature distributionPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1986
- Microstructural monitoring by laser-ultrasonic attenuation and forward scatteringNDT International, 1986
- Surface Acoustic Wave Interactions with Cracks and Slots: A Noncontacting Study Using LasersIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1986
- Quantitative measurements of laser-generated acoustic waveformsJournal of Applied Physics, 1982
- Techniques for the generation of ultrasound for extended periods at high temperaturesUltrasonics, 1979
- Ultrasonic Attenuation and Velocity in Hot Specimens by the Momentary Contact Method with Pressure Coupling, and Some Results on Steel to 1200°CThe Journal of the Acoustical Society of America, 1972
- Single-Crystal Elastic Moduli and the hcp → bcc Transformation in Ti, Zr, and HfPhysical Review B, 1964