Summary
A Fabry-Perot Doppler interferometer that directly measures elastic waves from rough, optically diffuse, surfaces of materials has been constructed at the Idaho National Engineering Laboratory (INEL). This apparatus, coupled with a pulsed laser for elastic wave generation, is currently being used for real-time monitoring of the sintering of zinc oxide. From the ultrasonic propagation measurements, actual densities and shrinkage values can be calculated as the material sinters; the algorithm requires previous knowledge of the ultrasonic velocity dependence on density and assumptions concerning the method of shrinkage in the material.
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References
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Telschow, K.L. (1991). Real-Time Monitoring of Ceramic Sintering with Laser Ultrasonics. In: Ruud, C.O., Bussière, J.F., Green, R.E. (eds) Nondestructive Characterization of Materials IV. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0670-0_13
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DOI: https://doi.org/10.1007/978-1-4899-0670-0_13
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