Real-Time Monitoring of Ceramic Sintering with Laser Ultrasonics
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.
KeywordsZinc Oxide Ultrasonic Velocity Thermoelastic Generation Ultrasonic Wave Velocity Longitudinal Ultrasonic Wave
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