Real-time monitoring of ceramic sintering with laser ultrasonics.

摘要

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. 7 refs., 5 figs.