Abstract
The use of lasers for both generation and detection of elastic waves in materials has opened the possibility of real‐time monitoring of material elastic parameters during processing. At the INEL, a laser Doppler interferometer has been constructed that allows direct measurement of elastic waves from rough and/or optically diffuse surfaces. This apparatus, coupled with a pulsed laser for elastic wave generation, is currently being used for totally noncontacting, real‐time, monitoring of the sintering of ceramics. Results will be presented on the densification of materials as a function of sintering time and temperature. Both the longitudinal and shear wave velocities in these materials have been found to vary approximately linearly with the densification up to nearly total theoretical density. Mechanisms of the generation and detection of these elastic waves, as well as propagation in porous materials, will be discussed. [This work was supported by the Department of Interior's Bureau of Mines under Contrac...
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