The distinct transient geometry and material response of a deforming glass surface during CO2 laser heating are related to the temperature history and the thermal regimes resulting from different energy deposition and heating rates. The transient deformation is measured using a probing system based on the photo thermal deflection technique. The variation with temperature of the optical constants yields a variable reflection signal which ultimately decreases, corresponding to a permanent volume expansion. The transient deflection signal associated with the variable deformation results from the distinct physical mechanisms in three thermal regimes, i.e., the elastic behavior, the glass transition, and the viscous flow regimes.
Measurement of the Transient Glass Surface Deformation During Laser Heating
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Shiu, T., Grigoropoulos, C. P., and Greif, R. (November 1, 1999). "Measurement of the Transient Glass Surface Deformation During Laser Heating." ASME. J. Heat Transfer. November 1999; 121(4): 1042–1048. https://doi.org/10.1115/1.2826054
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