Application of the Parker flash method to high temperature thermoelectricsMathematical aspects of thermal diffusivity measurements are reviewed and applied to develop an experimental setup at JPL. Certain approximations commonly appearing in the literature are examined in some detail and rejected based upon sensitive slope variations having significant impact on the results. The final mathematical formulation used was one developed by Parker et al. (1961), which evaluated the diffusivity in a way that could be simply evaluated by examining an oscilloscope trace. A computer algorithm was written to examine solution sensitivity to the number of terms taken in the infinite series. The mathematical technique is being used at JPL to evaluate diffusivities of graphite, Boron Carbon and Lanthanum Sulphur compounds in the temperature range of 300 K to 1200 K.
Document ID
19840047254
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Noon, E. L. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)