Novel finite pulse-width correction in flash thermal diffusivity measurement

Abstract

A new method for obtaining correct thermal diffusivity values in flash measurement has been developed. This consists of two steps: (1) adjustment for an ’’effective’’ irradiation time using the center of gravity of pulse, and (2) the correction for the deviation in the parameter K from the ideal value, 0.1388. We have found that after the adjustment for the ’’effective’’ irradiation time, no further correction is needed for any form of pulse, even for very short t1/2 such as t1/2 = 2 τ.