Thermal Diffusivity by Electron Bombardment Heating

A method is developed for determining the thermal diffusivity of materials by heating with an electron beam. A solution of the heat transfer equation is obtained for the case of a finitely thick, infinitely wide slab, and the expression for the temperature‐wave phase shift is given. Using an experimental measurement of the temperature‐wave phase shift, values of diffusivity in Al2O3 and carbon were determined. The accuracy of the method should be within ±10%.