LASER-FLASH DIFFUSIVITY MEASUREMENT OF DIAMOND FILMS

A laser-flash technique with fast infrared detection for the measureme nt of the normal diffusivity of samples, with a thickness in the range 200 to 700 mu m, is presented. The experimental apparatus for such a measurement is described. Some points specific to the diffusivity meas urement of semi-transparent and highly conductive materials such as di amond are discussed. Particularly, difficulties in connection with the good conductivity and low thickness of the samples we consider are po inted out. Finally, experimental results performed within the framewor k of the Diamond Round Robin 2 tests for both nondiamond and diamond f ilms are presented and the influence of the coupled conductive-radiati ve heat transfer is shown.