Joo, Y Park, H Chae, HB Lee, JK Baik, YJ 2024-01-21T12:41:55Z 2024-01-21T12:41:55Z 2021-09-05 2001-03 0195-928X https://pubs.kist.re.kr/handle/201004/140687 The measurement of thermal diffusivity for thin slabs by a converging thermal have technique has been studied. Temperature variation at the center of the heat source ring that is produced by a pulsed high-power laser is detected by an infrared detector. A computer program based on the finite difference method is developed to analyze the thermal diffusivity of the slabs. Materials of both high thermal diffusivity (CVD diamond wafer) and loa thermal diffusivity (stainless-steel foil) have been used for the measurements. The measurements have been performed bq varying the size and the thickness of specimen. The converging thermal wave technique has proved to be a good method to measure the thermal diffusivity of a CVD diamond without breaking the wafer into small specimens. The technique can be applied For a small slab if the diameter of the slab is two times larger than that of the heat source ring. The sensitivity of thickness in measuring the thermal diffusivity is low for ordinary CVD diamond. The use of the converging thermal wave technique for nonhomogeneous, nonuniform, and anisotropic materials has been accomplished by applying the finite difference method. English KLUWER ACADEMIC/PLENUM PUBL FILMS Measurements of thermal diffusivity for thin slabs by a converging thermal wave technique Article 10.1023/A:1010743419225 1 INTERNATIONAL JOURNAL OF THERMOPHYSICS, v.22, no.2, pp.631 - 643 INTERNATIONAL JOURNAL OF THERMOPHYSICS 22 2 631 643 scie scopus 000168864600024 2-s2.0-10844274130 Thermodynamics Chemistry, Physical Mechanics Physics, Applied Thermodynamics Chemistry Mechanics Physics Article; Proceedings Paper FILMS converging thermal wave technique CVD diamond finite difference method thermal diffusivity