화학공학소재연구정보센터
International Journal of Heat and Mass Transfer, Vol.118, 562-569, 2018
A model to calculate the laser absorption property of actual surface
Research on absorption rate could contribute to better understanding laser processing. In this paper, a mathematical model was developed to calculate the laser absorption rate of actual surface considering the fractal characteristic. Fractal parameters were determined based on the measured characteristic of surface roughness, surfaces that met the fractal nature were then built. A light tracing algorithm was developed to trace the route of light in multiple reflections through the surface rough structure, and the Fresnel equation was used to calculate the fraction of the absorbed light at each reflection. The experiment system to measure the absorption rate of blue laser in hardening based on the water calorimetric method was developed. The experimental absorption rate fit well with the theoretical value, verifying the model as a tool to calculate the absorption rate in laser hardening. (C) 2017 Elsevier Ltd. All rights reserved.