Accession Number : ADA309958

Title :   The Mathematical Foundation and the Boundary Conditions Encountered in Laser Energy Diffusion in a Solid and Skin Simulant Temperature Rise.

Descriptive Note : Final rept. Nov 94-Oct 95,

Corporate Author : ARMY NATICK RESEARCH AND DEVELOPMENT LABS MA CLOTHING EQUIPMENT AND MATERIAL S ENGINEERING LAB

Personal Author(s) : Wang, Chia P.

PDF Url : ADA309958

Report Date : JUN 1996

Pagination or Media Count : 26

Abstract : The energy diffusion from a laser beam in a solid was critically analyzed and the solutions were applied to the problem of temperature rise of a skin simulant irradiated with a laser beam. The solutions involved two sets of contradicting boundary conditions: The zero surface heat flux vs the constant surface heat flux at the boundary. It is shown that the constant surface heat flux boundary condition in the conventional solution of the diffusion equation is unrealistic for a laser beam. Justification for the zero surface heat flux boundary condition for laser irradiation is presented along with the calculations for the temperature rise of a laser irradiated skin simulant. For laser exposures of 1000, 400, 100, 50 and 20 uS, the values of the surface temperature rise given by the constant surface heat flux solutions are higher by a factor of 2.2, 2.8, 4.9, 6.6 and 9.8, respectively, than that given by the zero surface heat flux solution. The analysis holds for the general case of other irradiated solids.

Descriptors :   *LASER BEAMS, *HEAT FLUX, MATHEMATICAL MODELS, HIGH TEMPERATURE, ENERGY TRANSFER, BOUNDARIES, LASER APPLICATIONS, TEMPERATURE GRADIENTS, THERMAL ANALYSIS, THERMAL DIFFUSION, THERMAL CONDUCTIVITY, EYE SAFETY, PARTIAL DIFFERENTIAL EQUATIONS, LASER SAFETY, IRRADIATION, EXPOSURE(PHYSIOLOGY), LASER HAZARDS, SURFACE TEMPERATURE, SKIN(ANATOMY).

Subject Categories : Lasers and Masers
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE