Thermal distortion modeling of mirrors based on experimental data

Abstract

Mirrors are modeled to match test results from the Thermal Distortion Test Facility (TDTF) at Kirtland AFB, Albuquerque, N.M. The model allows distortions resulting from realistic beam profiles to be accurately calculated from a closed-form five-parameter equation. The basic modeling concepts as well as the model's capabilities are discussed. A comparison of model distortion predictions with observed distortions resulting from a high-energy laser beam is made.

Heat Transfer and Thermal Deformation Characteristics of Liquid-Cooled Laser Mirror

“…Later, to achieve a higher precision, the analytical solution for the temperature distribution of mirrors was obtained by using integral transform technique [9], Green's functions [10,11], finite difference method [12], and finite 2 Advances in Mechanical Engineering element method [13]. In the previous studies, the fluid flow and conjugated heat transfer process on the interface were assumed to be homogeneous process for simplifying the calculation.…”

“…Initially, for acquiring the temperature field, the average heat transfer coefficient calculated from empirical formulas was employed to solve the heat conduction equation [6–8]. Later, to achieve a higher precision, the analytical solution for the temperature distribution of mirrors was obtained by using integral transform technique [9], Green's functions [10, 11], finite difference method [12], and finite element method [13]. In the previous studies, the fluid flow and conjugated heat transfer process on the interface were assumed to be homogeneous process for simplifying the calculation.…”