Solar reflection and thermal radiation multilayer film and a method of designing a solar reflection and thermal radiation multilayer film

摘要

Thermal control films are preferably used in space, a method of designing a multi-layer film is provided in particular. To constitute (a) a multilayer film, at least candidates of the two materials, and steps for setting the number of layers of the multilayer design method; are and (b) a genetic algorithm, At least (b-1), Number of individuals (n), Selection method, Crossover rate, and crossover and methods Step of setting the mutation rate, An initialization step of generating only a number of the individual set of the first generation with a number of layers which is (b-2) setting, Loop steps individuals reach a predetermined evaluation criterion (b-3) the number of generations, or until the number of generations until a predetermined obtained, repeat sub-steps: (i) ~ in (iii) (i) generating evaluation step of evaluating the evaluation function, the n individuals that have been; Selection step based on (ii) the evaluation, the n individuals, selecting an individual is subject to the next step; from an individual and is (iii) selection, crossover rate and crossover methods are set, and setting According mutation rate that is, has a next generation step of generating a next generation population of the n Is the evaluation function, (Evaluation function 1) αs = 1-Rs (However, in the emission wavelength range of sunlight, Rs is. Representing the reflectance of solar energy in the wavelength range of interest in the design) (Evaluation function 2) εH The (a εH = 1-R _IR, within the wavelength range of thermal radiation, R _IR is. representing the reflectivity of thermal radiation energy in the wavelength range of interest in the design) Further comprising the step of using the genetic algorithm is to design a combination of thickness and candidate materials.