Patent ID: 6963403

Claim:
A method for calculating the emittance of materials at ambient temperatures from specular and diffuse reflectance, comprising: (a) obtaining input parameters of wavelength (λ), refractive index (n), extinction coefficient (k) and angle of incidence (θ) from a user; (b) calculating an absorption coefficient (α) based on λ and k; (c) prompting the user to choose between calculation of specular reflectance and calculation of diffuse reflectance; (d) if specular reflectance is selected by the user, calculating a parallel component of specular reflectance (Rs), perpendicular component of specular reflectance (Rp), and calculating the mean of the parallel and the perpendicular components to obtain the specular reflectance; (e) if diffuse reflectance is selected, prompting the user to select between K-M Method and statistical method; (f) if K-M method is selected by the user, obtaining scattering coefficient (S) from the user and calculating diffuse reflectance; (g) if statistical method is selected, obtaining grain size from the user and calculating external reflection coefficient (m e ) and internal reflection coefficient (m i ); (h) calculating the diffuse reflectance using any one of the following four statistical methods: (i) Simplified particle model theory, (ii) Modified particle model theory, (iii) Plane parallel plate theory, and (iv) Melamed theory; and (i) calculating the emittance based on the calculated specular and diffuse reflectance.