Experimental Study on Temperature Distribution of a Wood Flame Using a Two-color Method

Abstract

In this paper, a two-color method to determine temperature distributions using color cameras was proposed. Based on Planck’s Law, the relationship between the emissivity and local absorption coefficients, and Rayleigh approximation, the relationship between the intensities captured by two optical channels was established, thereby forming the two-color method’s implementation basis. According to the established relationship, a simplified equation was used to approximately determine the temperature and a relative parameter in the relationship, thus determining the initial values for the following iterations. Using a Newton-type iterative method, based on the established relationship, the temperature and relative parameter were iteratively corrected until convergence. A wood flame was experimentally investigated using the proposed method, the distributions of temperature and emissivity were presented.