D211 Prediction of Heat Generation Rates of a Small Magnetic Sphere under High Frequency Magnetic Field using Near-Infrared Absorption Imaging Method

Abstract

This paper presents a novel method for reconstructing the temperature distributions of water around a small heated sphere and predicting the heat generation rates of the sphere. This method is based on the temperature dependence of the absorbance of water at the wavelength of 1150 nm. Absorbance images at 1150 nm were obtained when a 1 mm diameter steel sphere located in water contained in a glass cell with a light path length of 10 mm was heated by a 760 kHz alternating magnetic field. Inverse Abel transform is applied to the line profiles of the absorbance, and radial temperature distributions are reconstructed. The heat generation rates calculated from these temperature distributions well agree with induction heating power levels.