Patent ID: 7407325

Claim:
A method for measuring thermophysical properties that comprises the following sequential steps: rapid resistive self-heating of a specimen by using a heating current; adjusting the heating current to maintain the specimen at a target temperature; emitting a light to the specimen heated by the rapid resistive self-heating of the specimen while maintaining the heating current at the same value as that which maintained the specimen at a target temperature before emitting the light to the specimen; measuring a temperature change of the specimen induced by emitting the light to the specimen; deriving a thermal diffusivity of the specimen from the temperature change induced by emitting the light to the specimen; measuring a temperature of the specimen when the temperature of the specimen is held at a constant temperature before emitting the light to the specimen; an electric power that is supplied to the specimen when the temperature of the specimen is held at the constant temperature; and a temperature change of the specimen induced by the rapid resistive self-heating of the specimen; deriving a hemispherical total emissivity of the specimen from the temperature and the electric power; and deriving a specific heat capacity of the specimen from the hemispherical total emissivity and the temperature change induced by the rapid resistive self-heating of the specimen; wherein the temperature of the specimen is controlled under a feedback control so as to have the constant temperature until just before emitting the light to the specimen.