Patent ID: 9041937
Filing Date: 2015-05-26
Classification: G01B,G01K

Abstract:
1. An interference measurement device which measures an interference between measurement light emitted onto a measurement object, which comprises a front surface and a back surface, and reference light, the interference measurement device comprising: a light source for emitting supercontinuum light, the supercontinuum light comprising the measurement light to be emitted onto the measurement object and the reference light; a dispersion compensation element which comprises a material having substantially a same dispersion characteristic as that of the measurement object and which differs in thickness from the measurement object by an amount equal to or greater than a coherence length of the supercontinuum light, the dispersion compensation element comprising a front surface and a back surface; and a light detector for measuring an interference between the reference light reflected by the dispersion compensation element and the measurement light reflected by the measurement object; and a processor for measuring a first position of an interference peak caused by reflection on the front surface of the measurement object and the front surface of the dispersion compensation element, and a second position of an interference peak caused by reflection on the back surface of the measurement object and the back surface of the dispersion compensation element and for measuring a length difference between the first position and the second position, and for deciding a temperature or a thickness of the measurement object; wherein the supercontinuum light has a wavelength which is able to pass through the measurement object and the dispersion compensation element.