Patent ID: 9046417
Filing Date: 2015-06-02
Classification: G01J

Abstract:
1. A temperature measuring system for measuring a temperature of an object having a first main surface and a second main surface facing the first main surface, the temperature measuring system comprising: a light source which generates measuring light having a wavelength transmittable through the object; a spectroscope which measures an intensity distribution depending on a wavelength or a frequency; an optical transfer mechanism which is connected to the light source and the spectroscope to emit the measuring light from the light source to the first main surface of the object and emit light reflected from the first main surface and the second main surface to the spectroscope; an optical path length calculation unit which calculates a length of an optical path by Fourier transforming an interference intensity distribution that is an intensity distribution of the reflected light from the first main surface and the second main surface measured by the spectroscope; and a temperature calculation unit which calculates the temperature of the object based on the optical path length calculated by the optical path length calculation unit and a relation between optical path lengths and temperatures of the object, which are measured in advance, wherein the light source is configured to have a half-width at half-maximum of a light source spectrum which is determined based on a wavelength span of the spectroscope, and the spectroscope is configured to measure the intensity distribution by using number of samplings which is determined based on the wavelength span of the spectroscope and a maximum thickness of the object to be measured by the temperature measuring system, wherein the light source is configured to have a light source spectrum satisfying following equation, where Δw denotes the wavelength span, and Δλ denotes a half-width at half-maximum of the light source spectrum, and wherein the spectroscope is configured to measure the intensity distribution by using the number of samplings, which satisfies following equation, where λ 0 denotes a central wavelength of the light source, Δw denotes the wavelength span, n denotes a refractive index of the object, d denotes a maximum thickness of the object to be measured by the temperature measuring system, and N s denotes the number of samplings.