Patent ID: 7033070
Filing Date: 2006-04-25
Classification: C30B,G01J,Y10T

Abstract:
1. A temperature measuring method of measuring temperature of a heated substance in a furnace in which crystals are grown using a floating zone method including a high-luminance light source as a heating source, comprising the steps of: illuminating said heated substance with a high luminance light source comprising a halogen lamp having a peak wavelength of about 1 micrometer; introducing light to a temperature measuring apparatus from the heated substance via an optical path tube made of carbon and extending to the heated substance said optical path tube extending substantially horizontally of said heated substance, measuring luminance of the light introduced via the optical path tube using an image receiver comprising a CCD camera, filtering light entering the CCD camera with a wave length cut filter to interrupt light in a predetermined wavelength range from about 1.0 to about 15.0 micrometers; further filtering light entering the CCD camera with a band-pass filter to extract substantially all light in a predetermined wavelength range from about 0.7 to about 1.1 micrometers; and calculating temperature of the heated substance according to the luminance.