Patent ID: 8825434
Filing Date: 2014-09-02
Classification: G01B,G01K

Abstract:
1. A temperature measuring method comprising: transmitting a light from a light source to a measurement point of an object to be measured, the object being a substrate on which a thin film is formed; measuring a first interference wave caused by a reflected light from a surface of the substrate, and a second interference wave caused by reflected lights from an interface between the substrate and the thin film and from a rear surface of the thin film; calculating an optical path length from the first interference wave to the second interference wave; calculating a film thickness of the thin film based on an intensity of the second interference wave; calculating an optical path difference between an optical path length of the substrate and the calculated optical path length, based on the calculated film thickness of the thin film; compensating for the optical path length from the first interference wave to the second interference wave based on the calculated optical path difference; and calculating a temperature of the object at the measurement point based on the compensated optical path length.