Patent ID: 6545279
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A surface state monitoring apparatus comprising:an incidence optical system for introducing infrared radiation into a substrate-to-be-monitored via a declined face of a peripheral edge of the substrate-to-be-monitored; a detection optical system for detecting the infrared radiation undergoing multiple reflections inside the substrate-to-be-monitored and exiting from the substrate-to-be-monitored; a surface state monitoring means for monitoring a surface state of the substrate-to-be-monitored, based on infrared radiation detected by the detection optical system; a position detecting means for optically detecting a position of the substrate-to-be monitored; and a control means for controlling a position and an angle at which the infrared radiation is incident on the substrate-to-be-monitored, corresponding to the position of the substrate-to-be-monitored detected by the position detecting means, wherein the position detecting means optically detects a position of the substrate-to-be-monitored in consideration of a configuration of the declined face of the peripheral edge of the substrate-to-be-monitored.