Patent ID: 6476393
Filing Date: 2002-11-05
Classification: G01J,G01N,H01L

Abstract:
A surface state monitoring apparatus comprising:a first infrared radiation condensing means for condensing infrared radiation emitted by an infrared radiation source on an outer peripheral part of a substrate-to-be-monitored and introducing the infrared radiation into the substrate-to-be-monitored; an incident angle control means for controlling an incident angle of the infrared radiation condensed by the first infrared radiation condensing means, which enters the substrate-to-be-monitored to be fixed to a prescribed value or to be variable; a second infrared radiation condensing means for condensing the infrared radiation which has undergone multiple reflection in the substrate-to-be-monitored and exits the substrate-to-be-monitored; an infrared radiation detecting means for detecting the infrared radiation condensed by the second infrared radiation condensing means; and an infrared radiation analyzing means for analyzing the infrared radiation detected by the infrared radiation detecting means to measure contaminants staying on the surfaces of the substrate-to-be-monitored.