Patent ID: 7897110
Filing Date: 2011-03-01
Classification: G01N,Y10T

Abstract:
1. A system for detecting at least one contamination species in an interior space of a lithographic apparatus, the system comprising: at least one monitoring surface in contact with the interior space; a thermal controller that controls the temperature of the monitoring surface to at least one detection temperature, the detection temperature being less than or about a saturation temperature of the at least one contamination species at which condensation occurs when a pressure of the at least one contamination species exceeds a given threshold pressure; and further wherein the thermal controller comprises a memory to store the threshold pressure or threshold related data of each contamination species, and wherein the thermal controller is configured to determine each respective saturation temperature from the threshold pressure or threshold pressure related data of each contamination species, and at least one condensation detector that detects condensation of the at least one contamination species onto the monitoring surface.