Patent ID: 7380980
Filing Date: 2008-06-03
Classification: G01N

Abstract:
1. A detector for detecting a state on a detection surface, comprising: a prism which includes a first surface as a detection surface; light-emitting means for applying light to the detection surface through an interior of said prism; light-receiving means for receiving reflected light of light applied from said light-emitting means to the detection surface; state detection means for detecting a state on the detection surface on the basis of the reflected light received by said light-receiving means; and cooling means, provided on a second surface of said prism which serves as an exit surface of light to said light-receiving means, for cooling said prism, wherein said state detection means detects moisture produced on the detection surface of said prism which is cooled by said cooling means, on the basis of the specular reflection received by said light-receiving means.