Patent ID: 8772702
Filing Date: 2014-07-08
Classification: G08B

Abstract:
1. A detector, comprising: a housing with at least one window for allowing radiation to enter; at least one outlook sensor for sensing the radiation entering via said window; a unit for processing outlook sensor signals; outlook mirrors shaped and mounted in said housing for reflecting onto said outlook sensor the radiation entering via said window from outside detection zones better than the radiation entering via said window from elsewhere, at least some of said outlook mirrors face said window and in operative orientation neighbor each other vertically; a window sender; at least one window sensor for sensing radiation indicative of said window being masked or having been damaged, said unit additionally processing window sensor signals output by said window sensor; a gap between at least two of said outlook mirrors allowing the radiation indicative of said window being masked or having been damaged to travel between said window and said at least one window sensor or said window sender or both; and from a perspective of said outlook sensor, some space of said gap being shaded by an outlook mirror being more closely mounted to said outlook sensor of said at least two outlook mirrors defining said gap, such that said gap extending in a vertical direction for allowing said window sensor or said window sender behind said outlook mirrors sufficient sight of a majority part of said window in front at no or negligible optical deterioration namely without essential loss of energy yield.