Windshield soil detector
First Claim
1. A glass pane soil indicator for detecting water, dirt or the like on the exposed surface of the pane comprising a portion of said pane having exposed and unexposed surfaces normally free of any substance, a light source, a photometer, means for directing the light from said source through the unexposed surface of the pane to the exposed surface, an optical system for directing light returned through the pane to pass to the photometer, said photometer being arranged to receive only light leaving the exposed pane surface at the angle of total reflection, and means responsive to the output of the photometer for indicating the condition of the exposed glass surface.
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Accused Products
Abstract
A device for indicating the soiling of a sheet of glass or windshield comprising a source that emits light through the windshield onto the soiled surface at the angle of total reflection, a photometer that registers the changes caused in the light returned through the glass as the result of the soiling of the windshield, and an indicating device or signal transmitter connected to the photometer.
43 Citations
6 Claims
- 1. A glass pane soil indicator for detecting water, dirt or the like on the exposed surface of the pane comprising a portion of said pane having exposed and unexposed surfaces normally free of any substance, a light source, a photometer, means for directing the light from said source through the unexposed surface of the pane to the exposed surface, an optical system for directing light returned through the pane to pass to the photometer, said photometer being arranged to receive only light leaving the exposed pane surface at the angle of total reflection, and means responsive to the output of the photometer for indicating the condition of the exposed glass surface.
Specification