Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1988-04-19
1989-10-03
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
15250C, 250339, 250349, G01N 2141
Patent
active
048719170
ABSTRACT:
A moisture sensing assembly for controlling vehicle accessories such as windshield wipers is mounted on the inner surface of a vehicle window or windshield for detecting moisture on the outer window surface. A plurality of infrared energy emitting diodes and a sensor for receiving reflected infrared energy from the window and any moisture thereon are mounted at predetermined angles and spacing in a support. The support is biased against the window and enclosed in a protective housing detachably mounted to a window mounted plate preferably adjacent a rearview mirror on the front windshield. The support preferably includes an infrared energy monitoring sensor adjacent the emitting diodes which may be combined with or separate from an ambient infrared energy sensor. The monitoring and ambient sensors provide reference energy levels allowing compensation for varying diode output due to temperature and age and varying external vehicle light conditions.
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U.S. patent application 073,469 by Hochstein, filed Jul. 15, 1987, entitled Electro-Optical Windshield Moisture Sensing, [U.S. Pat. No. 4,798,956].
Bentley Richard D.
Hanft Karl-Heinz
Larson Mark L.
O'Farrell Desmond J.
Schierbeek Kenneth L.
Donnelly Corporation
Hannaher Constantine
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