Lens system for moisture sensor device

Details Lens system for moisture sensor device Lens system for moisture sensor device

1993-01-19

1994-01-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, G01N 1506

Patent

active

052784258

ABSTRACT:
A moisture sensor device for detecting the degree of wetting of a transparent pane by drop-shaped precipitation. The sensor device is provided with a beam guide element, which is affixed to the pane by an optical adhesive. A beam transmitter and a beam receiver are each associated with a lens. Such a sensor device solves the problem of guaranteeing optimum conditions for the generation and output of rays into and out of a beam guide element. Aspherical lenses are associated with and arranged at a short distance from the beam transmitter and the beam receiver. Each lens has a surface facing the beam transmitter or beam receiver which in outline is fashioned according to a polynomial selected to be equal to or greater than the third degree and is developed to form a body of rotation.

REFERENCES:
patent: 5039490 (1991-08-01), Marsoner et al.
patent: 5048952 (1991-09-01), Miyata et al.

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