Rain sensor with reference channel

Details Rain sensor with reference channel Rain sensor with reference channel

1989-01-18

1990-10-02

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

15250C, 250341, 318DIG2, G01N 2147

Patent

active

049609963

ABSTRACT:
A sensing assembly (10) for indicating when moisture or other particles have accumulated on a window (12) having inside (14) and outside (16) surfaces. The assembly includes an emitter (18) disposed on the inside surface (14) of the window (12) to emit infrared energy to the window (12). A detector (20) is disposed on the inside surface (14) to detect infrared energy from the window (12) on an egress axis. A reference detector (22) detects ambient light and emitter output which are parallel to the egress axis. A control circuit (24) receives the detected measurement level and reference level for comparison to actuate the wipers when rain or particles are on the window (12).

REFERENCES:
patent: 4355271 (1982-10-01), Noack
patent: 4365896 (1982-12-01), Mihalow
patent: 4636643 (1987-01-01), Nakamura et al.
patent: 4701613 (1987-10-01), Watanabe et al.
patent: 4713583 (1987-12-01), Hochstein
patent: 4798956 (1989-01-01), Hochstein
patent: 4859867 (1989-08-01), Larson et al.
patent: 4871917 (1989-10-01), O'Farrell et al.

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