Optical droplet sensor and method

Details Optical droplet sensor and method Optical droplet sensor and method

2006-03-16

2009-02-17

Lauchman, L. G (Department: 2877)

Optics: measuring and testing

Of light reflection

C356S448000, C356S237500, C250S227180, C250S341800, C250S574000

Reexamination Certificate

active

07492459

ABSTRACT:
An optical droplet sensor can include a light emitter, a light receiver and a light guide, and can be adhered onto an inner surface of a windshield via a light transmissive adhesive layer. The light guide can include a light entry surface and a light exit surface formed of respective convex-shaped arbitrary curved surfaces, a light entry/exit surface formed of a flat plane, and a reflecting surface that can be made of a metal film. The light emitted from the light emitter is given an optimized light distribution at the light entry surface and introduced into the light guide. The light is then reflected from the metal film-applied reflecting surface toward an outer surface of the windshield. The light totally reflected at the outer surface returns to the light exit surface and is given an optimized light distribution at the light exit surface. The light is then externally transmitted/released from the light guide and collected on a light-receiving surface of the light receiver.

REFERENCES:
patent: 5661303 (1997-08-01), Teder
patent: 6627910 (2003-09-01), Ishino et al.
patent: 6855947 (2005-02-01), Graves et al.

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