Thanh Duy Ho

US Patent:

47975490, Jan 10, 1989

Filed:

Nov 9, 1987

Appl. No.:

7/118474

Inventors:

Thanh Ho - Indianapolis IN
Gerald T. Fattic - Anderson IN

Assignee:

General Motors Corporation - Detroit MI

International Classification:

H01J 516

US Classification:

250227

Abstract:

An optical sensor has a gap for a toothed modulator wheel and accurately aligned optical fibers on either side of the gap. The fibers form a U-shape to allow compact sensor design. The sensor is fabricated by inserting a single optical fiber in a mold and supporting the fiber in a U-shape such that the bottom of the U bend includes a straight portion. A thermosetting material is molded around the fiber to form a body and encapsulsate the fiber. A gap is formed by excluding or removing the resin from the region of the straight portion. A part of the straight portion of the fiber at the gap is removed so that the remaining spaced ends are inherently aligned across the gap.