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Title: Fiber optic probe having fibers with endfaces formed for improved coupling efficiency and method using same

A fiber optic probe for detecting scattered light, with transmitting and receiving fibers having slanted ends and bundled together to form a bevel within the tip of the probe. The probe comprises a housing with a transparent window across its tip for protecting the transmitting and receiving fibers held therein. The endfaces of the fibers are slanted, by cutting, polishing and the like, so that they lie in a plane that is not perpendicular to the longitudinal axis of the respective fiber. The fibers are held in the tip of the probe using an epoxy and oriented so that lines normal to the slanted endfaces are divergent with respect to one another. The epoxy, which is positioned substantially between the transmitting and receiving fibers, is tapered so that the transmitting fiber, the epoxy and the receiving fiber form a bevel of not more than 20 degrees. The angled fiber endfaces cause directing of the light cones toward each other, resulting in improved light coupling efficiency. A light absorber, such as carbon black, is contained in the epoxy to reduce crosstalk between the transmitting and receiving fibers.
Inventors:
 [1];  [2]
  1. (Martinez, GA)
  2. (Aiken, SC)
Issue Date:
OSTI Identifier:
869809
Assignee:
United States of America as represented by United States (Washington, DC) SRS
Patent Number(s):
US 5402508
Contract Number:
AC09-89SR18035
Research Org:
WESTINGHOUSE SAVANNAH RIVER CO
Country of Publication:
United States
Language:
English
Subject:
fiber; optic; probe; fibers; endfaces; formed; improved; coupling; efficiency; method; detecting; scattered; light; transmitting; receiving; slanted; bundled; form; bevel; tip; comprises; housing; transparent; window; protecting; held; therein; cutting; polishing; lie; plane; perpendicular; longitudinal; axis; respective; epoxy; oriented; lines; normal; divergent; respect; positioned; substantially; tapered; 20; degrees; angled; directing; cones; resulting; absorber; carbon; black; contained; reduce; crosstalk; receiving fiber; transparent window; improved coupling; receiving fibers; scattered light; fiber optic; longitudinal axis; carbon black; optic probe; probe comprises; transmitting fiber; coupling efficiency; improved light; fibers held; detecting scattered; light absorber; /385/73/250/