Fiber-optic sensor device and method

Details Fiber-optic sensor device and method Fiber-optic sensor device and method

1997-12-16

1999-11-30

Ngo, Hung N.

Optical waveguides

Optical waveguide sensor

385128, G02B 610

Patent

active

059956860

ABSTRACT:
A sensor system includes an optical fiber sensor element which is connected to a light source at one end and a detector at the opposite end. The sensor element is an optical fiber which has a light transmitting core, a cladding layer surrounding the core, and an outer protective layer. The outer protective layer is removed along at least part of the length of the fiber to expose a portion of the cladding layer, and the exposed portion of the cladding layer is roughened to produce a plurality of surface scratches extending through at least part of the thickness of the cladding layer. The exposed, roughened portion of the cladding layer forms a sensor region through which light is lost from the core, and is exposed to a medium to be monitored so that the amount of light lost will be dependent on the refractive index of the medium.

REFERENCES:
patent: 4575181 (1986-03-01), Ishikawa
patent: 4851817 (1989-07-01), Brossia et al.
patent: 4994682 (1991-02-01), Woodside
patent: 5005005 (1991-04-01), Brossia et al.
patent: 5695583 (1997-12-01), Van Den Bergh et al.

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