Fiber optic refractive index sensor using metal cladding

Details Fiber optic refractive index sensor using metal cladding Fiber optic refractive index sensor using metal cladding

G - Physics

01

N

G01N 21/41 (2006.01) G01N 21/43 (2006.01) G02B 6/02 (2006.01)

Patent

CA 2078784

2078784 9114956 PCTABS00007 A refractive index FOCS has a fiber optic core (12) with a partly light transmissive thin metal film clad (16) of an effective thickness and light transmissivity so that transmission through the core is strongly affected by the refractive index of a surrounding liquid or vapor medium (24). The metal clad (16) and surrounding medium (24) produce a localized refractive index at the core interface which modulates light transmission through the core as a function of the medium refractive index. The clad (16) is made of platinum, or also of gold, rhodium, palladium, nickel, iron, cobalt, ruthenium, iridium, osmium, zinc, copper, silver, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, or hafnium. The clad (16) is also made of oxides of these metals, or metal compounds or alloys. With a fluorescent tip (14), the changes in the fluorescent signal are a measure of the medium refractive index. With a reflective tip (18), the changes in the reflected signal are measured. In a linear configuration, source and detector are placed at opposite ends of the fiber and changes in the transmitted signal are measured as a function of refractive index. Multiple measurements with multiple clads of different specificity can be made. The multiple clads can be on a single fiber or on separate fibers.

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