Fiber optic refractive index sensor using a metal clad
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United States of America Patent
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May 29, 1990
Grant Date -
N/A
app pub date -
Jan 29, 1988
filing date -
Jan 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A refractive index FOCS has a thin metal film clad on a fiber optic core so that transmission through the core is strongly affected by the refractive index of a surrounding solvent. The clad is made of platinum, or also of gold, rhodium or palladium. With a fluorescent tip, the changes in the fluorescent signal are a measure of the solvent refractive index. With a reflective tip, 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 solvent refractive index.
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