Waterproof optical fiber chemical sensor and method of making same
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United States of America Patent
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Apr 28, 1992
Grant Date -
N/A
app pub date -
Mar 28, 1990
filing date -
Mar 28, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fiber optic chemical sensor is made water repellent by attaching a plurality of long, hydrophobic chains, e.g. silane polymers, to the surface. The chains extend from the surface and form a semi-permeable barrier which repels water molecules while selectively passing analyte molecules therethrough. In one configuration, the hydrophobic chains are attached substantially uniformly over the clad. In a second configuration, the clad is a plurality of spaced stripes with the hydrophobic chains attached in the gaps between the stripes. In another configuration, a patterned hydrophobic coating of alternating thick and thin segments is formed on the clad.
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