Abstract
Plastic-clad silica (PCS) fibers having a rubbery silicone cladding offer a distinct advantage for chemical sensing applications in that small molecule chemical species will diffuse through the cladding very rapidly. If a dye is incorporated in the silicone which is altered in color by a chemical of interest, the dye will be affected throughout the silicone volume. Further, because the evanescent tail of the light energy propagating in the fiber core extends into the cladding where it interacts with the dye, the absorption loss spectrum of the fiber is altered by the presence of the dye and by any color changes which it undergoes. The fiber thus represents a distributed chemical sensor in that absorption loss changes which occur anywhere along its length may be detected.
© 1988 Optical Society of America
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