Abstract
Novel techniques for fabricating a porous sol-gel fiber, doping chemical reagent into the fiber, and constructing an optical fiber chemical sensor using the porous fiber as a transducer, have been invented. A moisture sensor employing a CoCl/sub 2/ doped porous sol-gel fiber as a transducer has been constructed as an example. The test result of the moisture sensor verified a conclusion from theoretical analysis. That is an optical fiber chemical sensor using an active fiber core as a transducer should have a much higher sensitivity than that of active coating based sensor.
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