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10 March 1994 Intrinsic fiber optic sensor for distributed water detection
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Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994)
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States
A distributed fiber optic moisture sensor based on intrinsic changes in the optical properties of the cladding is reported. A 10-meter-long fiber sensor was fabricated that demonstrated a response to humidity in less than 5 minutes. The humidity-sensitive cladding was fabricated on-line during fiber draw by continuously coating a multimode glass core fiber with a polyvinyl acetate cladding, in which a water-sensitive indicator had been dissolved. The indicator was a solvatochromic dye that showed a pronounced hypsochromic shift in its absorption spectrum in the presence of water. The moisture response of the sensor was monitored by measuring changes in the optical attenuation of the fiber in the region between 580 nm and 650 nm. This spectral region facilitates the use of commercially available solid state optoelectronic devices such as LEDs, laser diodes, and PIN photodiode detectors, in order to produce a low-cost, compact, lightweight humidity sensor.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert A. Lieberman, Edgar A. Mendoza, Douglas J. Ferrell, Edward M. Schmidlin, Steven J. Syracuse, Albert N. Khalil, Ara Dergevorkian, Zongjian Sun, and Michael F. Gunther "Intrinsic fiber optic sensor for distributed water detection", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994);


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