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Proceedings Paper

Intrinsic fiber optic sensor for distributed water detection
Author(s): Robert A. Lieberman; Edgar A. Mendoza; Douglas J. Ferrell; Edward M. Schmidlin; Steven J. Syracuse; Albert N. Khalil; Ara Dergevorkian; Zongjian Sun; Michael F. Gunther
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Paper Abstract

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.

Paper Details

Date Published: 10 March 1994
PDF: 10 pages
Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); doi: 10.1117/12.170665
Show Author Affiliations
Robert A. Lieberman, Physical Optics Corp. (United States)
Edgar A. Mendoza, Physical Optics Corp. (United States)
Douglas J. Ferrell, Physical Optics Corp. (United States)
Edward M. Schmidlin, Physical Optics Corp. (United States)
Steven J. Syracuse, Physical Optics Corp. (United States)
Albert N. Khalil, Physical Optics Corp. (United States)
Ara Dergevorkian, Physical Optics Corp. (United States)
Zongjian Sun, Physical Optics Corp. (United States)
Michael F. Gunther, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 2068:
Chemical, Biochemical, and Environmental Fiber Sensors V
Robert A. Lieberman, Editor(s)

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