Optical Sensors

Performance optimized optical fiber sensor for humidity measurement

[+] Author Affiliations
Sunil K. Khijwania

Mississippi State University, Diagnostic Instrumentation and Analysis Laboratory, 205 Research Boulevard, Starkville, Mississippi 39759 E-mail: skhijwania@dial.msstate.edu

Kirthi L. Srinivasan

Naval Sea Logistics Center Detachment—Portsmouth, 80 Daniel Street, Suite 400, Portsmouth, New Hampshire 03801-3884

Jagdish P. Singh

Mississippi State University, Diagnostic Instrumentation and Analysis Laboratory, 205 Research Boulevard, Starkville, Mississippi 39759

Opt. Eng. 44(3), 034401 (Mar. 10, 2005). doi:10.1117/1.1870753
History: Received May 18, 2004; Revised Aug. 30, 2004; Accepted Sep. 24, 2004; Mar. 10, 2005; Online March 10, 2005
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A comprehensive experimental study of a fiber optic relative humidity (RH) sensor is carried out in terms of characterization and performance optimization against various parameters that affect the sensor response and sensitivity e.g., film composition, film thickness, fiber core diameter, and the sensor geometry. The sensor is based on evanescent wave absorption spectroscopy and utilizes a specific reagent immobilized permeable polymer membrane cladding on a declad U-bend optical fiber. An optimum film thickness and an optimum film composition exist. In addition, a fiber with a smaller core diameter was observed to be more sensitive, unlike the previously reported results. The sensitivity further increases with a decrease in the bending radius. The sensor is found to be sensitive to RH ranging from ∼1.6 to ∼92%, exhibiting a very fast response time, an extremely good degree of reversibility, repeatability, and a large dynamic range. © 2005 Society of Photo-Optical Instrumentation Engineers.

© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Sunil K. Khijwania ; Kirthi L. Srinivasan and Jagdish P. Singh
"Performance optimized optical fiber sensor for humidity measurement", Opt. Eng. 44(3), 034401 (Mar. 10, 2005). ; http://dx.doi.org/10.1117/1.1870753


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