Journal Article10.1364/AO.45.004567
Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating
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TL;DR: A long-period fiber grating (LPFG) humidity sensor is reported utilizing poly(ethylene oxide)/cobalt chloride (PEO/CoCl2) as a hybrid hygrosensitive cladding coating.
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Abstract: A long-period fiber grating (LPFG) humidity sensor is reported utilizing poly(ethylene oxide)/cobalt chloride (PEO/CoCl2) as a hybrid hygrosensitive cladding coating. A thin overlay of the material is deposited on the LPFG and with exposure to different ambient humidity levels, its spectral properties are modified. The material parameters associated with the sensing mechanism may include those of refractive index, absorption, and morphological alterations of the overlaid material. Relative humidity variations in the range from 50% to 95% have been detected with a resolution better than 0.2%. The response time constant of the fiber sensor is of the order of a few hundred milliseconds.
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Citations
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References
Long-period fiber gratings as band-rejection filters
Ashish Madhukar Vengsarkar,Paul Joseph Lemaire,J. B. Judkins,Vikram Bhatia,Turan Erdogan,John E. Sipe +5 more
TL;DR: In this paper, a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters is presented.
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Optical fibre long-period grating sensors: characteristics and application
Stephen W. James,Ralph P. Tatam +1 more
TL;DR: In this paper, the authors reviewed recent research on fiber optic long-period gratings (LPGs) with emphasis placed upon the characteristics of LPGs that make them attractive for applications in sensing strain, temperature, bend radius and external index of refraction.
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Optical fiber humidity sensor based on a tapered fiber coated with agarose gel
TL;DR: An optical fiber humidity sensor (OFHS) was fabricated using a hydrophilic gel (agarose) deposited on the thinner zone of a biconically tapered single-mode optical fiber as discussed by the authors.
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Long period gratings as solution concentration sensors
TL;DR: In this article, an optical fiber long-period grating (LPG) was used for the refractometry of sodium chloride, calcium chloride and ethylene glycol aqueous solutions.
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Optical sensor for the determination of moisture
A.P. Russell,K.S. Fletcher +1 more
TL;DR: The spectrum of cobalt chloride on the fiber is similar to a transmission spectrum rather than an attenuated totla reflection (a.t.r.) spectrum because of the refractive index of the film which is slightly greater than that of the fiber.
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