Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating

Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating

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 properti...

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Veröffentlicht in:Applied Optics 2006-07, Vol.45 (19), p.4567-4571
Hauptverfasser: Konstantaki, Maria, Pissadakis, Stavros, Pispas, Stergios, Madamopoulos, Nicholas, Vainos, Nikos A
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container_end_page 4571
container_issue 19
container_start_page 4567
container_title Applied Optics
container_volume 45
creator Konstantaki, Maria
Pissadakis, Stavros
Pispas, Stergios
Madamopoulos, Nicholas
Vainos, Nikos A
description 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.
doi_str_mv 10.1364/AO.45.004567
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title Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating
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