Premium
Humidity fiber sensors based on superstructure fiber Bragg gratings coated with porous sol gel
Author(s) -
Ai Lung,
Liu WenFung,
Fu MingYue,
Chen TzuChiang
Publication year - 2009
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23973
Subject(s) - fiber bragg grating , materials science , superstructure , long period fiber grating , fiber , phosfos , fiber optic sensor , optics , relative humidity , wavelength , optoelectronics , graded index fiber , composite material , physics , thermodynamics , oceanography , geology
A fiber sensor based on an etched superstructure fiber Bragg grating coated with the thin film of sol–gel is used for measuring the relative humidity. The operation mechanism of this sensor is based on that sol–gel materials can react with H 2 O molecules to result in its reflective index change and then to cause both Bragg wavelength shift. The diameter of the superstructure fiber Bragg grating is etched down to 20 μm for obtaining the sensitivity of 0.014 nm/1%RH. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 40–42, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23973