Phase-shifted fiber bragg grating based humidity sensor

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Proceedings titleProceedings of SPIE - The International Society for Optical Engineering
ConferencePhotonic Applications for Aerospace, Commercial, and Harsh Environments IV, 29 April 2013 through 1 May 2013, Baltimore, MD
Article number872019
SubjectBragg wavelength; Humidity and temperatures; Humidity levels; Humidity sensing; Intrinsic property; Measurement resolution; Phase shifted fiber bragg grating (PSFBG); Reliable measurement; Electric sensing devices; Fiber optic sensors; Fibers; Humidity sensors; Moisture; Phase shift; Fiber Bragg gratings
AbstractA humidity fiber optic sensor based on phase-shifted (PS) fiber Bragg Gratings (FBG) is demonstrated in this paper. The sensor (PS-FBG) is coated with a moisture sensitive polyimide. When this thin coating is exposed to moisture its swells, hence inducing tensile stress on the PS-FBG and affecting its Bragg wavelength. Due to its intrinsic properties, the PS-FBG sensor presents the same trend of wavelength variation as standard fiber Bragg Grating sensor but with higher measurement resolution, and reliable measurements can be obtained in different humidity and temperature environments. This paper assesses the suitability, including sensitivity and response time, of the phaseshifted FBG sensor approach for humidity sensing. By monitoring this change, it is demonstrated that the humidity level of the environment can be accurately monitored. © 2013 SPIE.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270666
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Record identifierfbc129ce-09fc-408a-b0f6-1ff222a44102
Record created2014-02-17
Record modified2016-05-09
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