Temperature Insensitive Hysteresis Free Highly Sensitive Polymer Optical Fiber Bragg Grating Humidity Sensor

Abstract

The effect of humidity on annealing of poly (methyl methacrylate) (PMMA) based microstructured polymer optical fiber Bragg gratings (mPOFBGs) and the resulting humidity responsivity are investigated. Typically annealing of PMMA POFs is done in an oven without humidity control around 80°C and therefore at low humidity. We demonstrate that annealing at high humidity and high temperature improves the performances of mPOFBGs in terms of stability and sensitivity to humidity. PMMA POFBGs that are not annealed or annealed at low humidity level will have a low and highly temperature dependent sensitivity and a high hysteresis in the humidity response, in particular when operated at high temperature. PMMA mPOFBGs annealed at high humidity show higher and more linear humidity sensitivity with negligible hysteresis. We also report how annealing at high humidity can blue-shift the FBG wavelength more than 230 nm without loss in the grating strength.

Publication Date

1-25-2016

Publication Title

Optics Express

Volume

24

Issue

2

Number of Pages

1206-1213

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.24.001206

Socpus ID

84961751320 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84961751320

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