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Dual parameter fiber optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer

Hammarling, Krister; Wahl, Markus Solberg; Muri, Harald Ian; Engholm, Magnus; Hjelme, Dag Roar
Journal article
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URI
http://hdl.handle.net/11250/2495650
Date
2017
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  • Institutt for elektroniske systemer [1553]
  • Publikasjoner fra CRIStin - NTNU [20804]
Original version
10.1109/ICSENS.2017.8234356
Abstract
A new concept for dual parameter fiber optic sensor has been developed and characterized, both in a two-fiber and single-fiber configuration. The liquid sensor measures ethanol concentration with a stimuli responsive hydrogel which constitutes a low finesse Fabry-Perot cavity, and refractive index with a Mach-Zehnder type fiber optic interferometer. The two-fiber configuration utilize a fiber optic 1310/1550 nm wavelength division multiplexer to separate the two parameters, while a versatile filtering algorithm extracts and separates the two parameters in the single-fiber configuration. No cross talk were observed for the measured parameters of free spectral range and refractive index for the two-fiber configurations, while for the single fiber configuration cross-talk were observed. The two configurations prove to be versatile dual parametric fiber optic sensor concepts for accurate detection of specific parameters, based on stimuli responsive hydrogels.
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Journal
Dual parameter fiber optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer

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