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Proceedings Paper

Simultaneous measurement of refractive index and temperature based on multimode interference inside a fiber loop mirror
Author(s): C. Gouveia; G. Chesini; J. M. Baptista; C. M. B. Cordeiro; P. A. S. Jorge
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Paper Abstract

A fiber optic sensor for simultaneous measurement of refractive index and temperature is presented. The sensing probe is achieved by introducing multimode interference inside a high birefringence fiber loop mirror resulting in a configuration capable of refractive index and temperature discrimination. The multimode interference peak is sensitive to the surrounding refractive index (90 nm/RIU) and slightly responsive to the temperature (0.005 nm/°C). On the other hand, the birrefringent fiber loop mirror is highly sensitive to temperature (2.39 nm/°C) and has no response to refractive index. Therefore, a temperature independent refractive index measurement can be made with a resolution of ±2.5x10-5.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84216M (7 November 2012); doi: 10.1117/12.975281
Show Author Affiliations
C. Gouveia, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
G. Chesini, Univ. Estadual de Campinas (Brazil)
J. M. Baptista, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
C. M. B. Cordeiro, Univ. Estadual de Campinas (Brazil)
P. A. S. Jorge, INESC Porto (Portugal)


Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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