Temperature and strain-independent curvature sensor based on a singlemode/multimode fiber optic structure

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Susana Silva (Author) FCUP; Frazao, O (Author) FCUP; Viegas, J (Author) Other; Ferreira, LA (Author) Other; Araujo, FM (Author) Other; Xavier Malcata, FX (Author) Other; Santos, JL (Author) FCUP

Journal

Title: Measurement Science and Technology

Vol. 22

Final page: 085201

ISSN: 0957-0233

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 61 Citations

Scopus - 60 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-002-PFG

DOI: 10.1088/0957-0233/22/8/085201

Abstract (EN): This work describes a fiber optic sensing structure that is sensitive to curvature, and features a low temperature-and strain cross-sensitivity. It is based on multimode interference, and relies on a singlemode-step index multimode-singlemode fiber structure. It was observed that the transmitted optical power in such a layout is highly sensitive to the wavelength of operation, and to the length of the multimode fiber. The optical spectrum exhibits two dominant loss bands, at wavelengths that have similar responses both to temperature and strain, but different responses to curvature. Based on this result, an interrogation approach is proposed that permits substantial sensitivity to curvature (8.7 +/- 0.1 nm m) and residual sensitivities to temperature and strain (0.3 +/- 0.1 pm degrees C(-1) and (-0.06 +/- 0.01) x 10(-6) m m(-1), respectively). The beam-propagation method was employed for modeling the propagation of light along the optical fiber sensing device proposed.

Language: English

Type (Professor's evaluation): Scientific