Temperature and Strain Independent Torsion Sensor using a Sagnac Interferometer based on a Suspended Twin-core Fibre

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Silva, RM (Author) Other; Kobelke, J (Author) Other; Schuster, K (Author) Other; Frazao, O (Author) FCUP

Conference proceedings International

Title: FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Fourth European Workshop on Optical Fibre Sensors

Porto, PORTUGAL, SEP 08-10, 2010

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Other information

Authenticus ID: P-003-AZY

DOI: 10.1117/12.864805

Abstract (EN): In this work, it is presented a Sagnac interferometric configuration based on a suspended twin-core fibre for sensing applications. Using the suspended twin-core fibre, the fringe pattern is due to the differential optical path of the light in the two cores associated with a refractive index difference of similar to 10(-3), which indicates an advantage of this approach compared with those based on Hi-Bi fibres, namely the possibility to use a small length of suspended twin-core fibre. The sensing configuration was characterized for torsion, temperature and strain. Using the Fast Fourier Transform technique it is possible to obtain the measurand induced amplitude variations of the fringe pattern. The results obtained indicate the viability of a temperature and strain independent torsion sensor.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4