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

R.M. Silva (Author) FCUP; J. Kobelke (Author) FCUP; K. Schuster (Author) FCUP; O. Frazao (Author) FCUP

Conference proceedings International

Title: FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Fourth European Workshop on Optical Fibre Sensors

Porto, Portugal, 8 a 10 de Setembro de 2010

Indexing

ISI Web of Science

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

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