Temperature independent torsion sensor based on modal interferometry in ultra high-birefringent photonic crystal fiber

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

Frazao, O (Author) Other; Jesus, C (Author) Other; Baptista, JM (Author) Other; Santos, JL (Author) FCUP; Roy, P (Author) Other

Conference proceedings International

Title: Proceedings of SPIE - The International Society for Optical Engineering

20th International Conference on Optical Fibre Sensors

Edinburgh, 5 October 2009 through 9 October 2009

Indexing

ISI Web of Knowledge

Scopus - 0 Citations

Other information

Authenticus ID: P-007-RE7

DOI: 10.1117/12.834745

Abstract (EN): A fiber-optic sensor for torsion measurement, based on a two-LP-mode operation in ultra high birefringent photonic crystal fiber (PCF) is described. The structure of the photonic crystal fiber presents two large asymmetric holes adjacent to the core fiber. When linearly polarized light is injected in x or in y directions, respectively, two different interferometers can be obtained. In one of these cases, as torsion is applied to the ultra Hi-Bi PCF a beat between the two interferometers is formed due to the simultaneous excitation of the two polarization states. The detection technique to read the torsion sensor is based on the analysis of the Fast Fourier Transform (FFT), which is an alternative and simple solution. The sensor exhibited reduced sensitivity to temperature and also to strain. © 2009 SPIE.

Language: English

Type (Professor's evaluation): Scientific