Abstract

An extrinsic optical fibre bending sensor based on intensity modulation technique aimed for physiological application is presented. This sensing technique is capable of measuring the bending angle continuously in flexion, extension and lateral movements. The sensor working range is between −22° and 22° with 0.4° accuracy and 0.1° resolution. From the theoretical estimation, the bending sensor automatically compensates for variation in the source intensity and various losses in the input and output fibres. The experimental results obtained in this investigation verified the theoretical finding. Among the advantages of the this optical bending sensor are being noninvasive, suitable for continuous measurement and immune from electromagnetic effects.

© 2014 IEEE

Two-mode fiber-optic bending sensor with temperature and strain compensation

C. E. Covington, J. Blake, and S. L. A. Carrara
Opt. Lett. 19(9) 676-678 (1994)

Bend loss in structured optical fibres

Cicero Martelli, John Canning, Brant Gibson, and Shane Huntington
Opt. Express 15(26) 17639-17644 (2007)

Fiber-optic bend sensor using LP₂₁ mode operation

Yuqiang Fan, George Wu, Wanting Wei, Yufeng Yuan, Feng Lin, and X. Wu
Opt. Express 20(24) 26127-26134 (2012)

Nonplanar fiber-optic sensing head for the compensation of bending-induced birefringence in Faraday current sensors

César D. Perciante, Sofía Aparicio, Ricardo Illa, and José A. Ferrari
Appl. Opt. 54(18) 5708-5714 (2015)

Intensity measurement bend sensors based on periodically tapered soft glass fibers

Yiping Wang, David Richardson, Gilberto Brambilla, Xian Feng, Marco Petrovich, Ming Ding, and Zhangqi Song
Opt. Lett. 36(4) 558-560 (2011)