This paper studies torsion of air-hole microstructured fibers induced by fiber packaging. The twist of
two-hole optical fiber induced while the fibers were coiled into a helix along the surface of a cylinder was
experimentally observed and simulated using the Finite Element Analysis. Both experiment and simulation reveal
periodic twisting patterns when two holes fibers were coiled along the surface of a cylinder.
Tapers suitable for a range of sensing applications have been produced using a heat and pull method. The standard heat
and pull method is much faster than chemical tapering and also allows multiple tapers to be formed on to a single fibre
for distributed sensing. A refinement of the heat and pull method is able to produce tapers extremely quickly, opening
up the possibility of cheap, mass produced sensing tapers in polymer optical fibres. A single and multiple liquid level
sensor is demonstrated.
The ongoing development of a fibre optic voltage sensor requires a self-aligning fibre. We experimentally demonstrate
fibre designs with preferential bending directions which self-align when coiled as part of a voltage sensor device. Such a
fibre has much wider applications.
All fibre voltage sensing using helically coiled lengths of thermally poled twin-hole silica optical fibre is presented. The
thermally poled optical fibre possesses a small electro-optic response and forms the basis of an intrinsic sensor for
electric fields. The helical arrangement of the poled silica fibre, from the ground to the high voltage conductor, allows an
approximation to a tangential line integral of the electric field i.e. the voltage, to be calculated. The interferometric
interrogation system combined with the high speed digital signal processing system allowed voltage measurements at an
effective sampling rate of approximately 5000 samples per second. Preliminary lab system test results are presented.