James, Stephen W.Partridge, MatthewTatam, Ralph P.Manders, Mark2017-04-192017-04-192016-03http://dspace.lib.cranfield.ac.uk/handle/1826/11779Strain sensing is important in numerous fields such as: structural health monitoring [1], manufacture of composites [2], and civil engineering [3]. For many of these fields fibre optic based sensors have been utilised due to their numerous advantages, that will be described in Chapter 2. In this thesis I will described the production of three new fibre optic based strain sensors: a microcavity based in-fibre Fabry-Perot etalon (Chapter 4), a birefringent photonic crystal fibre (PM-PCF) based Michleson-interferometer (Chapter 5), and a polarisation maintaining fibre (PMF) based Michleson-interferometer (Chapter 6). In this chapter we will describe the aim of this work, the novelty of this work, and how this work is presented in this thesis.en© Cranfield University, 2016. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.Thesis or dissertation