This book provides a detailed study about latest developments of fiber optic sensors. The book provides essential propositions of varied sensor types, their role in structural health monitoring and evolution of varied physical, chemical and biological criteria. By presenting various advanced styles of sensing and systems, and by depicting latest evolvements in fiber Bragg grating, reflectometry and interfometry based sensors; the book highlights the improvement and growth of fiber optics sensors by arc discharges, fiber optic displacement sensors and their applications. This book successfully unites academicians and practitioners in an overall observation of the subject. This book provides the required information to scientists working and teaching, 'optical fiber sensor technology' and it can also be used by industrialists who need to update themselves with modern and recent progresses in the field.