This text has been written to fit within a series designed to be an essential reference work on all aspects of optical fibre sensors and the associated technology. "Optical Fiber Sensor Technology: Fundamentals" deals with the fundamentals of the subject in terms of the essential physics and mathematical background required for a fuller understanding of optical fibre systems. It draws upon a group of authors from industry and academia with an international reputation for their work in the field. The work provides the essential first step in an appreciation of the series, covering as it does the essential principles of optical fibre devices. The chapters are of a fundamental nature, yet topical in their use of material. Illustrated and referenced, they point to hundreds of key references accessible in the open literature to interested readers. Commercial systems, applications and patent data are included where appropriate in the chapters, with particular reference to the applicability to industry of the techniques described.