In-fiber grating sensors

Abstract

The period of in-fiber grating can be changed due to the change of pressure or temperature that the in-fiber grating bears. The reflecting wavelength of in-fiber grating will shift as its period changes. This characteristic trait of in-fiber grating can render it to be used as a sensor element to detect pressure or temperature. The key issue is how to interrogate the reflecting wavelength shift accurately. The techniques of in-fiber grating sensors are reviewed with an emphasis on interrogation approaches to reflecting wavelength shift induced by measurement quantities. Some suggestions are also made in this paper. (C) Published by Elsevier Science Ltd. All rights reserved.