Sharif Digital Repository

In this study, we have theoretically investigated designing possibility of a seismometer using Fiber Bragg Grating (FBG) and Metal Bellows pairs attached on a mechanical system. This new seismometer can record earthquakes according to sensitivity of fiber optic to changes in physical parameters such as stress and strain. Firstly, in order to understand the quantity and quality of sensor performance, with a mathematically brief description, the effect of stress and strain on the FBG reflection spectrum is examined. FBG is an intrinsic sensing element which can be photoinscribed into a silica fiber. The basic principle of this operation commonly uses FBG based sensor system. The operation is...