Design and calibration of a fibre Bragg grating-type linear displacement sensor

In this paper the design and testing of a novel displacement sensor, based on optical in-fibre Bragg Grating sensing (FBGs), is described. The principle of operation is based on the conversion of the relative displacement into optical fibre strains by means of an elastic spring: its design allows to measure linear displacements with high accuracy and extended linear range. Owing to the key features of fibre optic sensors, as high sensitivity and immunity to electro-magnetic noise, this packaged sensor has been devoted for monitoring Pixel Vertex Detectors linear displacements of BTeV, an High Energy Physics experiment to be run at the Fermilab Tevatron.