Micro-Displacement Sensor Based on a Hollow-Core Photonic Crystal Fiber

Abstract

A sensing head based on a hollow-core photonic crystal fiber for in-reflection measurement of micro-displacements is presented. The sensing structure takes advantage of the multimodal behavior of a short segment of hollow-core photonic crystal fiber in-reflection, being spliced to a single mode fiber at its other end. A modal interferometer is obtained when the sensing head is close to a mirror, through which displacement is measured.

Keywords

• fiber optic sensor
• photonic crystal fiber
• micro-displacement sensor
• modal interferometer