Surface Curvature Sensor Based on Intracavity Sensing of Fiber Ring Laser

The measurement of surface curvature is great significance in aerospace, structural health monitoring, energy batteries, etc. In this paper, a fiber-optic sensor, based on intracavity sensing fiber ring laser (FRL), experimentally demonstrated. A no-core fiber- filter performs as the head FRL sensor. response between NCF and output wavelength was investigated. curvature, sensor system showed narrow 3-dB bandwidth 0.08 nm, with high signal-to-noise ratio about 60 dB. sensitivities were measured ?0.348 nm/m?1 within 0.2 m?1, ?3.185 from m?1 to 0.475 m?1. performance characterized by parameters, including stability, temperature cross-sensitivity, detection limit.