Surface Curvature Sensor Based on Intracavity Sensing of Fiber Ring Laser
Liang Yi,
Zhifei Xue,
Yiyun Ding,
Min Wang,
Zekang Guo,
Jia Shi
Affiliations
Liang Yi
Department of Instrumentation, Aero Engine Corporation of China Commercial Aircraft Engine Co., Ltd., Shanghai 201306, China
Zhifei Xue
Department of Instrumentation, Aero Engine Corporation of China Commercial Aircraft Engine Co., Ltd., Shanghai 201306, China
Yiyun Ding
Tianjin Key Laboratory of Optoelectronic Detection Technology and System, School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China
Min Wang
Tianjin Key Laboratory of Optoelectronic Detection Technology and System, School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China
Zekang Guo
Tianjin Key Laboratory of Optoelectronic Detection Technology and System, School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China
Jia Shi
Tianjin Key Laboratory of Optoelectronic Detection Technology and System, School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China
The measurement of surface curvature is of great significance in aerospace, structural health monitoring, energy batteries, etc. In this paper, a fiber-optic surface curvature sensor, based on intracavity sensing of fiber ring laser (FRL), is experimentally demonstrated. A no-core fiber- based filter performs as the sensing head of the FRL sensor. The response between the curvature of the NCF and the output wavelength of the FRL was investigated. In the measurement of curvature, the sensor system showed a narrow 3-dB bandwidth of 0.08 nm, with a high signal-to-noise ratio of about 60 dB. The curvature sensitivities were measured as −0.348 nm/m−1 within 0.2 m−1, and −3.185 nm/m−1 from 0.2 m−1 to 0.475 m−1. The performance of the surface curvature sensor was characterized by parameters, including output stability, temperature cross-sensitivity, and detection limit.
