Demonstration of High-Resolution DFB Fiber Laser Acoustic Emission Sensing System for CFRP Laminates

Zhang, Jianxiang; Huang, Wenzhu; Zhang, Wentao; Li, Fang; Du, Yanliang

doi:10.1109/jsen.2021.3088973

Cited by 6 publications

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The frequency noise of the narrow half−open−cavity RFL is measured by using a 3 × 3 unbalanced fiber Michelson interferometer and a digital phase demodulation scheme [ 42 ], as shown in Figure 9 . The output light enters the unbalanced fiber Michelson interferometer (MI) via a 3 × 3 OC and a CIR, where a section of conventional forty−five−meter−long SMF is inserted into one arm as a delay fiber.…”

Section: Resultsmentioning

confidence: 99%

Narrow Linewidth Half-Open-Cavity Random Laser Assisted by a Three-Grating Ring Resonator for Strain Detection

Zhang

Huang

et al. 2022

Sensors

View full text Add to dashboard Cite

A stabilized narrow-linewidth random fiber laser for strain detection, based on a three-grating ring (TGR) resonator and half-open-cavity structure, is proposed and investigated experimentally. The half-open-cavity structure proved to provide double optical gain of erbium-doped fiber, which was beneficial to increase the photon lifetime as well as further narrow the linewidth. Meanwhile, the stability and frequency noise of narrow lasing output was improved by suppressing the competition-induced undesired residual random lasing modes with the TGR resonator. The TGR resonator is composed of a double-cavity fiber Bragg grating Fabry–Perot (FBG-FP) interferometer, a section of single-mode fiber, and a circulator. The specially designed double-cavity FBG-FP interferometer embedded in the TGR resonator acted as the strain-sensing element and improved the resolution of the dynamic strain. A stable ultra-narrow linewidth of about 205 Hz was obtained. The frequency noise was reduced to about 2 Hz/√Hz. A high dynamic strain measuring resolution of 35 femto-strain (fε)/√Hz was achieved.

show abstract

Section: Resultsmentioning

confidence: 99%