Abstract The theoretical description and experimental demonstration for pressure sensing characterized over the spectrum shift of FBG and exponential property are reported, which are investigated through the system of an optical fiber loop ring-down cavity (FLRDC) inserted a fiber Bragg grating (FBG). The mathematical models and simulations of FLRDC-FBG are established to investigate the exponential equation between pulses’ peak intensities and time delays with different pressure perturbations, which agrees well with experimental results. Meanwhile, the experimental performances of pressure applied to the FBG are analyzed by measuring the central wavelength and ring-down time from FLRDC-FBG. The pressure sensing with FLRDC-FBG shows the perfect repeatability, stability and high sensitivity. The measurement sensitivity of the proposed FLRDC-FBG achieves 0.00981/( μ s ⋅ kPa) by discussing the relationship between ring-down time and pressure. The relationship between pressure and central wavelength indicates the sensitivity of 0.65 pm/kPa. The experimental results not only exhibit the good performances to the proposed pressure sensing of FLRDC-FBG but also demonstrate its usefulness for pressure measurement.

中文翻译：

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光纤布拉格光栅环路衰荡腔压力传感性能研究

摘要 报道了通过光纤环路衰荡腔（FLRDC）插入光纤布拉格光栅（FBG）的系统研究了以FBG谱移和指数特性为特征的压力传感的理论描述和实验证明。建立了FLRDC-FBG的数学模型和仿真，研究了不同压力扰动下脉冲峰值强度与时延之间的指数方程，与实验结果吻合较好。同时，通过测量FLRDC-FBG的中心波长和衰荡时间，分析了施加在FBG上的压力的实验性能。使用 FLRDC-FBG 的压力传感显示出完美的可重复性、稳定性和高灵敏度。通过讨论衰荡时间和压力之间的关系，所提出的 FLRDC-FBG 的测量灵敏度达到 0.00981/( μ s ⋅ kPa)。压力与中心波长的关系表明灵敏度为 0.65 pm/kPa。实验结果不仅展示了 FLRDC-FBG 所提出的压力传感的良好性能，而且证明了其在压力测量中的有用性。