Abstract We propose a dual-parameter active fiber sensor (DP-AFS) based on a fiber ring laser, which uses a single-mode-two-mode-single-mode fiber interferometer (STS-FI) and a two-mode Fiber Bragg Grating (TMFBG) as the intracavity DP sensing element. The effects of different lateral-offset splicing parameters on the interferometric spectra of the STS-FI are investigated. The excitation ratio of the LP11 mode in the STS-FI is the highest when the lateral-offset distance is 6 μ m , which achieves the best sensing performance. By measuring the output wavelength and intensity of the fiber laser, DP sensing of strain and stress with high linearity is achieved simultaneously. The sensor has a strain sensitivity of − 0 . 0167 dB/ μ e and a stress sensitivity of 7 . 67 × 1 0 − 3 nm/N. The proposed DP-AFS can be applied for reliable and precise measurements of strain and stress simultaneously.

中文翻译：

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基于多模光纤模态干涉双参数检测的有源光纤传感器

摘要 我们提出了一种基于光纤环形激光器的双参数有源光纤传感器 (DP-AFS)，它使用单模双模单模光纤干涉仪 (STS-FI) 和双模光纤布拉格干涉仪。光栅 (TMFBG) 作为腔内 DP 传感元件。研究了不同横向偏移拼接参数对 STS-FI 干涉光谱的影响。STS-FI中LP11模式的激励比在横向偏移距离为6μm时最高，实现了最佳传感性能。通过测量光纤激光器的输出波长和强度，同时实现高线性的应变和应力DP传感。传感器的应变灵敏度为 - 0 。0167 dB/ μ e 和 7 的应力敏感度。67 × 1 0 − 3 nm/N。