This paper discusses a novel detection scheme to measure strain and temperature simultaneously using a section of specially designed few mode fibre (FMF). The work shows that the propagation constant difference between LP_(01) and LP_(02) modes, Δβ, has a maximum at the critical wavelength (CWL) in the transmission spectrum. Theoretical analysis and experimental verification indicate that the peaks located on each side of the CWL shift to opposite directions under strain and temperature variations. The two peaks located closest to the CWL from both sides, Left Peak 1 and Right Peak 1, shift linearly with indeed different and high strain and temperature sensitivities, when an appropriate length of FMF is chosen, allowing such a device to be used to simultaneously measure strain and temperature over a known range.
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机译：本文讨论了一种新的检测方案，用于使用专门设计的少量模式光纤（FMF）的截面同时测量应变和温度。该工作表明，LP_（01）和LP_（02）模式，Δβ之间的传播恒定差异在传输频谱中具有最大临界波长（CWL）。理论分析和实验验证表明，位于CWL的每一侧的峰值在应变和温度变化的各方面转变为相反的方向。 The two peaks located closest to the CWL from both sides, Left Peak 1 and Right Peak 1, shift linearly with indeed different and high strain and temperature sensitivities, when an appropriate length of FMF is chosen, allowing such a device to be used to simultaneously在已知范围内测量应变和温度。
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