Lee Cheng-Ling, Chen Chi-Shiang, Yang Chun-Ren, Zeng Rui-Cheng
Department of Electro-Optical Engineering, National United University, No. 2 Lien-Da, Miaoli City 36003, Taiwan.
Polymers (Basel). 2021 Aug 20;13(16):2798. doi: 10.3390/polym13162798.
This study proposes and experimentally demonstrates a NOA61-polymer fiber Fizeau interferometer (PFFI) connected to a flexible NOA65-polymer taper (PT) for simultaneous measurement of tilt angle and temperature (T). The PT/PFFI fiber sensor consists of a taper-shaped flexible NOA65 polymer and single-mode fiber with an endface that is attached to a NOA61-polymer. The NOA61-polymer of PFFI is highly sensitive to variations of T with high repeatability and enables the simultaneous measurement of tilt angle by connecting with the highly flexible NOA65-PT. the interference fringe visibility of optical spectra in the PFFI can be highly controlled by the tilt angle of the PT and is thus capable of measuring tilt angles with high sensitivity. On the other hand, wavelength shifts of the spectra in the PFFI only occur when T varies. The proposed PT/PFFI can simultaneously detect the tilt state and the variation of surrounding T by measuring the optical spectral responses and eliminating cross sensitivity. Experimental results demonstrate the PT/PFFI can simultaneously measure tilt angles and T with good sensitivities and obtain averages of 0.4 dB/° and 0.17 nm/°C, respectively.
本研究提出并通过实验证明了一种连接到柔性NOA65聚合物锥度（PT）的NOA61聚合物光纤斐索干涉仪（PFFI），用于同时测量倾斜角和温度（T）。PT/PFFI光纤传感器由锥形柔性NOA65聚合物和单模光纤组成，其端面连接到NOA61聚合物上。PFFI的NOA61聚合物对T的变化高度敏感，具有高重复性，并且通过与高柔性的NOA65-PT连接能够同时测量倾斜角。PFFI中光谱的干涉条纹可见度可通过PT的倾斜角高度控制，因此能够以高灵敏度测量倾斜角。另一方面，PFFI中光谱的波长偏移仅在T变化时发生。所提出的PT/PFFI通过测量光谱响应并消除交叉灵敏度，能够同时检测倾斜状态和周围T的变化。实验结果表明，PT/PFFI能够以良好的灵敏度同时测量倾斜角和T，平均灵敏度分别为0.4 dB/°和0.17 nm/°C。
