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提出了一种基于微结构法布里-珀罗干涉仪(MS-FPI)的光纤光栅(FBG)脉搏波解调方法。所提出的微结构FPI由单模光纤和光子晶体光纤熔接而成,通过特殊的工艺在熔接端面形成微气泡构成FP腔,其尺寸约为48μm。该FPI再涂覆后具有较好的机械强度,可作为纱线织入织物。其干涉谱在弯曲直径4cm范围内,基本保持不变,且具有极低的温度灵敏度,适合作为解调滤波器。对该波长解调方法进行了理论分析和实验研究。结果表明所设计的解调系统在FBG脉搏波范围内可实现线性解调,具有较好的重复性,解调灵敏度约为43m V/pm;所解调出的脉搏波与商用解调仪相一致,通过与光电容积脉搏波的对比,证明了解调脉搏波的正确性。该方法对FBG传感织物的实际应用具有重要意义。
A fiber grating (FBG) pulse wave demodulation method based on microstructure Fabry-Perot interferometer (MS-FPI) is proposed. The proposed microstructured FPI is fabricated by fusion bonding of single-mode fiber and photonic crystal fiber, and the FP cavity is formed by micro-bubbles formed on the welded end by a special process with a size of about 48 μm. The FPI has better mechanical strength after being recoated and can be woven into the fabric as a yarn. The interference spectrum in the bending diameter of 4cm range, the basic remain unchanged, and has very low temperature sensitivity, suitable as a demodulation filter. The wavelength demodulation method is analyzed theoretically and experimentally. The results show that the designed demodulation system can achieve linear demodulation within the range of FBG pulse wave with good repeatability and the demodulation sensitivity is about 43mV / pm. The demodulated pulse wave is similar to the commercial demodulator phase Consistently, the correctness of the demodulated pulse wave was proved by comparing with the photoplethysmography. This method is of great significance for the practical application of FBG sensing fabric.