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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MS-FPI由单模光纤和光子晶体光纤(PCF)熔接而成,通过特殊的工艺在熔接端面形成微气泡构成布里-珀罗(F-P)腔,其尺寸约为48μm。该MS-FPI经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,具有较好的测量重复性,解调灵敏度约为43mV/pm;所解调出的脉搏波与商用解调仪的结果一致,通过与光电容积脉搏波的对比,证明了所设计系统解调脉搏波的正确性。
A fiber grating (FBG) pulse wave demodulation method based on microstructure Fabry-Perot interferometer (MS-FPI) is proposed. The proposed MS-FPI is a fusion of single-mode fiber and PCF. Microfluidic microbubbles are formed on the fusion spliced surface to form the Fabry-Perot (F-P) cavity with a size of about 48 μm. The MS-FPI after recoating has better mechanical strength, 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 theoretical analysis and experimental research on this wavelength demodulation method show that the designed demodulation system can realize linear demodulation within the range of FBG pulse wave and has good repeatability of measurement with demodulation sensitivity of about 43mV / pm ; The demodulated pulse wave is consistent with the result of commercial demodulator. The comparison with the photoplethysmography shows that the designed system demodulates the pulse wave correctly.