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基于熔融拉锥型光子晶体光纤(PCF)的马赫-曾德尔(M-Z)干涉仪是在一段实芯PCF两端分别熔接单模光纤后进行熔融拉锥制作而成的,该传感器透射光谱的干涉条纹对比度可达2.23dB。利用该传感器实现了对不同质量浓度氯化钠溶液传输光谱的检测,研究了其传输光谱与外界折射率的响应关系。实验结果表明,在折射率变化范围为1.333~1.349时,该传感器对于不同质量浓度氯化钠溶液的折射率测量灵敏度为210.075nm/RIU;在温度测量范围为20℃~70℃时,其温度灵敏度约为0.0018nm/℃,在测量中能够克服温度交叉敏感问题。
A Mach-Zehnder (MZ) interferometer based on fused taper photonic crystal fiber (PCF) is fabricated by melting and tapping a single-mode optical fiber at both ends of a solid PCF and then melting and tapering. The interference of transmission spectrum Streak contrast up to 2.23dB. The sensor was used to detect the transmission spectra of sodium chloride solution of different mass concentration, and the response relationship between the transmission spectrum and the refractive index of the outside was studied. The experimental results show that the refractive index of the sensor for different concentrations of sodium chloride solution has a refractive index of 210.075nm / RIU when the refractive index changes from 1.333 to 1.349. When the temperature ranges from 20 ℃ to 70 ℃, the temperature Sensitivity of about 0.0018nm / ℃, in the measurement to overcome temperature cross-sensitive issues.