提出了一种结构紧凑的基于法布里-珀罗干涉仪(FPI)和光纤布拉格光栅(FBG)的双参量光纤 传感器,实现了对应变和温度的同时测量。将一段端面被腐蚀过的多模光纤(MMF)与一小段光敏 光纤(PSF)熔接形成FPI。PSF的平整端面作为FPI的一个反射面, FBG被刻写在PSF中。实验测 得FPI和FBG对应变的灵敏度分别为8.63 pm/με和1.11 pm/με, 对温度的灵敏度分别为-1.60 pm/°C和9.75 pm/°C。 由于FBG和FPI对应变和温度分别有不同的灵敏度,组合起来可以实现对双参量的同时测量。 实验结果表明传感器同时进行应变和温度测量时的最大误差分别为6.72 με和0.98 °C。

A compact dual-parameter fiber sensor based on Fabry-Perot interference(FPI) and fiber Bragg grating (FBG) is proposed, and simultaneous measurement of temperature and strain is realized. A section of end-face-etched multimode fiber (MMF) and a small section of photosensitive fiber (PSF) are fused to form FPI. The flat end face of PSF acts as a reflector of FPI, and FBG is written in PSF. The measured strain sensitivities of FPI and FBG are 8.63 pm/με and 1.11 pm/με, and the temperature sensitivities of them are -1.60 pm/°C and 9.75 pm/°C, respectively. As FBG and FPI have different sensitivities to strain and temperature, they can be utilized together for simultaneous measurement of dual parameters. Experiment results show that the maximal errors are respectively 6.72 με and 0.98 °C for strain and temperature when they are measured simultaneous.