提出了一种基于增强型游标效应增敏的高灵敏度光纤温度传感器，该传感器由对温度均敏感的法布里-珀罗干涉计（Fabry-Perot Interferometer，FPI）与萨格奈克干涉计（Sagnac Interferometer，SI）级联构成。FPI为聚二甲基硅氧烷（PDMS）填充空芯光纤（HCF）形成的PDMS腔，SI由单模光纤环内熔接一段熊猫光纤而成。FPI和SI具有相反的温度响应，随温度的升高，FPI的干涉谱逐渐红移，而SI的干涉谱逐渐蓝移，从而产生增强型游标效应，其温度灵敏度远大于单个FPI或单个SI，且放大倍率明显高于普通游标效应。实验结果表明：36~39 ℃温度范围内，该传感器温度灵敏度达到了-57.85 nm/℃，分别为单个FPI和SI灵敏度的44.8倍和30.8倍，分别为普通游标效应放大倍率的2.56倍和1.66倍。该传感器具有灵敏度高、稳定性能好、制备成本低等优点，具有非常好的应用前景。

A high-sensitivity fiber temperature sensor based on enhanced Vernier effect is proposed. The proposed sensor consists of a cascaded Fabry-Perot interferometer （FPI） and Sagnac interferometer （SI）. The FPI was a PDMS cavity formed by filling polydimethylsiloxane （PDMS） into hollow-core fiber （HCF）， and SI was formed by fusing a section of Panda fiber inside a single-mode fiber ring. FPI and SI have opposite temperature responses. With increasing temperature， the interference spectrum of FPI will red-shift， whereas that of SI will blue-shift. Therefore， when FPI and SI are cascaded， an enhanced Vernier effect will be generated， with a temperature sensitivity much greater than FPI or SI alone. The magnification of the enhanced Vernier effect is significantly larger than that of the ordinary Vernier effect. Experimental results show that the sensitivity of the sensor is -57.85 nm/℃ in the temperature range of 36–39℃， which is 44.8 and 30.8 times that of FPI and SI alone， respectively. The sensitivity magnifications are 2.56 and 1.66 times those of ordinary Vernier effect， respectively. The sensor has the advantages of high sensitivity， good stability， low preparation cost， and very good application prospects.