The Vernier effect is an effective way of magnifying the sensitivity of the sensor for higher resolution sensing. The Fiber-optic cascaded Fabry-Perot Interferometric (CFPI) temperature sensor has been theoretically studied and experimentally investigated in this paper base on Vernier effect. It has been manufactured by a segment of pure silica hollow-core fiber (HCF) fused between two sections single-mode fibers (SMF), where the optical path length of the HCF is similar to that of the terminal SMF. The combination of a fiber Bragg grating (FBG) and a CFPI structure could be used not only obtain the amount of temperature variation but also know the specific value of the temperature. The temperature sensitivity of the sensor was 706.9 pm/°C, which is 76 times higher than that of single one fiber-optic cavity FP temperature sensor. The sensor has a wide range of potential applications such as high-precision temperature sensing and high-temperature monitoring.

游标效应是放大传感器灵敏度以进行更高分辨率感测的有效方法。本文基于游标效应对光纤级联法布里-珀罗干涉温度（CFPI）温度传感器进行了理论研究和实验研究。它是由一段纯净的二氧化硅空心光纤（HCF）融合在两段单模光纤（SMF）之间制成的，其中HCF的光路长度类似于终端SMF的光路长度。光纤布拉格光栅（FBG）和CFPI结构的结合不仅可以用来获得温度变化量，而且可以知道温度的特定值。传感器的温度灵敏度为706.9 pm /°C，比单个光纤腔FP温度传感器高76倍。