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报道了一种用空芯光子晶体光纤制作的法布里-珀罗腔体,利用光纤熔接方法将该法布里-珀罗腔体和两根普通通信单模光纤熔接起来构成的微小型光纤法布里-珀罗干涉应变传感器。这种干涉传感器制作过程仅应用了切割和熔接手段,光纤材料单一,因此受温度变化的影响小。另外,该类型传感器的干涉腔长度对干涉信号强度影响不大,其干涉腔长度可至数厘米。因此,这类传感器将在大容量、准分布式传感系统中具有极大的潜在应用价值。
A Fabry-Perot cavity made of hollow-core photonic crystal fiber is reported. The Fabry-Perot cavity and two ordinary communication single-mode fibers are fusion-spliced by a fiber-optic fusion method to form a micro-fiber Fabry-Perot interference strain sensor. This interferometric sensor production process uses only cutting and welding means, a single fiber material, so little affected by temperature changes. In addition, the interference cavity length of this type of sensor has little influence on the interference signal strength, and the length of the interference cavity can be up to several centimeters. Therefore, such sensors will have great potential applications in high-capacity, quasi-distributed sensing systems.