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采用手动熔接实芯光子晶体光纤和普通单模光纤制作本征法布里-珀罗(Fabry-Pérot,F-P)干涉传感器的方法,提出了一种可实现温度自补偿的高灵敏度折射率计。理论与实验表明,新型F-P干涉传感器的对比度不受环境温度影响只随着外界折射率的变化而变化,当外界折射率在1.32～1.44范围内变化时,其折射率灵敏度约为4.59/RIU,分辨率约为2×10-5。此外,该传感器的腔长具有较高的温度灵敏度,在20～100℃范围内,其温度灵敏度为18.72 nm/℃。因此,可以通过同时监测该传感器对比度和腔长的变化就可以实现折射率和温度的同时测量,在实际工业应用中具有广泛的应用前景。
An intrinsic Fabry-Perot (F-P) interference sensor was fabricated by manually splitting solid-core photonic crystal fibers with ordinary single-mode optical fibers. A high-sensitivity refractometer for temperature self-compensation was proposed. Theoretical and experimental results show that the contrast of the new FP interferometer is not influenced by ambient temperature only with the change of external refractive index. When the external refractive index changes from 1.32 to 1.44, the refractive index sensitivity is about 4.59 / RIU, The resolution is about 2 × 10-5. In addition, the sensor cavity length has a higher temperature sensitivity, in the range of 20 ~ 100 ℃, the temperature sensitivity of 18.72 nm / ℃. Therefore, the simultaneous measurement of the refractive index and the temperature can be achieved by simultaneously monitoring the contrast of the sensor and the change of the cavity length, and has wide application prospect in practical industrial applications.