Fabry-Perot cavity air pressure probe based on ultraviolet glue and ceramic ferrule
A novel Fabry-Perot interferometer(FPI)pressure probe was prepared using ultraviolet(UV)adhe-sive and ceramic ferrule for high-sensitivity pressure measurement.First,a layer of UV glue is evenly coated on the end face of the optical fiber ceramic ferrule,then a section of flat single-mode fiber(SMF)is inserted into the optical fiber ceramic ferrule,adjusting the distance between the optical fiber end face and the ceramic ferrule end face UV glue film,and an FPI with excellent performance is made.Due to the excellent elastic deformation of UV adhesive,FPI is sensitive to changes in air pressure.The experimental results show that the pressure sensitivity and temperature sensitivity of the sensor are-10.712 nm/MPa and-1.449 nm/℃,respectively.In order to compensate for the impact of temperature changes on sensor pressure measurement,a temperature sensitive and pressure insensitive fiber Bragg grating(FBG)was cascaded with FPI to eliminate the influence of temperature on FPI pressure measurement.This sensor has the advantages of simple structure,convenient preparation,low cost,high sensitivity,good repeatability and stability,and has certain application prospects in industrial production.
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