Research On Isopropanol-sealed Fabry-pérot Temperature And Strain Sensors With High Sensityvity

With the years product revolutions of the optoelectronics industry and the fiber optic communication have taken place.The inherent performance of fiber optic sensor comparable to conventional electrical sensors which include ability of high sensitivity,very small size,low power,resistant to electromagnetic interference.To date,some fiber optic sensors are used for real time deformation monitoring of aircrafts,ships,bridges,and constructions.In this paper,a highly sensitive optical fiber isopropanol cavity Fabry-Pérot interferometer based on temperature and strain sensing characteristic research are proposed.Firstly,it makes a simple introduction about the types,applications and the fabrication methods of fiber-optic interferometers.It focuses on the domestic and foreign research status and the application prospects of optical fiber Fabry-Pérot interferometers for temperature and strain.Secondly,the basic theory of the optical fiber Fabry-Pérot interferometer is introduced.The principles of beam interference,the temperature and strain sensing principle are introduced in detail,and the theoretical model of the Fabry-Pérot cavity interferometer is established.The beam transmission,energy distribution,and the effect on the output intensity of different cavity lengths of the air cavity Fabry-Pérot and isopropanol cavity Fabry-Pérot interferometers are simulated by the beam propagation method(BPM).Then,the method of the interferometer sensor for the air cavity Fabry-Pérot are introduced.The temperature and strain measurement system and experimental method are introduced.The temperature and strain sensor characteristics are analyzed.The influence parameters of sensitivity were verified experimentally and compared with the theory.Finally,a novel sensor based on isopropanol cavity Fabry-Pérot interference principle is designed and fabricated.With temperature and strain changed,the interference spectrum will move,and the temperature and strain sensing are studied.The characteristics of the parameters affecting the sensitivity of temperature and strain were verified experimentally and compared with the theory.Finally,the error analysis of the experimental results and the corresponding solutions are proposed.