Research On Sensing Characteristics Of The Hybrid Structure Interferometer Based On Fiber Michelson And Fabry-P(?)rot

With the development of optical fiber sensing technology,the application scope of fiber optic sensors has been greatly expanded.Fiber optic sensors have many advantages,such as flexibility,wide range of measurable objects,anti electromagnetic interference and corrosion,remote monitoring and so on.So it is favored by the staff in the fields of chemical,aerospace,industrial production,engineering maintenance,and environmental monitoring.In this paper,a hybrid sensor structure based on fiber Michelson interferometer and optical fiber Fabry-P(?)rot interferometer is proposed.The structure can be used to measure both temperature and transverse load simultaneously.The main contents of this paper are as follows:Firstly,the basic principle of optical fiber Michelson interferometer and the principle of temperature sensing are analyzed theoretically,and the optical fiber Michelson interferometer based on misplacement fusion is fabricated.The misplacement penetration amount is 5?m,6?m and 7?m.The temperature sensing characteristics of the three interferometer structures are studied experimently,both the relationship of the dislocation quantity and the high order model type are analyzed.The transverse load sensing characteristics of optical fiber Michelson interferometer are explored experimentally.Secondly,the sensing principle of air chamber optical fiber Fabry-P(?)rot interferometer is expounded,and the basic principle of the structure for transverse load sensing is analyzed.The fabrication process of air cavity optical fiber Fabry-P(?)rot interferometer is introduced,and its interference components are analyzed by interferometric spectrum with Fourier transform of.The temperature sensing characteristics of the optical fiber Fabry-P(?)rot interferometers with air cavity lengths of 69?m,83?m,and 108?m were explored through experiments,and the influence of the change of the hollow cavity position on the transverse load sensing are investigated.The temperature sensing characteristics of air cavity optical fiber Fabry-P(?)rot interferometer are explored.Finally,the principle of simultaneous measurement of two parameters is analyzed theoretically.The mixed structure was made.The structural parameters are as follows: the mismatch fusion amount is 6?m,the distance from the air cavity to the dislocation melting point is 5.05 cm,the air chamber is located in the middle of the microsphere,and the air cavity length is 123?m.The transverse load sensitivity of the two tracking points in the range of 0-3.332 N and the temperature sensitivity within the range of 35-60oC are obtained by the sensing experiments of the transverse load and temperature of the hybrid sensing structure.At last,the 2-order conversion matrix is used to measure both the two parameters,and the detection resolution of the in the experimental system is obtained.