A fiber optic temperature sensor based on a helical cylindrical line for high-sensitivity temperature measurement is designed.The sensor is constructed by spirally winding a single-mode optical fiber at a pitch of 9 m...A fiber optic temperature sensor based on a helical cylindrical line for high-sensitivity temperature measurement is designed.The sensor is constructed by spirally winding a single-mode optical fiber at a pitch of 9 mm to 10 mm for 2 cm to 3 cm around an Acrylonitrile Butadiene Styrene plastic(ABS)plastic rod as the axis.By means of helical bending,the fundamental mode leaks into the cladding to excite the cladding mode,thereby forming mode interference between the cladding mode and the fundamental mode for temperature information sensing.Through the optimization of the existing fiber bending simulation model,a theoretical model for the internal light field distribution of the fiber after helical bending is calculated,which visually demonstrates the distribution of the cladding mode and the fundamental mode,confirming the feasibility of the interference between the cladding mode and the fundamental mode.Meanwhile,temperature sensing tests were conducted for the sensor in the temperature range of 30℃to 80℃,with a sensitivity of 4.42739 nm·℃^(-1).展开更多
文摘A fiber optic temperature sensor based on a helical cylindrical line for high-sensitivity temperature measurement is designed.The sensor is constructed by spirally winding a single-mode optical fiber at a pitch of 9 mm to 10 mm for 2 cm to 3 cm around an Acrylonitrile Butadiene Styrene plastic(ABS)plastic rod as the axis.By means of helical bending,the fundamental mode leaks into the cladding to excite the cladding mode,thereby forming mode interference between the cladding mode and the fundamental mode for temperature information sensing.Through the optimization of the existing fiber bending simulation model,a theoretical model for the internal light field distribution of the fiber after helical bending is calculated,which visually demonstrates the distribution of the cladding mode and the fundamental mode,confirming the feasibility of the interference between the cladding mode and the fundamental mode.Meanwhile,temperature sensing tests were conducted for the sensor in the temperature range of 30℃to 80℃,with a sensitivity of 4.42739 nm·℃^(-1).
