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
This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the...This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the power transfer between the core modes and the cladding modes during thermally-induced refractive index variations is established based on the mode coupling theory. The results of numerical simulations based on actual laser parameters are presented. Experimental measurements were also carried out, the results showed good agreement with the corresponding simulation results.展开更多
Tilted fiber Bragg gratings(TFBGs) have seen rapid development and widespread deployment in diverse sensing applications, ranging from biochemical detection to in-situ monitoring in energy systems. Their ability to ge...Tilted fiber Bragg gratings(TFBGs) have seen rapid development and widespread deployment in diverse sensing applications, ranging from biochemical detection to in-situ monitoring in energy systems. Their ability to generate rich spectral features via cladding mode coupling enables highly sensitive, multi-parameter, and label-free sensing.However, accurate interrogation typically requires broadband spectral measurements to resolve fine spectral structures-posing significant challenges for scalable and cost-effective multiplexing in practical settings.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).
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61307057 and 61675114)
文摘This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the power transfer between the core modes and the cladding modes during thermally-induced refractive index variations is established based on the mode coupling theory. The results of numerical simulations based on actual laser parameters are presented. Experimental measurements were also carried out, the results showed good agreement with the corresponding simulation results.
文摘Tilted fiber Bragg gratings(TFBGs) have seen rapid development and widespread deployment in diverse sensing applications, ranging from biochemical detection to in-situ monitoring in energy systems. Their ability to generate rich spectral features via cladding mode coupling enables highly sensitive, multi-parameter, and label-free sensing.However, accurate interrogation typically requires broadband spectral measurements to resolve fine spectral structures-posing significant challenges for scalable and cost-effective multiplexing in practical settings.
