A highly sensitive optical fiber temperature sensor based on a section of liquid-filled silica capillary tube(SCT)between single mode fibers is proposed. Two micro-holes are drilled on two sides of SCT directly by usi...A highly sensitive optical fiber temperature sensor based on a section of liquid-filled silica capillary tube(SCT)between single mode fibers is proposed. Two micro-holes are drilled on two sides of SCT directly by using femtosecond laser micromachining, and liquid polymer is filled into the SCT through the micro-holes without any air bubbles and then sealed by using ultra-violet(UV) cure adhesive. The sidewall of the SCT forms a Fabry–Perot resonator, and loss peaks are achieved in the transmission spectrum of the SCT at the resonant wavelength. The resonance condition can be influenced by the refractive index variation of the liquid polymer filled in SCT, which is sensitive to temperature due to its high thermooptical coefficient(-2.98 × 10^-4℃^-1). The experimental result shows that the temperature sensitivity of the proposed fiber structure reaches 5.09 nm/℃ with a perfect linearity of 99.8%. In addition, it exhibits good repeatability and reliability in temperature sensing application.展开更多
An ultra-longer fiber cantilever taper for simultaneous measurement of the temperature and relative humidity(RH)with high sensitivities was proposed.The structure was fabricated by using the simple and cost-effective ...An ultra-longer fiber cantilever taper for simultaneous measurement of the temperature and relative humidity(RH)with high sensitivities was proposed.The structure was fabricated by using the simple and cost-effective method only including fiber cleaving,splicing,and tapering.The length of the cantilever taper is about 1.5 mm.The dip A and dip B were measured simultaneously,owing to the ultra-long length and super-fine size,the temperature sensitivities of the dip A and dip B reached as high as 127.3 pm/℃ and 0 pm/℃ between 25℃ and 50℃,and the RH sensitivities are31.2 pm/%RH and29.2 pm/%RH with a broad RH interval ranging from 20%RH to 70%RH.Besides,the proposed structure showed good linearity in the sensing process and small temperature crosstalk.It will be found in wide applications in environmental monitoring,food processing,and industries.展开更多
基金Project supported by the Scientific Research Project of Institutions of Higher Learning in Inner Mongolia Autonomous Region,China(Grant No.NJZY19214)
文摘A highly sensitive optical fiber temperature sensor based on a section of liquid-filled silica capillary tube(SCT)between single mode fibers is proposed. Two micro-holes are drilled on two sides of SCT directly by using femtosecond laser micromachining, and liquid polymer is filled into the SCT through the micro-holes without any air bubbles and then sealed by using ultra-violet(UV) cure adhesive. The sidewall of the SCT forms a Fabry–Perot resonator, and loss peaks are achieved in the transmission spectrum of the SCT at the resonant wavelength. The resonance condition can be influenced by the refractive index variation of the liquid polymer filled in SCT, which is sensitive to temperature due to its high thermooptical coefficient(-2.98 × 10^-4℃^-1). The experimental result shows that the temperature sensitivity of the proposed fiber structure reaches 5.09 nm/℃ with a perfect linearity of 99.8%. In addition, it exhibits good repeatability and reliability in temperature sensing application.
基金Project supported by the Scientific Research Project of Institutions of Higher Learning in Inner Mongolia Autonomous Region,China(Grant No.NJZY19214)the Natural Science Foundation of Inner Mongolia Autonomous Region,China(Grant No.2018MS05064)+2 种基金the Education and Teaching Research Project of Chifeng College(Grant No.JYXMY202025)the Applied Model Curriculum Construction Project of Chifeng College(Grant No.SFK20200904)the Construction Project of the Key Laboratory of Chifeng College(Grant No.CFXYZD202007).
文摘An ultra-longer fiber cantilever taper for simultaneous measurement of the temperature and relative humidity(RH)with high sensitivities was proposed.The structure was fabricated by using the simple and cost-effective method only including fiber cleaving,splicing,and tapering.The length of the cantilever taper is about 1.5 mm.The dip A and dip B were measured simultaneously,owing to the ultra-long length and super-fine size,the temperature sensitivities of the dip A and dip B reached as high as 127.3 pm/℃ and 0 pm/℃ between 25℃ and 50℃,and the RH sensitivities are31.2 pm/%RH and29.2 pm/%RH with a broad RH interval ranging from 20%RH to 70%RH.Besides,the proposed structure showed good linearity in the sensing process and small temperature crosstalk.It will be found in wide applications in environmental monitoring,food processing,and industries.
