论文部分内容阅读
根据马赫-曾德尔干涉仪(MZI)原理在两根标准单模光纤(SMF)中间熔接一段保偏光纤(PMF),通过电弧放电和熔接推挤形成凹-凸型锥,构成温度光纤传感器。利用PMF的包层模、纤芯模对温度的灵敏度差异,通过检测透射光谱中不同干涉谷的波长和强度变化,实现对温度的测量。实验表明,在25~70℃的范围内,当PMF的长为30mm时,在1 533.68nm和1 560.92nm时的干涉谷对应的波长灵敏度为0.029nm/℃和0.040nm/℃,对应的强度灵敏度为0.12dB/℃和0.097dB/℃;当PMF的长度为40mm时,在1 540.54nm和1 568.64nm时的干涉谷对应的波长灵敏度为0.083 5nm/℃和0.099 8nm/℃,强度灵敏度为0.152dB/℃和-0.211dB/℃。根据光谱仪0.01nm和0.01dB的分辨率,对应的波长和强度分辨率分别为0.100℃和0.047℃。
According to the Mach-Zehnder Interferometer (MZI) principle, a PMF is fused between two standard single-mode fibers (SMFs), and a concave-convex cone is formed by arc discharge and welding to form a temperature fiber sensor. Using the PMF cladding mode and the sensitivity difference of the core mode to the temperature, the temperature measurement can be realized by detecting the wavelength and intensity change of different interfering troughs in the transmission spectrum. Experiments show that when the length of PMF is 30mm, the wavelength sensitivity of the interference valley at 1 533.68nm and 1 560.92nm is 0.029nm / ° C and 0.040nm / ° C in the range of 25-70 ° C, and the corresponding intensity The sensitivities are 0.12dB / ℃ and 0.097dB / ℃ respectively. When the length of PMF is 40mm, the corresponding sensitivity of the interfering trough at 1 540.54nm and 1 568.64nm is 0.083 5nm / ℃ and 0.099 8nm / ℃, and the intensity sensitivity is 0.152 dB / ° C and -0.211 dB / ° C. According to the spectrometer 0.01nm and 0.01dB resolution, the corresponding wavelength and intensity resolution were 0.100 ℃ and 0.047 ℃.