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根据马赫-曾德尔干涉(MZI)原理,在两段标准单模光纤(SMF)中间腰椎放大熔接长为2cm的细芯SMF(TCSMF),构成光纤传感器。利用TCSMF的包层模、纤芯模对折射率和温度的灵敏度差异,通过检测透射光谱中不同级次的干涉谷的特征波长变化,结合敏感矩阵实现对折射率/温度的双参数同时测量。实验选取在1 502.54nm波长处干涉谷的折射率和温度的灵敏度分别为270.517 1nm/RIU(其中RIU为折射率单位)和19.3pm/℃;在1 521.64nm波长处干涉谷的折射率灵敏度为239.510 3nm/RIU,对温度不敏感。根据0.01nm波长分辨率的光谱仪(OSA),本文光纤传感器对折射率和温度的分辨率分别为3.6966×10-5 RIU和0.5181℃,也可以应用于其他参数的测量,具有良好的应用和发展前景。
According to the Mach-Zehnder Interference (MZI) principle, a fine core SMF (TCSMF) having a length of 2 cm was fused on the middle section of two standard SMF to form an optical fiber sensor. By using the TCSMF cladding mode and core mode sensitivity difference between refractive index and temperature, two-parameter simultaneous measurement of refractive index and temperature can be achieved by detecting the characteristic wavelength variation of different levels of interfering trough in the transmission spectrum and combining with the sensitive matrix. The sensitivities of the refractive index and temperature of the interfering trough at the wavelength of 1 502.54 nm are selected as 270.517 1 nm / RIU (where RIU is the refractive index unit) and 19.3 pm / ° C respectively. The refractive index sensitivity of the interference valley at the wavelength of 1 521.64 nm is 239.510 3nm / RIU, insensitive to temperature. According to the spectrometer (OSA) with 0.01nm wavelength resolution, the refractive index and temperature resolution of the optical fiber sensor in this paper are 3.6966 × 10-5 RIU and 0.5181 ℃, respectively. It can also be applied to the measurement of other parameters and has good application and development prospect.