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提出了一种锥形三包层石英特种光纤(TTCQSF)的折射率与温度传感器。它是通过对2根单模光纤(SMF)之间熔接的三包层石英特种光纤(TCQSF)熔融拉锥得到的SMF-TTCQSF-SMF级联结构,形成了光纤马赫-曾德尔干涉仪(MZI)。由于TTCQSF纤芯模和包层模之间的光程差会随着外界环境的变化而改变,从而引起传感器干涉谱的变化,因此可以通过检测传感光谱的变化实现对外界物理量的测量。分别对该传感器进行折射率和温度传感实验,实验结果表明,当溶液折射率在1.3350~1.3466范围、温度在25.7℃~94.9℃范围内时,随着折射率和温度的增加,传感器的传输光谱分别出现红移和蓝移现象,其折射率灵敏度和温度灵敏度分别为1673.94 nm/RIU和-0.061 nm/℃,且均具有很好的线性度,其中RIU为单位折射率。该传感器制作简单、灵敏度高,在生物化学、工业生产的折射率和温度测量场合具有较好的应用前景。
A refractive index and temperature sensor with tapered three-clad quartz specialty fiber (TTCQSF) is proposed. It is a SMF-TTCQSF-SMF cascaded structure obtained by melting a triple-clad fused silica (TCQSF) fused taper between two single-mode optical fibers (SMFs) to form an optical fiber Mach-Zehnder interferometer ). Since the optical path difference between the TTCQSF core mode and the cladding mode changes with the change of the external environment, the interference spectrum of the sensor changes. Therefore, the measurement of the external physical quantity can be realized by detecting the change of the sensor spectrum. The refractive index and temperature sensing experiments of the sensor were carried out. The experimental results show that with the refractive index of the solution in the range of 1.3350 ~ 1.3466 and the temperature in the range of 25.7 ℃ ~ 94.9 ℃, with the increase of the refractive index and temperature, the sensor transmission The redshift and blue shift appear in the spectra respectively. The refractive index sensitivity and temperature sensitivity are 1673.94 nm / RIU and -0.061 nm / ° C, respectively, and have good linearity. RIU is the unit refractive index. The sensor has the advantages of simple manufacture and high sensitivity, and has good application prospect in the fields of biochemistry and industrial production of refractive index and temperature measurement.