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介绍了一种可测量相对湿度的March-Zehnder(MZ)干涉的湿度光纤传感器,其传感结构是在两段标准单模之间腰椎放大熔接一段长为15 mm的单模光纤,并在中间的单模部分涂上一层5%的聚乙烯醇(PVA)。PVA的折射率随着环境湿度的变化而改变,从而使包层模有效折射率发生变化。当中间单模光纤周围环境湿度发生变化时,相应干涉峰中心波长也会发生移动,通过测量透射光谱来测量包层周围环境的湿度变化。实验测得该湿度传感器的灵敏度为0.0983 nm/%RH(RH表示相对湿度)。实验也证明基于MZ干涉的湿度光纤传感器具有良好的稳定性等一系列突出的优点。
A March-Zehnder (MZ) interferometric humidity fiber optic sensor capable of measuring relative humidity is introduced. Its sensing structure is a single-mode optical fiber with a length of 15 mm enlarged and welded to the lumbar spine between two standard single-mode modules. Part of the single-mode coated with a layer of 5% polyvinyl alcohol (PVA). The refractive index of PVA changes with the change of ambient humidity, so that the effective refractive index of cladding mode changes. When the humidity around the middle single-mode fiber changes, the center wavelength of the corresponding interference peak will also shift. By measuring the transmission spectrum, the change of the humidity around the cladding is measured. The sensitivity of the humidity sensor measured experimentally was 0.0983 nm /% RH (RH indicates relative humidity). Experiments also prove that the humidity optical fiber sensor based on MZ interference has a series of outstanding advantages such as good stability.