摘要
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 kind of relative humidity sensor based on March-Zehnder （MZ） interference is proposed in this paper. The sensor is composed by splicing with a waist enlarged single mode fiber （SMF） with a length of 15 mm between two SMFs, whose surface is coated with a thin layer of 5% polyvinyl alcohol （PVA）. With the humidity changing, and the effective index of the cladding mode changes. When the relative humidity changs, the central wavelength of the interference peak shifts, so that the relative humidity can be obtained by measuring the sensor＇s transmission spectrum. The sensitivity of the proposed humidity sensor is 0.0983 nm/% RH measured by experiment. Experiments also show that the MZ-based humidity sensor has a good stability and a series of other outstanding advantages.
出处
《激光与光电子学进展》
CSCD
北大核心
2014年第6期38-41,共4页
Laser & Optoelectronics Progress
基金
浙江省自然科学基金(LY13F050004)
