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基于光纤准直器的反射式盐度传感器
引用本文:肖冬瑞,黄旭光,姚胜兴,李祖林,洪俊. 基于光纤准直器的反射式盐度传感器[J]. 红外与激光工程, 2018, 47(7): 720004-0720004(6). DOI: 10.3788/IRLA201847.0720004
作者姓名:肖冬瑞  黄旭光  姚胜兴  李祖林  洪俊
作者单位:1.湖南工学院 光电信息处理与检测重点实验室,湖南 衡阳 421002;
基金项目:国家科技支撑计划(2011BAF06B02)
摘    要:设计了一种新颖的光学盐度传感器,该传感器采用基于光纤准直器结合双通道反射原理而设计,特别适用于长距离的盐度值测量(盐度值在设计中用不同浓度的氯化钠溶液表示)。为了验证该传感器的性能,设计并实施了一个对比实验。实验系统是基于菲涅耳反射原理的双通道系统,一路通道接测量传感器,另外一路通道接普通的带保护层的光纤端子。主要创新点和先进性是:普通的光纤准直器可直接用作盐度值测量传感器,尤其是实验表明该传感器的信噪比至少比普通光纤头式传感器高6.11 dB,等价测量距离至少延长了30 km。实验同时表明温度的影响值为0.005 16 dB/℃,温度对测量值影响很小,而且该传感器系统还可以有效消除光源和外界环境带来的干扰。

关 键 词:盐度传感器   光纤准直器   相对反射强度
收稿时间:2018-02-10

Salinity sensor based on the back reflection on a fiber collimator
Affiliation:1.Key Laboratory of Photoelectric Information Processing and Detecting,Hunan Institute of Technology,Hengyang 421002,China;2.Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510006,China;3.Key Laboratory of Signal Processing,Hunan Institute of Technology,Hengyang 421002,China
Abstract:A new optical salinity sensor was proposed, which was designed by an optical collimator, based on a two-channel back reflection technique, and especially suitable for the long distance measurement of salinity (salinity was demonstrated by different concentrations of sodium chloride in de-ionized water). To demonstrate the performance of this new sensor, a comparative experiment was conducted. The experimental system was based on the structure of two Fresnel-back-reflection channels, one of which was designed with the measuring sensor, and the other was a fiber end with protective cladding. The main innovation and advantages of this sensor were that the common collimator could be directly used as a salinity sensor. Especially, the experimental results showed the signal to noise ratio(SNR) of this measuring method by using the collimator-sensor was at least 6.11 dB more than the common method by using fiber-sensor and the equivalent extended measurement distance of the system was at least extended by 30 km. The experimental results also show the temperature influence was estimated to be 0.005 16 dB/℃, which meant the temperature has little influence on the measurement, and also the influences resulted from fluctuation of light source and environment can be effectively eliminated.
Keywords:
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