摘要
提出了一种新颖的基于腐蚀型多模光纤(MMF)级联的干涉型光纤传感器。在芯径为50μm的MMF1左侧熔接一段被腐蚀的芯径为105μm的大芯径MMF2构成传感区域。实验中,MMF2的包层采用HF溶液腐蚀的方法去除。由于纤芯失配,两段MMF内部均产生多种纤芯模式,它们之间相互干涉,随之产生一系列具有不同灵敏特性的干涉峰。利用干涉谱中不同波谷对温度和液位的灵敏度差异,实现对温度和液位的同时测量。测得3个波谷的温度灵敏度分别为0.066nm/℃、0.139nm/℃和0.031nm/℃;通过对水和盐水的液位进行实验对比发现,传感器对盐水的液位灵敏度较高,测得液位灵敏度最高可达-1.251nm/mm。实验表明,本文传感系统成本低、结构简单,可用于温度和液位的同时测量,在石油开采、生物制药等方面具有潜在的应用价值。
A novel interferometric fiber sensor based on different multimode core diameters of optical fiber cascade is proposed.The core diameter of the multimode optical fiber （MMF1） is 50μm,on its left side,a large core multimode fiber （MMF2） with the cladding re moved is welded,and its core diamet er is 105μm,constructing the sensing region.In the experiment,the cladding of MMF2is removed by the hydrof luoric acid （HF）.Due to the fiber core mismatch,both of multimode fibers will produce a variety of core modes,mutual interference will happen among them,and then there will be a series of interference dips wi th different sensitive characteristics. This paper uses these interference dips with different sensitivities to tempera ture and liquid level to realize the simultaneous measurement of them.The experimental results show that the temperature sensitivities of the three interference dips are 0.066nm/℃, 0.139nm/℃and 0.031nm/℃,respectively. We take the levels of sensitivities to water and salt water of the three dips f or experiment comparison,and the level of one of the three dips sensitivities is up to -1.251nm/mm.The experiment pro ves that this sensor system is low cost,simple structure,so it can be used for temperature and liquid level measure ment at the same time,in oil production,biological and pharmaceutical etc,it has potential application value.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2014年第1期118-122,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61107052)
天津市青年基金(13JCQNJC01800)
天津市自然科学基金(11JCYBJC00100)资助项目
关键词
光纤传感器
多模光纤(MMF)
温度
液位
fiber optic sensor
multimode fiber （MMF）
temperature
liquid level
