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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 optical fiber sensor based on a corrosive multimode fiber (MMF) cascade is proposed. The MMF1 with a core diameter of 50 μm was welded to the left side to form a sensing area with a corroded large core MMF2 with a core diameter of 105 μm. In the experiment, the cladding of MMF2 was removed by etching with HF solution. Due to the mismatch of the core, multiple core modes are generated inside the two sections of the MMF, interfering with each other, resulting in a series of interference peaks with different sensitivity characteristics. Using the difference of the sensitivity of different troughs in the interference spectrum to temperature and liquid level, simultaneous measurement of temperature and liquid level can be realized. The temperature sensitivities of three troughs were measured respectively at 0.066nm / ℃, 0.139nm / ℃ and 0.031nm / ℃. The experimental results show that the sensitivity of the sensor to brine level is high, Liquid level sensitivity up to -1.251nm / mm. Experiments show that the sensing system in this paper has low cost and simple structure, and can be used for simultaneous measurement of temperature and liquid level. It has potential applications in petroleum exploration and bio-pharmaceutical industries.