Liquid level sensor based on POF (plastic optical fiber) optical fiber macrobending

基于pof光纤宏弯的液位传感器

Abstract

本发明涉及一种基于POF光纤宏弯的液位传感器,是用一根POF裸光纤折弯制作的顶部宏弯弯曲半径为2.5mm单宏弯光纤环形结构,以其顶部宏弯部分作为探头,POF裸光纤两个末端有光纤接头;用于封装该单宏弯光纤环形结构的固定结构,探头从该固定结构顶部露出。本发明采用单宏弯光纤环型结构设计,单纯利用光纤宏弯增强CMFTIR效应,实现了区分度1.06dB,满足液位测量需求。且无需双光纤耦合,因此简化了工艺难度,结构也更加紧凑,适宜于在狭窄空间内使用。同时SMBFL结构液体沾粘度低,极大的降低初浴“误差”;SMBFL直接探测功率较强的明场信号,满足长距离传输的需求。
The invention relates to a liquid level sensor based on POF (plastic optical fiber) optical fiber macrobending. The liquid level sensor comprises a single macrobending optical fiber annular structure and a fixing structure, wherein the single macrobending optical fiber annular structure is manufactured through bending POF bare optical fiber and has the top macrobending radius being 2.5mm, the top macrobending part of the single macrobending optical fiber annular structure is used as a probe, two tail ends of the POF bare optical fiber are provided with optical fiber joints, the fixing structure is used for encapsulating the single macrobending optical fiber annular structure, and the probe is exposed out from the fixing structure. The liquid level sensor has the advantages that the design of the single macrobending optical fiber annular structure is adopted, the optical fiber macrobending is singly used for enhancing the CMFTIR (cladding mode frustratedtotal internal reflection) effect, the distinction degree being 1.06dB is realized, and the liquid level measurement requirement is met. In addition, the double optical fiber coupling is not needed, so that the process difficulty is simplified, the structure is more compact, and the liquid level sensor is suitable for being used in a narrow space. Meanwhile, the liquid viscosity of an SMBFL (single macro-bend fiber loop) structure is low, the initial bath error is greatly reduced, the SMBFL directly detects bright field signals with higher power, and the requirement of long-distance transmission is met.

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