基于纤芯偏移衰耗的单模光纤液位传感器  

Liquid Level Sensor Based on Fiber Core-offset Attenuation

作　　者：王婷婷[1,2] 王鸣[2] 

机构地区：[1]南京信息工程大学江苏省气象探测与信息处理重点实验室,南京210044 [2]南京师范大学江苏省光电技术重点实验室,南京210023

出　　处：《光电子技术》2012年第4期222-225,共4页Optoelectronic Technology

基　　金：高等学校博士学科点专项科研基金(20113207110004)

摘　　要：提出了一种基于纤芯偏移衰耗的全光纤迈克耳逊干涉型液位传感器。理论和实验结果表明,传感器的反射谱的条纹对比度受浸在被测液体中的干涉臂臂长影响,当液位变化0～30mm,干涉条纹对比度变化约3dB,在线性区其液位灵敏度约为0.84dB/mm。此外该传感器对温度不敏感,在30°C～80°C范围内,且没有任何温度补偿情况下,被测液位误差小于1%。该液位传感器有很好的鲁棒性和重复性,制作工艺简单,成本低,在实际工业应用中具有广泛的应用前景。An all-fiber liquid level sensor based on core-offset attenuator is proposed and demonstrated. The interference fringe is affected by the fraction of the length of the interferome- teric arm that is surrounded by the liquid. The experiments show that for a liquid level variation of 30ram, the maximum difference of attenuation changes about 3dB. Also in the linear region, a sensitivity of 0.84dB/mm is achieved. For a temperature range from 30 ℃to 80 ℃, the measured liquid level fluctuates less than 1% without any temperature compensation. The liquid level sensor reported in this paper appears is proved more robust and repeatable, and its ease of fabrication makes it a low cost alternative to existing fiber liquid level sensor.

关 键 词：纤芯偏移衰耗 迈克耳逊干涉仪 液位传感 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]