基于倾斜光纤布拉格光栅的乙醇汽油中乙醇含量检测  

Detection of Ethanol Content in Ethanol Gasoline Based on Tilted Fiber Bragg Gratings

作　　者：黄妍[1,2] 李培岩[1] 吕国辉 李宏伟[1,2] 王成祥[1] 姚哲理 Huang Yan;Li Peiyan;LüGuohui;Li Hongwei;Wang Chengxiang;Yao Zheli(College of Electronic Engineering,Heilongjiang University,Harbin,Heilongjiang 150080,China;National and Local Engineering Research Center of Optical Fiber Sensing Technology,Heilongjiang University,Harbin,Heilongjiang 150080,China)

机构地区：[1]黑龙江大学电子工程学院,黑龙江哈尔滨150080 [2]黑龙江大学光纤传感技术国家地方联合工程研究中心,黑龙江哈尔滨150080

出　　处：《激光与光电子学进展》2022年第1期103-109,共7页Laser & Optoelectronics Progress

基　　金：黑龙江省省属高等学校基本科研业务费科研项目(KJCX201908)。

摘　　要：为替代现有加油站人工测量乙醇含量方式和提高站端油品质量检测效率,基于倾斜光纤布拉格光栅(TFBG)对外界折射率的敏感特性,使其能够反映出乙醇含量不同导致的乙醇汽油折射率变化,提出一种对乙醇汽油中乙醇含量进行现场实时检测的新方法。利用耦合模理论对TFBG的光谱特点进行了分析,并探究了TFBG在乙醇汽油中乙醇含量检测过程中的传感特性。实验结果表明,所提方法在乙醇含量为8.3%~14.3%的乙醇汽油检测中的灵敏度为6.5 nm/RIU(RIU为折射率单位),线性拟合度为0.949。通过波长解调方法对E10乙醇汽油样品进行传感器的检测精度验证,乙醇体积分数的检测值为10.2%,相对误差为2%,验证了TFBG用于乙醇汽油中乙醇含量检测的可行性。To replace the existing manual method for measuring the ethanol content in petrol stations and improve the detection efficiency of oil quality at the station end,a new method for the on-site real-time detection of the ethanol content in ethanol gasoline is proposed.The proposed method is based on the refractive index sensitivity of the tilted fiber Bragg grating(TFBG)and can reflect changes in the refractive index of ethanol gasoline attributed to different ethanol contents.The spectral characteristics of the TFBG are analyzed using the couple model theory,and the sensing characteristics of the TFBG for ethanol content detection in ethanol gasoline are investigated.Experimental results show that in the detection of ethanol gasoline with ethanol contents of 8.3%-14.3%,the proposed method achieves a sensitivity of 6.5 nm/RIU(RIU refers to the refractive index unit)and a linear fitting degree of 0.949.The detection accuracy of the E10 ethanol gasoline sample is verified using the wavelength demodulation method,yielding a detection value of the ethanol volume fraction of 10.2%and a relative error of 2%.These findings verify the feasibility of TFBG for ethanol content detection in ethanol gasoline.

关 键 词：光纤光学 倾斜光纤布拉格光栅 乙醇汽油 乙醇含量 波长解调 折射率 

分 类 号：TN253[电子电信—物理电子学]