红外, 2023, 44 (11): 0031, 网络出版: 2024-01-16  

光纤光栅温度传感增敏方法研究

Research on Sensitization Method for Fiber Bragg Grating Temperature Sensing
作者单位
西安石油大学理学院,陕西 西安710065陕西省油气资源光纤探测工程技术研究中心,陕西 西安710065陕西省油气井测控技术重点实验室,陕西 西安710065CNPC重点实验室——油藏光纤动态检测研究室,陕西 西安710065
摘要
针对裸光栅温度灵敏度较低的问题,设计了一种封装方式并进行结构制作。所设计的封装方式是将光纤布拉格光栅(Fiber Bragg Grating,FBG)置入毛细玻璃管中,并填充353ND环氧树脂胶,最后固定在铜片基底上。首先对FBG温度传感及增敏机理进行了理论分析,然后进行结构的设计及制作,最后进行温度传感测试。聚合物353ND和铜片的热膨胀系数显著高于裸光栅,在外界温度发生变化时会对光纤光栅施加附加应力,从而提高其温度灵敏度,并保护FBG传感器的结构。实验结果表明:在40℃至140℃的温度传感测试中,FBG的反射波长保持着不错的线性;温度灵敏度由增敏前的10 pm/℃提升到了21 pm/℃左右,且温度传感特性拟合曲线线性度达到0996以上。
Abstract
Aiming at the problem of low-temperature sensitivity of bare grating, a packaging method is designed and its structure is made. The design packaging mode is as follows: fiber Bragg grating (FBG) is placed in a capillary glass tube, filled with 353ND epoxy resin adhesive, and finally fixed on the copper substrate. In this paper, the mechanism of FBG temperature sensing and sensitization is analyzed theoretically, then the structure is designed and manufactured, and finally the temperature sensing test is carried out. The thermal expansion coefficient of polymer 353ND and copper sheet is significantly higher than that of bare grating, and additional stress is applied to the fiber grating when the external temperature changes, so as to improve its temperature sensitivity and protect the structure of FBG sensor. The experimental results show that the reflected wavelength of FBG maintains good linearity in the temperature sensing test from 40℃ to 140℃. The temperature sensitivity increases from 10 pm/℃ before sensitization to about 21 pm/℃, and the linearity of fitting curve of temperature sensing characteristics reaches more than 0996.

贾振安, 史小宇, 禹大宽, 樊伟. 光纤光栅温度传感增敏方法研究[J]. 红外, 2023, 44(11): 0031. JIA Zhen-an, SHI Xiao-yu, YU Da-kuan, FAN Wei. Research on Sensitization Method for Fiber Bragg Grating Temperature Sensing[J]. INFRARED, 2023, 44(11): 0031.

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