摘要
为了提高光纤表面等离子共振温度传感器检测的适用条件,减少传感器对待测传感参量折射率的限制,避免引入对温度敏感的低折射率媒介,本文中将具有大倏逝场的微纳光纤放置于蒸镀金属膜的氟化镁衬底上,得到光纤表面等离子共振温度传感器结构。结果表明:通过使用传输矩阵的理论模型计算该结构中光纤折射率和氟化镁折射率变化对透射率影响,结合光纤和氟化镁的热光系数,分别得到约118、35 pm/℃的温度灵敏度,在光纤折射率增大对透射谱产生蓝移和氟化镁折射率增大对透射谱产生红移的共同作用下,该传感结构综合得到约153 pm/℃的传感器灵敏度。通过计算明确金膜厚度、光纤直径和光纤-金膜接触区宽度等不同的结构参量对透射率的影响。
To improve the applicable conditions for the detection of plasmon resonance temperature sensor on the surface of the optical fiber,reduce the limit of the refractive index of the sensor to be measured,and avoid the use of temperature-sensitive low refractive index media,the structure of the fiber surface plasmon resonance temperature sensor was designed by placing the micro nano fiber,in which existed large evanescent field,on the metal film,which was evaporated on a magnesium fluoride substrate.The influence of the refractive index change of the optical fiber and magnesium fluoride on the transmittance in designed structure was calculated by using the theoretical model of the transmission matrix.The results show that,combined the calculated results with the thermo optic coefficients,temperature sensitivities about 118,35 pm/℃for optical fiber sensing and magnesium fluoride sensing are obtained.The refractive index increases of optical fiber cause blue shifts of transmission spectra,and red shifts are caused by refractive index increases of magnesium fluoride.Comprehensively considering the effect of these wavelength shifts,we obtain a sensitivity about 153 pm/℃for the designed sensing structure.The influences on transmission spectra caused by different structural parameters,such as the width of contact area of fiber and gold-film,fiber diameter and the thickness of gold film,are also analyzed.
作者
陶俞羽
于洋
刘嫱
TAO Yuyu;YU Yang;LIU Qiang(School of Computer,Electronics and Information,Nanning 530004,China;College of Meteorology and Oceanology,National University of Defense Technology,Changsha 410073,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2023年第1期173-180,共8页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(62171144,61965003)
广西自然科学基金项目(2018GXNSFAA294133,2021GXNSFDA076001)。
关键词
光纤
光纤传感器
表面等离子共振
温度传感器
optical fiber
optical fiber sensor
surface plasmon resonance
temperature sensor
