论文部分内容阅读
介绍了一种基于光纤气泡和纤芯失配的Mach-Zehnder干涉液体折射率传感器.将两根纤芯经过腐蚀的普通单模光纤熔接在一起,在熔接点处形成一个气泡,在距气泡20 mm处级联一段20 mm的细芯光纤,再接入一段单模光纤,形成单模光纤-气泡-单模光纤-细芯光纤-单模光纤结构的传感器.气泡与光纤芯径失配处的两个节点起到光纤耦合器的作用,从而形成光纤Mach-Zehnder干涉仪.环境液体折射率的变化,将使得传感器透射谱能量发生变化,通过测量干涉谱波峰峰值能量从而实现对折射率的测量.并对所制作传感器的折射率响应特性进行了实验研究,实验结果表明干涉谱波峰峰值能量与环境液体折射率之间存在良好的线性关系,当环境液体折射率变化范围在1.351—1.402时,响应灵敏度为143.537 dB/RIU,线性度0.996.该传感器在生物化学领域有较好的应用前景.
A Mach-Zehnder interferometric liquid refractive index sensor based on fiber bubble and core mismatch is introduced.A common single-mode optical fiber with two cores corroded is welded together to form a bubble at the welding point, mm at the cascade of a 20 mm fine core fiber, and then access a section of single-mode fiber, the formation of single-mode fiber - bubble - single-mode fiber - fine core fiber - single mode fiber sensor structure. Bubble and fiber core mismatch Of the two nodes play the role of fiber-optic coupler to form a fiber Mach-Zehnder interferometer.Environment liquid refractive index changes, will make the sensor transmission spectrum energy changes, by measuring the peak energy of the interference peak in order to achieve the refractive index The experimental results show that there is a good linear relationship between the peak energy of the interference spectrum and the refractive index of the ambient liquid. When the refractive index of the liquid environment changes from 1.351 to 1.402 , The response sensitivity is 143.537 dB / RIU and the linearity is 0.996. The sensor has a good application prospect in the field of biochemistry.