基于光学干涉原理的温度传感研究(特邀)  

Research on Temperature Sensing Based on Optical Interference Principle(Invited)

作　　者：仇立强 杨策 张临夏 刘琳 葛宪莹 陈萍萍 孙雨婷 赵昌迪 冉雪婷 倪亮[1] QIU Liqiang;YANG Ce;ZHANG Linxia;LIU Lin;GE Xianying;CHEN Pingping(Beijing Institute of Control and Electronic Technology,Beijing,China)

机构地区：[1]北京控制与电子技术研究所,北京

出　　处：《光电技术应用》2024年第1期46-52,共7页Electro-Optic Technology Application

摘　　要：提出一种基于光学干涉原理的温度传感器。通过在参考光路中引入单模光纤产生高斯光束;在测量光路中引入光纤光栅结构,使入射光通过光纤光栅、准直器产生平行的高斯光束,经螺旋相位板产生带有轨道角动量的拉盖尔-高斯光束,两束光将在合束器上发生干涉,产生螺旋式干涉图像。在测量光路中引入光纤光栅结构,主要是利用光纤光栅的光延迟特性。当环境温度变化时,光在光纤光栅中的传播产生相位延迟,导致测量光路和参考光路之间相位差发生变化,使螺旋干涉图像发生旋转。通过高分辨率相机实时检测干涉图像的变化,并对干涉图像进行图像处理,准确提取干涉图像的变化信息。通过上述方法,使传感器的温度灵敏度达到4.08°/℃,这将在温度传感领域具有重要的应用价值。A temperature sensor based on the principle of optical interference is proposed.A Gaussian beam is generated by introducing a single-mode fiber in the reference optical path,and the fiber Bragg grating structure is in⁃troduced into the measurement optical path.Parallel Gaussian beams are generated by incident light passing through the fiber Bragg grating and collimator.The Laguerre-Gaussian beams with orbital angular momentum are generated through a spiral phase plate.The two beams of light are interfered on the beam combiner,and the spiral interference image is generated.The fiber Bragg grating structure is introduced into the measurement optical path,which mainly uses the optical delay characteristic of fiber Bragg grating.The phase delay of light propagation is gen⁃erated in the fiber Bragg grating when the ambient temperature changes.The phase difference between the measure⁃ment optical path and the reference optical path is changed,resulting in rotation of the spiral interference image.The interference image is detected in real time by a high-resolution camera.Image processing of interference image is executed to extract the change information of interference image accurately.The temperature sensitivity of the sensor reaches 4.08°/℃by the above method,which will have important application value in the field of tempera⁃ture sensing.

关 键 词：光学干涉原理 参考光路 测量光路 干涉图像 温度灵敏度 

分 类 号：TH744.3[机械工程—光学工程]