中国激光, 2010, 37 (5): 1280, 网络出版: 2010-05-11
基于多纵模光纤激光器的有源位移传感器
Multi-Longitudinal-Mode Fiber Laser Based Displacement Sensor
激光技术 光纤激光器 有源传感器 多纵模 拍频 laser technology fiber laser active sensor multi-longitudinal-mode beat frequency
摘要
提出并实现了一种基于多纵模分布布拉格反射(DBR)光纤激光器的有源位移传感器,利用多纵模DBR光纤激光器的各纵模之间的拍频(LMB)进行传感。该传感器采用等强度悬臂梁结构,通过激光器各纵模之间拍频的变化来测量悬臂梁自由端的位移。在-60.17-59.75 mm的位移变化范围内,拍频从273.85-272.908 MHz基本成线性变化,线性拟合度达到0.9993,与理论推导相吻合。重复测量表明,该传感器的稳定性很好。根据测量仪器的最小分辨度以及频谱线宽,该传感器的测量精度为3.8×10-3 mm。
Abstract
A multi-longitudinal-mode Bragg reflector (DBR) fiber laser based displacement sensor is reported and implemented. Using cantilever structure,the fiber laser sensor is on the basis of beat frequency demodulation. When the free end of cantilever has a displacement,the longitudinal mode beat (LMB) will change correspondingly. Within the displacement range of -60.17-59.75 mm,the LMB changes from 273.85-272.908 MHz linearly,with a linearity of 0.9993,which agrees with the theoretically analysis. The sensor has a high repeatability and a precision of 3.8×10-3 mm.
罗建花, 张昊, 刘波, 贾承来, 阎少林, 马秀荣. 基于多纵模光纤激光器的有源位移传感器[J]. 中国激光, 2010, 37(5): 1280. Luo Jianhua, Zhang Hao, Liu Bo, Jia Chenglai, Yan Shaolin, Ma Xiurong. Multi-Longitudinal-Mode Fiber Laser Based Displacement Sensor[J]. Chinese Journal of Lasers, 2010, 37(5): 1280.
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