基于FP腔的大量程超声解调系统研究  

Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity

作　　者：高在青 张示城 钮月萍[1] 龚尚庆[1] GAO Zai-qing;ZHANG Shi-cheng;NIU Yue-ping;GONG Shang-qing(School of Science,East China University Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学理学院,上海200237

出　　处：《光通信研究》2020年第4期54-57,共4页Study on Optical Communications

摘　　要：针对光纤布拉格光栅(FBG)超声探测传感器测量灵敏度和量程相互制约的问题,文章提出了一种基于法布里珀罗(FP)腔和π相移FBG(π-FBG)的解调方案。文章分析了利用FP腔解调的原理并进行了详细的数值仿真分析。理论分析表明,利用FP腔的两个纵模作为一组解调器同时解调,可将系统灵敏度提高两倍,并且具有很好的线性度。扩展到多个纵模时可构建解调器阵列,从而极大地提高了系统的量程,有效地解决了测量灵敏度和量程相互制约的问题。数值仿真结果表明,该方案在实际可操作参数范围内切实可行,并具有灵敏度高和响应速度快等优势。To balance the trade-off between the measurement sensitivity and range of the Fiber Bragg Grating(FBG) ultrasonic detection sensor, a demodulation scheme based on Fabry Perot(FP) cavity and π-phase-shifted FBG(π-FBG) is proposed. The principle of demodulation based on FP cavity is analyzed and numerically simulated in detail. A group of demodulators consisting of two longitudinal modes of the FP cavity can double the system sensitivity, and has good linearity. A demodulator array can be constructed when expanding to multiple modes, which can greatly increase the system range, and effectively balance the trade-off between measurement sensitivity and range. Numerical simulation results show that this scheme is feasible under the practical parameters, and has the merits of high sensitivity and fast response speed.

关 键 词：π相移光纤布拉格光栅 大量程 法布里珀罗腔 解调系统 超声传感 

分 类 号：TN253[电子电信—物理电子学]