文献类型：期刊文献

中文题名：基于FP腔的大量程超声解调系统研究

英文题名：Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity

作者：高在青[1];张示城[1];钮月萍[1];龚尚庆[1]

机构：[1]华东理工大学理学院,上海200237

年份：2020

期号：4

起止页码：54

中文期刊名：光通信研究

外文期刊名：Study on Optical Communications

收录：北大核心:【北大核心2017】；

语种：中文

中文关键词：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

外文关键词：π-FBG;large measurement range;FP cavity;demodulation system;ultrasonic sensor

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.