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

GAO Zai-qing; ZHANG Shi-cheng; NIU Yue-ping; GONG Shang-qing

doi:10.13756/j.gtxyj.2020.04.011

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

- Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity
- Study on Optical communication Issue 4, Pages: 54-57(2020)
- 作者机构：
  
  华东理工大学理学院
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2020.04.011
  CLC： TP212
- Published：2020，
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[1]高在青,张示城,钮月萍,龚尚庆.基于FP腔的大量程超声解调系统研究[J].光通信研究,2020(04):54-57.

GAO Zai-qing, ZHANG Shi-cheng, NIU Yue-ping, et al. Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity. [J]. (4):54-57(2020)
[1]高在青,张示城,钮月萍,龚尚庆.基于FP腔的大量程超声解调系统研究[J].光通信研究,2020(04):54-57. DOI： 10.13756/j.gtxyj.2020.04.011.

GAO Zai-qing, ZHANG Shi-cheng, NIU Yue-ping, et al. Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity. [J]. (4):54-57(2020) DOI： 10.13756/j.gtxyj.2020.04.011.

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。

Abstract

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

Keywords

π-FBGlarge measurement rangeFP cavitydemodulation systemultrasonic sensor

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