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三波长数字相位解调法解调误差及影响因素

赵文涛 宋凝芳 宋镜明 吴蓉

赵文涛, 宋凝芳, 宋镜明, 等 . 三波长数字相位解调法解调误差及影响因素[J]. 北京航空航天大学学报, 2017, 43(8): 1654-1661. doi: 10.13700/j.bh.1001-5965.2016.0568
引用本文: 赵文涛, 宋凝芳, 宋镜明, 等 . 三波长数字相位解调法解调误差及影响因素[J]. 北京航空航天大学学报, 2017, 43(8): 1654-1661. doi: 10.13700/j.bh.1001-5965.2016.0568
ZHAO Wentao, SONG Ningfang, SONG Jingming, et al. Demodulation error and influencing factor of three-wavelength digital phase demodulation method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(8): 1654-1661. doi: 10.13700/j.bh.1001-5965.2016.0568(in Chinese)
Citation: ZHAO Wentao, SONG Ningfang, SONG Jingming, et al. Demodulation error and influencing factor of three-wavelength digital phase demodulation method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(8): 1654-1661. doi: 10.13700/j.bh.1001-5965.2016.0568(in Chinese)

三波长数字相位解调法解调误差及影响因素

doi: 10.13700/j.bh.1001-5965.2016.0568
基金项目: 

国家自然科学基金 61575013

详细信息
    作者简介:

    赵文涛  男, 硕士研究生。主要研究方向:先进光纤传感

    宋凝芳  女, 博士, 教授, 博士生导师。主要研究方向:先进光纤传感和空间光电技术

    通讯作者:

    宋镜明, E-mail: Songnf@buaa.edu.cn

  • 中图分类号: V241.9;TN253

Demodulation error and influencing factor of three-wavelength digital phase demodulation method

Funds: 

National Natural Science Foundation of China 61575013

More Information
  • 摘要:

    介绍了光纤法布里-珀罗(F-P)传感器的传统解调方法,系统地推导了针对非本征法布里-珀罗干涉型(EFPI)传感器解调的三波长数字相位解调法的解调原理,仿真和实验分析了三波长数字相位解调法的解调误差。仿真分析结果表明,相位偏离正交关系是限制解调的最主要因素,要保证解调误差在15 nm以内,腔长变化应小于在正交腔长处2 μm的范围。采用3个独立的激光光源进行实验,实验结果表明,在正交腔长附近1 μm范围内变化,解调腔长误差小于12 nm,重复性误差小于10 nm,解调具有良好的稳定性。

     

  • 图 1  双波长正交法原理图[17]

    Figure 1.  Schematic of two-wavelength orthogonal method[17]

    图 2  三波长数字相位解调系统结构简图

    Figure 2.  Simplified structure of three-wavelength digital phase demodulation system

    图 3  相位变化与腔长关系

    Figure 3.  Relationship between phase variation and cavity length

    图 4  F-P干涉仪的原理

    Figure 4.  Principle of F-P interferometer

    图 5  实际与理论反射光强对比

    Figure 5.  Comparison between actual reflected light intensity and theoretical reflected light intensity

    图 6  实际与理论解调相位的对比

    Figure 6.  Comparison between actual demodulated phase and theoretical demodulated phase

    图 7  双光束近似引起的解调误差

    Figure 7.  Demodulation error caused by approximation of two beam interference

    图 8  对比度随腔长变化量的关系

    Figure 8.  Variation of fringe visibility factors with cavity length

    图 9  忽略对比度差异引起的解调误差

    Figure 9.  Demodulation error caused by ignoring differences of fringe visibility factors

    图 10  相位的正交关系

    Figure 10.  Orthogonal relationship of phase

    图 11  偏离相位正交关系

    Figure 11.  Deviation from orthogonal relationship of phase

    图 12  偏离相位正交关系引起的解调误差

    Figure 12.  Demodulation error caused by deviation from orthogonal relationship of phase

    图 13  标定、解调与仿真对比关系图

    Figure 13.  Comparison of calibration, demodulation and simulation

    表  1  标定腔长与解调腔长对比

    Table  1.   Comparison between calibration cavity length and demodulation cavity length

    压力/MPa标定腔长/μm解调腔长/μm误差/nm
    2100.614100.6228
    4100.418100.42911
    6100.231100.24312
    8100.043100.0529
    1099.85999.8656
    下载: 导出CSV

    表  2  解调的重复性误差

    Table  2.   Repeatability error of demodulation value

    初始压力/MPa解调均值/μm误差/nm
    2100.8000
    4100.7946
    6100.8099
    8100.7919
    10100.7991
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-07-04
  • 录用日期:  2016-08-10
  • 刊出日期:  2017-08-20

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