|本期目录/Table of Contents|

 基于卡尔曼滤波的光纤压力信号解调方法(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2017年5期
页码:
353-359
栏目:
精密测量
出版日期:
2017-09-15

文章信息/Info

Title:
  A Demodulation Method of Optical Fiber Pressure Signal
Based on Kalman Filtering
文章编号:
1672-6030(2017)05-0353-07
作者:
 赵美蓉 于锦辉 王进 郑叶龙
 (精密测试技术及仪器国家重点实验室(天津大学),天津300072)
Author(s):
Zhao Meirong Yu Jinhui Wang Jin Zheng Yelong
 (State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China)
关键词:
 光纤法布里珀罗传感系统 热噪声 卡尔曼滤波
Keywords:
 optical fiber Fabry-Perot sensing system thermal noise Kalman filtering
分类号:
TN29
DOI:
10.13494/j.npe.20150128
文献标识码:
A
摘要:
 针对光纤法布里珀罗传感系统长时间运行时,数据采集等电路部分热噪声过大,造成压力信号相位解调误差过大的问题,建立了基于卡尔曼滤波算法的压力解调算法模型,使用卡尔曼滤波算法对光纤压力信号进行去噪处理.经过计算,当信噪比为15 dB的情况下相位解调误差低于0.1 rad,标准差缩小1 000倍,不同信噪比下,滤波后的相位解调标准差稳定在0.012~0.026 rad之间,绝对相位拟合直线的截距稳定在75.8~76.7.实验结果表明,经过降噪滤波处理的信号解调出的结果精度明显改善,提高了系统在噪声条件下的解调精度和整体稳定性.
Abstract:
 For optical fiber Fabry-Perot (F-P)sensing systems, the thermal noise of circuits will increase after a long time operation, leading to large error of phase demodulation of pressure signal. Regarding this problem, a Kalman filtering based pressure demodulation model is established for the optical fiber FP sensing system, and the Kalman filtering algorithm is applied to deal with the fiber optic pressure signal. Simulation results show that the phase demodulation accuracy error is lower than 0.1 rad when signal to noise ratio (SNR) is 15 dB, and that the standard deviation is reduced by 1 000 times.Under different SNRs, the standard deviation of phase demodulation is stable within 0.012—0.026 rad after filtering, and the fitting linear intercept of absolute phase is stable within 75.8—76.7, verifying that the accuracy of the signal demodulation process is improved obviously and can meet the requirements of high precision pressure signal and the system stability.

参考文献/References

备注/Memo

备注/Memo:
收稿日期: 2017-08-10.
作者简介: 赵美蓉(1967— ),女,博士,教授.
通讯作者: 于锦辉,huijinyu098@tju.edu.cn.
更新日期/Last Update: 2017-09-27