解调
相位调制
调制(音乐)
谐波
相(物质)
光学
信号(编程语言)
总谐波失真
贝塞尔函数
失真(音乐)
算法
干涉测量
调幅
振幅
物理
计算机科学
数学
频率调制
声学
相位噪声
电信
放大器
频道(广播)
带宽(计算)
量子力学
程序设计语言
功率(物理)
作者
Wen Zhou,Benli Yu,Jihao Zhang,Jinhui Shi,Dong Guang,Cheng Zuo,Shengquan Mu,Yangzhou Liu,Lin Zhang,Xuqiang Wu
出处
期刊:Optics Express
[The Optical Society]
日期:2023-02-13
卷期号:31 (5): 7175-7175
被引量:4
摘要
For the optical fiber sensing system using phase generated carrier (PGC) technology, it is very important to eliminate the nonlinear effect of phase modulation depth (C) fluctuation on the demodulation results in the actual environment. In this paper, an ameliorated phase generated carrier demodulation technique is presented to calculate the C value and suppress its nonlinear influence on the demodulation results. The value of C is calculated out by the fundamental and third harmonic components with the equation fitted by the orthogonal distance regression algorithm. Then the Bessel recursive formula is used to convert the coefficients of each order of Bessel function contained in demodulation result into C values. Finally, the coefficients in demodulation result are removed by the calculated C values. In the experiment, when the C ranges from 1.0 rad to 3.5 rad, the minimum total harmonic distortion and maximum phase amplitude fluctuation of the ameliorated algorithm are 0.09% and 3.58%, which are far superior to the demodulation results of the traditional arctangent algorithm. The experimental results demonstrate that the proposed method can effectively eliminate the error caused by the fluctuation of the C value, which provides a reference for signal processing in practical applications of fiber-optic interferometric sensors.
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