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1. chinaXiv:201711.02787 [pdf]

光源混合频率调制的光热干涉工作点无源控制方法研究

李树旺
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等

相位漂移现象是干涉测量中普遍存在的问题,对解调结果的准确度带来巨大影响。提出了一种光源混合频率调制的闭环工作点无源控制方法,通过直接高频调制光源的方式从单路干涉信号中提取出相位漂移信号,并利用低频控制信号对光源直接调制的方式予以补偿;通过高频、低频调制信号的配合,解决了单路干涉信号的工作点跟踪问题,以无源控制的方式保证干涉测量系统始终工作在最灵敏的线性区域。测试了光源在不同调制频率下的调制特性,比较了系统开、闭环状态下工作点的变化趋势,无源闭环工作点控制法与相位载波解调算法的对比解调结果表明两种方法解调结果相关度超过 ,证明该方法可行。

提交时间: 2017-11-29 点击量104下载量62 评论 0

2. chinaXiv:201711.02788 [pdf]

Analysis and mitigation of the carrier phase delay effect of the digital phase generated carrier algorithm

邵士勇
分类: 物理学 >> 普通物理:统计和量子力学,量子信息等

We present an improved digital phase generated carrier (PGC)algorithm based on the synchronous carrier restoration(SCR) method to mitigate the carrier phase delay effects. The most distinguishing feature of this method is that it picks up the carrier signal information (frequency and phase) from the interference signal directly and accomplishes the processing of carrier signal restoration synchronically. In comparison with the traditional one which adopts the initial carrier signal, the total-harmonic-distortions of the SCR method is only 0.091%, lower than the traditional one's 18.38%, and the signal-to-noise-ratio increases 29 dB. Further, we derive the analytic expression of distortion component and verify it by experiments. Thistechnique may be potentially applied in a long distance large-scale distributed fiber-optic interferometer sensors array.

提交时间: 2017-11-29 点击量95下载量48 评论 0

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