光子学报, 2014, 43 (11): 1112001, 网络出版: 2014-12-08   

一种相位调制激光多普勒频移测量方法

A Kind of Phase Modulation Laser Doppler Shift Measuring Method
作者单位
哈尔滨工业大学 可调谐激光技术国家级重点实验室, 哈尔滨 150080
摘要
对相位调制拍频信号随信号光频率变化规律进行分析, 发现拍频信号相位参量的频谱包含两个在值域上彼此分开的单调边缘, 表明利用拍频信号的相位参量可以进行多普勒频移测量.如果利用拍频信号振幅参量对出射激光进行工作点锁定, 其多普勒频移测量范围是Fabry-Perot干涉仪边缘技术的两倍.理论分析拍频信号振幅和相位参量的提取方法, 表明基于此拍频信号相位参量的测量方法无需进行信号光能量检测, 与Fabry-Perot边缘技术方法相比, 结构更简单, 且少了一条外部噪音混入的通道.为了对该多普勒频移测量方法定量分析和参量优化, 利用误差合成原理以及计算机仿真, 推导出其测量误差公式.根据测量原理搭建了实验系统, 用频率可调光纤激光器的输出光模拟多普勒频移信号光进行测量, 结果表明鉴频参量及其误差分布曲线的测量结果与理论分析相符合.
Abstract
The change rule of phase-modulation beat-frequency-signal following signal light frequency was analyzed theoretically. It is found that the frequency spectrum of phase-modulation beat-frequency-signal phase is composed of two monotone edges separated from each other in domain. The results indicate that the beat-frequency-signal phase can be used to measure Doppler shift, and its Doppler shift measurement range is two times of Fabry-Perot interferometer edge technique if outgoing laser work-point is locked using beat-frequency-signal amplitude. Theoretical analysis of beat-frequency-signal amplitude and phase extraction methods shows that the measurement method based on beat-frequency-signal phase does not need signal light energy detection, and has simpler structure and less one outside noise entering channel than Fabry-Perot interferometer edge technique. For quantitative research and parameters optimization of this Doppler shift measurement method, its measurement error formula was deduced by using the error combination principle and computer simulation. The experimental system is set up based on the measurement principle. The output light of frequency tunable fiber laser simulates Doppler frequency shift signal light to be measured. The measurement results of frequency-discrimination parameter and its error distribution curves are agreed with the theoretical results well.

曲彦臣, 杜军, 赵卫疆, 耿利杰, 刘闯, 张瑞亮, 陈振雷. 一种相位调制激光多普勒频移测量方法[J]. 光子学报, 2014, 43(11): 1112001. QU Yan-chen, DU Jun, ZHAO Wei-jiang, GENG Li-jie, LIU Chuang, ZHANG Rui-liang, CHEN Zhen-lei. A Kind of Phase Modulation Laser Doppler Shift Measuring Method[J]. ACTA PHOTONICA SINICA, 2014, 43(11): 1112001.

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