| 激光多普勒测速仪信噪比及多普勒电流的研究 |
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| 引用本文： | 周健,冯庆奇,龙兴武,魏国,宋锐.激光多普勒测速仪信噪比及多普勒电流的研究[J].光电工程,2009,36(6). |
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| 作者姓名： | 周健 冯庆奇 龙兴武 魏国 宋锐 |
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| 作者单位： | 1. 国防科学技术大学,光电科学与工程学院,长沙,410073
2. 中国酒泉卫星发射中心,甘肃,酒泉,732750 |
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| 摘 要： | 研究并给出了参考光束型激光多普勒测速仪中计算信噪比的一般公式,并进行数值模拟,分析了光斑尺寸和探测器孔径对信噪比的影响;同时给出多普勒电流的计算公式,并从理论上分析了参考光束与信号光束的空间位置关系对多普勒电流的影响.理论分析及数值模拟表明,信噪比是参考光光强的增函数,但当参考光光强达到一定值时,信噪比增加的非常缓慢,趋近极限值ηIs/(hv△f);两光束艾里斑尺寸相当时,信噪比最大,可达0.7ηPs/(hv△f).两束光不平行时,多普勒电流的大小与两束光的角度偏差关系很大;而两光束平行时,光束入射角对多普勒电流几乎没有影响.
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| 关 键 词： | 激光多普勒测速仪 信噪比 多普勒电流 角度偏差 |
Signal-to-noise Ratio and Doppler Current of Laser Doppler Velocimeter |
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| ZHOU Jian,FENG Qing-qi,LONG Xiag-wu,WEI Guo,SONG Rui.Signal-to-noise Ratio and Doppler Current of Laser Doppler Velocimeter[J].Opto-Electronic Engineering,2009,36(6). |
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| Authors: | ZHOU Jian FENG Qing-qi LONG Xiag-wu WEI Guo SONG Rui |
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| Affiliation: | ZHOU Jian1,FENG Qing-qi2,LONG Xing-wu1,WEI Guo1,SONG Rui1 (1.College of Opto-Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China,2.Jiuquan Satellite Launching Center,Jiuquan 732750,Gansu Province,China) |
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| Abstract: | The formula for calculating the signal-to-noise ratio is researched and showed in reference beam Laser Doppler Velocimeter.The effect of light spot size and size of light sensing surface on signal-to-noise ratio is analyzed from numerical simulation.Moreover,the formula of the Doppler current is given while the effect of the positional relation between reference beam and signal beam on Doppler current is analyzed.The theoretical analysis and simulation shows that the signal-to-noise ratio is an increasing f... |
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| Keywords: | laser Doppler velocimeter signal-to-noise ratio Doppler current angle deviation |
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