| 不同速度下散斑图样对多普勒测速的影响 |
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| 引用本文： | 吕亮,桂华侨,谢建平,赵天鹏,许军,何德勇,黄伟,明海. 不同速度下散斑图样对多普勒测速的影响[J]. 中国科学技术大学学报, 2005, 35(5): 589-594 |
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| 作者姓名： | 吕亮 桂华侨 谢建平 赵天鹏 许军 何德勇 黄伟 明海 |
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| 作者单位： | 中国科学技术大学物理系,安徽,合肥,230026 |
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| 摘 要： | 对不同速度下散斑在多普勒测速计中的影响进行了理论分析,并与实验结果进行了比较.结果发现多普勒频率的展宽与其中心频率的比值在32.2～379.6 mm·s-1的速度范围内约为30%,其中散斑是影响频率展宽的主要因素.因此速度测量中散斑所引起误差是难以忍受的,必须尽量消除散斑对测量的不利影响.采用锁相环可以消除这种不利的影响.
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| 关 键 词： | 多普勒测速仪 散斑 干涉仪 |
| 文章编号： | 0253-2778（2005）05-0589-06 |
| 收稿时间： | 2004-08-26 |
| 修稿时间： | 2005-02-26 |
Effect of Speckle Pattern on Laser Doppler Velocimeters at Different Velocities |
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| LV Liang,GUI Hua-qiao,XIE Jian-ping,ZHAO Tian-peng,XU Jun,HE De-yong,HUANG Wei,MING Hai. Effect of Speckle Pattern on Laser Doppler Velocimeters at Different Velocities[J]. Journal of University of Science and Technology of China, 2005, 35(5): 589-594 |
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| Authors: | LV Liang GUI Hua-qiao XIE Jian-ping ZHAO Tian-peng XU Jun HE De-yong HUANG Wei MING Hai |
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| Abstract: | A theoretical analysis for speckle effect and comparisons withexperi mental results on laser Doppler veloci meters at different velocities arepresented.It is found that the value of ratio between frequency broadening andcenter frequencyis about 30 %from81.8 mm.s-1to 379.6 mm.s-1and that theeffect of speckle patternis one of the main reasons.The error caused by the effectof speckle pattern is an intolerant value in velocity measurements which need beeli minated.And this bad effect can be eli minated by employing the PLL method. |
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| Keywords: | Laser Doppler velocimeters Speckle Interferometers |
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