| 激光多普勒测速仪方向辨别及低速测量的研究 |
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| 引用本文： | 周健,魏国,龙兴武.激光多普勒测速仪方向辨别及低速测量的研究[J].红外与激光工程,2012,41(3):632-638. |
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| 作者姓名： | 周健 魏国 龙兴武 |
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| 作者单位： | 国防科学技术大学光电科学与工程学院,湖南长沙,410073 |
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| 基金项目： | 湖南省研究生科研创新项目(CX2010B053);国防科学技术大学优秀研究生创新资助项目(B100703) |
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| 摘 要： | 为了解决激光多普勒测速仪速度方向辨别及低速测量的问题,利用双声光调制技术设计了光路系统测量转台的转速。在参考光模式的基础上,对参考光和信号光分别进行移频并设定一定的偏置频率,使得探测器输出信号的频率在偏置频率左右变化。理论分析和实验结果表明:双声光调制技术可以有效地辨别速度方向,并且可以实现低速测量;所设计的激光多普勒测速仪的测速精度优于0.35%。
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| 关 键 词： | 激光多普勒测速仪 双声光调制 方向辨别 低速测量 |
Research on direction discrimination and low-speed measurement for laser Doppler velocimeter |
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| Zhou Jian
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Wei Guo
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Long Xingwu.Research on direction discrimination and low-speed measurement for laser Doppler velocimeter[J].Infrared and Laser Engineering,2012,41(3):632-638. |
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| Authors: | Zhou Jian Wei Guo Long Xingwu |
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| Affiliation: | (College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,China) |
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| Abstract: | In order to solve the problem of direction discrimination and low-speed measurement,dual acousto-optic modulation was used in laser Doppler velocimeter(LDV) for measuring the revolution speed of a turntable.Based on reference-beam model,frequencies of reference beam and signal beam were both shifted by the acousto-optic crystals so that frequencies of the output signal changed besides the offset frequency,which was the differential value of the frequencies shift of the two beams.Results of theory analysis and experiments show that direction discrimination and low-speed measurement are available with the effort of dual acousto-optic modulation technology and the measurement accuracy of the designed LDV is better than 0.35%. |
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| Keywords: | laser Doppler velocimeter dual acousto-optic modulation direction discrimination low-speed measurement |
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