| 激光多普勒移频特性研究 |
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| 引用本文： | 曹康,姜成昊,朱精果,杜鹃,乔治,叶征宇.激光多普勒移频特性研究[J].红外与激光工程,2021,50(11):20210116-1-20210116-8. |
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| 作者姓名： | 曹康 姜成昊 朱精果 杜鹃 乔治 叶征宇 |
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| 作者单位： | 1.中国科学院微电子研究所，北京 100029 |
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| 基金项目： | 国家重点研发计划（2017YFC0803400） |
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| 摘 要： | 为了提高激光多普勒测速系统的性能，增强系统与应用场景适配性，文中对比电光和声光两种主要移频器件的特点，从器件移频原理出发，提出了简化频率变换关系的分析方法，从理论上研究激光多普勒测速系统中两种器件产生的移频特性，搭建铌酸锂电光调制和声光移频全光纤激光测速系统链路，将测试频率特征与理论特征进行对比研究，提出一种新型声电混合调制激光多普勒测速系统。结果表明，该新型系统兼具声光移频测速系统可测量运动目标运动方向、运动速度，完成电光调制测速系统多频率校正的特点，频率测量相对误差较小，动态范围大。通过研究两种移频方式对频率特性，为设计高性能激光多普勒测速系统提供了理论和实验支撑。
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| 关 键 词： | 激光多普勒测速 电光频移 声光移频 移频特性 声电混合调制 |
| 收稿时间： | 2021-02-24 |
Frequency shift characteristics of laser Doppler effect |
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| Cao Kang,Jiang Chenghao,Zhu Jingguo,Du Juan,Qiao Zhi,Ye Zhengyu.Frequency shift characteristics of laser Doppler effect[J].Infrared and Laser Engineering,2021,50(11):20210116-1-20210116-8. |
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| Authors: | Cao Kang Jiang Chenghao Zhu Jingguo Du Juan Qiao Zhi Ye Zhengyu |
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| Affiliation: | 1.Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, China2.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In order to improve the performance of the laser Doppler velocimetry system and enhance the adaptability of the system to application scenarios, the characteristics of the two main frequency shift devices of electro-optic and acousto-optic were compared. Starting from the principle of frequency shifting of devices, a simplified method of analyzing frequency transformation relations was proposed. The frequency shift characteristics of the two devices in the laser Doppler velocimetry system was theoretically studied, all-fiber laser velocimetry system link of a lithium niobate electro-optic modulation and acousto-optic frequency shift were bulit. The test frequency characteristics and the theoretical characteristics was compared. A new type of acousto-electric hybrid modulation laser Doppler velocity measurement system was proposed. The results show that the new system has the advantages that the acousto-optic frequency shift speed measurement system can measure the movement direction and speed of the moving target, and accomplish the multi-frequency correction of electro-optic modulation speed measurement system, the relative error of frequency measurement is small, and the dynamic range is large. By studying the frequency characteristics of the two frequency shifting methods, it provides theoretical and experimental support for the design of high-performance laser Doppler velocity measurement systems. |
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