| 双平衡式探测在激光测速仪中的应用研究 |
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| 引用本文： | 李玉,张澍,周健,金世龙.双平衡式探测在激光测速仪中的应用研究[J].强激光与粒子束,2016,28(10):101004. |
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| 作者姓名： | 李玉 张澍 周健 金世龙 |
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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 41 0073; |
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| 摘 要： | 为了增大激光多普勒测速仪的测量距离，设计了基于马赫-曾德尔环形结构的双平衡式探测接收系统来提高灵敏度。基于平衡探测光电流的表达式，推导了平衡探测系统信噪比的表达式并对相关因素进行仿真实验。仿真结果表明:在相同光信号输入条件下，当两个探测器的量子效率比值在(0.236,1)之间时，平衡探测系统的信噪比高于普通相干探测系统的信噪比，并且当探测器量子效率相等时，信噪比最大。最后通过实验验证量子系数的比值对信噪比的影响。,
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| 关 键 词： | 平衡探测 数值仿真 探测器 信噪比 |
| 收稿时间： | 2016-01-10 |
Application of dual-balanced detection in laser velocimeter |
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| Institution: | 1.College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,China;2.No.91404 Troop of PLA,Qinhuangdao 066000,China |
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| Abstract: | To increase the measurement distance and sensitivity of laser Doppler velocimeter, the dual-balanced detection receiving system was designed based on Mach-Zehnder ring structure. The SNR expression of balanced detection system based on the balanced light current is derived and simulated. The simulation shows that the SNR of balanced detection is higher than that of the heterodyne detection when quantum conversion efficiency ratio of two detectors ranges from 0.236 to 1, and the signal-to-noise ratio is the highest when the ratio is 1. The simulation results were demonstrated by experiments. |
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