声光偏转多频信号同时探测互调现象研究

李小纳; 何宁; 邓德迎

doi:doi:10.3788/aos20103009.2504

光学学报, 2010, 30 (9): 2504, 网络出版: 2014-05-15

声光偏转多频信号同时探测互调现象研究

Research on Phenomenon of Intermodulation in Detection of MultiFrequency Signals Based on AcoustoOptic Deflection

论文大纲

李小纳 ^*何宁邓德迎

作者单位

桂林电子科技大学信息与通信学院, 广西桂林 541004

衍射光栅多频互调线性驱动带宽 diffraction grating multifrequency intermodulation linear drive bandwidth

摘要

声光偏转效应可用于信号载频相关信息的测量。但当多个射频信号同时加载到声光偏转器时，在布拉格条件下信号间将发生互调现象，给信号检测带来很大的困难，尤其是三阶互调光束的干扰尤为严重。针对这种声光衍射产生的互调干扰，从声光衍射互作用原理出发，讨论了产生互调现象的条件、衍射分布和信号频谱图。通过理论分析，提出了减小互调现象的方法和措施。构建测试系统平台,对多路信号同时到达声光偏转器时产生互调干扰的程度进行了实验验证。在声光偏转器有效带宽内,衍射效率一定的情况下，通过适当控制射频驱动功率，保证声光偏转器工作在线性区域，可有效地减小互调干扰，从而有利于系统的信号检测。

Abstract

The measurements of the information on the carrier frequency can be realized by the acoustooptic deflection effects. However, when the multiradio frequency signals are simultaneously input to the acoustooptic deflector, the intermodulation between the signals will be generated in the Bragg regime. It causes great difficulties to signal detecting, especially interference from the thirdorder intermodulation is particularly serious. In response to the intermodulation interference coming from the acoustooptic diffraction, the conditions of generating intermodulation, diffraction distribution, and frequency spectrum are discussed on the basis of the principle of the interaction of the acoustooptic diffraction. Through theoretical analysis, the methods and measures by which the phenomenon of the intermodulation can be reduced are proposed. In order to verify the degree of intermodulation interference in the detection of multifrequency signals, a test system is constructed. By way of experimental analysis, the conclusion that the intermodulation interferences can be reduced effectively by controlling drive power of radio frequency (RF) properly to ensure that acoustooptic deflector works in linear regions is drawn, when diffraction efficiency in the effective bandwidth of acoustooptic deflector is fixed.

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李小纳, 何宁, 邓德迎. 声光偏转多频信号同时探测互调现象研究[J]. 光学学报, 2010, 30(9): 2504. Li Xiaona, He Ning, Deng Deying. Research on Phenomenon of Intermodulation in Detection of MultiFrequency Signals Based on AcoustoOptic Deflection[J]. Acta Optica Sinica, 2010, 30(9): 2504.

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