Method of dynamic range expansion at acousto-optic analysis of radio-signal spectra

D. Belyaev, V. N. Parygin, V. Balakshy
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Abstract

Acousto-optic (AO) interaction for a case when an acoustic signal contains three frequency components is theoretically and experimentally investigated. An existence of combinative frequencies at the multifrequency AO interaction is proved. A spatial distribution of transmitted and diffracted light intensities is demonstrated in approximation of three-step scattering process. The functioning of an AO spectrum analyzer is illustrated by an example of the three-frequency AO interaction. A new method for the expansion of the analyzer dynamic range is suggested. The efficiency of the method is experimentally confirmed.
无线电信号光谱声光分析中动态范围扩展方法
从理论上和实验上研究了声信号包含三个频率分量时的声光相互作用。证明了多频AO相互作用下组合频率的存在性。透射光强和衍射光强的空间分布近似于三步散射过程。通过一个三频AO相互作用的例子说明了AO频谱分析仪的功能。提出了一种扩大分析仪动态范围的新方法。实验验证了该方法的有效性。
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