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以前已报道过许多用声-光器件进行信号相关的技术。本文评论了这些技术并讨论在为一定应用选择特定结构时的折衷设计。在结构上主要有两种类型。一种是空间积分相关器,它是将同时存在于声器件中的信号(s)的全部衍射光积分而进行相关的。这种相关器有大的窗口,但时间带宽积受到器件参数的限制。另一种是时间积分相关器,它用探测器阵列对声光池中的各点进行时间积分。这样可用有限的窗口,但有大的时间带宽积。本文给出了采用这两种系统所获得的实验结果及制成的装置图片,还总结了声-光器件参数以便与互相竞争的技术进行比较。
A number of signal-related techniques have been reported previously using acousto-optic devices. This article reviews these techniques and discusses the trade-offs in choosing a particular structure for a given application. There are basically two types of structures. One is the spatial integral correlator, which correlates all the diffracted light of the signal (s) present in the acoustic device. This correlator has a large window, but the time-bandwidth product is limited by the device parameters. The other is the time integral correlator, which uses the detector array to time-integrate points in the acousto-optic pool. This works with a limited window but with a large time bandwidth product. This article presents the experimental results obtained with these two systems and the resulting device picture. It also summarizes the parameters of the acousto-optic device to compare with competing technologies.