混合光学-数字相关器的实验系统实现

Experimental systems implementation of a hybrid optical-digital correlator.

作者信息

Sharp J H, MacKay N E, Tang P C, Watson I A, Scott B F, Budgett D M, Chatwin C R, Young R C, Tonda S, Huignard J P, Slack T G, Collings N, Pourzand A R, Duelli M, Grattarola A, Braccini C

机构信息

Department of Mechanical Engineering, Laser and Optical Systems Engineering Centre, University of Glasgow, UK.

出版信息

Appl Opt. 1999 Oct 10;38(29):6116-28. doi: 10.1364/ao.38.006116.

DOI:10.1364/ao.38.006116

PMID:18324134

Abstract

A high-speed hybrid optical-digital correlator system was designed, constructed, modeled, and demonstrated experimentally. This correlator is capable of operation at approximately 3000 correlations/s. The input scene is digitized at a resolution of 512 x 512 pixels and the phase information of the two-dimensional fast Fourier transform calculated and displayed in the correlator filter plane at normal video frame rates. High-fidelity reference template images are stored in a phase-conjugating optical memory placed at the nominal input plane of the correlator and reconstructed with a high-speed acousto-optic scanner; this allows for cross correlation of the entire reference data set with the input scene within one frame period. A high-speed CCD camera is used to capture the correlation-plane image, and rapid correlation-plane processing is achieved with a parallel processing architecture.

摘要

设计、构建、建模并通过实验演示了一种高速混合光学 - 数字相关器系统。该相关器能够以大约每秒3000次相关运算的速度运行。输入场景以512×512像素的分辨率进行数字化处理，二维快速傅里叶变换的相位信息在相关器滤波器平面以正常视频帧率进行计算和显示。高保真参考模板图像存储在置于相关器标称输入平面的相位共轭光学存储器中，并通过高速声光扫描仪进行重建；这使得整个参考数据集能够在一帧周期内与输入场景进行互相关。使用高速电荷耦合器件（CCD）相机捕获相关平面图像，并通过并行处理架构实现快速的相关平面处理。