基于笼式结构的θ调制空间假彩色编码教具设计

Teaching Aid Design of θ Modulation Space Pseudo-color Encoding on Cage Structure

空间频率域滤波是《信息光学》课程教学重点和难点。目前,未见国内有适合课堂教学的教具设计的报道。本文主要介绍基于笼式结构的空间频率域滤波设计,以白光源θ调制空间假彩色编码实验为例,采用单透镜实现傅里叶变换和成像,达到简化系统的目的。利用标量场衍射理论,推导单透镜空间滤波系统的基本原理,然后给出数值仿真和实验效果图。实验结果表明该系统能够较好的演示光栅频谱及空间滤波特性。该系统具有结构紧凑,体积小,重量轻,携带方便,成本低,演示效果好等特点。

Spatial frequency filteringis the key and difficult part in the teaching of Information Optics.At present,there are no domestic reports on the design of teaching aids.This paper mainly introduces the design of spatial frequency domain filter based on cage structure.θmodulation space pseudo-color encoding with white light source is taken as a demonstration,and the optical schematic is simplified with a converging lens to perform both Fourier transform and imaging.The basic principle of spatial filtering system with single thin lens is deduced by the scalar diffraction theory,and then the numerical simulation results and experimental diagrams are given.Results show that the system can demonstrate the grating spectrum and spatial filter processing characteristics.The design can be broadly used with the following advantages:compact and simple structure,low cost components,light weight,easy portability,good performance,etc.