基于双DMD的红外场景投影仪的结构设计及有限元分析

Mechanism Design and Finite Element Analysis for Infrared Scene Projector Based on Dual-DMD

摘要: 红外场景投影仪能够模拟多种类型的目标与背景，对光电探测系统进行动态测试评估。为提高中波红外场景投影仪帧频速度和灰度等级，提出了一种基于双DMD (数字微反射器件)的设计方案。根据光学系统的特点及中波红外投影仪使用环境，对总体结构进行选型。根据投影仪的使用环境要求，对其进行有限元分析，结论表明力学性能满足指标要求。投影仪的测试结果表明此系统完全满足指标要求。

Abstract: Infrared scene projector can simulate multiple types of targets and backgrounds, which can evaluate dynamic test of photoelectric detection systems. In order to improve the frame rate and the grey level of the midwave (MWIR) scene projector, the design scheme based on dual-DMD (Digital micro-mirror device) is presented. The overall structure is selected according to the characteristic of optical system and operational environment of the midwave (MWIR) scene projector. The finite element analysis of the system is carried out according to operating environment requirements, which results show that the mechanical properties meet the specification. The results of the testing for the projector illustrate that the performances of the optical systems meet the specifications of the infrared scene projector.