Infrared dual-band optical engine based on dual dmd

Abstract

The invention provides an infrared dual-band optical engine based on dual DMDs, including a projection optical system, a first DMD for modulating incident infrared long-wave light into infrared long-wave image light, and a first DMD for modulating incident infrared mid-wave light into The second DMD for infrared mid-wave image light, the first and second illumination optical systems respectively located on both sides of the optical axis of the projection optical system and illuminating the first and second DMD target surfaces with infrared long-wave and medium-wave light respectively. The dual-illumination optical system of the present invention directly illuminates the two DMD target surfaces with Koehler telecentric optical paths of different infrared bands, adopts a three-dimensional spatial layout to avoid interference between different optical paths, and effectively improves energy utilization; the projection optical system is completed by introducing two aspherical surfaces The dual-band chromatic aberration correction of infrared mid-wave and long-wave has been realized, and the front afocal design has been realized. The optical engine can not only project the infrared dual-band simulation scene, but also simulate the difference in energy distribution of different infrared bands in the scene on the image plane.

Description

technical field [0001] The invention relates to the field of infrared dynamic scene simulation, in particular to an infrared dual-band optical engine based on dual DMDs. Background technique [0002] Infrared dual-band scene simulators, such as infrared medium / long-wave scene simulators, as performance testing and evaluation equipment for infrared dual-band imaging systems, can generate simulated scenes in their working bands that are consistent with the radiation characteristics of real infrared dynamic scenes. During the test, the projection optical system in its optical engine parallel-projects the infrared image light with radiation information to the entrance pupil of the infrared dual-band imaging system to be tested to simulate far-field radiation. Therefore, the performance of the optical engine It directly affects the simulation ability of the infrared dual-band scene simulator to the infrared dynamic scene. [0003] At present, the optical engine of the infrared m...

AI Technical Summary

Problems solved by technology

[0003] At present, the optical engine of the infrared medium / long-wave scene simulator is usually designed based on a single DMD. It is suitable for projecting infrared mid-wave and long-wave simulation scenes, but it cannot be used to simulate the energy distribution difference of different infrared bands on the image plane in this scene. Therefore, the optical engine of the existing infrared mid- / long-wave scene simulator can only meet the working band requirements of the infrared dual-band imaging system, and cannot test its anti-interference performance, which limits the scope of use

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