6 August 2009 The research on projective visual system of night vision goggles
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Driven by the need for lightweight night vision goggles with good performance, we apply the projective lens into night vision goggles to act as visual system. A 40-deg FOV projection lens is provided. The useful diameter of the image intensifier is 16mm, and the Resolutions at Center and edge are both 60-lp/mm. The projection lens has a 28mm diameter and 20g weight. The maximum distortion of the system is less than 0.15%. The MTF maintained more than 0.6 at a 60-lp/mm resolution across the FOV. So the lens meets the requirements of the visual system. Besides, two types of projective visual system of night vision goggles are presented: the Direct-view projective visual system and the Seethrough projective visual system. And the See-through projective visual system enables us to observe the object with our eyes directly, without other action, when the environment becomes bright in a sudden. Finally we have reached a conclusion: The projective system has advantages over traditional eyepiece in night vision goggles. It is very useful to minish the volume, lighten the neck supports, and improve the imaging quality. It provides a new idea and concept for visual system design in night vision goggles.
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Shun-long Zhao, "The research on projective visual system of night vision goggles", Proc. SPIE 7384, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, 73841E (6 August 2009); doi: 10.1117/12.835541; https://doi.org/10.1117/12.835541

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