Model MTF for the mosaic window. Issue 19 (28th October 2017)

• Record Type: Journal Article
• Authors: Xing, Zhenchong; Hong, Yongfeng; Zhang, Bao
• Is Part Of: Journal of modern optics. Volume 64:Issue 19(2017)
• Page Start: 2074
• Page End: 2082
• Publication Date: 2017-10-28
• Subjects: Imaging systems -- optical window -- modulation transfer function -- diffractive optics; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2017.1337940
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract: An electro-optical targeting system mounted either within an airframe or housed in separate pods requires a window to form an environmental barrier to the outside world. In current practice, such windows usually use a mosaic or segmented window. When scanning the target, internally gimbaled systems sweep over the window, which can affect the modulation transfer function (MTF) due to wave-front division and optical path differences arising from the thickness/wedge differences between panes. In this paper, a mathematical model of the MTF of the mosaic window is presented that allows an analysis of influencing factors; we show how the model may be integrated into ZEMAX® software for optical design. The model can be used to guide both the design and the tolerance analysis of optical systems that employ a mosaic window.