Design of Cooled LWIR Refractive/diffractive Athermal Telephoto Objective

doi:10.3969/j.issn.1000-1093.2014.05.011

Abstract

Abstract: According to the overall design requirement of tank infrared observing-aiming system, a cooled LWIR refractive/diffractive athermal telephoto objective is designed in order to meet the requirements of infrared target detection in battlefield environments. The telephoto objective is composed of objective and relay lens. The focal length is -200 mm, the F number is 2.1, and the full field of view is 3.6°. The detector is the MARS-VLW LWIR focal plane array produced by Sofradir Company. Its resolution is 320× 256 pixels, and the pixel size is 30 μm×30 μm. The image quality of this telephoto objective is excellent. In the temperature range of -40 ℃~60 ℃, MTF of each field of view is about 0.5 at the cutoff frequency of 17 cy/mm, the root mean square radius of spot diagram for each field of view is much smaller than the Airy spot radius (34.5 μm). The cold-shield efficiency is 100%. This infrared telephoto objective can be used for other infrared observing-aiming system.

Key words: ordnance science and technology, optical design, telephoto objective, athermalization, refractive/diffractive hybrid, target detection

CLC Number:

TN21

ZHANG Yu, WANG Wen-sheng. Design of Cooled LWIR Refractive/diffractive Athermal Telephoto Objective[J]. Acta Armamentarii, 2014, 35(5): 648-653.

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