A middle infrared dual Field-of-View (FOV) optical system with staring focal plane array and reimaging optics is presented for cool 640×512 detector. Based on zoom system principle and optical design software the Modulation Transfer Function (MTF) curve spot diagram and the encircled energy are investigated. The design results show that this system can realize 300mm/600mm dual field-of-view at the spectrum region of 3.7~4.8um and the F number of four, which can obtain the cold shield efficiency of 100% and the MTF more than 0.2 at the spatial frequency of 33lp/mm. The optical system is analyzed in two modes of long focal length and short focal length, and results show that it has the advantages of simple structure, high image quality, low price and easy to adjustment.
Wavefront coding is a technology which combination of the optical design and digital image processing. By inserting a phase mask closed to the pupil plane of the continuous zoom optical system, the wavefront of the system is re-modulated. And the depth of focus is extended consequently. In reality the idea is same as the athermalization theory of infrared optical system. In this paper, an uncooled infrared continuous zoom optical system with effective focal as 38mm~19mm, F number as 1.2, operating wavelength varying from 8μm to 12μm was designed. A cubic phase mask was used at the pupil plane to re-modulate the wavefront. Then the performance of the infrared continuous zoom system was simulated with CODEV as the environment temperature varying from -40℃ to 60℃. MTF curve of the optical system with phase mask are compared with the traditional before using phase mask. Decode the image of the coding system, and the result show that wavefront coding technology can make the system not sensitive to thermal defocus, and then realize the athermal design of the infrared optical system.
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