Calculating model for equivalent thermal defocus amount in infrared imaging system

Infrared Physics & Technology

Chang

et al. 2017

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Section: Extension Of Focal Depthmentioning

confidence: 99%

“…Therefore, the motorized linear stage is moved at a step of 5 lm for capturing in-focus infrared images. In-focus images have shape edges, so the defocus infrared images are evaluated by the following expression [13],…”

Section: Comparison Between Decoded Infrared Images and In-focus Infrmentioning

confidence: 99%

110 °C range athermalization of wavefront coding infrared imaging systems

Infrared Physics & Technology

Chang

et al. 2017

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“…Our previous works proposed an analytical model for effect of temperature variation in wavefront coding infrared imaging system [3] and a calculating model for equivalent thermal defocus amount in an infrared imaging system [4] . We further developed wavefront coding athermalized infrared imaging systems with a narrow-medium FoV [1,5] .…”

Section: Introductionmentioning

confidence: 99%

A Wide-FoV Athermalized Infrared Imaging System with a Two-Piece Lens

Zhao

et al. 2017

Preprint

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For a wide field of view (FoV) wavefront coding athermalized infrared imaging system with a single decoding kernel, the off-axis aberration tends to cause artefacts. In order to correct offaxis aberration, many pieces of lenses will reduce the transmission efficiency and increase the weight and cost. To meet requirements for wide FoV, wide operating temperature and low weight of infrared imaging systems, this paper reports a wide-FoV wavefront coding athermalized infrared imaging system with a two-piece lens. Its principle, design, manufacture, measurement and performance validation are successively discussed. This paper constructs an optimization problem which maximizes the weighted mean of PSF consistency for both the FoV and operating temperature range. The two-piece lens contains four surfaces, where three aspheric surfaces are introduced to reduce optical off-axis aberrations and a cubic surface is introduced to achieve athermalization. The optical phase mask containing an aspheric surface and a cubic surface is manufactured by nano-metric machining of ion implanted material(NiIM). Experimental results validate that our wide-FoV wavefront coding athermalized infrared imaging system has a full FoV of 26.10° and an operating temperature over -20°C to +70°C.

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“…However, the thermal defocus aberration caused by the environmental temperature seriously affects the performance of an infrared imaging system [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Our previous research proposed a calculating model for equivalent thermal defocus amount in infrared imaging systems [2] and proposed an analytical model for the effect of temperature variation in wavefront coding infrared imaging systems [9]. For further developing a wavefront infrared imaging system, the material of an optical phase mask should be considered first.…”

Section: Introductionmentioning

confidence: 99%

ZnSe-material phase mask applied to athermalization of infrared imaging systems

et al. 2016

Appl. Opt.

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