Compact mid-wavelength infrared zoom camera with 20:1 zoom range and automatic athermalization

Kim, Hyun Sook; Kim, Chang Woo; Hong, Seok Min

doi:10.1117/1.1481048

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…For example, a four-channel common-aperture total reflection off-axis infrared telescope designed in 2011 by Min Wang et al, National Institute of Optics, Canada, uses an anthermalized optical system 14 . In addition, the microscan continuous zoom medium-wave infrared optical system 15 designed by Hyun Sook Kim et al 2002 is a lightweight and high-performance compact optical system that integrates a variety of technical advantages.…”

Section: The Second Stagementioning

confidence: 99%

Development status of low temperature infrared detection technology

Zhang

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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Section: The Second Stagementioning

confidence: 99%

Development status of low temperature infrared detection technology

Zhang

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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“…All above mentioned are intending to ensure the system has good imaging quality on every focal position. [5][6][7]…”

Section: Parameters and Design Processmentioning

confidence: 99%

Design of a Refractive/Diffractive Hybrid Middle Infrared Continuous Zoom Optical System

Zhao

Xue

et al. 2013

KEM

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The application of diffractive surface in the continuous zoom system is investigated by taking advantage of the negative dispersion characteristics of binary elements. A sample design is presented in this paper using cool 320×240 detector with staring focal plane array and secondary imaging, and a mid-wave optical system using mechanical-compensated with refractive/diffractive hybrid technique is designed. The Pixel Dimensions of the detector is 30μm, and the wavelength between 3.7μm ~4.8μm.The system adopts negative group variable times and positive group of compensation which can realize 18mm～180mm continuous zoom and FOV =36.8°~3.8° , F-number is 2, it consists of 7 lenses including 2 aspheric surface and 1 diffractive surface. The length of this system is 230mm with the reflection mirror to shorten optical path. The results show that the modulation transfer function(MTF) is above 0.6 within the whole focal range at spatial frequency of 17 lp/mm, and Root Mean Square (RMS) value of spot diameter were smaller than the Pixel Dimensions. After the image quality being optimized, the monotonic and smooth cam curve is given and 100% cold shield efficiency is obtained. The curve shows that the imaging plane is stable and the cam is easy to process. The system has advantages of simple structure, high image quality and short zoom path etc.

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“…8 ADD has also developed successfully a compact midwavelength infrared (MWIR) zoom camera with a zoom range 20:1 for the airborne application that is based on a Sofradir's 320ⅹ240 IRFPA in the end of 1990's. [9][10] These systems are now in service with the Korean Army, Navy and Air Force.…”

Section: Introductionmentioning

confidence: 99%

Advanced thermal imaging system for tank sights

Hong

Kim

et al. 2005

SPIE Proceedings

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A new second generation advanced thermal imager, which can be used for battle tank sight has been developed in Korea.The IR optics has dual field of views such as 2.67×2° in NFOV and 10×7.5° in WFOV. This system uses a 480×6 TDI HgCdTe detector, operating in the 8-12µm wavelength, made by Sofradir. In order to correct non-uniformity of detector array, the two point correction method has been developed by using the thermo electric cooler. Additionally, to enhance the image of low contrast and improve the detection capability, the new technique of histogram processing has been proposed. Through these image processing techniques, we obtained the high quality thermal image.

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Compact mid-wavelength infrared zoom camera with 20:1 zoom range and automatic athermalization

Cited by 20 publications

References 9 publications

Development status of low temperature infrared detection technology

Development status of low temperature infrared detection technology

Design of a Refractive/Diffractive Hybrid Middle Infrared Continuous Zoom Optical System

Advanced thermal imaging system for tank sights

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