• Title/Summary/Keyword: aspheric and/or diffractive surface

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Analysis of aspheric and diffractive surface effect for long wavelength infrared lens (장파장 적외선 렌즈의 비구면 및 회절면 효과 분석)

  • 김현수;이동한;김현규;이국환
    • Korean Journal of Optics and Photonics
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    • v.14 no.4
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    • pp.369-376
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    • 2003
  • We analyzed the aspheric and/or diffractive surface effects to the performance in the long wavelength infrared (8-12 $\mu$m). Also we investigated the dependence of the NA values for the fixed effective focal length 100 mm when the field angle was varied from 5 degrees to 30 degrees stepped by 5 degrees. We chose the merit function as a criteria to compare the performance of the different lenses. Based on the analysis of the aspheric and/or diffractive surface effects, we designed the optical system of F/l.0 for the uncooled thermal imaging system. As for detector the pixel size was 45 $\mu$m square and the number of pixels were a 320${\times}$240 pixels.