Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Modulation Transfer Function System for a Mid-infrared Lens by Knife-edge Scanning Technique

칼날 주사방식을 이용한 중적외선 렌즈의 변조전달함수 측정 장치

  • Song, Se-Yong (Department of Applied Optics and Electromagnetics, Hannam University) ;
  • Jo, Jae-Heung (Department of Applied Optics and Electromagnetics, Hannam University) ;
  • Hong, Sung-Mok (Center for Space Optics, Korea Research Institute of Standards and Science) ;
  • Lee, Hoi-Youn (Center for Space Optics, Korea Research Institute of Standards and Science) ;
  • Lee, Yun-Woo (Center for Space Optics, Korea Research Institute of Standards and Science)
  • 송세용 (한남대학교 광.전자물리학과) ;
  • 조재흥 (한남대학교 광.전자물리학과) ;
  • 홍성목 (한국표준과학연구원 우주광학센터) ;
  • 이회윤 (한국표준과학연구원 우주광학센터) ;
  • 이윤우 (한국표준과학연구원 우주광학센터)
  • Received : 2011.01.13
  • Accepted : 2011.02.16
  • Published : 2011.02.25
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Abstract

We fabricate a measuring system to measure the modulation transfer function (MTF) of a mid-infrared imaging silicon lens by using the knife-edge scanning technique. In particular, we measure on-axial tangential MTF of the silicon lens with the focal length of 50 mm and F-number F/4 in the wavelength band of mid-infrared between $3\;{\mu}m$ and $5\;{\mu}m$. In order to obtain the infinite object, the off-axial parabolic reflector with the focal length of 2.545 m is utilized. In the comparison with measured MTF data and designed MTF values curve, we find that the tolerance of measured MTF data below the spatial frequency of 7 lp/mm is within 2%.

중적외선 결상용 실리콘 렌즈의 변조전달함수(MTF)를 칼날 주사방식으로 측정하는 적외선 MTF 측정장치를 구성하였다. 이를 위하여 반달형 칼날 물체를 사용하여 초점거리 50 mm, F/4인 실리콘 렌즈에 대한 중적외선 파장대인 $3{\sim}5\;{\mu}m$에서의 축상 자오 방향에 대한 MTF를 측정하였다. 이 때 무한 물체를 만들기 위해서 초점거리가 2.545 m인 비축 포물 반사경을 사용하였다. 측정한 MTF는 렌즈의 설계 자료로부터 구한 MTF와 비교한 결과, 7 lp/mm 이하에서 2 % 이내의 MTF 허용오차를 만족하고 있음을 알 수 있었다.

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References

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