HYPERSPECTRAL IMAGING SPECTROMETER WITH A NOVEL ZOOMING FUNCTION

  • Choi Jin (Department of physics and Image Information Research Center, Korea Advanced Institute of Science and Technology) ;
  • Kim Tae Hyung (Department of physics and Image Information Research Center, Korea Advanced Institute of Science and Technology) ;
  • Kong Hong Jin (Department of physics and Image Information Research Center, Korea Advanced Institute of Science and Technology) ;
  • Lee Jong-Ung (Department of Optical Engineering, Chongju Universiy)
  • Published : 2005.10.01

Abstract

A novel hyperspectral imaging spectrometer controlling spatial and spectral resolution individually has been proposed. This imaging spectrometer uses a zoom lens as a telescope and a focusing element. It can change the spatial resolution fixing the spectral resolution or the spectral resolution fixing the spatial resolution. Here, we report the concept of the hyperspectral imaging spectrometer with the novel zooming function and the optical design of a zoom lens as the focusing element. By using lens module and third-order aberration theory, we have presented the initial design of four-group zoom lens with external entrance pupil. And the optimized zoom lens with a focal length of 50 to 150 mm is obtained from the initial design by the optical design software. As a result, the designed zoom lens shows satisfactory performances in wavelength range of 450 to 900 nm as a focusing element in an imaging spectrometer. Furthermore, the collimator lens of the imaging spectrometer is designed through the third-order aberration correction by using an iterative process.

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