Optical fabrication and metrology for a visible through thermal infrared multi-band imaging system

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Description

The optical fabrication, metrology, and system wavefront testing of an off-axis three mirror anastigmatic telescope will be presented. The telescope is part of a multi-band imaging system which includes a single mechanically cooled focal plane with 15 spectral bands covering a wavelength range from 0.45 microns to 10.7 microns and an on board calibration subsystem. The imaging system is to be operated in a low earth orbit in a pushbroom scanning mode. The telescope has a 36 cm aperture, a 1.38 degree cross track by 1.82 degree along-track field of view (FOV), near diffraction limited performance in the visible, and ... continued below

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11 p.

Creation Information

Magner, J. & Henson, T. April 1, 1998.

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  • Magner, J. Raytheon Optical Systems, Inc., Danbury, CT (United States)
  • Henson, T. Sandia National Labs., Albuquerque, NM (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The optical fabrication, metrology, and system wavefront testing of an off-axis three mirror anastigmatic telescope will be presented. The telescope is part of a multi-band imaging system which includes a single mechanically cooled focal plane with 15 spectral bands covering a wavelength range from 0.45 microns to 10.7 microns and an on board calibration subsystem. The imaging system is to be operated in a low earth orbit in a pushbroom scanning mode. The telescope has a 36 cm aperture, a 1.38 degree cross track by 1.82 degree along-track field of view (FOV), near diffraction limited performance in the visible, and strictly diffraction limited performance from 1.3 microns to 10.7 microns. The primary and the tertiary mirrors are general aspheres which have undergone 80% lightweighting. The secondary mirror is a hyperbola. The primary mirror was extremely difficult to fabricate and test due to its large departure from sphericity, fast f-number, and large off axis distance. The tertiary mirror has a small departure from sphericity and is only slightly off-axis, but it has a very fast f-number also. The surface wavefront measurements for the three mirrors after final figuring and lightweighting are 0.048 waves rms {at}0.6328 microns for the primary mirror and 0.025 waves rms {at}0.6328 microns for the secondary and tertiary mirrors. The telescope wavefront requirement at the center of the along-track FOV is 0.178 waves rms {at}0.6328 microns and at the edge of the along-track FOV is 0.677 waves rms {at} 0.6328 microns.

Physical Description

11 p.

Notes

OSTI as DE98003383

Source

  • 12. annual international symposium on aerospace/defense sensing, simulation and controls, Orlando, FL (United States), 13-19 Apr 1998

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  • Other: DE98003383
  • Report No.: SAND--97-2312C
  • Report No.: CONF-980412--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 650298
  • Archival Resource Key: ark:/67531/metadc701986

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • April 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • April 14, 2016, 5:57 p.m.

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Magner, J. & Henson, T. Optical fabrication and metrology for a visible through thermal infrared multi-band imaging system, article, April 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc701986/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.