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

Joseph A. Magner; Tammy D. Henson

doi:10.1117/12.319379

26 August 1998 Optical fabrication and metrology for a visible-through-thermal infrared multiband imaging system

Joseph A. Magner, Tammy D. Henson

Proceedings Volume 3377, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IX; (1998) https://doi.org/10.1117/12.319379
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

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.

Citation Download Citation

Joseph A. Magner and Tammy D. Henson "Optical fabrication and metrology for a visible-through-thermal infrared multiband imaging system", Proc. SPIE 3377, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IX, (26 August 1998); https://doi.org/10.1117/12.319379

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available