MSTI-3 sensor package optical design

Richard F. Horton; William G. Baker; Michael Griggs; Van Nguyen; H. Vernon Baker

doi:10.1117/12.210913

2 June 1995 MSTI-3 sensor package optical design

Richard F. Horton, William G. Baker, Michael Griggs, Van Nguyen, H. Vernon Baker

Proceedings Volume 2478, Space Telescopes and Instruments; (1995) https://doi.org/10.1117/12.210913
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

The MSTI-3 sensor package is a three band imaging telescope for military and dual use sensing missions. The MSTI-3 mission is one of the Air Force Phillips Laboratory's Pegasus launched space missions, a third in the series of state-of-the-art lightweight sensors on low cost satellites. The satellite is planned for launch into a 425 Km orbit in late 1995. The MSTI- 3 satellite is configured with a down looking two axis gimbal and gimbal mirror. The gimbal mirror is an approximately 13 cm by 29 cm mirror which allows a field of regard approximately 100 degrees by 180 degrees. The optical train uses several novel optical features to allow for compactness and light weight. A 105 mm Ritchey Chretien Cassegrain imaging system with a CaF₂ dome astigmatism corrector is followed by a CaF₂ beamsplitter cube assembly at the systems first focus. The dichroic beamsplitter cube assembly separates the light into a visible and two IR channels of approximately 2.5 to 3.3, (SWIR), and 3.5 to 4.5, (MWIR), micron wavelength bands. The two IR imaging channels each consist of unity power re-imaging lens cluster, a cooled seven position filter wheel, a cooled Lyot stop and an Amber 256 X 256 InSb array camera. The visible channel uses a unity power re- imaging system prior to a linear variable filter with a Sony CCD array, which allows for a multispectral imaging capability in the 0.5 to 0.8 micron region. The telescope field of view is 1.4 degrees square.

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Richard F. Horton, William G. Baker, Michael Griggs, Van Nguyen, and H. Vernon Baker "MSTI-3 sensor package optical design", Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995); https://doi.org/10.1117/12.210913

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KEYWORDS

Mirrors

Beam splitters

Mid-IR

Short wave infrared radiation

Sensors

Telescopes

Relays

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