Wide-field-of-view Schmidt-sphere imaging collimator

Berton C. Willard

doi:10.1117/12.363522

24 September 1999 Wide-field-of-view Schmidt-sphere imaging collimator

Berton C. Willard

Proceedings Volume 3750, Earth Observing Systems IV; (1999) https://doi.org/10.1117/12.363522
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A collimator was required to qualify the Advanced Land Imager (ALI) instrument of the EO-1 new millennium satellite for focus, MTF measurements, and distortion. It was used during assembly of the instrument and during thermal cycling while the instrument was in a vacuum tank. It had to be diffraction-limited over a 3 X 3 degree field of view and over a waveband of 400 to 2500 nm, have no obstruction, and have a virtual exit pupil that could be imaged onto the entrance pupil of the telescope. To satisfy these requirements the collimator, external to the vacuum tank, was built comprising a spherical mirror with exit pupil at its center of curvature, a full-aperture beamsplitter in collimated space, and a single lens to flatten the field. The optical layout and method of verifying collimation will be presented as well as optical performance, of interest since no corrector plate could be used as in the usual Schmidt camera configuration.

Citation Download Citation

Berton C. Willard "Wide-field-of-view Schmidt-sphere imaging collimator", Proc. SPIE 3750, Earth Observing Systems IV, (24 September 1999); https://doi.org/10.1117/12.363522

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