28 October 2014 A relay imaging probe to check focus map of Earth-observing pushbroom imager
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Abstract
Bar chart patterns projects by collimator was adopted to measure contrast transfer function (CTF)values at Nyquist frequency before assembly of imaging sensor with telescope for earth-observing pushbroom imager. A relay imaging probe consisting of optical objective and 2D imaging sensor was builded to image these projected pattern and estimate the image quality of optical system before alignment of linear imaging sensor. By riding on a hexapod stage and measuring at a series focus position at several field angles, this probe provides a reference map for alignment of imaging sensor and image quality assessment. Certainly, testing result can be used to anticipate result of focusing alignment.
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H. L. Tsay, P. H. Huang, T. M. Huang, "A relay imaging probe to check focus map of Earth-observing pushbroom imager", Proc. SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 924126 (28 October 2014); doi: 10.1117/12.2067408; https://doi.org/10.1117/12.2067408
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