LEO thermal imagers: push broom or whisk broom?

Pierre J. Turon; Thibault S. Depost

doi:10.1117/12.137969

16 September 1992 LEO thermal imagers: push broom or whisk broom?

Pierre J. Turon, Thibault S. Depost

Proceedings Volume 1689, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III; (1992) https://doi.org/10.1117/12.137969
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

LEO Thermal imaging is controlled by two parameters: t_o time need to scan the foot print along the track and t_i integration time in thermal band. It is known that whisk broom is adequate when t_o > > t_i (low resolution) and push broom is of interest when t_o is congruent to t_i (high resolution). However moderate size projects are limited to low or intermediate resolution (for 30 m, t_o is about two orders of magnitude greater than t_i) and push broom is not mandatory. The need for high frequency calibration to eliminate 1/f detector noise (especially for (lambda) > 11 micrometers ) makes push broom advantage smaller than expected. Microscanning can be thought of as a way to match t_o and t_i as well as a convenient calibration mechanism. A configuration mixing microscanning and push broom design is shown to be a very efficient compromise. Problems like detector butting, fast calibration, long life time mechanism, and signal processing at chip level are more easily solved within the proposed concept.

Citation Download Citation

Pierre J. Turon and Thibault S. Depost "LEO thermal imagers: push broom or whisk broom?", Proc. SPIE 1689, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III, (16 September 1992); https://doi.org/10.1117/12.137969

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