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http://dx.doi.org/10.3807/KJOP.2015.26.3.155

Design and Performance Analysis of an Off-Axis Three-Mirror Telescope for Remote Sensing of Coastal Water  

Oh, Eunsong (Korea Ocean Satellite Centre, Korea Institute of Ocean Science & Technology)
Kang, Hyukmo (Korea Ocean Satellite Centre, Korea Institute of Ocean Science & Technology)
Hyun, Sangwon (Center for Anlytical Instrumentation Development, Korea Basic Science Institute)
Kim, Geon-Hee (Center for Anlytical Instrumentation Development, Korea Basic Science Institute)
Park, YoungJe (Korea Ocean Satellite Centre, Korea Institute of Ocean Science & Technology)
Choi, Jong-Kuk (Korea Ocean Satellite Centre, Korea Institute of Ocean Science & Technology)
Kim, Sug-Whan (Space Optics Laboratory, Yonsei University)
Publication Information
Korean Journal of Optics and Photonics / v.26, no.3, 2015 , pp. 155-161 More about this Journal
Abstract
We report the design and performance analysis of an off-axis three-mirror telescope as the fore optics for a new hyperspectral sensor aboard a small unmanned aerial vehicle (UAV), for low-altitude coastal remote sensing. The sensor needs to have at least 4 cm of spatial resolution at an operating altitude of 500 m, $4^{\circ}$ field of view (FOV), and a signal to noise ratio (SNR) of 100 at 660 nm. For these performance requirements, the sensor's optical design has an entrance pupil diameter of 70 mm and an F-ratio of 5.0. The fore optics is a three-mirror system, including aspheric primary and secondary mirrors. The optical performance is expected to reach $1/15{\lambda}$ in RMS wavefront error and 0.75 in MTF value at 660 nm. Considering the manufacturing and assembling phase, we determined the alignment compensation due to the tertiary mirror from the sensitivity, and derived the tilt-tolerance range to be 0.17 mrad. The off-axis three-mirror telescope, which has better performance than the fore optics of other hyperspectral sensors and is fitted for a small UAV, will contribute to ocean remote-sensing research.
Keywords
Fore optics; Off-axis three-mirror system; Remote sensing; Unmanned aerial vehicle;
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Times Cited By KSCI : 7  (Citation Analysis)
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