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http://dx.doi.org/10.20910/JASE.2018.12.3.9

Design of 3-Axis Focus Mechanism Using Piezoelectric Actuators for a Small Satellite Camera  

Hong, Dae Gi (Dept. of Aerospace and Mechanical Engineering, Graduate School at Korea Aerospace University)
Hwang, Jai Hyuk (Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
Publication Information
Journal of Aerospace System Engineering / v.12, no.3, 2018 , pp. 9-17 More about this Journal
Abstract
For Earth observation, a small satellite camera has relatively weak structural stability compared to medium-sized satellite, resulting in misalignment of optical components due to severe launching and space environments. These alignment errors can deteriorate the optical performance of satellite cameras. In this study, we proposed a 3-axis focus mechanism to compensate misalignment in a small satellite camera. This mechanism consists of three piezo-electric actuators to perform x-axis and y-axis tilt with de-space compensation. Design requirements for the focus mechanism were derived from the design of the Schmidt-Cassegrain target optical system. To compensate the misalignment of the secondary mirror (M2), the focus mechanism was installed just behind the M2 to control the 3-axis movement of M2. In this case, flexure design with Box-Behnken test plan was used to minimize optical degradation due to wave front error. The wave front error was analyzed using ANSYS. The fabricated focus mechanism demonstrated excellent servo performance in experiments with PID servo control.
Keywords
Small Satellite Camera; Misalignment; Refocusing; Focus Mechanism;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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