Dynamic Optimization of an Optical System :Jitter Control by Optical Compensation
Date Issued
2008
Date
2008
Author(s)
Hsu, Wei-Chi
Abstract
High-resolution optical remote sensing has been one of the major trends amid the development of satellite-related technologies. The jitters of the satellite, however, degrade the image quality of the optical remote sensing system. Traditionally, the jitters are controlled and suppressed by the satellite itself. Nevertheless, they can only be minimized instead of being eliminated, even though the designs and manufacturing techniques of satellites have improved during the past few decades. Any jitter experienced by the satellite definitely downgrades several imaging parameters, such as the MTF (Modulation Transfer Function), etc. This experiment will focus on developing a jitter control unit using optical compensation , which detects the jitter amount and implement the compensation accordingly. We used a simple structure in the experiment to verify the feasibility of the jitter control unit using optical compensation. We used a steady He-Ne Laser to be the reference light source which launched into the silvering reflection mirror which was on the speaker. We inputted voltage to the speaker to generate vibration, the light fluctuation is generated through the speaker to imitate the jitter. The jitter sensor detected the light fluctuation amount and the computer calculated the amount to decide how much the compensator have to rotate, to compensate the jitter on the satellite. We used only one light source in the experiment. Because the fund was finite, we did not add the optical remote system and image system to the experiment. In the other hand, if we add the two systems to the experiment, the experiment structure would be very complicated. So we just used one light source to imitate the jitter effect, and used optical compensation jitter control unit to proceed real-time compensation.
Subjects
Optical Remote Sensing,
Jitter
He-Ne Laser
Optical Compensation
Speaker, Silvering Reflection Mirror
Light fluctuation
Type
thesis
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ntu-97-R95941059-1.pdf
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