Acta Photonica Sinica, Volume. 46, Issue 12, 1211003(2017)
Theoretical Stray Light Analysis of Side-baffled Sky Brightness Photometer
A sky brightness photometer with a side-baffled structure, which adopts multibaffles to suppress diffracted stray light layer-by-layer in the inner field of view, is proposed. In addition, specially designed upper baffles block both scattered and diffracted stray light in the outer field of view. A mathematical model is established to simulate the baffles, and calculated results show that the field of view of the photometer can be designed to be 3.5~10 solar radii by optimizing the geometric parameters of the baffles. The stray light in the full field of view can be suppressed effectively to less than 10-8 of the mean solar brightness. Compared with the High Altitude Observatory, which has a sky brightness monitor with a field of view of 4~8 solar radii and a stray light level of 10-7 of the mean solar brightness, the proposed photometer expands the observable field of view and improves the stray light suppression level by over an order of magnitude.
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SUN Ming-zhe, ZHANG Hong-xin, LIU Wei-xin, XIA Li-dong. Theoretical Stray Light Analysis of Side-baffled Sky Brightness Photometer[J]. Acta Photonica Sinica, 2017, 46(12): 1211003
Received: May. 27, 2017
Accepted: --
Published Online: Nov. 23, 2017
The Author Email: Ming-zhe SUN (sunmingzhe@sdu.edu.cn)