Suppression of stray light for long focal length off-axis three-mirror optical system

Xiao-ping, 李晓平 Li; Sheng-chun, 沙晟春 Sha; Tingliang, 胡亭亮 Hu

doi:10.3788/ope.20111911.2603

Cited by 1 publication

(2 citation statements)

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“…PST is an important index for the evaluation of the stray light suppression ability. This is defined as [12][13][14][15]: The ratio between the irradiance Ed (θ) on the image plane from the point source with a field of view θ through the optical system and the irradiance Ei (θ) on the input port of the optical system, which is expressed as:…”

Section: Illuminance Of the Earth-atmosphere Stray Lightmentioning

confidence: 99%

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Calculation Method of Earth-Atmosphere Stray Light Illuminance on Low-orbit Space Cameras

Du¹,

Yang²,

Chen³

et al. 2013

JMM

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The earth-atmosphere stray light can lower contrast ratio and SNR of spatial optical remote sensors, or even fail the system at certain conditions. Errors in the calculation of the stray light illuminance based on point source are very large, for the satellite's altitude is only several hundred kilometers and far less than the radius of the earth. This paper proposed a stray light illuminance calculating method which viewed the earth as a plane stray source and introduced the method in detail. Using the calculating method, earth-atmosphere stray light illuminance on the camera image plane for a low-orbit space camera at a typical position is calculated, and the results were compared with those calculated by viewing the earth as a point source, which evidently show that, when considering the earth-atmosphere stray light's effects on low-orbit space cameras, it's necessary to treat the earth as a plane extended light source.

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Section: Illuminance Of the Earth-atmosphere Stray Lightmentioning

confidence: 99%

“…So, the PST values for different off-axis angle under only one azimuth angle are needed. According the area element illuminance and PST values calculated, and formula (12), the total illuminance Estray on the camera image plane for the whole stray light region of the earth is 2.9×10-4W/m2.…”

Section: Numerical Reusltsmentioning

confidence: 99%