Stray Light Analysis of High Resolution Camera for a Low-Earth-Orbit Satellite

Park, Jun-Oh; Jang, Won Kweon; Kim, Seonghui; Jang, Hong-Sul; Lee, Seung‐Hoon

doi:10.3807/josk.2011.15.1.052

Cited by 23 publications

(11 citation statements)

References 10 publications

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“…In this situation the redistribution of the power can reduce the aberration of the system. How to resist stray light is an important problem needed to be concerned in the reflective system [8]. In the design, the emergent surface is placed between the two mirrors, which can shorten the length of the system and make it more compact.…”

Section: Optical Design Resultsmentioning

confidence: 99%

A Design of Mid-wave Infrared Integral Catadioptric Optical System with Wide FOV

Yu¹,

Jia²,

Wang³

et al. 2013

Journal of the Optical Society of Korea

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In order to deduce the difficulty of fixing the Ritchey-Chretien (R-C) dual reflective optical system and enhance the stability of the secondary mirror, a compact integral structure is presented here composed of two transmitting and two reflective aspheric surfaces. The four surfaces were manufactured from a single germanium lens and integrated together. The two reflective surfaces formed by coating the inner reflecting films were assembled in one lens. It makes the installation of the two mirrors easier and the structure of the secondary mirror more stable. A design of mid-wave infrared (MWIR) compact imaging system is presented with a spectral range chosen as 3.7-4.8 µm. The effective focal length is f=90 mm. The field of view (FOV) for the lens is 4.88°. It has good imaging capability with Modulation Transfer Function (MTF) of all field of view more than 0.55 close to the diffraction limitation. Outdoor experiments were carried out and it is shown that the integral catadioptric optical system performs well on imaging.

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Section: Optical Design Resultsmentioning

confidence: 99%

A Design of Mid-wave Infrared Integral Catadioptric Optical System with Wide FOV

Yu¹,

Jia²,

Wang³

et al. 2013

Journal of the Optical Society of Korea

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“…[5][6][7][8] . 미광은 일반적으로 경통 내부에서 부분 반사 및 전반사에 의해 생기는 유령광(ghost light) 과 렌즈 면 및 경통 내부의 산란에서 생기는 산란광(scattering light)으로 나눌 수 있다 [5] .…”

Section: Fig 3 Comis Cross-sectional Viewunclassified

“…미광은 일반적으로 경통 내부에서 부분 반사 및 전반사에 의해 생기는 유령광(ghost light) 과 렌즈 면 및 경통 내부의 산란에서 생기는 산란광(scattering light)으로 나눌 수 있다 [5] . 미광은 정밀 광학계, 현미경 광학 계, 분광 광학계를 포함한 많은 광학계에서 광학계의 가시도 저하 및 복사 정밀도 하락 등의 품질 저하를 발생시킨다 [6] . …”

Section: Fig 3 Comis Cross-sectional Viewunclassified

Stray Light Analysis of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Lee¹,

Lee²

2012

Korean Journal of Optics and Photonics

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This paper reports on the stray light analysis results of a compact imaging spectrometer (COMIS) for a microsatellite STSAT-3. COMIS images Earth's surface and atmosphere with ground sampling distances of 27 m at the 18 ~ 62 spectral bands (0.4 ~ 1.05 μm) for the nadir looking at an altitude of 700 km. COMIS has an imaging telescope and an imaging spectrometer box into which three electronics PCBs are embedded. The telescope images a 27 m × 28 km area of Earth surface onto a slit of dimensions 11.8 μm × 12.1 mm. This corresponds to a ground sampling distance of 27 m and a swath width of 28 km for nadir looking posture at an altitude of 700 km. Then the optics relays and disperses the slit image onto the detector thereby producing a monochrome image of the entrance slit formed on each row of detector elements. The spectrum of each point in the row is imaged along a detector column. The optical mounts and housing structures are designed in order to prevent stray light from arriving onto the image and so deteriorating the signal to noise ratio (SNR). The stray light analysis, performed by a non-sequential ray tracing software (LightTools) with three dimensional housing and lens modeling, confirms that the ghost and stray light arriving at the detector plane has the relative intensity of ~10 -5 and furthermore it locates outside the concerned image size i.e. the field of view of the optics.

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“…Nowadays analyzing stray light incoming along abnormal optical paths and canceling optical noise are recognized as the core technology of high quality optical systems. In particular, stray light that is unwanted light reaching a detector sometimes lessens the signal to noise ratio of the system by generating scattered or directional optical noise from various sources [4][5][6]. Analyzing the stray light of the system is therefore important because it reduces the risk of redesign or even of irreversible error.…”

Section: Introductionmentioning

confidence: 99%

Optical Noise Removal in the Focal Plane of the Spaceborne Camera

Park¹,

Jang²,

Kim³

et al. 2011

Journal of the Optical Society of Korea

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We discuss two possible optical noise sources in an electro-optic camera loaded on a low earth orbit satellite. The first noise source was a reflection at the window for signal rays incident upon the window which is placed before the FPA plane. The second noise source came from a reflection at the surface of the FPA cell when the signal flux is not entirely absorbed. We investigate the noise generation processes for two optical noise sources, and a parametric solution is used to estimate the optical noise effects.

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Stray Light Analysis of High Resolution Camera for a Low-Earth-Orbit Satellite

Cited by 23 publications

References 10 publications

A Design of Mid-wave Infrared Integral Catadioptric Optical System with Wide FOV

A Design of Mid-wave Infrared Integral Catadioptric Optical System with Wide FOV

Stray Light Analysis of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Optical Noise Removal in the Focal Plane of the Spaceborne Camera

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