Optomechanical Design of a Compact Imaging Spectrometer for a Microsatellite STSAT3

Lee, Jun Ho; Lee, Chi Weon; Kim, Yong Min; Kim, Jae Wook

doi:10.3807/josk.2009.13.2.193

Cited by 20 publications

(9 citation statements)

References 10 publications

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“…Temperature distributions and deformations of COMIS for the worst hot and cold conditions [8] . [8] .…”

Section: Figmentioning

confidence: 99%

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Environmental Test Results of a Flight Model of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Lee

Kim²,

Lee³

et al. 2011

Korean Journal of Optics and Photonics

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Environmental Test Results of a Flight Model of a Compact Imaging Spectrometer for a Microsatellite STSAT-3A compact imaging spectrometer (COMIS) was developed for a microsatellite STSAT-3. The satellite is now rescheduled to be launched into a low sun-synchronous Earth orbit (~700 km) by the end of 2012. Its main operational goal is the imaging of the Earth's surface and atmosphere with ground sampling distance of 27 m and 2 -15 nm spectral resolution over visible and near infrared spectrum (0.4 -1.05 μm). A flight model of COMIS was developed following an engineering model that had successfully demonstrated hyperspectral imaging capability and structural rigidity. In this paper we report the environmental test results of the flight model. The mechanical stiffness of the model was confirmed by a small shift of the natural frequency i.e., < 1% over 10 gRMS random vibration test. Electrical functions of the model were also tested without showing any anomalies during and after vacuum thermal cycling test with < 10 -5 torr and-30℃ -35℃. The imaging capability of the model, represented by a modulation transfer function (MTF) value at the Nyquist frequency, was also kept unvaried after all those environmental tests.

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“…Temperature distributions and deformations of COMIS for the worst hot and cold conditions [8] . [8] .…”

Section: Figmentioning

confidence: 99%

“…소형영상분광기(COMIS, compact imaging spectrometer)는 과학기술위성3호의 부탑재체로 지표면 및 대기 과학을 연구 할 목적으로 개발된 분광 카메라이다 [7][8][9] . COMIS는 고도 700 km의 태양 동기 궤도 상공에서 27 m 지상 해상도를 갖고 관측 폭 28 km의 지표면 및 대기를 관측하게 된다.…”

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Environmental Test Results of a Flight Model of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Lee

Kim²,

Lee³

et al. 2011

Korean Journal of Optics and Photonics

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“…Thus, the lenses, mirrors, and structures are all made of the same fused-silica material, which is both radiation hardened and relatively nonsusceptible to thermal expansion. Details of the mechanical designs will be fully dealt in a separate paper [4].…”

Section: Design Of the Imaging Telescopementioning

confidence: 99%

“…MTF values for manufacturing and Assembly/Integration/Test (AIT) were predicted by Monte Carlo analysis using commercially available software (ZEMAX) with the tolerances given in Table 2. Decreases in MTF (due instabilities inherent in space flight, such as thermal expansion and zero gravity environ-ments) were also predicted by the finite element analysis (FEA) of the COMIS mechanical model [4]. Table 3 summarizes the MTF calculation at the Nyqust frequency of the CCD detector (38.5 lines-per-mm).…”

Section: System Mtfmentioning

confidence: 99%

Optical Design of A Compact Imaging Spectrometer for STSAT3

Lee

Jang

Yang

et al. 2008

Journal of the Optical Society of Korea

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A compact imaging spectrometer (COMIS) for use in the STSAT3 microsatellite is currently under development. It is scheduled to be launched into a low Sun-synchronous Earth orbit (~700 km) by the end of 2010. COMIS was inspired by the success of CHRIS, which is a small hyperspectral imager developed for the ESA microsatellite PROBA. COMIS is designed to achieve nearly equivalent imaging capabilities of CHRIS in a smaller (65 mm diameter and 4.3 kg mass) and mechanically superior (in terms of alignment and robustness) package. Its main operational goal will be the imaging of Earth's surface and atmosphere with ground sampling distances of ~30 m at the 18~62 spectral bands (4.0~1.05 μm). This imaging will be used for environmental monitoring, such as the in-land water quality monitoring of Paldang Lake, which is located next to Seoul, South Korea. The optics of COMIS consists of two parts: imaging telescope and dispersing relay optics. The imaging telescope, which operates at an f-ratio of 4.6, forms an image (of Earth's surface or atmosphere) onto an intermediate image plane. The dispersion relay optics disperses the image and relay it onto a CCD plane. All COMIS lenses and mirrors are spherical and are made from used silica exclusively. In addition, the optics is designed such that the optical axis of the dispersed image is parallel to the optical axis of the telescope. Previous efforts focused on manufacturing ease, alignment, assembly, testing, and improved robustness in space environments.

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“…However, the most common methods of analyzing stray light are radiometry and ray tracing [8][9][10][11]. Radiometry calculates the transferred power of stray light from object to object in an optical system.…”

Section: Introductionmentioning

confidence: 99%

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

Park¹,

Jang²,

Kim³

et al. 2011

Journal of the Optical Society of Korea

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We discuss the effect of stray light on a high-precision camera in an LEO(Low Earth Orbit) satellite. The critical objects and illumination objects were sorted to discover the stray light sources in the optical system. Scatter modeling was applied to determine a noise effect on the surface of a detector, and the relative flux of a signal and noise were also calculated. The stable range of reflectivity of the beam splitter was estimated for various scattering models.

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Optomechanical Design of a Compact Imaging Spectrometer for a Microsatellite STSAT3

Cited by 20 publications

References 10 publications

Environmental Test Results of a Flight Model of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Environmental Test Results of a Flight Model of a Compact Imaging Spectrometer for a Microsatellite STSAT-3

Optical Design of A Compact Imaging Spectrometer for STSAT3

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

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