Optical design of moon-based earth’s plasmaspheric extreme ultraviolet imager

Bo, 陈波 Chen; Fei, 何飞 He

doi:10.3788/ope.20111909.2057

Cited by 9 publications

(2 citation statements)

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Section: Optical Designmentioning

confidence: 99%

“…Since no material that transmits in optical is suitable for the EUV wavelength range, the EUVC should implement a reflective optical system (Chen & He 2011), among which both grazing incidence designs and normal incidence designs are applicable. Commonly used grazing incidence designs include Wolter type and KB type, both of which have the property of a small FoV and large volume which are not suitable for the EUVC.…”

Section: Optical Designmentioning

confidence: 99%

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Development and calibration of the Moon-based EUV camera for Chang'e-3

Song

et al. 2014

Res. Astron. Astrophys.

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The process of development and calibration for the first Moon-based extreme ultraviolet (EUV) camera to observe Earth's plasmasphere is introduced and the design, test and calibration results are presented. The EUV camera is composed of a multilayer film mirror, a thin film filter, a photon-counting imaging detector, a mechanism that can adjust the direction in two dimensions, a protective cover, an electronic unit and a thermal control unit. The center wavelength of the EUV camera is 30.2 nm with a bandwidth of 4.6 nm. The field of view is 14.7 • with an angular resolution of 0.08 • , and the sensitivity of the camera is 0.11 count s −1 Rayleigh −1. The geometric calibration, the absolute photometric calibration and the relative photometric calibration are carried out under different temperatures before launch to obtain a matrix that can correct geometric distortion and a matrix for relative photometric correction, which are used for in-orbit correction of the images to ensure their accuracy.

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Section: Optical Designmentioning

confidence: 99%

Section: Optical Designmentioning

confidence: 99%

Development and calibration of the Moon-based EUV camera for Chang'e-3

Song

et al. 2014

Res. Astron. Astrophys.

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Inversion of the Earth's Plasmaspheric Density Distribution from EUV Images with Genetic Algorithm

Zhang

Chen

et al. 2012

Chinese J of Geophysics

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The principles for inversion of plasmaspheric He+ density from the extreme ultraviolet images of the Earth's plasmasphere with one‐dimensional genetic algorithm are introduced. The three‐dimensional problem is transformed into one‐dimensional case through flux tube approximation and dipole magnetic field approximation. With a weighted matrix, the extreme ultraviolet intensity integration equation is discretized into linear equation systems, then the one‐dimensional real‐coded genetic algorithm is used to inverse the equatorial plane plasmaspheric He+ density, and finally the three‐dimensional density is obtained by magnetic field line tracing. The density and intensity simulated by the dynamic global core plasma model are used as the primary input parameters, and the corresponding density distribution is determined through genetic iterations. The results show that the relative density error is less than 8% and the relative intensity error tends to be zero, which proves that our algorithm is effective and feasible. The result of this work will provide a basis for the inversion of the moon‐based EUV images in the Second Phase of Chinese Lunar Exploration Program.

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Scientific Instrument Technology of Lunar Lander

Sun

Zhang

2021

Technology of Lunar Soft Lander

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Optical design of moon-based earth’s plasmaspheric extreme ultraviolet imager

Cited by 9 publications

References 0 publications

Development and calibration of the Moon-based EUV camera for Chang'e-3

Development and calibration of the Moon-based EUV camera for Chang'e-3

Inversion of the Earth's Plasmaspheric Density Distribution from EUV Images with Genetic Algorithm

Scientific Instrument Technology of Lunar Lander

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