Optical system design of CO<sub>2</sub>sounder

Yu-quan, 郑玉权 Zheng; Zhi-liang, 高志良 Gao

doi:10.3788/ope.20122012.2645

Cited by 2 publications

(1 citation statement)

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“…The ACGS instrument consists of three grating spectrometers which are integrated into a common structure with similar optical designs. Figure 2 shows the major optical components and optical path of ACGS, which consists of a specially designed pointing mirror, an afocal telescope, a beam splitter, a focusing system, an entrance slit, a collimating system, a plane grating and a focal plane imaging system [12]. The pointing mirror, made of aluminum alloy, is mounted on a 1D rotating mechanism.…”

Section: Description Of the Acgsmentioning

confidence: 99%

Preflight radiometric calibration of a carbon dioxide spectrometer

et al. 2019

Meas. Sci. Technol.

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The first Chinese Carbon Dioxide Observation Satellite (TanSat), which is designed to make high-precision, high-spatial resolution measurements of carbon dioxide, was successfully launched on 22 December 2016. There are two instruments installed on the TanSat: the High Resolution Hyper-Spectral Sensor for carbon observation Grating Spectrometer, aiming at measuring the amount of carbon dioxide (CO 2 ) in the atmosphere, and the cloud and aerosol polarimetric imager to identify the disturbance by clouds and to detect the impact of aerosol within the instrument instantaneous field of view. The two instruments work together to make global, high-precision CO 2 measurements with exactly correction of cloud and aerosol interference. The major content of this paper is the laboratory radiometric calibration of ACGS. Both the gain coefficients and the dark current response of each channel were determined during instrument-level ground testing. The gain coefficients for the ACGS were characterized by measuring the instrument response to illumination by an integrating sphere at several light levels. The dark response was calibrated with additional thermal balance testing. This paper also identified bad pixels, recorded in a table of data elements, to be omitted in science data processing. The uncertainties achieved during the radiometric calibration were below 5% (k = 1), meeting the absolute calibration mission requirements.

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Section: Description Of the Acgsmentioning

confidence: 99%