Optical simulations for the Wolter-I collimator in the VERT-X calibration facility

2021 ◽  
Author(s):  
Daniele Spiga ◽  
Alberto Moretti ◽  
Giovanni Pareschi ◽  
Giorgia Sironi ◽  
Gianpiero Tagliaferri ◽  
...  
Keyword(s):  
Calibration Facility ◽  
Thé Vert

The VERT-X calibration facility: development of the most critical parts.

2021 ◽  
Author(s):  
Alberto Moretti ◽  
Daniele Spiga ◽  
Giorgia Sironi ◽  
Giovanni Pareschi ◽  
Stefano Basso ◽  
...  
Keyword(s):  
Calibration Facility ◽  
Thé Vert

scholarly journals Radiometric Performance Evaluation of FY-4A/AGRI Based on Aqua/MODIS

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1859
Author(s):  
Bo Zhong ◽  
Yingbo Ma ◽  
Aixia Yang ◽  
Junjun Wu
Keyword(s):  
Near Infrared ◽  
Spectral Response ◽  
Convective Cloud ◽  
Radiation Level ◽  
High Attenuation ◽  
Total Attenuation ◽  
Attenuation Rate ◽  
Calibration Facility ◽  
Deep Convective Cloud ◽  
Directional Reflectance

Fengyun-4A (FY-4A) is the first satellite of the Chinese second-generation geostationary orbit meteorological satellites (FY-4). The Advanced Geostationary Radiation Imager (AGRI), onboard FY-4A does not load with high-precision calibration facility in visible and near infrared (VNIR) channel. As a consequence, it is necessary to comprehensively evaluate its radiometric performance and quantitatively describe the attenuation while using its VNIR data. In this paper, the radiometric performance at VNIR channels of FY-4A/AGRI is evaluated based on Aqua/MODIS data using the deep convective cloud (DCC) target. In order to reduce the influence of view angle and spectral response difference, the bi-directional reflectance distribution function (BRDF) correction and spectral matching have been performed. The evaluation result shows the radiometric performance of FY-4A/AGRI: (1) is less stable and with obvious fluctuations; (2) has a lower radiation level because of 24.99% lower compared with Aqua/MODIS; 3) has a high attenuation with 9.11% total attenuation over 2 years and 4.0% average annual attenuation rate. After the evaluation, relative radiometric normalization between AGRI and MODIS in VNIR channel is performed and the procedure is proved effective. This paper proposed a more reliable reference for the quantitative applications of FY-4A data.

Thé vert, thé noir, quels bénéfices pour la santé?

2020 ◽  
Vol 16 (62) ◽  
pp. 29-34
Author(s):  
Anne-Marie Roussel
Keyword(s):  
Thé Vert

Liquid-Hydrogen Flowmeter Calibration Facility

1962 ◽  
pp. 189-197
Author(s):  
H. L. Minkin ◽  
H. F. Hobart ◽  
I. Warshawsky
Keyword(s):  
Liquid Hydrogen ◽  
Calibration Facility ◽  
Flowmeter Calibration
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