Preliminary results of relative radiometer to measure the Earth’s outgoing radiation on FY-3F satellite

2021 ◽  
Author(s):  
Duo Wu ◽  
Ping Zhu ◽  
Wei Fang ◽  
Xin Ye ◽  
Kai Wang ◽  
...  
Keyword(s):  
Solar Irradiance ◽  
Interannual Variation ◽  
Dynamic Range ◽  
Field Of View ◽  
Radiation Budget ◽  
Temperature Control System ◽  
Outgoing Radiation ◽  
The Earth ◽  
High Dynamic ◽  
The Absolute

<p>A space based relative radiometer has been developed and applied to the PICARD mission. It has successfully measured 37 months solar radiation, terrestrial outgoing radiation, and a comparable interannual variation in Earth Radiation Budget (ERB) is inferred from those measurements [1]. However, since the BOS (Bolometric Oscillation Sensor [2]) relative radiometer is originally designed to measure the solar irradiance with 10 seconds high cadence comparing to the absolute radiometer. The high dynamic range of BOS limits its performance to track the Earth’s outgoing radiation in terms of instantaneous field-of-view (iFOV) and the absolute radiation level. Two relative radiometers (RR) will be developed for JTSIM/FY-3F. One is the solar channel relative radiometer aimed to measure the solar irradiance side by side with the cavity solar irradiance absolute radiometer (SIAR). The second RR is acting as a non-scanner instrument to measure the Earth’s outgoing radiation. Comparing to the design of PICRD-BOS. Each RR has included an aperture, for the solar channel it limits its Unobstructed Field of View (UFOV) to about 1.5 degree and for the Earth channel to about 110 degrees, respectively. We also test the possibility to use the Carbon Nanotube coating on the main detector. In this presentation, the design of the earth channel relative radiometer (ERR) will be introduced, including the aperture design, dynamic range and the active temperature control system. The preliminary laboratory test result of the ERR will be discussed in the end.</p><p>[1] <strong>P. Zhu,</strong> M. Wild, M. van Ruymbeke, G. Thuillier, M. Meftah, and Ö. Karatekin. Interannual variation of global net radiation flux as measured from space. J. Geophys. Res. doi:10.1002/2015JD024112, 121:6877–6891, 2016.</p><p>[2] <strong>P. Zhu,</strong> M.van Ruymbeke, Ö. Karatekin, J.-P.Noël, G. Thuillier, S. Dewitte, A. Chevalier, C. Conscience, E. Janssen, M. Meftah, and A. Irbah. A high dynamic radiation measurement instrument: the bolometric oscillation sensor (bos). Geosci. Instrum. Method. Data Syst., 4,89-98,:doi:10.5194/gi–4–89–2015, 2015.</p><p><strong>Acknowledgement</strong>: this work is partly supported by the National Natural Science Foundation of China No. 41974207 and CSC Scholarship No.202004910181</p><p> </p>

scholarly journals Non-Intrusive Luminance Mapping via High Dynamic Range Imaging and 3-D Reconstruction

2021 ◽  
Vol 2042 (1) ◽  
pp. 012113
Author(s):  
Michael Kim ◽  
Athanasios Tzempelikos
Keyword(s):  
Dynamic Range ◽  
Low Cost ◽  
High Dynamic Range ◽  
Field Of View ◽  
High Dynamic Range Imaging ◽  
3D Space ◽  
Short Video ◽  
High Dynamic ◽  
Daylighting Control ◽  
Good Agreement

Abstract Continuous luminance monitoring is challenging because high-dynamic-range cameras are expensive, they need programming, and are intrusive when placed near the occupants’ field-of-view. A new semi-automated and non-intrusive framework is presented for monitoring occupant-perceived luminance using a low-cost camera sensor and Structure-from- Motion (SfM)-Multiview Stereo (MVS) photogrammetry pipeline. Using a short video and a few photos from the occupant position, the 3D space geometry is automatically reconstructed. Retrieved 3D context enables the back-projection of the camera-captured luminance distribution into 3D spaces that are in turn re-projected to occupant-FOVs. The framework was tested and validated in a testbed office. The re-projected luminance field showed with good agreement with luminance measured at the occupant position. The new method can be used for non-intrusive luminance monitoring integrated with daylighting control applications.

Complexity in Solar Irradiance From the Earth Radiation Budget Satellite

2015 ◽  
Vol 9 (2) ◽  
pp. 487-494 ◽  
Author(s):  
Mofazzal Hossain Khondekar ◽  
Dipendra Nath Ghosh ◽  
Koushik Ghosh ◽  
Anup Kumar Bhattacharjee
Keyword(s):  
Solar Irradiance ◽  
Radiation Budget ◽  
The Earth ◽  
Earth Radiation Budget ◽  
Earth Radiation

How to calibrate a solar radiometer

2021 ◽  
Author(s):  
Wolfgang Finsterle ◽  
Margit Haberreiter ◽  
Jean-Philippe Montillet
Keyword(s):  
Solar Energy ◽  
Solar Irradiance ◽  
Total Solar Irradiance ◽  
Radiation Budget ◽  
Special Focus ◽  
Energy Applications ◽  
Advantages And Disadvantages ◽  
Technical Developments ◽  
The Earth ◽  
Observation Instruments

<p>Solar radiometers are deployed in many locations on the ground and in space. The radiometers in space are measuring the solar energy input into the Earth system per time and unit area, also known as the Total Solar Irradiance (TSI). TSI radiometers are also used to calibrate Earth Observation instruments and to measure the Total Outgoing Radiation (TOR) at the top of the atmosphere, which is a key component in the Earth Radiation Budget (ERB). Ground-based solar radiometers measure the local irradiance levels, which are used for monitoring of atmospheric properties and solar energy applications.</p><p>Traceability of the radiation measurements to SI units is crucial in all of these applications. However, calibrating and characterising a solar radiometer is a technically challenging task. Depending on the requirements for a specific application, different calibration concepts <span>can be employed in the calibration and characterization process.</span></p><p><span>We will present the currently available calibration concepts, their advantages and disadvantages, and put special focus on recent technical developments, such as the cryogenic standard radiometers for solar irradiance on the ground and in space. </span></p>

scholarly journals A Multi-Frequency VLBI Polarization Study of the CSS Quasar 3C 309.1

1998 ◽  
Vol 164 ◽  
pp. 105-106
Author(s):  
Scott E. Aaron ◽  
John F.C. Wardle ◽  
David H. Roberts
Keyword(s):  
Radio Source ◽  
Dynamic Range ◽  
Ambient Medium ◽  
High Dynamic Range ◽  
Field Of View ◽  
Large Field ◽  
General Properties ◽  
Polarization Study ◽  
Rotation Measure ◽  
High Dynamic

AbstractWe discuss the rotation measure properties of the CSS quasar 3C 309.1, determined from high dynamic range, large field of view VLBA images at several frequencies between 1.4 and 15 GHz. We consider the general properties of the ambient medium by considering the structure of the Faraday screen across various parts of the radio source.

scholarly journals Global Daytime Mean Shortwave Flux Consistency Under Varying EPIC Viewing Geometries

2021 ◽  
Vol 2 ◽  
Author(s):  
Wenying Su ◽  
Lusheng Liang ◽  
David P. Duda ◽  
Konstantin Khlopenkov ◽  
Mandana M. Thieman
Keyword(s):  
Radiant Energy ◽  
Energy System ◽  
Field Of View ◽  
Radiation Budget ◽  
Distribution Models ◽  
The Earth ◽  
Imaging Camera ◽  
Earth Radiation Budget ◽  
Mean Square Errors ◽  
Earth Radiation

One of the most crucial tasks of measuring top-of-atmosphere (TOA) radiative flux is to understand the relationships between radiances and fluxes, particularly for the reflected shortwave (SW) fluxes. The radiance-to-flux conversion is accomplished by constructing angular distribution models (ADMs). This conversion depends on solar-viewing geometries as well as the scene types within the field of view. To date, the most comprehensive observation-based ADMs are developed using the Clouds and the Earth’s Radiant Energy System (CERES) observations. These ADMs are used to derive TOA SW fluxes from CERES and other Earth radiation budget instruments which observe the Earth mostly from side-scattering angles. The Earth Polychromatic Imaging Camera (EPIC) onboard Deep Space Climate Observatory observes the Earth at the Lagrange-1 point in the near-backscattering directions and offers a testbed for the CERES ADMs. As the EPIC relative azimuth angles change from 168◦ to 178◦, the global daytime mean SW radiances can increase by as much as 10% though no notable cloud changes are observed. The global daytime mean SW fluxes derived after considering the radiance anisotropies at relative azimuth angles of 168◦ and 178◦ show much smaller differences (<1%), indicating increases in EPIC SW radiances are due mostly to changes in viewing geometries. Furthermore, annual global daytime mean SW fluxes from EPIC agree with the CERES equivalents to within 0.5 Wm−2 with root-mean-square errors less than 3.0 Wm−2. Consistency between SW fluxes from EPIC and CERES inverted from very different viewing geometries indicates that the CERES ADMs accurately quantify the radiance anisotropy and can be used for flux inversion from different viewing perspectives.

scholarly journals Orbiting VLBI: A Survey

1984 ◽  
Vol 110 ◽  
pp. 397-403
Author(s):  
Bernard F. Burke
Keyword(s):  
Very Long Baseline Interferometry ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Limiting Factor ◽  
Space Vehicles ◽  
Radio Telescopes ◽  
Long Baseline ◽  
The Earth ◽  
Effective Aperture ◽  
High Dynamic

The Very-Long-Baseline Interferometry technique is not limited by the size of the Earth. Near-Earth-orbiting space vehicles can carry radio telescopes that can serve as VLBI stations using existing technology. By proper use of ground VLB arrays, a single orbiting VLBI satellite can yield radio maps with 2-dimensional coverage and high dynamic range at all declinations. A single orbiter can be used out to orbits that yield an effective aperture greater than two Earth diameters. Interstellar scintillations are a limiting factor only in the micro-arc-second range.

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