11 December 2008 Radiometric calibration accuracy of GOSAT-TANSO-FTS (TIR) relating to CO2 retrieval error
Author Affiliations +
Abstract
Radiometric calibration accuracy of 0.3 K in Tbb is necessary to retrieve CO2 concentration profile with accuracy of 1 % in the upper atmosphere. In case of the thermal infrared (TIR) band (band 4) of GOSAT-TANSO-FTS, interferometric phase correction procedure is very important because the total transmittance of the optics at the band is about 70 % because of opacity of dichroic mirrors of band 1-3 placed obstructing the field of view of band 4, and the mirrors reflect the radiation emitted from inside of the optics. Based on the results from the thermal vacuum tests (TVTs) of the sensor, it is found that interferometric signal is almost zero when the sensor view a target of which temperature is about 280- 300K because the radiation emitted from inside of the spectrometer controlled at about 296 K has completely opposite phase to that of the target. It is also found that the interferometric final phase of the calibrated signal varies when the total signal is almost zero because of weak signals that have phases differ from both of those of targets and calibrators. A candidate phase correction procedure is proposed based on that adopted for a previous space FTS sensor, IMG/ADEOS. Non-linearity correction for the detector and polarization efficiency correction are also desccussed.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ryoichi Imasu, Ryoichi Imasu, Naoko Saitoh, Naoko Saitoh, Yosuke Niwa, Yosuke Niwa, Hiroshi Suto, Hiroshi Suto, Akihiko Kuze, Akihiko Kuze, Kei Shiomi, Kei Shiomi, Masakatsu Nakajima, Masakatsu Nakajima, } "Radiometric calibration accuracy of GOSAT-TANSO-FTS (TIR) relating to CO2 retrieval error", Proc. SPIE 7149, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications II, 71490B (11 December 2008); doi: 10.1117/12.806145; https://doi.org/10.1117/12.806145
PROCEEDINGS
8 PAGES


SHARE
RELATED CONTENT

The Primordial Inflation Explorer (PIXIE)
Proceedings of SPIE (August 02 2014)
The Primordial Inflation Explorer (PIXIE)
Proceedings of SPIE (July 29 2016)
SOFIE instrument ground calibration
Proceedings of SPIE (September 07 2006)
An Infrared Scanning Radiometer And Its Applications
Proceedings of SPIE (April 01 1990)
Unconventional Processing In Interferometry
Proceedings of SPIE (October 29 1981)

Back to Top