Thermal And Near-infrared Sensor for Carbon Observation - Fourier Transform Spectrometer
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|The Thermal And Near-infrared Sensor for Carbon Observation - Fourier Transform Spectrometer (TANSO-FTS) is one of two instruments that the Thermal And Near-infrared Sensor for Carbon Observation (TANSO) is composed of. It is a four-band interferometer designed to measure infrared light reflected and emitted from the earth's surface and atmosphere. Column abundances of carbon dioxide and methane are calculated from the observational data. Incoming light is split into two beams which propagate in separate optical paths to create an optical path difference. The beams then recombine to cause interference. FTS measures the intensity of interference by continuously changing the optical path length difference. A spectrum is obtained by performing a Fourier transform on the measured data. Light reflected from the earth's surface is observed in the spectral bands 1 through 3 of FTS during daytime, and the light emitted from the atmosphere is captured in band 4 during both day and night time. Prior to reaching the detectors of the instrument, the light in the bands 1 through 3 is split into two orthogonally-polarised components (P and S components) and measured independently. The light in the band 4, however, is not split. The instrument thereby observes the incoming light in seven different channels. The TANSO-FTS instrument operates within four spectral bands in the following wavelength ranges: 0.758-0.775 micrometres (band 1); 1.56-1.72 (band 2); 1.92-2.08 (band 3); 5.56-14.3 (band 4). The intstrument has a spectral resolution of 0.2 cm-1. The angle of instantaneous field of view is 15.8 mrad. Flown on GOSAT. http://www.gosat.nies.go.jp/eng/gosat/page2.htm
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|Atmospheric chemistry remote sensors
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