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Instrument: OCTS : Ocean Color and Temperature Scanner
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OCTS is an optical radiometer devoted to the frequent global
measurement of ocean color and sea surface temperature. OCTS will show
the amount of chlorophyll and dissolved substances in the water, and
temperature distribution. OCT's data will be used for determination of
ocean primary production and carbon cycle, and be used for getting the
information of ocean conditions for fishery and environment monitoring
etc. OCTS is a successor to CZCS(Coastal Zone Color Scanner), the
U.S. projects, which was the first real optical sensor for ocean
observation onboard NIMBUS-7 launched in 1978.

OCTS has 8 bands in visible and near-infrared region and 4 bands in
thermal region, and achieves highly sensitive spectral measurement
with these bands. The observation bands are determined on the
characteristics of spectral reflectance of the object substances,
atmosheric windows and atmospheric correction. The spatial resolution
is about 700m. This is applicable to the observation of coastal zone
and land, the feature of these area baries quickly compared to the
open ocean. As the swathwidth is about 1400km on the ground, OCTS can
observe the same area every 3 days and can monitor rapidly changing
phenomena. OCTS has optical calibration function using solar light and
halogen lamp as the calibration source. OCTS has two data trasmission
modes. All raw pixel data are transmitted through X band with fine
data transmission mode. One pixel data is sampled from every 6x6km
area as typical data of the area and is transmitted at UHF band in
coarse data transmission mode.

OCTS consists of scanning radiometer unit, which contains optical
system and detector module, and-electrical unit. OCTS adopts catoptric
optical system and mechanical rotating scanning method using
mirror. this is because OCTS covers wide range of wavelength and wide
scanning angles. OCTS can tilt its line of sight along the track to
prevent the sunglitter at the sea surface from interrupting the
observation. For high sensitivity, each band has 10pixels aligned to
the track. The infrared detectors are cooled at 100k by a large
rediant cooler facing the deep space.

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