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... > Instruments > Earth Remote Sensing Instruments > Passive Remote Sensing > Spectrometers/Radiometers > Radiometers > Low-Resolution Omnidirectional Radiometer

Preferred term

Low-Resolution Omnidirectional Radiometer  

Definition

  • The TIROS 4 low-resolution omnidirectional radiometer consisted primarily of two sets of bolometers in the form of hollow aluminum hemispheres, mounted on opposite sides of the spacecraft, whose optical axes were parallel to the spin axis. The bolometers were thermally isolated from but in close proximity to reflecting mirrors so that the hemispheres behaved very much like isolated spheres in space. The experiment was designed to measure the amount of solar energy absorbed, reflected, and emitted by the earth and its atmosphere. One bolometer in each set was painted black, and one was painted white. The black bolometer absorbed most of the incident radiation while the white bolometer was sensitive mainly to radiation with wavelengths longer than approximately 4 micrometers. The reflected and emitted radiation could thus be separated. The sensor temperatures were measured by thermistors fastened to the inside of the hollow hemisphere. The sensor temperatures, taken every 29 sec, were an average of the two temperatures from the matched thermistors. The experiment was a success, and usable data were received from February 8, 1962, to June 28, 1962. Identical experiments were flown on TIROS 3 and 7, and a simliar one was carried on Explorer 7. (en)

Broader concept

Change note

  • 2021-03-11 09:11:23.0 [tstevens] Insert Concept add broader relation (Low-Resolution Omnidirectional Radiometer [b6e5de1f-95ea-471f-8a89-75fc3c15a470,560914] - Radiometers [5b753e40-b3f1-426a-8d92-ffee1d675468,544211]);
  • 2021-03-11 09:14:59.0 [tstevens] insert Definition (id: null text: The TIROS 4 low-resolution omnidirectional radiometer consisted primarily of two sets of bolometers in the form of hollow aluminum hemispheres, mounted on opposite sides of the spacecraft, whose optical axes were parallel to the spin axis. The bolometers were thermally isolated from but in close proximity to reflecting mirrors so that the hemispheres behaved very much like isolated spheres in space. The experiment was designed to measure the amount of solar energy absorbed, reflected, and emitted by the earth and its atmosphere. One bolometer in each set was painted black, and one was painted white. The black bolometer absorbed most of the incident radiation while the white bolometer was sensitive mainly to radiation with wavelengths longer than approximately 4 micrometers. The reflected and emitted radiation could thus be separated. The sensor temperatures were measured by thermistors fastened to the inside of the hollow hemisphere. The sensor temperatures, taken every 29 sec, were an average of the two temperatures from the matched thermistors. The experiment was a success, and usable data were received from February 8, 1962, to June 28, 1962. Identical experiments were flown on TIROS 3 and 7, and a simliar one was carried on Explorer 7. language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/b6e5de1f-95ea-471f-8a89-75fc3c15a470

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