Alternative blackbody configurations for infrared calibration of future GOES imagers and sounders

Computer Science – Sound

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

The Imagers and the Sounders on the present generation of GOES spacecraft each have a full-aperture blackbody for on-board infrared (IR) calibration. Each instrument interrupts its Earth-viewing operations at regular intervals and views this blackbody by rotating its scan mirror. IR Radiation from this blackbody follows the same path through the entire optical train as radiation from the Earth. The instrument also observes space to measure background generated by the instrument. The difference between signals from the blackbody and from space is used in conjunction with the measured temperature of the blackbody to compute the gain for each IR channel of the instrument. The GIFTS is an experimental, next-generation IR sounder with a Michelson interferometer. It performs on-board gain calibration by sequentially viewing two internal blackbodies that operate at different temperatures, measuring the difference between the resultant signals. A flip mirror is used to insert the blackbodies into the optical beam after the beam has been converged by the telescope. The apertures of the GIFTS blackbodies are much smaller than that of the telescope. This approach allows the blackbodies to have deep cavities and minimizes the time lag and the momentum disturbance in the calibration process. On the other hand, GIFTS is unable to directly measure long-term changes in the throughput of the optical elements that are not included in the calibration path: the scan mirror and two telescope mirrors. The GIFTS approach is capable of high radiometric precision, but requires augmentation by occasional end-to-end IR calibration measurements to achieve the required absolute accuracy over the lifetime of an operational GOES mission.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Alternative blackbody configurations for infrared calibration of future GOES imagers and sounders does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Alternative blackbody configurations for infrared calibration of future GOES imagers and sounders, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alternative blackbody configurations for infrared calibration of future GOES imagers and sounders will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1128701

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.