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Proceedings Paper

MODIS onboard calibrator blackbody performance
Author(s): Joe Bauer; John A. Mehrten; James B. Young
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Paper Abstract

The MODIS will be one of the primary instruments observing the earth on the EOS scheduled for launch in 1999. The on orbit radiometric calibration requirement for 3.5 micrometers to 14.3 micrometers spectral region is 1 percent with the sea surface bands at 0.5 percent. The on board calibrator blackbody (OBC BB) has a V groove cavity construction with polished low reflectance surfaces which provides an effective cavity emittance of 0.997 which has been characterized with a ground calibration blackbody system having an emittance > 0.999. The OBC BB provides an on orbit end to end system level radiometric calibration. Normally it operates at MODIS ambient temperature with a secondary mode of being heated to 315 K and then transitioning to ambient. Its temperature is monitored with 12 glass encapsulated thermistors whose initial temperature calibration is within 0.013 K traceable to NIST standards. The standard deviation of the 12 sensors during the cool down transition varies between 0.08 to 0.03 K with a weighted effective standard deviation of 0.042 K. The temperature profile will be graphically illustrated temporally and spatially. The relationship of MODIS viewing geometry related to BB is illustrated.

Paper Details

Date Published: 3 October 1998
PDF: 8 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325633
Show Author Affiliations
Joe Bauer, Raytheon Systems Co. (United States)
John A. Mehrten, Raytheon Systems Co. (United States)
James B. Young, Raytheon Systems Co. (United States)

Published in SPIE Proceedings Vol. 3439:
Earth Observing Systems III
William L. Barnes, Editor(s)

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