Comparison of Spectral Radiance Calibrations of SBUV-2 Satellite Ozone Monitoring Instruments Using Integrating Sphere and Flat-Plate Diffuser Techniques
1993; IOP Publishing; Volume: 30; Issue: 4 Linguagem: Inglês
10.1088/0026-1394/30/4/008
ISSN1681-7575
AutoresDavid Heath, Zhongying Wei, William K. Fowler, V. W. Nelson,
Tópico(s)Infrared Target Detection Methodologies
ResumoHistorically, flat-plate diffusers of measured angular scattering properties are illuminated by NIST standards of spectral irradiance to provide a calculated spectral radiance standard in the wavelength region 250 nm to 340 nm for space-borne SBUV-2 instruments used to determine long-term changes in stratospheric ozone. Correspondingly, space-borne large-aperture scanning radiometers used to measure spectroradiometric properties of Earth scenes in the red and near-infrared regions have used internally illuminated integrating spheres. The spectral radiance of the aperture of an integrating sphere is calculated from its spectral irradiance which is referenced to NIST standards of spectral irradiance. Spectral radiance calibration constants in the region 250 nm to 340 nm derived using the flat-plate diffuser and spherical integrator techniques agree to within 1% in the wavelength region from 250 nm to 340 nm. The results presented are for the radiometric calibration of the SBUV-2 flight model number two which is the next instrument scheduled for flight.
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