Characterization of the Wind Imaging Interferometer

C. H. Hersom; G. G. Shepherd

doi:10.1364/AO.34.002871

Applied Optics
Vol. 34,
Issue 16,
pp. 2871-2879
(1995)
•https://doi.org/10.1364/AO.34.002871

Characterization of the Wind Imaging Interferometer

C. H. Hersom and G. G. Shepherd

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C. H. Hersom and G. G. Shepherd, "Characterization of the Wind Imaging Interferometer," Appl. Opt. 34, 2871-2879 (1995)

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Abstract

The Wind Imaging Interferometer is a field-widened Michelson interferometer onboard the Upper Atmosphere Research Satellite. The characterization of the instrument required a pixel-by-pixel evaluation of the instrument performance. Some of the configurations, techniques, and results of the characterization are summarized. Throughput was excellent and equivalent to a total system quantum efficiency of ∼10%. Localized spatial noise in response has been attributed to scattering from residual surface effects on the CCD. Instrument visibility factors greater than 90% were measured with distinct distribution patterns over the field of view that were different for the night and day apertures. The instrument phase for zero wind was determined with laboratory airglow sources.

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Test	Purpose	Results
Transmittance	To determine absolute transmittance of each interference filter for each aperture position at the wavelength of interest over the entire field of view.	Images of transmittance generated for the CDB to allow instrument response to be converted to apparent radiance; see Fig. 1 for an example.
Responsivity	To determine the response of the instrument to known radiance inputs for each of the filters and also each aperture position over the entire field of view.	Images of responsivity generated for the CDB to allow instrument response to be converted to apparent radiance; see Fig. 2 for an example.
Visibility	To determine the instrument contribution to line broadening for each wavelength of interest for each aperture position over the entire field of view.	Images of instrument visibility generated for the CDB to allow correction of measured line shape to actual line shape; see Fig. 3 for an example.
Zero wind	To determine the difference in instrument phase between observed atmospheric emissions at rest and corresponding calibration lamps for each aperture.	Images of instrument visibility generated for the CDB to correct measured to actual line shapes; see Fig. 4 for an example.

Parameter	Characterization		System Accuracy

	Budget	Actual	Relative	Scientific Units
Emission rate	2.4%	2.2%	6%	6%
Temperature	0.6%	0.5%	2.0%	25 K
Wind	0.9°	0.5°	1.4°	15 ms⁻¹

Test	Purpose	Results
Transmittance	To determine absolute transmittance of each interference filter for each aperture position at the wavelength of interest over the entire field of view.	Images of transmittance generated for the CDB to allow instrument response to be converted to apparent radiance; see Fig. 1 for an example.
Responsivity	To determine the response of the instrument to known radiance inputs for each of the filters and also each aperture position over the entire field of view.	Images of responsivity generated for the CDB to allow instrument response to be converted to apparent radiance; see Fig. 2 for an example.
Visibility	To determine the instrument contribution to line broadening for each wavelength of interest for each aperture position over the entire field of view.	Images of instrument visibility generated for the CDB to allow correction of measured line shape to actual line shape; see Fig. 3 for an example.
Zero wind	To determine the difference in instrument phase between observed atmospheric emissions at rest and corresponding calibration lamps for each aperture.	Images of instrument visibility generated for the CDB to correct measured to actual line shapes; see Fig. 4 for an example.

Parameter	Characterization		System Accuracy

	Budget	Actual	Relative	Scientific Units
Emission rate	2.4%	2.2%	6%	6%
Temperature	0.6%	0.5%	2.0%	25 K
Wind	0.9°	0.5°	1.4°	15 ms⁻¹

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Applied Optics