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Title:
Halogen Occultation Experiment (HALOE) optical filter characterization
Authors:
Harvey, Gale A.
Affiliation:
AA(National Aeronautics and Space Administration. Langley Research Center, Hampton, VA.)
Publication:
Unknown
Publication Date:
00/1989
Category:
Instrumentation and Photography
Origin:
STI
NASA/STI Keywords:
Artificial Satellites, Halogen Occultation Experiment, Optical Filters, Upper Atmosphere, Fabry-Perot Spectrometers, Fourier Transformation, Infrared Spectrometers, Stellar Occultation
Bibliographic Code:
1989STIN...8919529H

Abstract

The Halogen Occultation Experiment (HALOE) is a solar occultation experiment that will fly on the Upper Atmosphere Research Satellite to measure mixing ratio profiles of O3, H2O, NO2, NO, CH4, HCl, and HF. The inversion of the HALOE data will be critically dependent on a detailed knowledge of eight optical filters. A filter characterization program was undertaken to measure in-band transmissions, out-of-band transmissions, in-band transmission shifts with temperature, reflectivities, and age stability. Fourier Transform Infrared Spectrometers were used to perform measurements over the spectral interval 400/cm to 6300/cm (25 micrometers to 1.6 micrometers). Very high precision (0.1 percent T) in-band measurements and very high resolution (0.0001 percent T) out-of-band measurements have been made. The measurements revealed several conventional leaks at 0.01 percent transmission and greatly enhanced (1,000) leaks to the 2-element filters when placed in a Fabry-Perot cavity. Filter throughput changes by 5 percent for a 25 C change in filter temperature.
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Database: Astronomy
Physics
arXiv e-prints