Imaging Multi-Order Fabry-Perot Spectrometer (IMOFPS) for spaceborne measurements of CO

Brian R Johnson; Thomas U. Kampe; William B. Cook; Grzegorz Miecznik; Paul C. Novelli; Hilary E. Snell; Jennifer A. Turner-Valle

doi:10.1117/12.506147

3 November 2003 Imaging Multi-Order Fabry-Perot Spectrometer (IMOFPS) for spaceborne measurements of CO

Brian R Johnson, Thomas U. Kampe, William B. Cook, Grzegorz Miecznik, Paul C. Novelli, Hilary E. Snell, Jennifer A. Turner-Valle

Author Affiliations +

Proceedings Volume 5157, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V; (2003) https://doi.org/10.1117/12.506147
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

An instrument concept for an Imaging Multi-Order Fabry-Perot Spectrometer (IMOFPS) has been developed for measuring tropospheric carbon monoxide (CO) from space. The concept is based upon a correlation technique similar in nature to multi-order Fabry-Perot (FP) interferometer or gas filter radiometer techniques, which simultaneously measure atmospheric emission from several infrared vibration-rotation lines of CO. Correlation techniques provide a multiplex advantage for increased throughput, high spectral resolution and selectivity necessary for profiling tropospheric CO. Use of unconventional multilayer interference filter designs leads to improvement in CO spectral line correlation compared with the traditional FP multi-order technique, approaching the theoretical performance of gas filter correlation radiometry. In this implementation, however, the gas cell is replaced with a simple, robust solid interference filter. In addition to measuring CO, the correlation filter technique can be applied to measurements of other important gases such as carbon dioxide, nitrous oxide and methane. Imaging the scene onto a 2-D detector array enables a limited range of spectral sampling owing to the field-angle dependence of the filter transmission function. An innovative anamorphic optical system provides a relatively large instrument field-of-view for imaging along the orthogonal direction across the detector array. An important advantage of the IMOFPS concept is that it is a small, low mass and high spectral resolution spectrometer having no moving parts. A small, correlation spectrometer like IMOFPS would be well suited for global observations of CO₂, CO, and CH₄ from low Earth or regional observations from Geostationary orbit. A prototype instrument is in development for flight demonstration on an airborne platform with potential applications to atmospheric chemistry, wild fire and biomass burning, and chemical dispersion monitoring.

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Brian R Johnson, Thomas U. Kampe, William B. Cook, Grzegorz Miecznik, Paul C. Novelli, Hilary E. Snell, and Jennifer A. Turner-Valle "Imaging Multi-Order Fabry-Perot Spectrometer (IMOFPS) for spaceborne measurements of CO", Proc. SPIE 5157, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V, (3 November 2003); https://doi.org/10.1117/12.506147

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