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Design of interference filters for the observation of infra‐red emission from atmospheric carbon dioxide by an earth satellite
Author(s) -
Smith S. D.
Publication year - 1961
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708737315
Subject(s) - interference filter , interference (communication) , optics , filter (signal processing) , sensitivity (control systems) , noise (video) , interferometry , satellite , physics , energy (signal processing) , environmental science , remote sensing , materials science , computer science , telecommunications , electrical engineering , electronic engineering , geology , engineering , quantum mechanics , wavelength , channel (broadcasting) , astronomy , artificial intelligence , image (mathematics)
Abstract Detailed proposals are made for the design of a high‐order Fabry‐Perot type interference filter in which the transmission bands of the filter are exactly matched to 15 lines of the R ‐branch of the CO 2 spectrum near 15 μ. The striking energy advantages of such an interferometer are discussed and it is shown that use of an optically worked high‐index germanium spacer leads to a further considerable increase in light grasp. It is concluded that technical problems are not severe and a calculation of the energy that can be collected by the proposed system suggests that a detector of area 9 mm 2 with a noise‐equivalent‐power of 10 −10 watts (i.e. comparable with a standard Golay cell) can provide adequate sensitivity.