Design of interference filters for the observation of infra-red emission from atmospheric carbon dioxide by an earth satellite
✍ Scribed by S. D. Smith
- Publisher
- John Wiley and Sons
- Year
- 1961
- Tongue
- English
- Weight
- 270 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0035-9009
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✦ Synopsis
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.