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Dayglow photometry: a new approach

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Abstract

A unique photometer capable of measuring line intensities of <0.1% of the bright background continuum (5 × 106/Å) has been developed and successfully commissioned for the measurement of daytime OI 630.0-nm emission from the thermosphere. The photometer employs a low resolution (104) Fabry-Perot etalon, temperature tuned narrowband (3-Å) interference filter, radial chopper, and up/down counting system. The optimum choice of the photometer parameters and a unique method of eliminating the background enabled us to overcome the limitations of the earlier attempts to make measurements on such phenomena as dayglow and has opened up a wide range of uses. However, at present, it is being discussed only in the context of dayglow measurements.

© 1989 Optical Society of America

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