Acousto-optic measurements of tropospheric nitrogen dioxide column density by solar spectroscopy
Measurements of column densities of atmospheric gases can be achieved by a solar spectroscopic method that uses differential optical absorption spectroscopy. Because of the scintillation of sunlight intensity in the atmosphere, the variation in intensity will introduce a low-frequency modification o...
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| Published in | Applied optics (2004) Vol. 44; no. 26; p. 5536 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
10.09.2005
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| Online Access | Get more information |
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| Summary: | Measurements of column densities of atmospheric gases can be achieved by a solar spectroscopic method that uses differential optical absorption spectroscopy. Because of the scintillation of sunlight intensity in the atmosphere, the variation in intensity will introduce a low-frequency modification of the measured solar spectrum. A spectral capturing-type CCD spectrometer takes milliseconds to capture a solar spectrum, and the effect of sunlight scintillation is negligible. In contrast, without scintillation correction, a scanning-type spectrometer spending minutes to obtain a complete solar spectrum will introduce some amount of errors. We demonstrate an intensity-compensation technique in a scanning-type spectrometer, based on a solid-state acousto-optic tunable filter, for solar spectroscopic measurements. |
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| ISSN: | 1559-128X |
| DOI: | 10.1364/AO.44.005536 |