Nighttime measurements of atmospheric optical thickness by star photometry with a digital camera
Applied Optics, Vol. 46, Issue 22, pp. 5176-5182 (2007)
http://dx.doi.org/10.1364/AO.46.005176
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Abstract
Nighttime stellar photometric measurements have been carried out with a commercial digital single-lens reflex camera to determine the atmospheric optical thickness on large fields of view (FOV). Specific procedures of image analysis allow to extract an equivalent irradiance for a number of stars and for the sky light background; thus, a measure of the optical thickness in each star direction can be retrieved. A larger FOV is obtained by stitching several photographs shot in quick sequence on adjacent regions of the sky: such measurements provide almost instantaneous maps of optical thickness and skylight background that indicate the degree of homogeneity of the aerosol load. Additional information provided by the combined use of the camera and a lidar is presented. The zenithal optical thickness is used with values of the aerosol backscatter provided by a lidar system to obtain the aerosol extinction-to-backscatter ratio.
© 2007 Optical Society of America
OCIS Codes
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(010.3640) Atmospheric and oceanic optics : Lidar
(040.1490) Detectors : Cameras
(100.2000) Image processing : Digital image processing
(280.1120) Remote sensing and sensors : Air pollution monitoring
ToC Category:
Atmospheric and Oceanic Optics
History
Original Manuscript: October 3, 2006
Revised Manuscript: March 29, 2007
Manuscript Accepted: March 31, 2007
Published: July 9, 2007
Citation
Orietta Lanciano and Giorgio Fiocco, "Nighttime measurements of atmospheric optical thickness by star photometry with a digital camera," Appl. Opt. 46, 5176-5182 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-22-5176
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