Smartphone based Android app for determining UVA aerosol optical depth and direct solar irradiances

Igoe, Damien P. and Parisi, Alfio and Carter, Brad (2014) Smartphone based Android app for determining UVA aerosol optical depth and direct solar irradiances. Photochemistry and Photobiology, 90 (1). pp. 233-237. ISSN 0031-8655

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Abstract

This research describes the development and evaluation of the accuracy and precision of an Android app specifically designed, written and installed on a smartphone for detecting and quantifying incident solar UVA radiation and subsequently, aerosol optical depth at 340 nm and 380 nm. Earlier studies demonstrated that a smartphone image sensor can detect UVA radiation and the responsivity can be calibrated to measured direct solar irradiance. This current research provides the data collection, calibration, processing, calculations and display all on a smartphone. A very strong coefficient of determination of 0.98 was achieved when the digital response was recalibrated and compared to the Microtops sunphotometer direct UVA irradiance observations. The mean percentage discrepancy discrepancy for derived direct solar irradiance was only 4% and 6% for observations at 380 nm and 340 nm respectively, lessening with decreasing solar zenith angle. An 8% mean percent difference discrepancy was observed when comparing aerosol optical depth, also decreasing as solar zenith angle decreases. The results indicate that a specifically designed Android app linking and using a smartphone image sensor, calendar and clock, with additional external narrow bandpass and neutral density filters can be used as a field sensor to evaluate both direct solar UVA irradiance and low aerosol optical depths for areas with low aerosol loads.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Wiley Periodicals. Accepted version deposited in accordance with the copyright policy of the publisher. Article first published online: 25 NOV 2013
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 27 Apr 2014 12:51
Last Modified: 16 Mar 2015 22:29
Uncontrolled Keywords: aerosols; smartphone; direct UV; UVA; UV
Fields of Research : 02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1111/php.12185
URI: http://eprints.usq.edu.au/id/eprint/24984

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