Characterization of a smartphone camera's response to ultraviolet A radiation

Igoe, Damien and Parisi, Alfio and Carter, Brad (2013) Characterization of a smartphone camera's response to ultraviolet A radiation. Photochemistry and Photobiology, 89 (1). pp. 215-218. ISSN 0031-8655

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Abstract

As part of a wider study into the use of smartphones as solar ultraviolet radiation monitors, this paper characterises the ultraviolet A (UVA)(320-400 nm) response of a consumer CMOS based smartphone image sensor in a controlled laboratory environment. The CMOS image sensor in the camera possesses inherent sensitivity to UVA, and despite the attenuation due to the lens and neutral density and wavelength-specific bandpass filters, the measured relative UVA irradiances relative to the incident irradiances range from 0.0065% at 380 nm to 0.0051% at 340 nm. In addition, the sensor demonstrates a predictable response to low-intensity discrete UVA stimuli that can be modelled using the ratio of recorded digital values to the incident UVA irradiance for a given automatic exposure time, and resulting in measurement errors that are typically less than 5%. Our results support the idea that smartphones can be used for scientific monitoring of UVA radiation.

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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.
Faculty / Department / School:	Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited:	15 May 2013 05:20
Last Modified:	10 Jul 2014 23:57
Uncontrolled Keywords:	UVA; skin cancer; smartphone; solar; monitor
Fields of Research :	02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified 09 Engineering > 0906 Electrical and Electronic Engineering > 090605 Photodetectors, Optical Sensors and Solar Cells 04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
Socio-Economic Objective:	E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI:	10.1111/j.1751-1097.2012.01216.x
URI:	http://eprints.usq.edu.au/id/eprint/22779

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