Igoe, Damien and Parisi, Alfio and Carter, Brad (2012) Characterization of a smartphone camera's response to ultraviolet A radiation. Photochemistry and Photobiology . ISSN 0031-8655 (In Press)
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Identification Number or DOI: doi: 10.1111/j.1751-1097.2012.01216.x
As part of a wider study into the use of smartphones as solar ultraviolet radiation monitors, this article characterizes the ultraviolet A (UVA; 320-400 nm) response of a consumer complementary metal oxide semiconductor (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. A smartphone camera image of an ultraviolet-A (UV-A) beam from an irradiation monochromator. The smartphone camera CMOS sensor can detect the UV-A irradiance, providing measurable responses from the red, green and blue pixels. The addition of neutral density and narrow bandpass filters ensure that the UV irradiance do not cause saturation within the smartphone image sensor.
|Item Type:||Article (Commonwealth Reporting Category C)|
|Additional Information:||Published online 13 Sep 2012. Permanent restricted access to ArticleFirst version in accordance with the copyright policy of the publisher.|
|Uncontrolled Keywords:||monitoring; smartphone; UVA; ultraviolet radiation|
|Fields of Research (FOR2008):||09 Engineering > 0906 Electrical and Electronic Engineering > 090605 Photodetectors, Optical Sensors and Solar Cells|
03 Chemical Sciences > 0307 Theoretical and Computational Chemistry > 030702 Radiation and Matter
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
|Socio-Economic Objective (SEO2008):||C Society > 92 Health > 9204 Public Health (excl. Specific Population Health) > 920405 Environmental Health|
|Deposited On:||27 Sep 2012 13:02|
|Last Modified:||13 Dec 2012 15:39|
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