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A Camera Phone-Based UV-Dosimeter for Monitoring the Solar Disinfection (SODIS) of Water

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3 Author(s)
Copperwhite, R. ; Nat. Centre for Sensor Res. (NCSR), Dublin City Univ. (DCU), Dublin, Ireland ; McDonagh, C. ; O'Driscoll, S.

In this letter, we report on the development of a novel camera phone-based UV-dosimeter for monitoring the solar disinfection (SODIS) of water. The dosimeter consists of a UV indicator, methylene blue, dispersed in an ethylcellulose-based polymer matrix. To provide quantitative measurement of UV dose, we demonstrate the use of a camera phone to analyze dosimeter color change in response to UV exposure. The dosimeter response exhibits excellent agreement with a polynomial model (R2) >; 0.99) over the UV exposure range tested. A notable advantage of the dosimeter described here is that it can be deposited on a variety of substrates with the potential to be incorporated into water containers. It is envisaged that use of such a dosimeter in conjunction with mobile phone technology will enhance the use of SODIS thereby impacting significantly on the challenge of providing clean drinking water in developing regions of the world.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 5 )