Fog Computing Based Ultraviolet Radiation Measurement via Smartphones

Ultraviolet (UV) radiation has a great impact on human health. Nowadays, the public basically gets information about UV radiance through weather forecasts. However, weather forecasts just provide rough and average predication for a certain large region. Since CMOS sensors in mobile phone cameras are very sensitive to UV, mobile phones have potential to be ideal equipment to measure UV radiance. This paper introduced a method that can measure UV radiance by just using mobile phone cameras. In addition, by utilizing fog computing, results can be gathered and amended locally through fog server to provide relatively accurate UV measurement. In this paper, advantages of using mobile phones to do UV measurement were discussed at first. Then, theoretical foundations were meticulously illustrated. Later, a procedure that can be implemented in mobile phones was provided. Furthermore, an Android app called UV Meter was developed based on the procedure. At last, verification was conducted under different weather conditions. Results showed that the procedure is valid and can be easily implemented onto mobile phones for everyday UV measurement.