1 / 11

UVI Sensor

UVI Sensor. A device for real-time measurement s of UV Index. Dr. Alan Bates Department of Mathematics, Natural Science and Computer Science John Cabot University Via della Lungara 233 00165 Rome, Italy. Why measure UVI?.

tworkman
Download Presentation

UVI Sensor

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. UVI Sensor A device for real-time measurements of UV Index Dr. Alan Bates Department of Mathematics, Natural Science and Computer Science John Cabot University Via della Lungara 233 00165 Rome, Italy

  2. Why measure UVI? • Skin cancers rates are increasing significantly since 1970s particularly among fair-skinned people (+4% per year in the US) • Skin aging is accelerated with increased exposure to UV • Strong reflection from surfaces (sand, water and snow) can cause damage to the eyelids and eyeball tissues • Level of awareness of the potential risks of UV exposure is generally low

  3. WHO Protection Scheme Recommended sun protection scheme

  4. Calculating UVI • Eλ is the solar spectral irradiance (measure of solar spectrum transmitted through atmosphere) – varies by day, season and latitude. Can be measured with a spectrometer • Ser(λ) is the erythema reference action spectrum for human fair skin. ker is a constant equal to 40 m2/W • UVA (315–400 nm); UVB (280–315 nm); UVC (100–280 nm)

  5. Existing UV sensors ML8511 (Lapis Semiconductor) • The sensor outputs an analog voltage that is linearly related to the overall UV intensity, 280-390 nm • The output is a summation of contributions from all UV wavelengths - a type of average value • Advantages: fast real-time measurements; small in size; requires little power • Disadvantage: approximate value of UVI

  6. Si1132 (Silicon Labs) • Sensor measures visible and IR intensities • Algorithm calculates UV index • Advantages: fast real-time measurements; small in size; requires little power • Disadvantage: +/- 1 difference compared to actual UV index

  7. The Idea! Accurate calibration under various atmospheric conditions/UVI values is re • Notice for both sensors the UVI values are approximate • We need a fast and accurate measurement of the UVI • Utilize UV spectrometer to measure actual real-time UVI values under various conditions (UV spectrometers are expensive) • Simultaneously record output from the ML8511 with the Arduino microcontroller • Write algorithm to relate ML8511 output to actual UVI value in real-time under a wide range of atmospheric conditions

  8. Displaying UVI UVI values on a LCD display with WHO recommendations Light with colors corresponding to WHO recommendations Sound alarm if UV Index is above a certain value, for example index 8 or above Online internet site

  9. 2 Sensor Types • Wall-mounted for public display in schools, outdoor workplaces and public institutions involving outdoor work to communicate UV Index • Wearable to fit on clothing to measure personal UV Index

  10. UVI Network Connect Real-time measurement • Sensor connected to internet to stream live data to online map • Updated every minute • Accurate measurement of UV Index across country, regions and provinces

  11. Grazie!

More Related