What does the sun-a-wear sensor measure?
The sun-a-wear sensor measures the UV index at irregular intervals. That depends on how much light reaches its solar cell. When the sensor is in the sun, it measures every 5 seconds. In the shade it does this about every 20 seconds. The sun-a-wear app adds up the measurements to one UV dose.
Measurement precision of the sun-a-wear sensor
We test and calibrate the sensors using a high-precision reference sensor. In comparison, our sensor has a deviation of approx. 10 to 15 %. That might sound like a lot. If you look at the measurements, one on top of the other, you can see that they are very similar. The more important part for sun-a-wear is the further processing of the data. With this further processing, we can improve the measurement using other data in order to better estimate a person's actual UV exposure. The graph below shows a comparison of a sun-a-wear sensor (blue) with the reference sensor (red).
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