04-02-2016, 20:53
(04-02-2016, 11:09)AllyCat Wrote: However, as I've said before, I don't believe that particular UV sensor actually measures the UV Index "correctly", so it still may give a similar output (as does the FO sensor). At the moment your "UV" sensor seems to be correlating much better with the Visible light than is the Visible/IR sensor!
Regarding this matter, the following text in from the manufacturer of the UV sensor used in the UVM-30A module.
GaN is a new type of semiconductor materials suitable for making high performance UV sensors, which can totally reject visible light due to its wide bandgap. GaN-based UV sensors have the advantages such as small size, high sensitivity, visible blind or even solar blind, low power consumption and long lifetime. Earlier UV sensors are traditionally based on Si. However, since Si photodiode has a strong response to visible light, unwanted output signals will be generated, causing measurement errors. As a result, expensive filter has to be installed in front of the Si photodiode. GaN-based UV sensors can overcome this inherent limitation of Si photodiodes by providing much higher measurement accuracy for UV light.
Source: http://www.gano-uv.com/en/products.asp?b...AsA28P8HAQ