Optical radiation sensors

General description:

Solar and sky radiation:
The spectral range spans over shorter wave lengths at 300 nm 
(UV-B) to longer wave length at 5000 nm (IR). 
The solar and sky radiation is the complete direct or 
diffuse sun radiation striking the earth’s surface.

UVA-radiation:
The UV-radiation of longer wave length (more than 313 nm) reaches the earth’s surface almost unfiltered, browns the human skin and enforces the immune system. In solariums the biological effect of the UVA-spectrum combined with other spectral ranges is used to take advantage of the direct pigmenting (melanin colouring). However, radiation which is too strong will harm the connective tissue and supports aging of the skin.

UVB-radiation:
The UV-range of short wave lengths (below 313 nm) can cause irreversible defects to human skin, summarized in the recommendation of the CIE. The UV-index is a popular measure for the sunburn-sensitivity. Directly or compared to other spectral ranges, the measured values inform about biologically and medically relevant relationships. 

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