More accurate measurement of
ultraviolet rays may now be possible
with the development in Britain of a
new photodiode detector.
UV radiation is the most energetic form of optical radiation and
exposure to it is potentially hazardous. Accurate measurement of
the LTV radiations from the sun has
been made difficult by the presence
of significantly large amounts of visible and infrared radiation.
Optical radiation is detected by a
photodiode when an electron is
excited across an energy gap. The
new detector uses silicon carbide
whose energy gap is such that only
the UVrays have enough energy to
excite an electron across the gap, say
researchers.
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