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How is UV Radiation measured?
 The
standard equipment for measuring the intensity of UV (ultraviolet) radiation
at different wavelengths needed for calculating the UV Index is the spectrophotometer.
This is very expensive. In its place, a widely used and inexpensive instrument
for measuring the intensity of the UV radiation is the broadband UV sensor.
This type of sensor has a response which approximates the erythemal
action spectrum. The UV Index is obtained by multiplying the measured UV
intensity by a conversion factor. The Hong Kong Observatory deploys such a broadband
UV sensor at its King's Park Meteorological Station.
The Hong Kong Observatory's broadband
UV sensor
at its King's Park Meteorological Station
 
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