Apogee SE-421 Gebruikershandleiding - Pagina 4
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INTRODUCTION
Ultraviolet (UV) radiation constitutes a portion of the electromagnetic spectrum from 100 to 400 nm and is further
subdivided into three wavelength ranges: UV-A (315 to 400 nm), UV-B (280 to 315 nm), and UV-C (100 to 280 nm).
Much of the UV-B and all of the UV-C wavelengths from the sun are absorbed by Earth's atmosphere. There are
also multiple artificial UV light sources available.
Most UV sensors designed for sunlight measurements are sensitive to UV radiation in the UV-A or UV-B ranges.
Apogee Instruments SU-200 series UV-A sensors detect UV radiation from 300 to 400 nm and are calibrated in
-2
energy flux density units of watts per square meter (W m
, equal to Joules per second per square meter). The
-2
-
output can also be expressed in photon flux density units of micromoles per square meter per second (µmol m
s
1
).
Typical applications of UV sensors include incoming UV radiation measurement in outdoor environments or in
laboratory use with artificial light sources (e.g., germicidal lamps).
Apogee Instruments SU-200 series UV-A sensors consist of a cast acrylic diffuser, photodiode, and signal processing
circuitry mounted in an anodized aluminum housing and a cable to connect the sensor to a measurement device.
SU-200 sensors are designed for continuous UV-A radiation measurement in indoor or outdoor environments. The
SU-200 series outputs an analog voltage that is directly proportional to UV-A radiation incident on a planar surface
(does not have to be horizontal) where the radiation emanates from all angles of a hemisphere. SU-221 sensors
output a digital signal using SDI-12 communication protocol.