Apogee MU-100 Manuel du propriétaire - Page 4

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Apogee MU-100 Manuel du propriétaire
4

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 the Earth's atmosphere. There are also many artificial UV
light sources available that output a select wavelength range or offer a broadband UV radiation source.
Most UV sensors designed for sunlight measurements are sensitive to UV radiation in the UV-A and UV-B ranges. Apogee
Instruments MU series meters detect UV radiation from 250 to 400 nm and are calibrated in photon flux density units of
micromoles per square meter per second (µmol m
s
). The output can also be expressed in energy flux units of watts per
-2
-1
square meter (W m
-2
, equal to Joules per second per square meter).
Typical applications of UV meters include incoming UV radiation measurement in outdoor environments or in laboratory use
with artificial light sources (e.g., germicidal lamps).
Apogee Instruments MU series UV meters consist of a handheld meter and a dedicated sensor that is integrated into the top
of the meter housing (MU-100) or connected by cable to an anodized aluminum housing (MU-200). Integrated and separate
sensors consist of a photodiode and filter, and are potted solid with no internal air space. MU series meters provide a real-
time photon flux or energy flux (menu selectable) reading on the LCD display that determines the UV radiation incident on a
planar surface (does not have to be horizontal), where the radiation emanates from all angles of a hemisphere. MU series
meters include manual and automatic data logging features for making spot-check measurements or calculating integrated
daily total values.