Apogee MU-100 Руководство пользователя - Страница 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 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

). 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.