Apogee Instruments SU-300-SS Gebruikershandleiding - Pagina 14
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UV-I/UV-B Measurements and Spectral Errors
Apogee Instruments model SU-300 UV-I/UV-B sensors are calibrated to measure ultraviolet radiation from the sun
between 300 and 400 nm in Watts per square meter. In addition to naturally occurring UV-I/UV-B radiation from
the sun, there are many electric light sources that emit UV-I/UV-B radiation (e.g., cool white fluorescent, metal
halide, mercury arc, and germicidal lamps). Although the relative wavelengths of UV-I/UV-B radiation differ among
sunlight and electric lights, the error estimates shown in the table below indicate the SU-200 provides reasonable
estimates of UV-I/UV-B radiation coming from electric lamps (table provides spectral error estimates for UV-I/UV-B
radiation measurements from radiation sources other than clear sky solar radiation). For most common lamps, the
error is less than 10 %. The SU-300 is particularly useful for determining the UV-I/UV-B filtering capacity of the
transparent plastic and glass barriers that are commonly used below electric lamps.
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Direct Normal
Diffuse Blue
Metal Halide
Quartz Halogen
Mercury Arc
T12 Fluorescent UV-A Enhanced
UV-A LED (365 nm Peak)
UV-A LED (386 nm Peak)
UV-A LED (395 nm Peak)
Clear Sky
Overcast
CWF T5
Expected EFD Error [%]
0.0
-4.0
-2.8
3.6
18.0
-5.3
-4.1
18.8
17.6
19.0
-26.4
-53.7
Expected PFD Error [%]
0.0
-5.0
-3.6
4.7
19.0
-7.6
-5.6
19.2
20.0
16.9
-30.6
-57.0