 The PMA2101 detector gives an accurate measurement of
biologically weighted ultraviolet radiation from sunlight or artificial light sources,
also called sunburning UV radiation (SUV). Its spectral response follows closely the
erythema action spectrum. The detector has angular response very close to an ideal cosine
function (Lambertian response) making it suitable for measurements of diffuse radiation or
radiation generated by extended sources.
The measured irradiance can be displayed in MED/Hr, µW/cm 2 well as a time to accumulate one MED. High dynamic range allows measurements of very week signals down to 0.01 µW/cm2 as well as very strong irradiances over 1mW/cm2.The sensor is based on a phosphor technology, used in Robertson-Berger meters. and proven to be extremely stable over long periods of time. The biologic effectiveness of ultraviolet radiation is strongest for wavelengths between 280 to 315 nm, classified as UV-B by the CIE organization. Several biologic action spectra, functions relating wavelength of the radiation and its biologic effectiveness, are shown in Figure 3. The most commonly used, erythema action spectrum, also referred to as CIE 1987 action spectrum, represents the sensitivity of human skin to sunburn. Other biologic action spectra also exhibit rapid decline in UV effect with an increase of wavelength over the UV-B range. In general, the reading of an erythemally weighted detector cannot be directly interpreted as biological effectiveness other than erythemal. However, there is a way to make necessary corrections numerically.
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