Biologically-Weighted
UVB Detector |
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FEATURES
 | High sensitivity |
| Dynamic range 2*105 |
| Excellent long term stability |
| Cosine corrected |
| NIST traceable calibration |
| Radiometric and biological units |
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| 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. |
APPLICATIONS
| Laboratory and industrial radiometry |
| Skin and SPF testing |
| Clinical studies |
| Phototherapy |
| Environmental monitoring |
| Material testing |
| UV-B transmission measurements |
| Agriculture |
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| The measured irradiance can be displayed in MED/Hr,
µW/cm2
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 320 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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Figure 3: Selected Biologic Action Spectra |
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SPECIFICATIONS
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| Spectral response |
Follows erythema
action spectrum Figure 1 |
| Angular response |
5% for angles <60° |
| Range |
200 [MED/Hr], 1,160
[µW/cm2] |
| Display resolution |
0.001 [MED/Hr],
0.01[µW/cm2] |
| Operating environment |
32 to 120 °F (0 to
+50 °C) no precipitation |
| Temperature coefficient |
1% /°C for solar
radiation |
| Cable |
1ft, retractable to
5ft (0.3m/1.5m) |
| Diameter |
1.6" (40.6 mm) |
| Height |
1.8" (45.8 mm) |
| Weight |
7.1 oz. (200 grams) |
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Analog versions of this detector are available See PMA1101 |
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Return to Detector Selection Guide
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