The PMA1101 analog UVB sensor 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 PMA1101 UVB sensor 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.

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U.S.Pat.5,946,641

U.S.Pat.5,790,432

PMA1101               UVB Sensor

FEATURES

• High sensitivity
• Dynamic range 2*10⁵
• Excellent long term stability
• Cosine corrected
• NIST traceable calibration
• Radiometric and Biological units

APPLICATIONS

• Laboratory and industrial radiometry
• Skin and SPF testing
• Clinical studies
• Phototherapy
• Environmental monitoring
• Material testing
• UVB transmission measurements
• Agriculture

> Weatherproof UVB Detector available

> Underwater UVB Detector available
> Wiring Diagram

The high dynamic range of the PMA1101 UVB Sensor allows measurements of very weak signals down to 0.01 µW/cm² as well as very strong irradiances over 1mW/cm².

The UVB sensor is based on a phosphor technology, used in Robertson-Berger UV 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 UVB by the CIE organization.

Several biological 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 biological action spectra also exhibit rapid decline in UV effect with an increase of wavelength over the UVB 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.

Figure 1

UVB Sensor Specifications

• 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 [mw/cm2], 0.01[W/m²]
• Operating environment 32 to 120 °F (0 to +50 °C) no precipitation
• Temperature coefficient 1% /°C for solar radiation
• Cable  5ft (1.5m)
• Diameter 1.6" (40.6 mm)
• Height 1.8" (45.8 mm)
• Weight 7.1 oz. (200 grams)

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