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- Aerosol Measurement
- Germicidal
- Materials Testing
- Ozone Column
- Photobiology
- Photostability
- Radiometry
- Solar Cell Testing
- UVCuring
- UVHazard
- UV Transmission
PMA 2105 UVB Sensor PMA 2105 with Beam Splitter Adapter
The PMA2105 UVB sensor gives an accurate measurement of biologically weighted ultraviolet radiation from Solar Simulators manufactured by Solar Light Co. |
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U.S.Pat.5,946,641 U.S.Pat.5,790,432 |
FEATURES
APPLICATIONS
> Sensors need to be used with a Radiometer
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Special mounting hardware allows direct coupling with beam splitter available for 16S Solar Simulators. The sensor’s spectral response follows closely the erythema action spectrum (Fig.1.)[1]. Due to built-in Teflon diffuser the detector has negligible azimuthal error making the measurement insensitive to the rotation of the detector. Extended measurement range of 600 MED/Hr enables measurement of intense radiation. The TLV for UV radiation specified by ACGIH apply to sources which subtend an angle less than 80°. Sources which subtend a greater angle need to be measured only over an angle of 80°. The instantaneous value indicates how long an exposure at the intensity being measured is required to produce a dose of 3 mJ/cm2. The PMA can also be set to continuously monitor UV and sound an alarm when the preset dose or irradiance level is reached. In conjunction with the Solar Simulator and XPS200 Xenon Lamp Power Supply the PMA2100 with the PMA2105 sensor can operate as a smart dose controller/monitor substantially enhancing the functionality of the Solar Simulator. The measurement result can be shown in MED/Hr, µW/cm2 as well as a time to accumulate 1 MED. High dynamic range of the detector allows measurements down to 0.1 µW/cm2 with the ability to measure radiation as strong as 3.5 mW/cm2. The biologic effectiveness of ultraviolet radiation is strongest for wavelengths between 280 to 320 nm, classified as UVB by the CIE. Several biologic action spectra, functions relating wavelength and the biologic effectiveness, are shown in Figure 3. The most commonly used, erythema action spectrum [1], 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 UVB range. In
general the reading of an erythemally weighted detector cannot be
directly interpreted as biological effectiveness other than
erythemal. However, there are ways to make the necessary correction The biologic effectiveness of the UV radiation can be measured in terms of effective irradiance in radiometric units, for example [µW/cm2]. It is often related to the sensitivity of the human skin to sunburn and expressed in Minimal Erythemal Doses per Hour [MED/Hr]. One MED is the effective UV dose capable of causing minimum redness (erythema) in an average number 2 skin. Based on a study [3], the relationship between MED/Hr and radiometric units was assumed:
Figure 3: Selected Biologic Action Spectra |
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Specifications
Analog versions of this sensor are available See PMA1105 > Return to Sensor Selection Guide
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© 2011 Solar Light. All rights reserved.