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Larason, T. C. (2001) Avoiding Errors in UV Radiation Measurements. Photonics Spectra, 
Added by: Sarina (13 Apr 2009 18:13:22 UTC)   Last edited by: Sarina (13 Apr 2009 18:16:15 UTC)
Resource type: Journal Article
BibTeX citation key: Larason2001a
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Categories: Englisch = English
Keywords: Photometrie = Photometry, Ultraviolett = Ultraviolet
Creators: Larason
Collection: Photonics Spectra
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Abstract
The variety of applications of ultraviolet (UV) light and the consequent need for accurate UV measurements have increased. In some cases, the UV radiation from a source is of interest. At other times, the action or chemical reaction initiated by UV irradiation of a system is of interest. Also, UV radiation has a cumulative harmful effect on biological systems; consequently, the accurate measurement of UV radiation is required for health and safety. The typical broadband UV meter or radiometer is composed of a number of simple optical elements, as shown in Fig. 1. The signal i observed from such a UV radiometer is the photosensitive area of the meter A multiplied by the integral of the product of the instrument responsivity S(l) and the irradiance distribution of the source E(l) [1]: . (1) The instrument responsivity is a function of the responsivity of the detector as well as the transmittance of the diffuser and optical filter. To fully understand the accuracy of a UV meter, the optical properties of its components and the spectral responsivity should be known as well as the relative spectral distribution of the source. Most UV meters are supplied with a calibration at a specific wavelength, and only a nominal wavelength band is specified. In addition, the spectral distribution of the source being measured is often unknown. It is important to define, at the outset, the physical quantity that is to be measured and the level of uncertainty needed to achieve the measurement goals. The measurement requirements for the UV meter can be very different: spectrally integrated irradiance (W/cm2) in the UV-A (315 nm to 400 nm) or UV-B (280 nm to 315 nm) regions as in the case of solar irradiation; a single wavelength dose or exposure (J/cm2) as in the case of semiconductor photolithography; or an effective or weighted dose (Effective J/cm2) as in the case of biological action spectra.

Keywords: UV Radiation
Total pages: 8. Availability information updated on .
Added by: Sarina  
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