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第四届亚洲土工合成材料学术大会论文集 英文版_63.docx

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exposed are the determinant factors in acceleratingdegradation.The type of radiation is described by the wavelengthsemitted and their intensities, i.e., by the spectral powerdistribution (SPD) of the light source.Fluorescent UV-A lamps are very used in laboratorysimulations and the kinds more common are UVA-340(used for simulation of the short and middle UVwavelength region of daylight) and UVA-351 (used forsimulation of the short and middle UV wavelength regionof daylight which has been filtered through window glass).Thus, for simulations of direct solar UV radiation theUVA-340 lamp is recommended. Because UVA-340 lampstypically have little or no UV output below 300 nm (that isconsidered the “cut-on” wavelength for terrestrialsunlight), they usually do not degrade materials as rapidlyas UVB lamps, but they may allow enhanced correlationwith actual outdoor weathering. Tests using UVA-340lamps have been found useful for comparing differenlnonmetallic materials such as polymers, textiles, and UV
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Term
Summer
Professor
Eric Larson
Tags
Ultraviolet

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