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Standardization of Broadband UV Measurements



George P. Eppeldauer


The CIE standardized rectangular-shape UV response functions can be realized only with large spectral mismatch errors. The spectral power-distribution of UV sources is not standardized. Accordingly, the readings of different types of UV meters, even if they measure the same UV source, can be very different. In order to solve this problem, available UV detectors and UV meters used for irradiance measurement from 365 nm sources were evaluated. The spectral product of the source-distribution and the meter’s spectral-responsivity were calculated for different combinations to estimate broad-band signal-measurement errors. Standardization of both the UV source-distribution and the measurement procedure is recommended here in an example where 365 nm sources are measured with UV-A meters. The goal is to perform uniform broad-band UV measurements with low uncertainty. It is shown what spectral responsivity function(s) is needed for new and existing UV irradiance meters to perform low-uncertainty broadband (with ~365 nm peak) measurements.
Standardization of Broad Band UV Measurements for 365-nm LED Sources


365 nm sources, broadband UV measurement, CIE UV-A function, spectral mismatch, standardization, ultraviolet, UV sources, UV meters


Eppeldauer, G. (2013), Standardization of Broadband UV Measurements, Standardization of Broad Band UV Measurements for 365-nm LED Sources, [online], (Accessed April 22, 2024)
Created January 1, 2013, Updated February 19, 2017