Two procedures for the estimation of the uncertainty of spectral irradiance measurement for UV source calibration

Abstract

The measurement uncertainty of the spectral irradiance of an UV lamp is computed by using the law of propagation of uncertainty (LPU) as described in the ‘ Guide to the Expression of Uncertainty in Measurement ’ (GUM), considering only a first-order Taylor series approximation. Since the spectral irradiance model displays a non-linear feature and since an asymmetric probability density function (PDF) is assigned to some input quantities, the usage of another process was required to validate the LPU method. The propagation of distributions using Monte Carlo (MC) simulations, as depicted in the supplement of the GUM (GUM-S1), was found to be a relevant alternative solution. The validation of the LPU method by the MC method is discussed with regard to PDF choices, and the benefit of the MC method over the LPU method is illustrated.

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