Stray Radiant Energy in Optical-Null Spectrometry

Author: Fleming Paddy  

Publisher: Society for Applied Spectroscopy

ISSN: 0003-7028

Source: Applied Spectroscopy, Vol.44, Iss.3, 1990-03, pp. : 522-523

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Abstract

The method to determine the relative stray radiant energy (SRE) in UV spectrometry, which was described by Mielenz et al., may be adapted to apply to optical-null spectrophotometers for all possible reference cell to-sample-cell thickness ratios less than unity [i.e., β (=br/bs) < 1] and to include situations where the "cutoff" solution is not transparent to SRE. If the same cutoff solution is placed in both cells but the sample cell is β-times as thick as the reference cell, then the transmittance ratio (τ'λ) of the sample solution relative to the reference solution in the presence of a SRE level x is given by:τ'λ = τλ + tx)/τλβ + tβτ'λx) (1)where τλ is the true instantaneous transmittance of the sample-beam solution to monochromatic light of wavelength λ, and t is its transmittance to SRE.