The spectral transmission factor of liquids is currently determined
by spectrophotometry for various applications, including
spectrocolorimetry. Applications exist that require an accuracy of
the order of 10-3 or higher in the intrinsic transmission
factor. This requirement brings about the exploration of the
corrections made necessary by the measuring cells’ lack of pairing,
the reference liquid’s (water or solvent) spectral nonflatness,
the refractive-index difference between the sample and the reference
liquid, and the multiple reflections on cell walls. An analysis is
conducted, and a procedure is presented for the self-correction of the
cell’s lack of pairing and for the correction of systematic errors
from the reference liquid’s spectral nonflatness as well as for the
refractive-index discrepancies between the sample and the reference
liquids and for the multiple beam reflections.
© 1998 Optical Society of America
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