Comparison of Near-Infrared Transmittance and Reflectance Measurements Using Dispersive and Fourier Transform Spectrophotometers
James J. Butler, H Park, P Y. Barnes, E A. Early, C van Eijk-Olij, A E. Zoutman, S van Buller-Leeuwen, J G. Schaarsberg
A spectrophotometer based on an integrating sphere coupled to a commercial FTIR instrument has been constructed for regular spectral transmittance and reflectance measurements over the 1 m to 18 m wavelength region. Despite the large number of error sources which often limit the photometric accuracy of FTIR measurements, we demonstrate uncertainties on a par with established dispersive instrumentation. We performed near-normal incidence reflectance and transmittance measurements on a series of samples over the 1 m to 2.5 m wavelength range using both FTIR and dispersive spectrophotometers. The results are compared, taking into account any differences in measurement geometry among the various systems, and the combined measurement uncertainty.
Fourier transform infrared spectrometer, infrared, reflectance, standard reference material, transmittance
, Park, H.
, Barnes, P.
, Early, E.
, van Eijk-Olij, C.
, Zoutman, A.
, van Buller-Leeuwen, S.
and Schaarsberg, J.
Comparison of Near-Infrared Transmittance and Reflectance Measurements Using Dispersive and Fourier Transform Spectrophotometers, Metrologia
(Accessed December 10, 2023)