Publisher's Synopsis
Excerpt from Infrared Transmittance Standards, Srms 2053, 2054, 2055, and 2056
Only the central 10 mm diameter portion of the filter should be used in the transmittance measurements. If possible the spectrophotometer beam should be centered on the sample. The certified transmittance values and associated uncertainties are intended to be correct for normally incident light. In practice, the values will be valid for an unpolarized beam with f/ 3 or slower geometry, where the central ray is within 2° of the sample normal. For larger angles of incidence, or polarized beams, the transmittance values will change.
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