Achieving Accurate FTIR Measurements On High Performance Bandpass Filters
R Hunneman, R E Sherwood, C Deeley, R Spragg
CP430, Pages 435-438, ICOFTS-11, the Eleventh International Conference on Fourier Transform Spectroscopy, USA (1997)
The optical industry has been slow to adopt Fourier Transform instrumentation for critical transmission measurements because of concerns about the ordinate accuracy. In this poster we look at the problems in characterizing a set of bandpass filters required for a satellite-borne instrument. Particular emphasis is placed on the measurement of weak features in the blocking regions of bandpass filters. The procedures we have adopted to identify any residual effects due to double modulation or nonlinearities are reported. Out of band features can be reliably measured at levels well below 0.01%T.