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A procedure for the accurate measurement of infrared dichroism of oriented film
Author(s) -
Stein Richard S.
Publication year - 1961
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1961.070051314
Subject(s) - polarizer , chopper , dichroism , infrared , optics , spectrometer , materials science , detector , beam (structure) , sample (material) , analytical chemistry (journal) , physics , chemistry , birefringence , chromatography , quantum mechanics , voltage , thermodynamics
A method is described for measuring directly the infrared dichroism spectrum of a film by use of a single‐beam spectrometer. The method involves modulating the beam passing through the sample with a rotating polarizer rather than with a chopper. The a.c. response of a detector is then proportional to the difference between the principal absorbencies of the sample.