ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The use of an acousto-optic tunable filter spectrometer can simplify the instrumental requirements for the collection of time resolved spectra to measure the difference in absorbance of polarized radiation due to chemical functional group orientation of a polymer as it undergoes repetitive oscillatory strain. The rapid data collection achieved in the near-infrared spectral region rivals that of current interferometric instruments. Achieving a good signal to noise ratio requires only a singly modulated optical signal, and the use of digital filtering eliminates the requirement of phase sensitive detection. The usefulness of this instrument for routine testing of polymers is demonstrated by differentiating polymers of the same chemical composition but different rheology and by determining the effect of varying the concentration of monomers in a copolymer. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1355265
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