Time-resolved Fourier-transform optical spectroscopy utilizing i

Details Time-resolved Fourier-transform optical spectroscopy utilizing i Time-resolved Fourier-transform optical spectroscopy utilizing i

1994-08-11

1995-09-12

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, G01B 902

Patent

active

054501962

ABSTRACT:
In FT-DIRLD (Dynamic Infra Red Linear Dichroism) apparatus partly represented in FIG. 1, units 100-105, responding to interferometer output IB (indicated elsewhere), cause unit 106 to yield an interferogram combining static and dynamic dichroism interferograms. Reference signals respectively in phase and quadrature with cyclic sample strain are derived from rheometer 102. At each OPD point of predetermined uninterrupted scans, controller 108 routes simultaneously a data point of the combined interferogram and the reference signals to respective channels of multiplexer 107. A microprocessor (shown elsewhere) subsequently performs a best-fit-to-an ellipse sorting of the data and for each OPD derives: A) the value of the interferogram unaffected by sample modulation; B) the corresponding in phase term; and C) the corresponding in quadrature term; furthermore, from the A, B,C data-point series it generates the interferogram of each series and transforms it into a spectrum. DIRLD analysis is achieved asynchronously and in continuous fast scanning.

REFERENCES:
patent: 4684255 (1987-08-01), Ford
patent: 5196903 (1993-03-01), Masutani
"Time-Resolved Spectroscopy of Stretched Polypropylene Films" by W. G. Fately and J. L. Koenig published in the Journal of Polymer Science 1982-pp. 445-452.

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