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Proceedings Paper

Applications Of Step-Scan Interferometry
Author(s): Christopher J. Manning; Jeffrey M. Widder; Richard A. Palmer; James L. Chao
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Paper Abstract

Interferometry, in combination with the Fourier transform, is a powerful tool for IR spectroscopy. However, most commercial MIR spectrometers are not well suited to measuring spectra of dynamic systems. This disadvantage is due to the rapid scan mode of operation, in which the scanning mirror of the interferometer moves at constant velocity, v. As a consequence, each IR wavelength, λ, is modulated with its own Fourier frequency (f = 2v/λ). This time dependent modulation of the IR, caused by the rapid scan, becomes increasingly more difficult to separate from time dependent variations of the IR intensity caused by a dynamic system under study, as the time resolution desired approaches the Fourier modulation periods. A convenient solution to this problem is the use of step-scan interferometry. In this mode of operation, the moving mirror of the interferometer is stopped at evenly spaced intervals of the HeNe reference laser interference pattern while data are collected. As a consequence, the IR light is not modulated by the interferometer, and temporal intensity variations can be related to the dynamic system under study. Applications include photothermal/photoacoustic spectroscopy, phase-resolved spectroscopy, and classic time-resolved spectroscopy (i.e., pulsed excitation).

Paper Details

Date Published: 1 December 1989
PDF: 2 pages
Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); doi: 10.1117/12.969609
Show Author Affiliations
Christopher J. Manning, Duke University (United States)
Jeffrey M. Widder, Duke University (United States)
Richard A. Palmer, Duke University (United States)
James L. Chao, IBM Corporation (United States)

Published in SPIE Proceedings Vol. 1145:
7th Intl Conf on Fourier Transform Spectroscopy
David G. Cameron, Editor(s)

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