Event-locked time-resolved Fourier spectroscopy

    Authors

    H. Weidner;R. E. Peale

    Comments

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    Abbreviated Journal Title

    Appl. Spectrosc.

    Keywords

    spectroscopy; Fourier; time-resolved; DYNAMICS; EMISSION; Instruments & Instrumentation; Spectroscopy

    Abstract

    A low-cost method of adding time-resolving capability to commercial Fourier transform spectrometers with a continuously scanning Michelson interferometer has been developed. This method is specifically designed to eliminate noise and artifacts caused by mirror-speed variations in the interferometer. The method exists of two parts: (I) a novel timing scheme for synchronizing the transient events under study and the digitizing of the interferogram and (2) a mathematical algorithm for extracting the spectral information from the recorded data. The novel timing scheme is a modification of the well-known interleaved, or stroboscopic, method. It achieves the same timing accuracy, signal-to-noise ratio, and freedom from artifacts as step-scan time-resolving Fourier spectrometers by locking the sampling of the interferogram to a stable time base rather than to the occurrences of the HeNe fringes. The necessary pathlength-difference information at which samples are taken is obtained from a record of the mirror speed. The resulting interferograms with uneven pathlength-difference spacings are transformed into wavenumber space by least-squares fits of periodic functions. Spectra from the far-infrared to the upper visible at resolutions up to 0.2 cm(-1) are used to demonstrate the utility of this method.

    Journal Title

    Applied Spectroscopy

    Volume

    51

    Issue/Number

    8

    Publication Date

    1-1-1997

    Document Type

    Article

    Language

    English

    First Page

    1106

    Last Page

    1112

    WOS Identifier

    WOS:A1997XU63500006

    ISSN

    0003-7028

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