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Publication Citation: Segmented chirped-pulse Fourier transform submillimeter spectroscopy for broadband gas analysis

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Author(s): Justin L. Neill; Brent J. Harris; Amanda L. Steber; Kevin O. Douglass; David F. Plusquellic; Brooks H. Pate;
Title: Segmented chirped-pulse Fourier transform submillimeter spectroscopy for broadband gas analysis
Published: August 15, 2013
Abstract: Chirped-pulse Fourier transform spectroscopy has recently been extended to millimeter wave spectroscopy as a technique for the characterization of room-temperature gas samples. Here we present a variation of this technique that significantly reduces the technical requirements on high-speed digital electronics and the data throughput, with no reduction in the broadband spectral coverage and no increase in the time required to reach a given sensitivity level. This method takes advantage of the frequency agility of arbitrary waveform generators by utilizing a series of low-bandwidth chirped excitation pulses paired in time with a series of offset single frequency local oscillators, which are used to detect the molecular free induction decay signals in a heterodyne receiver. A demonstration of this technique is presented in which a 67 GHz bandwidth spectrum of methanol (spanning from 792 to 859 GHz) is acquired in 58 υs.
Citation: Optics Express
Volume: 21
Issue: 17
Pages: pp. 19743 - 19749
Keywords: emission; far infrared or terahertz; heterodyne; solid-state detectors; spectrometers and spectroscopic instrumentation; spectroscopy
Research Areas: Biological Product Characterization
DOI: http://dx.doi.org/10.1364/OE.21.019743  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)