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Measurements of Doppler shifts by gas correlation spectroscopy.

IR gas correlation spectroscopy is a sensitive technique for the measurement of small Doppler shifts in spectra. This technique also exhibits several important advantages over alternative methods in the remote sensing of stratospheric and mesospheric winds from spacecraft. Attention is presently given to laboratory tests demonstrating gas correlation spectroscopy's quantitative measurement of small Doppler shifts in spectra, whose close agreement with theoretical predictions suggests that measurements of the change in the radiant flux through a gas correlation spectrometer can be used to measure the relative velocity between gas and instrument for a moving parcel of gas.