Abstract
Reliable Fourier spectrometers have been extensively employed for the collection of high spectral resolution infrared emission and absorption spectra. These spectrometers are being used in difficult field situations. Weak and fluctuating sources have been measured by coherently adding many interferograms. The specifications of field-grade Fourier spectrometers are presented. The measurement techniques for obtaining quantitative infrared spectra from remote sources are described. Examples of high spectral resolution infrared measurements of smokestacks, sky emission, jet aircraft and missile exhausts are shown.