Spectral measurements of stack effluents using a double-beam interferometer with background suppression

The emission spectra of the effluents from four selected stacks were measured using a double-beam interferometer to provide real-time background suppression. The double-beam interferometer system, installed in a mobile van, provided the capability for field site measurements and near real-time graphical data display. The advantages of double-beam interferometric background suppression are discussed. Selected spectra were analyzed, and one, from a municipal incinerator, was compared with a fascode generated synthetic spectrum.