Additional appts. for an interference spectrometer - giving interference fringes specific to gases under investigation, e.g. sulphur dioxide in pollutant gases

Abstract

Abstract The additional appts. enables interference fringes to be specific to the gas under investigation, e.g. SO2, NO2 or its derivs. in pollutant gases. It includes a source, typically xenon, a polariser, an interferometer, an analyser, a viewer for the fringes and a photomultiplier plus various adjustment techniques for the polariser and analyser. A specific claim of the appts. is that it can provide quantitative detection of gaseous atmospheric pollutants. Various arrangements of optical items are possible. The interferometer can be made of a pair of opposing wedge prisms (enabling the effective thickness to be varied) a low angle Wollaston prism, an analyser and receiver, plus a fixed grill on the outlet face of the Wollaston prism for viewing the fringes obtd.

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