Abstract

The interferometric correlation method can provide a simple and inexpensive solution for pollution imagery, especially in the case of a spatially localized gaseous cloud. We describe herein a general method for designing an interferometric correlator for the analysis of any pollutant gas that has regularly distributed absorption spectral lines. We also present a setup using a birefringent interferometer in front of a simplified camera formed by a plano–convex lens and a linear CCD sensor; this demonstrates the monitoring of SO₂ gas. Results from the laboratory simulation show the feasibility of this method. Outdoor measurements permit determination of the required conditions for on-site real-time measurement.

© 1995 Optical Society of America

Differential optical absorption spectrometer for measurement of tropospheric pollutants

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