Repetitive-scanning derivative spectrometer as a monitor of environmental air pollution

Abstract

The derivative spectrometer, developed for monitoring environmental air pollutants, employs signal processing to subtract the mean value of the minima of second derivative from the maximum, and to average the subtracted values. The signal processing leads to compensation of the long-term drift and hence to improvement of the sensitivity, i.e., the detection limit is 2–3 ppb or less for such gases as SO₂, NO, and NO₂, under circumstances where the ambient temperature fluctuates between 0 and 40°C.

© 1983 Optical Society of America

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