Dr. J. Alberto Morales Profile

Dr. J. Alberto Morales

at Technological Univ Dublin

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Proceedings Article | 27 August 2003 Paper

Miniaturized differential optical absorption spectroscopy (DOAS) system for the analysis of NO₂

J. Alberto Morales, James Walsh, Jack Treacy, Wendy Garland

Proceedings Volume 4876, (2003) https://doi.org/10.1117/12.463920

KEYWORDS: Spectroscopy, Absorption, Atmospheric optics, Absorbance, Absorption spectroscopy, Fiber optics, Lamps, Telescopes, Calibration, Light sources

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Current trends in optical design engineering are leading to the development of new systems which can analyze atmospheric pollutants in a fast and easy way, allowing remote-sensing and miniaturization at a low cost. A small portable fiber-optic based system is presented for the spectroscopic analysis of a common gas pollutant, NO₂. The novel optical set-up described consists of a small telescope that collects ultraviolet-visible light from a xenon lamp located 600 m away. The light is coupled into a portable diode array spectrometer through a fiber-optic cable and the system is controlled by a lap-top computer where the spectra are recorded. Using the spectrum of the lamp as a reference, the absorption spectrum of the open path between the lamp and the telescope is calculated. Known absorption features in the NO₂ spectrum are used to calculate the concentration of the pollutant using the principles of Differential Optical Absorption Spectroscopy (DOAS). Calibration is carried by using sample gas bags of known concentration of the pollutant. The results obtained demonstrate that it is possible to detect and determine NO₂ concentrations directly from the atmosphere at typical environment levels by using an inexpensive field based fiber-optic spectrometer system.

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