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Proceedings Paper

Atmospheric pollution determination by the differential group delay method
Author(s): Yuri S. Galkin; Victor N. Kharchenko
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Paper Abstract

The atmospheric pollution concentration is usually determinated by the differential absorption (DA) method using spectral absorption lines of pollution. It is known the relationship between absorption and the phase refractive index (PRI) of medium is given by the Kramers-Kronig ratio. The maximal difference of PRI near spectral line will be more than DA sensitivity. Using the Raleigh's relation the group refraction index (GRI) may be obtained too. Investigations show that the GRI has a considerably much deviation (about million times) near absorption line then the PRI. It is proposed to use above deviation for atmospheric pollution determination by measuring propogating signals differential group delay (DGD) between extremal deviation points. It is shown that the new method sensitivity is 10-20 and more times higher than with DA method.

Paper Details

Date Published: 21 September 1995
PDF: 6 pages
Proc. SPIE 2503, Air Toxics and Water Monitoring, (21 September 1995);
Show Author Affiliations
Yuri S. Galkin, Moscow State Univ. of Forest (Russia)
Victor N. Kharchenko, Moscow State Univ. of Forest (Russia)

Published in SPIE Proceedings Vol. 2503:
Air Toxics and Water Monitoring
George M. Russwurm, Editor(s)

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