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Proceedings Paper

Application Of Interferential Correlation Of Spectra To The Detection Of Pollutants In The Atmosphere
Author(s): G. Fortunato; A. Marechal; Melle Wolfer
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Paper Abstract

Modern spectrometry offers rich possibilities by convenient use either of interferometric devices (Fourier transform spectrometry) or of selective modulation (grid spectrometry).Progresses in resolution and luminosity have been spectacular in the last decade, and new domains of high resolution and low luminosity have been explored. In those cases of extreme performances, the instruments are generally highly sophisticated,delicate, and expensive. Nevertheless, Fourier transform spectroscopy is now developing for practical applications : we have examined the possibilities of interferometric devices to routine spectral analysis in chemistry, biology, pollution detection etc... and are now aware of the interesting characteristics of those mountings by the fact that they are luminous, flexible and very simple. They need no computer and are very suitable for low resolutions. We shall describe first the basic principle, and later focus on the various possibilities resulting from the direct access to the interferogram and the application of the mathematical properties of the Fourier transform : Fourier derivation, Fourier correlation with a reference spectrum, Fourier correlation of derivatives etc... All those possibilities result from techniques of matched filtering for spectral recognition, obviously similar to analog techniques for pattern recognition.

Paper Details

Date Published: 18 April 1978
PDF: 5 pages
Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956131
Show Author Affiliations
G. Fortunato, Institute of Optics Orsay (France)
A. Marechal, Institute of Optics Orsay (France)
Melle Wolfer, Institute of Optics Orsay (France)

Published in SPIE Proceedings Vol. 0136:
1st European Conf on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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