Abstract

A multiline absorption spectroscopy technique was investigated based on the single-line absorption spectroscopy technique. An open-path methane-detecting system was designed. An LED was used as a broadband source, and a Fabry–Perot interferometer whose transmission peaks matched the methane R-branch absorption lines was used to enhance the detectable sensitivity. We demonstrate a minimum-detectable concentration of 7600 ± 10% ppm (parts per million) with a multiline differential absorption spectroscopy technique and a concentration of 1000 ± 10% ppm with a multiline wavelength modulation spectroscopy technique.

© 2006 Optical Society of America

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