Abstract

A high-frequency-modulation spectrometer with a lead-salt diode laser operating in the ν 4 band of CH4 at 7.8 µm was used as a fast chemical sensor to measure ambient methane concentrations of 2 ppmv (parts in 106 volume-mixing ratio) with a time resolution of 10 Hz for micrometeorological flux measurements. To assess the quality of the data on methane emissions from rice paddy fields, we compared eddy-correlation measurements with simultaneously recorded emission data from the state-of-the-art closed-chamber technique and showed that the closed-chamber measurements were 60%–90% higher than were the eddy-correlation measurements during the campaign. This outcome demonstrates that diode-laser spectroscopy is a valuable tool for quality assurance.

© 2001 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Application of antimonide lasers for gas sensing in the 3–4-µm range

Peter Werle and Andrei Popov
Appl. Opt. 38(9) 1494-1501 (1999)

Development of a spectrometer using a continuous wave distributed feedback quantum cascade laser operating at room temperature for the simultaneous analysis of N2O and CH4 in the Earth's atmosphere

Lilian Joly, Claude Robert, Bertrand Parvitte, Valery Catoire, Georges Durry, Guy Richard, Bernard Nicoullaud, and Virginie Zéninari
Appl. Opt. 47(9) 1206-1214 (2008)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription