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ID 15776
Eprint ID
15776
FullText URL
Author
Koga, Ryuji
Nagase, Satoru
Sano, Hiroya
Abstract
A method to monitor atmospheric gas concentration employing a tunable diode laser is proposed. An apparatus was built and experiments were made. The tunable diode laser employed was of'PbSnTe with its wavenumber about 1200 cm(-1) at a temperature of 77 K. Methane concentration in laboratory atmosphere was measured on the experiments. The inquired gas-density is obtained by a hardwired microcomputer incorporating the measured absorption spectrum over a prescribed range instead of an absorption at a single wavenumber. By this, drift type noises are suppressed. After an analysis based on experimental data, an attainable sensitivity for methane was found to be 1 ppb.m. This value may increase if an etalon fringe interference exists. The natural concentration, about 1 ppm, of atmospheric methane was actually measured with a short optical path of only one meter.
Published Date
1981-03-30
Publication Title
Memoirs of the School of Engineering, Okayama University
Publication Title Alternative
岡山大学工学部紀要
Volume
volume15
Issue
issue2
Publisher
岡山大学工学部
Publisher Alternative
School of Engineering, Okayama University
Start Page
79
End Page
92
ISSN
0475-0071
NCID
AA00733903
Content Type
Departmental Bulletin Paper
language
英語
OAI-PMH Set
岡山大学
File Version
publisher
Refereed
False
Sort Key
8
Eprints Journal Name
mfe