1 82
ID 15776
JaLCDOI
Sort Key
8
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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.
Publication Title
Memoirs of the School of Engineering, Okayama University
Published Date
1981-03-30
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
OAI-PMH Set
岡山大学
language
英語
File Version
publisher
NAID
Eprints Journal Name
mfe