ID 15776
JaLCDOI
Sort Key
8
フルテキストURL
著者
古賀 隆治 Department of Electronics
Nagase, Satoru Department of Electronics
Kosaka, Megumi Department of Electronics
Sano, Hiroya Department of Electronics
抄録
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.
出版物タイトル
Memoirs of the School of Engineering, Okayama University
発行日
1981-03-30
15巻
2号
出版者
岡山大学工学部
出版者(別表記)
School of Engineering, Okayama University
開始ページ
79
終了ページ
92
ISSN
0475-0071
NCID
AA00733903
資料タイプ
紀要論文
OAI-PMH Set
岡山大学
言語
English
論文のバージョン
publisher
NAID
Eprints Journal Name
mfe
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