Photoacoustic CO2 Detection at 2.7 μm

被引：1

作者：

Wolff, Marcus ^{[1
,2
]}

Groninga, Hinrich G. ^{[1
]}

Harde, Hermann ^{[3
]}

机构：

[1] PAS Tech GmbH, Bahnhofstr 3, D-19246 Zarrentin, Germany

[2] Hamburg Univ Appl Sci, D-20099 Hamburg, Germany

[3] Helmut Schmidt Univ, D-22043 Hamburg, Germany

来源：

OPTICAL SENSING II | 2006年 / 6189卷

关键词：

photoacoustic spectroscopy; distributed feedback; diode laser; carbon dioxide; isotopes; absorption; spectrum;

D O I：

10.1117/12.661736

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We present a new detection scheme for carbon dioxide (CO2) based on a custom-made room temperature distributed feedback (DFB) diode laser at 2.7 mu m, currently representing the laser with the highest emission wavelength of its kind. The detector's especially compact and simple set-up is based on photoacoustic spectroscopy (PAS). This method makes use of the transformation of absorbed modulated radiation into a sound wave. The sensor enables a very high detection sensitivity for CO2 in the ppb range. Furthermore, the carefully selected spectral region as well as the narrow bandwidth and wide tunability of the single-mode laser ensure an excellent selectivity. Even measurements of different CO2 isotopes can be easily performed. This could enable future applications of this spectroscopic sensor in medical diagnostics (e.g. C-13-breath tests).

引用

页数：6

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