Photoacoustic methane detection using a novel DFB-type diode laser at 3.3 ¦Ìm
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- 作者：Marcus Wolff ; Stephan Rhein ; Henry Bruhns ; Lars N?hle ; Marc Fischer ; Johannes Koeth
- 关键词：Diode laser ; MIR ; Room temperature ; Methane ; Hydrocarbon ; Sensor
- 刊名：Sensors and Actuators B: Chemical
- 出版年：2013
- 出版时间：October, 2013
- 年：2013
- 卷：187
- 期：Complete
- 页码：574-577
- 全文大小：525 K
文摘
To the best of our knowledge, we present for the first time spectroscopic methane measurements using a laser diode at 3.3 ¦Ìm operated in continuous mode at room temperature. The DFB-type laser emits a maximum optical output power of 1.5 mW with a spectral linewidth below 10 MHz. This novel kind of semiconductor laser allows precise photoacoustic measurements of characteristic methane absorption structures in the ¦Í3 band. In addition, the setup enables a detection limit below 1 ppm.