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| Titel: |
Carbon dioxide detection using NIR diode laser based wavelength modulation photoacoustic spectroscopy |
| Auteur: |
Jingsong Li Kun Liu WeiJun Zhang Weidong Chen Xiaoming Gao |
| Verschenen in: |
Optica applicata |
| Paginering: | Jaargang 38 (2008) nr. 2 pagina's 341-352 |
| Jaar: |
2008 |
| Inhoud: |
A photoacoustic sensor using a laser diode emitting near 1573 nm in combination with a dual-microphone resonant photoacoustic cell has been developed for carbon dioxide trace gas analysis at atmospheric pressure. Wavelength-modulation scheme and 1<em>f</em> detection for CO<sub>2</sub> concentration measurements in Ar are demonstrated. The noise equivalent absorption sensitivity of NEAS(1<em>σ</em>) = 1.01×10<sup>–8</sup> Wcm<sup>–1</sup>/Hz<sup>1/2</sup>, corresponding to a detection limit of 30 parts in 10<sup>6</sup> by volume (ppmv) for a 100 s integration time and 4.5 mW average laser power. The photoacoustic response of CO<sub>2</sub> dependence on the buffer gases with different mixture ratio of Ar and N<sub>2</sub> was investigated. Finally, the possibility to make use of the sensor for measurements of ambient CO<sub>2</sub> is also presented. |
| Uitgever: |
Wroclaw University of Technology |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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