Carbon dioxide detection using NIR diode laser based wavelength modulation photoacoustic spectroscopy

• Autorzy: Li J. , Liu K. , Zhang W. , Chen W. , Gao X.
• Języki publikacji: EN

Abstrakty

EN

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 1f detection for CO2 concentration measurements in Ar are demonstrated. The noise equivalent absorption sensitivity of NEAS(1? ) = 1.01×10-8 Wcm-1/Hz1/2, corresponding to a detection limit of 30 parts in 106 by volume (ppmv) for a 100 s integration time and 4.5 mW average laser power. The photoacoustic response of CO2 dependence on the buffer gases with different mixture ratio of Ar and N2 was investigated. Finally, the possibility to make use of the sensor for measurements of ambient CO2 is also presented.

Słowa kluczowe

EN

photoacoustic spectroscopy; NIR diode laser; wavelength modulation; CO2 detection

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2008
• Tom: Vol. 38, nr 2
• Strony: 341--352
• Opis fizyczny: Bibliogr. 30 poz.

Twórcy

autor

Li J.

autor

Liu K.

autor

Zhang W.

autor

Chen W.

autor

Gao X.

• Environmental Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, People Republic of China,

Bibliografia

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