Measurements of CO2 in a multipass cell and in a hollow-core photonic bandgap fiber at 2 ?m

Recently, hollow-core photonic bandgap fibers (HC-PBFs) for use in the 2 ?m wavelength region have become available. We have employed tunable diode laser absorption spectroscopy (TDLAS) to quantify CO2 in nitrogen, injected into a HC-PBF. Our spectrometer contains both an HC-PBF-based absorption cel...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2013-02, Vol.110 (2), p.187-194
Main Authors: Nwaboh, JA, Hald, J, LyngsA, J K, Petersen, J C, Werhahn, O
Format: Article
Language:English
Subjects:
Carbon dioxide
Fibers
Lasers
Mathematical analysis
Photonics
Spectrometers
Spectroscopy
Wavelengths
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Summary:Recently, hollow-core photonic bandgap fibers (HC-PBFs) for use in the 2 ?m wavelength region have become available. We have employed tunable diode laser absorption spectroscopy (TDLAS) to quantify CO2 in nitrogen, injected into a HC-PBF. Our spectrometer contains both an HC-PBF-based absorption cell and an astigmatic Herriott multipass gas cell. The Herriott cell was used for comparison with the HC-PBF cell. The HC-PBF cellas sensitivity and limit of detection were calculated to be 3.5A10?4 cm?1?Hz?1/2 and 59 ppm?m, respectively. To substantiate the spectrometer performance, a measurement was done in the Herriott cell probing a reference gas mixture with nominal 400 ?mol/mol CO2 in N2. The spectrometric results were in good agreement with the reference value. The relative standard uncertainty of the spectrometric result was found to be at the A-2 % level.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-012-5047-0