Measurements of CO2 in a multipass cell and in a hollow-core photonic bandgap fiber at 2 μm
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- Nwaboh, J.A., Hald, J., Lyngsø, J.K. et al. Appl. Phys. B (2013) 110: 187. doi:10.1007/s00340-012-5047-0
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Recently, hollow-core photonic bandgap fibers (HC-PBFs) for use in the 2 μm 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 cell’s sensitivity and limit of detection were calculated to be 3.5×10−4 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 μmol/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 ±2 % level.