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

作者：Nwaboh J A^*; Hald J; Lyngso J K; Petersen J C; Werhahn O

来源：Applied Physics B: Lasers and Optics , 2013, 110(2): 187-194.

DOI：10.1007/s00340-012-5047-0

Recently, hollow-core photonic bandgap fibers (HC-PBFs) for use in the 2 mu 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 cell's sensitivity and limit of detection were calculated to be 3.5x10(-4) cm(-1)a <...Hz(-1/2) and 59 ppma <...m, respectively. To substantiate the spectrometer performance, a measurement was done in the Herriott cell probing a reference gas mixture with nominal 400 mu mol/mol CO2 in N-2. 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.

• 出版日期2013-2