Abstract
Quartz-enhanced photoacoustic spectroscopy was employed for trace gas concentration measurements of CO2 and NH3 using a continuous wave thermoelectrically cooled, distributed feedback diode laser operating at 2 μm. A normalized noise equivalent absorption coefficient, NNEA(1σ)=1.4×10-8 cm-1W/\(\sqrt{\text{Hz}}\) was obtained for CO2 using the R18 line of the 2ν1+ν3 band at 4991.26 cm-1. This corresponds to minimum detection limit (1σ) of 18 parts per million (ppm) for a 1 s lock-in time constant. The influence of the H2O presence in the sample gas mixture on the CO2 sensor performance was investigated. Ammonia detection was performed using the P P 6(6)S line of the ν3+ν4 band at 4986.99 cm-1. A detection limit (1σ) of 3 ppm for NH3 concentration with a 1 s lock-in time constant was achieved. This results in a normalized noise equivalent absorption of NNEA(1σ)=8.9×10-9 cm-1W/\(\sqrt{\text{Hz}}\).
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82.80.Kq; 46.62.Fi; 42.55.Px
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Lewicki, R., Wysocki, G., Kosterev, A. et al. Carbon dioxide and ammonia detection using 2 μm diode laser based quartz-enhanced photoacoustic spectroscopy. Appl. Phys. B 87, 157–162 (2007). https://doi.org/10.1007/s00340-006-2474-9
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DOI: https://doi.org/10.1007/s00340-006-2474-9