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Journal Article

Open-path trace gas detection of ammonia based on cavity-enhanced absorption spectroscopy

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Peeters, R., Berden, G., Apituley, A., & Meijer, G. (2000). Open-path trace gas detection of ammonia based on cavity-enhanced absorption spectroscopy. Applied Physics B: Lasers and Optics, 71(2), 231-236. doi:10.1007/s003400000302.

Cite as: https://hdl.handle.net/21.11116/0000-000C-06F1-D
A compact open-path optical ammonia detector is developed. A tunable external-cavity diode laser operating at 1.5 μm is used to probe absorptions of ammonia via the cavity-enhanced absorption (CEA) technique. The detector is tested in a climate chamber. The sensitivity and linearity of this system are studied for ammonia and water at atmospheric pressure. A cluster of closely spaced rovibrational overtone and combination band transitions, observed as one broad absorption feature, is used for the detection of ammonia. On these molecular transitions a detection limit of 100 ppb (1 s) is determined. The ammonia measurements are calibrated independently with a chemiluminescence monitor. Compared to other optical open-path detection methods in the 1–2 μm region, the present result shows an improved sensitivity for contactless ammonia detection by over one order of magnitude. Using the same set-up, a detection limit of 100 ppm (1 s) is determined for the detection of water at atmospheric pressure.