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- c922a16e-a29b-4d0a-8fda-5015767bee37 definition "We demonstrate a compact, open-path, quantum cascade-laser-based atmospheric ammonia sensor operating at 9.06 µm for high-sensitivity, high temporal resolution, ground-based measurements. Atmospheric ammonia (NH3) is a gas-phase precursor to fine particulate matter, with implications for air quality and climate change. Currently, NH3 sensing challenges have led to a lack of widespread in situ measurements. Our open-path sensor configuration minimizes sampling artifacts associated with NH3 surface adsorption onto inlet tubing and reduced pressure sampling cells, as well as condensed-phase partitioning ambiguities. Multi-harmonic wavelength modulation spectroscopy allows for selective and sensitive detection of atmospheric pressurebroadened absorption features. An in-line ethylene reference cell provides real-time calibration (±20 % accuracy) and normalization for instrument drift under rapidly changing field conditions. The sensor has a sensitivity and noise-equivalent limit (1σ) of 0.15 ppbv NH3 at 10 Hz, a mass of ∼ 5 kg and consumes ∼ 50 W of electrical power. The total uncertainty in NH3 measurements is 0.20 ppbv NH3 ± 10 %, based on a spectroscopic calibration method. Field performance of this open-path NH3 sensor is demonstrated, with 10 Hz time resolution and a large dynamic response for in situ NH3 measurements. This sensor provides the capabilities for improved in situ gas-phase NH3 sensing relevant for emission source characterization and flux measurements." @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 id "1656038" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_id 3d25724b-832f-4a61-b0b2-4f2ccecdba94 @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_id ff564c87-78f2-47eb-a857-a4bdc0a71ae5 @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_label "Chemical Meters/Analyzers" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_label "In Situ/Laboratory Instruments" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 path_label "Instruments" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 prefLabel "NH3 QC Laser-Based Sensor" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 reference "https://pdfs.semanticscholar.org/7515/460295a65e6d62d7b8119f010cd6e88d2e3b.pdf" @default.
- c922a16e-a29b-4d0a-8fda-5015767bee37 tag "Instruments" @default.