Open-path Detection Of Atmospheric CH4 And N2O Based On Quantum Cascade Laser

2014 ◽  
Author(s):  
Min Wei ◽  
JianGuo Liu ◽  
RuiFeng Kan ◽  
Wei Wang ◽  
Sun Liqin ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Quantum Cascade ◽  
Open Path ◽  
Ch4 And N2o ◽  
Path Detection

scholarly journals Open-path, quantum cascade-laser-based sensor for high-resolution atmospheric ammonia measurements

2014 ◽  
Vol 7 (1) ◽  
pp. 81-93 ◽  
Author(s):  
D. J. Miller ◽  
K. Sun ◽  
L. Tao ◽  
M. A. Khan ◽  
M. A. Zondlo
Keyword(s):  
Gas Phase ◽  
Quantum Cascade Laser ◽  
High Temporal Resolution ◽  
Reduced Pressure ◽  
Total Uncertainty ◽  
Atmospheric Ammonia ◽  
Quantum Cascade ◽  
Open Path ◽  
Time Calibration

Abstract. 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 pressure-broadened 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.

Quantum cascade laser based sensor for open path measurement of atmospheric trace gases

2017 ◽  
Author(s):  
Hao Deng ◽  
Juan Sun ◽  
Ningwu Liu ◽  
Junya Ding ◽  
Zhou Chao ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Trace Gases ◽  
Atmospheric Trace Gases ◽  
Quantum Cascade ◽  
Open Path ◽  
Path Measurement

Active stand-off detection of gas leaks using an open-path quantum cascade laser sensor in a backscatter configuration

2015 ◽  
Author(s):  
Adrian Diaz ◽  
Benjamin Thomas ◽  
Paulo Castillo ◽  
Barry Gross ◽  
Fred Moshary
Keyword(s):  
Quantum Cascade Laser ◽  
Laser Sensor ◽  
Quantum Cascade ◽  
Open Path ◽  
Gas Leaks
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