Fugitive methane detection using open-path stand-off chirped laser dispersion spectroscopy

2021 ◽  
Author(s):  
Yifeng Chen ◽  
Michael Soskind ◽  
James McSpiritt ◽  
JIE LIU ◽  
Rui Wang ◽  
...  
Keyword(s):  
Open Path ◽  
Methane Detection

Open-path spectroscopic methane detection using a broadband monolithic distributed feedback-quantum cascade laser array

2017 ◽  
Vol 56 (11) ◽  
pp. E23 ◽  
Author(s):  
Anna P. M. Michel ◽  
Jason Kapit ◽  
Mark F. Witinski ◽  
Romain Blanchard
Keyword(s):  
Quantum Cascade Laser ◽  
Distributed Feedback ◽  
Laser Array ◽  
Quantum Cascade ◽  
Open Path ◽  
Methane Detection

Workload Perception of Air Traffic Control Officers and Pilots During Continuous Descent Operations Approach Procedures

2019 ◽  
Vol 9 (1) ◽  
pp. 2-11
Author(s):  
Marina Efthymiou ◽  
Frank Fichert ◽  
Olaf Lantzsch
Keyword(s):  
Fuel Consumption ◽  
Traffic Control ◽  
Air Traffic Control ◽  
Negative Impact ◽  
Air Traffic ◽  
Reduce Fuel Consumption ◽  
Total Load ◽  
Open Path

Abstract. The paper examines the workload perceived by air traffic control officers (ATCOs) and pilots during continuous descent operations (CDOs), applying closed- and open-path procedures. CDOs reduce fuel consumption and noise emissions. Therefore, they are supported by airports as well as airlines. However, their use often depends on pilots asking for CDOs and controllers giving approval and directions. An adapted NASA Total Load Index (TLX) was used to measure the workload perception of ATCOs and pilots when applying CDOs at selected European airports. The main finding is that ATCOs’ workload increased when giving both closed- and open-path CDOs, which may have a negative impact on their willingness to apply CDOs. The main problem reported by pilots was insufficient distance-to-go information provided by ATCOs. The workload change is important when considering the use of CDOs.

Open-path and extractive FTIR environmental monitoring above and below the ground

1995 ◽  
Author(s):  
William G. Fateley ◽  
Robert M. Hammaker ◽  
Charles T. Chaffin, Jr. ◽  
Timothy L. Marshall
Keyword(s):  
Environmental Monitoring ◽  
Open Path

Low-power, open-path mobile sensing platform for high-resolution measurements of greenhouse gases and air pollutants

2015 ◽  
Vol 119 (1) ◽  
pp. 153-164 ◽  
Author(s):  
Lei Tao ◽  
Kang Sun ◽  
David J. Miller ◽  
Dan Pan ◽  
Levi M. Golston ◽  
...  
Keyword(s):  
High Resolution ◽  
Greenhouse Gases ◽  
Low Power ◽  
Air Pollutants ◽  
Mobile Sensing ◽  
Open Path ◽  
Sensing Platform

Novel Fiber-Optic Sensing System for Detection of Methane

2013 ◽  
Vol 562-565 ◽  
pp. 1008-1015 ◽  
Author(s):  
Shu Tao Wang ◽  
Peng Wei Zhang ◽  
Quan Min Zhu
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Step Motor ◽  
Harmonic Detection ◽  
Distributed Feedback Laser ◽  
Gas Cell ◽  
Response Characteristics ◽  
The Stability ◽  
Application Fields ◽  
Methane Detection

Based on DFBLD (Distributed Feedback Laser Diode) and harmonic detection technique, a novel fiber-optic methane detection system is constructed. The system can be applied to broad-range concentration detection of methane. Based on the approximation express of the law of Beer-Lambert, detection of methane with various concentration from 0% to 20% is completed using subtraction of background and ratio processing method, as the atmosphere surroundings are treated as background noise. The direct absorption spectra for various concentration is measured using GRIN gas cell, combined with DFBLD. The R5 line of the 2v3 band of methane is selected as the absorption peak. The system is tested online during gas mixing process and the linear relationship between system indication and concentration variation is validated. Also the stability and dynamic response characteristics are confirmed by the experiments. The sensitivity of the system can be adjusted according to the concentration level of various field environments by changing the prism distance using step motor. In the range of 0% to 20% the sensitivity of methane detection can arrive at 0.001%. So the system can be applied to various application fields and adopted as monitoring instruments for coalmine tunnel and natural pipeline.

Use of an open-path FTIR sensor at Camacari Petrochemical Complex--Bahia, Brazil

1995 ◽  
Author(s):  
Neuza Neves ◽  
Elizabeth d. R. Couto ◽  
Robert H. Kagann
Keyword(s):  
Petrochemical Complex ◽  
Open Path
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