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Updated: Aug 12, 2025

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

A selective laser-based sensor for fugitive methane emissions.

Mhanna Mhanna¹, Mohamed Sy¹, Aamir Farooq²

¹Mechanical Engineering Program, Physical Science and Engineering Division, Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia.

Scientific Reports

|January 28, 2023

Summary

This summary is machine-generated.

A new mid-infrared laser sensor accurately quantifies methane emissions using cepstral analysis. This technology effectively isolates methane signals, enabling reliable detection even in challenging environments with interfering gases.

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Published on: October 26, 2019

Area of Science:

Environmental Science
Spectroscopy
Laser Technology

Background:

Fugitive methane emissions pose significant environmental challenges.
Accurate quantification of methane is crucial for environmental monitoring and mitigation efforts.
Existing sensing technologies often struggle with baseline noise and spectral interference.

Purpose of the Study:

To develop and report a novel mid-infrared laser-based sensor for quantifying fugitive methane emissions.
To employ cepstral analysis for robust methane detection.
To demonstrate the sensor's efficacy in the presence of interfering species.

Main Methods:

Utilized a distributed feedback inter-band cascade laser operating near 3.3 μm.
Applied wavelength tuning combined with cepstral analysis on molecular free-induction-decay (m-FID) signals.
Optimized scan index and m-FID signal fitting parameters for accurate measurements.

Main Results:

The sensor effectively isolates methane absorbance from baseline laser intensity fluctuations and interfering species like benzene.
Demonstrated accurate methane measurements in the presence of interfering compounds.
Achieved a minimum detection limit of approximately 110 ppm, with potential for enhancement using an optical cavity.

Conclusions:

The developed mid-infrared laser sensor provides a robust method for methane quantification.
Cepstral analysis significantly improves sensor performance by mitigating optical and spectral interferences.
The proposed sensing strategy is suitable for detecting methane leaks in harsh environments and complex atmospheric conditions.