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Development of gas sensing system for methane detection using differential optical absorption spectroscopy (doas) technique in the near-infrared (nir) region / Sayma Khandaker

By:

Sayma Khandaker [author.]

Material type: Text

text

Media type:

unmediated

Carrier type:

volume

ISBN:

THE0010377 (Local)

Subject(s):

Dissertation note: Thesis (Master of Science) -- Universiti Malaysia Pahang - 2025 Abstract: Methane (CH4) plays a pivotal role in climate change and industrial safety, yet its detection and monitoring remain challenging due to limitations in existing methods. This thesis explores the development of a methane gas sensing system utilizing the Differential Optical Absorption Spectroscopy (DOAS) technique. The system is designed to enhance detection significance. Key objectives include identifying the optimal wavelength in the Near-Infrared (NIR) region for methane detection. The study demonstrates the selection of 883 nm as the optimum wavelength for methane detection based on theoretical and experimental analyses. Laboratory experiments were conducted using a robust optical-based DOAS setup. The cross-sensitivity analysis is conducted to confirm the ability of DOAS to effectively differentiate CH4 from other atmospheric gases such as O2, CO2, and water vapor. A comparative analysis with the commercial MESTEK CGD02A sensor further validates the reliability of DOAS system. A total of six experimental tests were conducted. Among them, While Tests 1 and 3 yielded significant detection results for the DOAS system, the remaining four tests show slightly higher values for the commercial sensor, with an average error-percentage of 3.38%, which meets the laboratory standard for instruments with good precision. This research advances the application of DOAS in methane detection by providing an efficient solution for industrial and environmental monitoring. The proposed system addresses gaps in current technologies by offering broader spatial coverage and real-time detection capabilities, critical for mitigating methane emissions and improving industrial safety. The outcomes align with global climate mitigation goals and emphasize the importance of innovative sensing technologies in addressing greenhouse gas emissions.

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Holdings ( 2 )
Title notes ( 4 )

Holdings
Item type	Current library	Call number	Status	Date due	Barcode
Thesis	UMPLIB PEKAN	FTKEE .H39 2025 r Thesis (Browse shelf(Opens below))	Not for loan		T000004042
Thesis	UMPLIB PEKAN	CD13933 (Browse shelf(Opens below))	Final Processing		T000004043

Faculty of Electrical & Electronics Engineering Technology

Thesis (Master of Science) -- Universiti Malaysia Pahang - 2025

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Methane (CH4) plays a pivotal role in climate change and industrial safety, yet its detection and monitoring remain challenging due to limitations in existing methods. This thesis explores the development of a methane gas sensing system utilizing the Differential Optical Absorption Spectroscopy (DOAS) technique. The system is designed to enhance detection significance. Key objectives include identifying the optimal wavelength in the Near-Infrared (NIR) region for methane detection. The study demonstrates the selection of 883 nm as the optimum wavelength for methane detection based on theoretical and experimental analyses. Laboratory experiments were conducted using a robust optical-based DOAS setup. The cross-sensitivity analysis is conducted to confirm the ability of DOAS to effectively differentiate CH4 from other atmospheric gases such as O2, CO2, and water vapor. A comparative analysis with the commercial MESTEK CGD02A sensor further validates the reliability of DOAS system. A total of six experimental tests were conducted. Among them, While Tests 1 and 3 yielded significant detection results for the DOAS system, the remaining four tests show slightly higher values for the commercial sensor, with an average error-percentage of 3.38%, which meets the laboratory standard for instruments with good precision. This research advances the application of DOAS in methane detection by providing an efficient solution for industrial and environmental monitoring. The proposed system addresses gaps in current technologies by offering broader spatial coverage and real-time detection capabilities, critical for mitigating methane emissions and improving industrial safety. The outcomes align with global climate mitigation goals and emphasize the importance of innovative sensing technologies in addressing greenhouse gas emissions.