[Research on fiber methane sensing system based on prism gas cell]

Area of Science:

• Optical sensing
• Gas spectroscopy
• Methane detection

Context:

• Accurate methane detection is crucial for safety in industries like coal mining and natural gas transport.
• Existing detection methods may have limitations in range, sensitivity, or adaptability to various environments.
• Fiber-based sensing offers advantages in remote and potentially hazardous area monitoring.

Purpose:

• To develop and validate a novel fiber methane detection system.
• To achieve broad-range concentration detection (0-20%) of methane.
• To demonstrate the system's stability, dynamic response, and adjustable sensitivity.

Summary:

• A fiber methane detection system was engineered by integrating a prism gas cell with a harmonic detection technique.
• The system employs the Beer-Lambert approximation, using a tunable diode laser and the R5 line of methane's 2v3 band for detection.
• Real-time testing validated linear response, stability, and dynamic characteristics, with adjustable sensitivity via a step motor-controlled prism.

Impact:

• The system provides a versatile and adaptable solution for methane monitoring across various concentration levels.
• It can be deployed as a reliable instrument in critical environments such as coalmine tunnels and natural gas pipelines.
• This technology enhances safety and operational efficiency through precise, real-time methane level assessment.