All-Fiber Multicomponent Gas Raman Probe Based on Platinum-Coated Capillary Enhanced Raman Spectroscopy

Area of Science:

• Spectroscopy
• Materials Science
• Optical Engineering

Background:

• Conventional gas Raman probes often require bulky optical components like filters.
• Interference signals and environmental factors can degrade probe performance.
• Developing compact, sensitive, and stable gas detection systems is crucial for various applications.

Purpose of the Study:

• To present a compact all-fiber multicomponent gas Raman probe.
• To eliminate the need for conventional optical components through a novel fiber architecture.
• To enhance gas Raman signal reception and overall system performance.

Main Methods:

• Utilized a dual-fiber architecture within a platinum-coated capillary.
• Employed atomic layer deposition (ALD) for platinum coating on silica capillaries (metal-coated capillary - MCC).
• Optimized dual fiber alignment within the MCC to enhance signal-to-noise ratio.

Main Results:

• Achieved detection limits of 21 ppm for methane (CH4), 30 ppm for ethylene (C2H4), and 51 ppm for ethane (C2H6).
• Demonstrated a rapid response time of 25 s and robust system stability.
• The MCC design showed excellent optical properties and environmental resilience.

Conclusions:

• The compact all-fiber Raman probe offers a streamlined and practical solution for multicomponent gas detection.
• The metal-coated capillary approach effectively suppresses interference and enhances signal reception.
• The developed probe has significant potential for applications in agriculture, industry, environmental monitoring, and healthcare.