High-Sensitivity and In Situ Multi-Component Detection of Gases Based on Multiple-Reflection-Cavity-Enhanced Raman...

Area of Science:

• Analytical Chemistry
• Spectroscopy

Background:

• Raman spectroscopy offers in situ and simultaneous multi-component gas detection.
• Detection sensitivity is limited by low signal collection efficiency.

Purpose of the Study:

• To design and assemble a multi-channel cavity-enhanced Raman spectroscopy system.
• To improve detection sensitivity by optimizing the sample pool and increasing signal collection efficiency.

Main Methods:

• A multi-channel cavity-enhanced Raman spectroscopy system was designed and assembled.
• The sample pool structure was optimized to minimize laser loss and enhance Raman signal excitation.
• Three channels were utilized for collecting Raman signals to boost efficiency.

Main Results:

• Achieved limits of detection (ppm) for CH4, H2, CO2, O2, and N2 were 3.1, 34.9, 17.9, 27, and 35.2, respectively.
• Calibration curves demonstrated excellent linearity (correlation coefficients > 0.999).
• CH4, H2, and CO2 were clearly distinguished at 10, 10, and 50 ppm, respectively, with long-time integration.

Conclusions:

• The developed multi-channel cavity-enhanced Raman system significantly enhances gas detection sensitivity.
• The system shows excellent reliability and linear correlation for quantitative gas analysis.
• It holds broad application prospects for complex field environments.