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Improved low concentration gas detection system based on intracavity fiber laser
Hongxia Zhang1, Kun Liu, Dagong Jia
1College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin, China. hxzhang@tju.edu.cn
The Review of Scientific Instruments
|March 3, 2011
Summary
This study enhances a low concentration gas detection system using an intracavity fiber laser. The improved system effectively detects acetylene down to 100 ppm, validating its performance for sensitive gas analysis.
Area of Science:
- Optics and Photonics
- Gas Sensing Technology
- Laser Spectroscopy
Background:
- Low concentration gas detection is crucial for environmental monitoring and industrial safety.
- Intracavity fiber laser systems offer high sensitivity for gas sensing applications.
- Optimizing system design and components can significantly improve detection limits.
Purpose of the Study:
- To propose and validate an improved low concentration gas detection system based on intracavity fiber laser.
- To enhance the sensitivity and effectiveness of gas detection using optimized system components and techniques.
- To demonstrate the system's capability for detecting specific low concentration gases like acetylene.
Main Methods:
- The system's sensitivity was theoretically deduced using the Lambert-Beer law.
- An optimized gas cell was designed and fabricated for enhanced performance.
- A wavelength independent Faraday rotation reflector replaced the fiber Bragg grating reflector to enable wavelength sweeping.
- The average of three absorption spectra was used to improve detection accuracy.
- Acetylene detection coefficients of variation at different concentrations were measured.
Main Results:
- The improved system achieved a sensitivity of less than 100 ppm for acetylene detection.
- The use of wavelength sweeping and spectral averaging enhanced detection reliability.
- The system demonstrated effective validation for low concentration gas measurement.
- Coefficients of variation were analyzed to assess detection stability across concentrations.
Conclusions:
- The enhanced intracavity fiber laser system provides effective detection of low concentration gases.
- The modifications, including the Faraday rotation reflector and spectral averaging, significantly improved system sensitivity and reliability.
- The validated system shows promise for various applications requiring precise gas concentration monitoring.
