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Updated: Apr 12, 2026

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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
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[Measurement of oxygen concentration using multimode diode laser absorption spectroscopy]
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|May 22, 2015
Summary
A novel tunable diode laser absorption spectroscopy system (TDLAS) offers stable, cost-effective oxygen monitoring. This advanced TDLAS method achieves high accuracy and reliability for industrial and environmental applications.
Area of Science:
- Optical spectroscopy
- Laser-based gas sensing
- Analytical chemistry
Context:
- Tunable diode laser absorption spectroscopy (TDLAS) is crucial for environmental monitoring, industrial process control, and biomedical sensing.
- Existing TDLAS systems face challenges including high cost, poor stability, and wavelength shift.
- A multi-mode diode laser system combining correlation spectroscopy and wavelength modulation spectroscopy (TMDL-COSPEC-WMS) was developed to address these limitations.
Purpose:
- To develop and evaluate a cost-effective, stable, and accurate multi-mode diode laser system for oxygen (O2) concentration measurement.
- To improve the signal-to-noise ratio and stability of TDLAS systems using correlation spectroscopy harmonic detection.
- To demonstrate the system's capability for online oxygen monitoring in various environments.
Summary:
- A multi-mode diode laser system (TMDL-COSPEC-WMS) was employed to measure O2 concentrations (1%-30%) near 760nm.
- The system utilizes a dual-beam approach with correlation spectroscopy and harmonic detection for enhanced stability and signal quality.
- Experimental results show a good linear relationship between measured and actual O2 concentrations, with a detection limit of 280 ppm·m and a standard deviation of 0.056% for continuous ambient air monitoring.
Impact:
- The developed TMDL-COSPEC-WMS system provides a stable, reliable, and potentially lower-cost alternative for oxygen monitoring.
- The system's simple design and ease of use facilitate application in complex industrial and environmental settings.
- This technology supports enhanced online monitoring capabilities for oxygen, crucial in various scientific and industrial fields.
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