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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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[Laser Tuning Performance Testing and Optimization in TDLAS Oxygen Measuring Systems].

Jun-feng He, Jun Hu, Rui-feng Kan

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|June 30, 2015

Summary

This summary is machine-generated.

This study addresses nonlinear tuning issues in distributed feedback (DFB) laser diodes used for tunable diode laser absorption spectroscopy (TDLAS) oxygen measurements. A compensation method significantly improves wavelength accuracy, enhancing combustion diagnostics.

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Area of Science:

Spectroscopy and Analytical Chemistry
Laser Physics and Engineering
Combustion Science and Engineering

Context:

Tunable diode laser absorption spectroscopy (TDLAS) is a preferred method for combustion process diagnosis due to its high selectivity, speed, and sensitivity.
Distributed feedback (DFB) laser diodes are crucial components in TDLAS systems, offering advantages like small size and narrow linewidth.
The performance of TDLAS oxygen measurements is critically dependent on the precise tuning characteristics of the DFB laser diode.

Purpose:

To experimentally investigate the tuning characteristics (wavelength-current, power-current, wavelength-temperature) of a 764 nm DFB laser diode for TDLAS oxygen sensing.
To identify and quantify nonlinear distortions in the laser diode's tuning curves that impact measurement accuracy.
To develop and validate a compensation scheme to mitigate nonlinear wavelength-current tuning issues.

Summary:

Experimental analysis revealed significant nonlinearities in the wavelength-current and power-current tuning curves of the DFB laser diode, affecting oxygen measurement accuracy.
While temperature tuning exhibited good linearity, wavelength-current tuning showed a nonlinear rate of approximately 0.023 nm/mA.
A compensation method using digital-to-analog (DA) control of injection current, based on polynomial fitting of experimental data, was proposed and implemented.

Impact:

The proposed compensation scheme effectively reduced wavelength-current tuning nonlinearities, with linear fit residuals decreasing from 22 pm to less than 1 μm.
This improvement provides a robust basis for accurate TDLAS-based measurements and inversion of various oxygen parameters in combustion.
The compensation method is simple, requires a one-time polynomial fitting, and does not interfere with the ongoing measurement process.