Artificial Peak Laser Absorption Spectroscopy: Simultaneous Quantification of Temperature and Concentration with Extended Dynamic Range

This study presents an innovative calibration-free artificial peak-laser absorption spectroscopy (AP-LAS) technique that fundamentally overcomes the inherent dynamic range-sensitivity trade-off and eliminates reliance on specific absorption line pairs for multiparameter measurements in laser absorption spectroscopy. By implementing a unique signal-driven and wavelength-tuning mechanism, the proposed approach generates tailored artificial absorption peaks within a single natural spectral line, enabling simultaneous temperature and concentration quantification. This method is validated through CO absorption experiments in a high-temperature, high-pressure shock tube environment. Experimental results demonstrate that the AP-LAS technique significantly extends the detectable concentration range by 4 times compared to conventional methods while maintaining excellent linearity. The technique achieves enhanced dynamic range and multiparameter quantification performance without requiring matched absorption line pairs under extreme conditions. These advancements highlight AP-LAS technique as a promising solution for real-time gas monitoring in demanding applications such as combustion diagnostics.