Baseline-free scanned-wavelength direct absorption spectroscopy: theoretical analysis and experimental validation

TL;DR

This paper introduces a novel baseline-free scanned-wavelength direct absorption spectroscopy method that improves measurement accuracy by eliminating baseline fitting errors, validated through theoretical analysis and experimental testing.

Contribution

The paper proposes a new BF-SDAS technique that does not require baseline regions, enhancing accuracy in challenging measurement conditions.

Findings

The BF-SDAS method effectively removes baseline fitting errors.

Theoretical analysis confirms the method's validity.

Experimental validation demonstrates accurate H2O concentration measurement.

Abstract

Applicability and accuracy of traditional scanned-wavelength direct absorption spectroscopy (SDAS) diagnostic method is largely affected by combustion state such as temperature and pressure. To resolve this problem, an innovative baseline-free scanned-wavelength direct absorption spectroscopy (BF-SDAS) method is proposed in this work. This method does not need the zero-absorption regions for baseline fitting and can exclude the influence of baseline fitting error on the final result. It is especially suitable for the cases when the scanning range is too narrow or the absorption linewidth is too large to acquire the baseline. In this paper, the BF-SDAS is first derived and theoretically analyzed based on the Fourier analysis, and then the accuracy of this method is validated by measuring the concentration of H2O molecules in a static gas absorption cell at room temperature.