- Significant advancements in differential optical absorption spectroscopy (DOAS) for monitoring atmospheric pollutants have been achieved, focusing on improving detection limits without sacrificing measurement accuracy.
- An algorithm combining traditional DOAS with Kalman filtering was developed, resolving issues of inversion accuracy and enhancing measurement precision for SO2 in flue gases.
- The study found that with an optimal differential optical density threshold (OD'm) below 0.0481, SO2 measurement precision is high, while measurements become inaccurate if OD'm exceeds 0.922, necessitating linearity corrections.