A Closed Optical Path Trace H 2 S Sensing System Based on Vacuum Ultraviolet Differential Absorption Spectroscopy Combined with Reconstructed Domain Point Cloud Segmentation

作者：Mu Li, Rui Zhu, Jie Gao, Fei Xie, Changyin Li, Yuming Luo, Yu Zhang, Yungang Zhang, Yungang Zhang, Yungang Zhang · 发表于：ACS Sensors · 年份：2025 · DOI：10.1021/acssensors.5c01887 · 被引用次数：14 · 研究领域：Spectroscopy and Laser Applications、Advanced Chemical Sensor Technologies、Gas Sensing Nanomaterials and Sensors

Accurate detection of trace hydrogen sulfide (H 2 S) plays an indispensable role in the fields of industrial emission reduction and power troubleshooting. In view of the oscillatory absorption characteristics of H 2 S in the 185–210 nm band, ultraviolet differential optical absorption spectroscopy (UV-DOAS) has been recognized as a promising technique for measuring H 2 S concentrations. However, spectral overlap caused by the presence of oxygen (O 2 ) in the open optical path and in the mixture, along with the irregular absorption characteristics of H 2 S, makes it challenging to assess trace H 2 S concentrations using the vacuum ultraviolet band. In this study, we propose a closed optical path H 2 S sensing system based on vacuum ultraviolet absorption spectroscopy combined with reconstructed domain point cloud segmentation. First, a closed optical path structure is used to eliminate O 2 present in the optical path gaps. Then we present a spectral line analysis method based on sinusoidal spectral reconstruction (SSR) combined with point cloud segmentation. This approach effectively eliminates spectral interference of O 2 on H 2 S spectra within the reconstructed domain. Finally, the irregular absorption features of H 2 S are organized to facilitate the accurate measurement of H 2 S at low concentrations. Results reveal that the sensing system can measure H 2 S dynamically at low concentrations using the vacuum ultraviolet band, with a mean relative error (MRE) of 1.61%. Mean...