School of Physics, Harbin Institute of Technology, Harbin 150001, China.
School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China.
Analyst. 2022 Sep 26;147(19):4365-4370. doi: 10.1039/d2an00865c.
High-sensitivity trace oxygen sensing based on far-ultraviolet absorption spectroscopy was realized. The far-ultraviolet absorption spectrum of oxygen in the wavelength range of 170-200 nm at normal pressure was measured, and the maximum oscillation absorption peak occurred close to 180.18 nm. Through error analysis, the optimal wavelength range for accurate and sensitive oxygen measurements by ultraviolet absorption spectroscopy was identified as 180-189 nm. A total column (CL) calibration curve for oxygen was established, and the maximum optical path length () of the system was determined to be 0.75(3) m by comparing the oxygen absorption with and without the sample cell. The oxygen detection sensitivity was 232 m, and the lowest detection limit was 12 ppm at the optical path length. The highly sensitive trace oxygen sensing based on far-ultraviolet absorption spectroscopy exhibited significant potential for application with regard to nitrogen protection.
基于远紫外吸收光谱的高灵敏度痕量氧传感得以实现。测量了常压下氧在 170-200nm 波长范围内的远紫外吸收光谱，最大振荡吸收峰出现在 180.18nm 附近。通过误差分析，确定了紫外吸收光谱法进行准确、灵敏氧测量的最佳波长范围为 180-189nm。建立了氧气总柱（CL）校准曲线，并通过比较有和没有样品池的氧气吸收，确定了系统的最大光程（）为 0.75(3)m。氧气检测灵敏度为 232m，在 光学路径长度下，最低检测限为 12ppm。基于远紫外吸收光谱的高灵敏度痕量氧传感在氮气保护方面具有显著的应用潜力。
