光子学报
2023, 52(10): 1052407
Author Affiliations
Abstract
1 State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
2 Tianjin Key Laboratory of Intelligent Control of Electrical Equipment, Tiangong University, Tianjin 300387, China
3 College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Studies on the kinetics of gas-phase chemical reactions currently rely on calculations or simulations and lack simple, fast, and accurate direct measurement methods. We developed a tunable laser molecular absorption spectroscopy measurement system to achieve direct measurements of such reactions by using wavelength modulated spectroscopy and performed online measurements and diagnostics of molecular concentration, reaction temperature, and pressure change during the redox reaction of ozone with nitrogen oxides (NOx) with 0.1 s temporal resolution. This study provides a promising diagnostic tool for studying gas-phase chemical reaction kinetics.
optical sensing wavelength modulated spectroscopy reaction kinetics nitrogen oxides Chinese Optics Letters
2023, 21(1): 011202
1 中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 山东华辰泰尔科技发展有限公司, 山东 济南 250101
研制了一套基于数字反馈稳频的便携式瓦斯浓度遥测装置,采用电流和温度双重反馈稳频的策略抑制了激光器波长的长期漂移,同时也保证了光功率的长期稳定性。实验结果表明,9 h内激光器波长的长期漂移小于1.2 pm,光功率保持稳定,保证了瓦斯浓度的长期连续稳定的测量;不同距离下浓度测量值重复性较好,浓度波动小于5%,满足实际环境中(如天然气管道泄漏、煤矿等)瓦斯浓度测量需求。
激光技术 谐波稳频 波长调制光谱 瓦斯遥测 重复性