作者单位
摘要
1 南开大学软件学院,天津 300350
2 南开大学现代光学研究所,天津 300350
盐气溶胶是大气污染监测的重要对象。使用基于高功率超快激光的光丝诱导荧光光谱(FIFS)技术可以实现大气气溶胶的远距离快速定量分析,该技术有望成为下一代激光雷达的核心技术。用NaCl气溶胶模拟大气气溶胶污染物,针对自吸收效应导致光强与物质质量浓度偏离线性关系的问题,提出基于一维卷积神经网络的NaCl气溶胶质量浓度预测模型,并将其与多元线性回归模型、偏最小二乘回归模型、BP传播神经网络模型和定标曲线模型进行了对比实验。在各质量浓度(0.33~6.61 mg/m3)NaCl气溶胶全波段光谱数据集和特征波段光谱数据集上的实验结果表明:所提一维卷积神经网络模型在特征波段光谱数据集上的预测准确率为1,在泛化预测实验中的准确率为0.87,优于其在全波段光谱数据集上的结果,同时也优于其他模型。该模型对自吸收效应下的非线性定量分析具有良好的准确性和鲁棒性,为FIFS技术应用于大气气溶胶质量浓度预测分析提供了可靠的定量分析技术。
光谱学 光丝诱导荧光光谱 NaCl气溶胶定量分析 卷积神经网络 
中国激光
2023, 50(7): 0708007
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China
2 Centre d’Optique, Photonique et Laser (COPL) and D′epartement de physique, de g′enie physique et d’optique, Universit′e Laval, Qu′ebec, Qu′ebec G1V 0A6, Canada
We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.2011CB808103), the Chinese Academy of Sciences and the State Key Laboratory of High Field Laser Physics, the 100 Talents Program of Chinese Academy of Sciences, and theShanghai Pujiang Program.
femtosecond laser filamentation femtosecond laser filamentation filament induced fluorescence spectroscopy filament induced fluorescence spectroscopy laser guided discharges laser guided discharges 
High Power Laser Science and Engineering
2016, 4(1): 010000e8

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