Quantitative analysis for nonlinear fluorescent spectra based on edges matching  

作　　者：CHEN Yang,ZHANG TaiNing,GUO Peng,WANG XiangHui & CHANG ShengJiang Institute of Modern Optics,Key laboratory of Opto-electronic Information Science and Technology of Ministry of Education,Nankai University,Tianjin 300071,China 

出　　处：《Science China(Technological Sciences)》2010年第5期1190-1197,共8页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China ("973" Program) (Grant No.2007CB310403);the Key Program of the Natural Science Foundation of Tianjin (Grant No.07JCZDJC05500);the National Natural Science Foundation of China (Grant Nos.60772105,10704043)

摘　　要：A novel spectra-edge-matching approach is proposed for the quantitative analysis of the nonlinear fluorescence spectra of the air impurities excited by a femtosecond laser.The fluorescence spectra are first denoised and compressed,both by wavelet transform,and several peak groups are then picked from each spectrum according to a threshold of intensity and are used to extract the spectral features through principal component analysis.It is indicated that the first two principle components actually cover up to 98% of the total information and are sufficient for the final concentration analysis.The analysis reveals a monotone relationship between the spectra intensity and the concentration of the air impurities,suggesting that the femtosecond laser induced fluorescence spectroscopy along with the proposed spectra analysis method can become a powerful tool for monitoring environmental pollutants.A novel spectra-edge-matching approach is proposed for the quantitative analysis of the nonlinear fluorescence spectra of the air impurities excited by a femtosecond laser.The fluorescence spectra are first denoised and compressed,both by wavelet transform,and several peak groups are then picked from each spectrum according to a threshold of intensity and are used to extract the spectral features through principal component analysis.It is indicated that the first two principle components actually cover up to 98% of the total information and are sufficient for the final concentration analysis.The analysis reveals a monotone relationship between the spectra intensity and the concentration of the air impurities,suggesting that the femtosecond laser induced fluorescence spectroscopy along with the proposed spectra analysis method can become a powerful tool for monitoring environmental pollutants.

关 键 词：NONLINEAR fluorescence SPECTRUM feature MATCHING EDGES of SPECTRUM 

分 类 号：O657.3[理学—分析化学]