光谱--现代测试技术.ppt

在线环境监测光谱技术的进展及其应用;光谱学的过去;光谱技术的一些实际应用;工业固定污染源排放连续监测系统（CEMS）;SO2及NO2吸收截面温度压力特性研究（郑海明博士）;差分吸收光谱(DOAS);机动车尾气排放道边监测(RSD);RSD现场应用;Broadband Optical Cavity Absorption Spectroscopy in theNear-Ultraviolet: Applications in Atmospheric Chemistry;Outline;Solar Radiation: Initializing tropospheric photochemistry;Tropospheric Photochemistry in near-UV;Spectra : identifying and quantifying molecules;Atmospheric trace gas detection by spectroscopic method ;Incoherent BroadBand Cavity Enhanced Absorption Spectroscopy;Summary of prior IBBCEAS work;Weak absorption spectra in near UV are often poorly known Accurate measurement of absorption spectra in near-UV is particular relevant for tropospheric photochemistry. Weak absorption spectra - α (λ) = N σ (λ) Weak absorption cross-sections (eg. ~10-23 cm2molecule-1 ) Low concentration (reactive radicals eg. BrO ~15 ppt) Aim of the measurement Absorption cross-section: Ozone, the O4 dimer, Acetone, 2-butanone and 2-pentanone Process measurement：BrO, O3 , Br2 ;Flow tube IBBCEAS Spectrometer;SO2 spectra: validation of the instrument;O3 absorption cross-section;;;Field instrument for bromine monoxide (Combined impact Of BRomine and iodine on Arctic atmosphere) ;COBRA campaign of International Polar Year 2008;Near-ultraviolet absorption cross-sections of nitrophenols and their potential influence on tropospheric oxidation capacity *;Chamber studies;;Nitrophenols absorption cross-section spectra ;;Conclusion;Conclusion;Outlook;Acknowledgements;Thanks and Questions;;Aligning the cavity;