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A hydroxyl radical detection system using gas expansion and fast gating laser-induced fluorescence techniques

Journal of Environmental Sciences 2018年第3期30卷 190-200页

作者： Hao Chen Renzhi Hu Pinhua Xie Xingbiao Xing Liuyi Ling Zhiyan Li Fengyang Wang Yihui Wang Jianguo Liu Wenqing Liu Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Institute of Electric and Information Technology Anhui University of Science and Technology

An OH radical measurement instrument based on fluorescence assay by gas expansion（FAGE）has been developed in our *** air is introduced into a low-pressure fluorescence cell through a pinhole aperture and irradiated by a dye laser at a high repetition rate of 8.5 k *** OH radical is both excited and detected at 308 nm using A-X（0,0）*** satisfy the high efficiency needs of fluorescence collection and detection,a 4-lens optical system and a self-designed gated photomultiplier（PMT）is used,and gating is actualized by switching the voltage applied on the PMT dynodes.A micro channel photomultiplier（MCP）is also prepared for fluorescence *** the weak signal is accumulated by a photon counter in a specific *** OH radical excitation spectrum range in the wavelength of 307.82–308.2 nm is detected and the excited line for OH detection is determined to be Q1（2）*** calibration of the FAGE system is researched by using simultaneous photolysis of H2O and *** minimum detection limit of the instrument using gated PMT is determined to be 9.4×10~5molecules/cm^3,and the sensitivity is 9.5×10^（-7）cps/（OH·cm^（-3））,with a signal-to-noise ratio of 2 and an integration time of 60 sec,while OH detection limit and the detection sensitivity using MCP is calculated to be 1.6×10~5molecules/cm^3and 2.3×10^（-6）cps/（OH·cm^（-3））.The laboratory OH radical measurement is carried out and results show that the proposed system can be used for atmospheric OH radical measurement.

关键词： OH radical Laser-induced fluorescence fluorescence assay by gas expansion Photomultiplier Photon counting

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