Characterization of Time-Resolved Laser-Induced Fluorescence from Crude Oil Samples
LIU De-qing1, LUAN Xiao-ning1, HAN Xiao-shuang1, GUO Jin-jia1, AN Ju-bai2, ZHENG Rong-er1*
1. Optics and Optoelectronics Laboratory, Ocean University of China, Qingdao 266100, China 2. Information Science & Technology College, Dalian Maritime University, Dalian 116026, China
Abstract:To evaluate the feasibility of laser induced time-resolved fluorescence technique for in-situ detection of underwater suspended oil spill, extensive investigations have been carried out with different densities of crude oil samples from six different wells of Shengli Oilfield in this work. It was found that the fluorescence emission durations of these crude oil samples were almost the same, the Gate Pulse Delay of DDG (Digital Delay Generator) in the ICCD started at 52ns and ended at 82ns with a width (FWHM) of 10 ns. It appears that the peak location and lifetime of fluorescence for different crude oil samples varied with their densities, and those with similar densities shared a similar lifespan with the closer peak locations of fluorescence. It is also observed that the peak of fluorescence remained the same location before reaching the maximum intensity, subsequently shift to longer wavelength as fluorescence attenuated from maximum intensity with a red shift among 17~30 nm varied with samples. This demonstrated that the decay rate of fluorescent components in the crude oils was different, and energy transfer between these components might exist. It is hoped that those obtained results and characteristics could be the useful information for identification of suspended spilled-oil underwater.
Key words:Crude oil;Laser induced fluorescence;Time-resolved;Fluorescence lifetime;Red shift of fluorescence peak
[1] Brown C E, Marois R, Myslicki G E, et al. International Oil Spill Conference. American Petroleum Institute, 2003, 2003(1): 779. [2] Camilli R, Reddy C M, Yoerger D R, et al. Science, 2010, 330(6001): 201. [3] An J, Liu Z. Symposium on Photonics and Optoelectronics (SOPO). IEEE, 2012: 1. [4] Coastal Response Research Center (CRRC). Durham, New Hampshire Submerged Oil-State of the Practice and Research Needs, 2007, 1. [5] Fingas M F, Brown C E. Spill Science & Technology Bulletin, 1997, 4(4): 199. [6] Fingas M F, Brown C E. Earth System Monitoring. Springer New York, 2013. 337. [7] Brown C E, Marois R, Myslicki G E, et al. Arctic and Marine Oilspill Program Technical Seminar, 2002, 1: 191. [8] Hansen K A. Arctic and Marine Oilspill Program Technical Seminar, 2010, 2: 1055. [9] Brown C E, Fingas M F. Marine Pollution Bulletin, 2003, 47(9): 477. [10] LI Xiao-long, ZHAO Chao-fang, QI Min-jun, et al(李晓龙, 赵朝方, 齐敏珺, 等). Periodical of Ocean University of China(中国海洋大学学报), 2010,(8): 145. [11] ZHAO Chao-fang, LI Xiao-long, MA You-jun(赵朝方, 李晓龙, 马佑军). Infrared and Laser Engineering(红外与激光工程), 2011, 40(7): 1263. [12] WANG Kun, ZHANG Xin-zheng, WANG Zhen-hua, et al(王 鲲, 张心正, 王振华, 等). Laser Technology(激光技术), 2005, 29(2): 126. [13] LUAN Xiao-ning, WANG Chun-yan, LI Ying, et al(栾晓宁, 王春艳, 李 颖, 等). Transactions of Oceanology and Limnology(海洋湖沼通报), 2009,(2): 151.