Abstract
A tanker accident is a potential crisis leading to severe ocean pollution. The operation for recovering oil spill needs precise information of position, scale and type of oil. A new oil spill monitoring system is required in full-time and all-weather wide area coverage. National, Maritime Research Institute (NMRI) developed a new helicopter-based fluorescence imaging lidar (laser radar) system for remote sensing of oil spill. It consists of a 355nm UV pulsed laser, four-wavelength optical systems, and a gated ICCD imaging camera. Since this system discriminates the oil from seawater by the presence of laser induced fluorescence light, it is possible to visualize the oil spill in all weather, day or night. Not only diesel, fuel or crude oil, but also some petroleum chemicals on the ocean, normally hard to identify with the naked eye, can be targeted.The first oil spill observation was conducted on May 2004 on the French coast in collaboration with DEPOL04, the international oil spill observation and recovery experiment. We succeeded in observing the 2-D images of the fluorescent light from artificially-spilled oil, and the water Raman scattering light from sea water. The discrimination of oil and water was examined by the signal ratio of the three wavelength signals to the 405nm signal, which is water Raman dominant.
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