多通道海洋荧光激光雷达溢油监测系统

Multi-channel ocean fluorescence lidar system for oil spill monitoring

主要介绍了可用于海上溢油监测的多通道海洋荧光激光雷达系统及实验研究。该激光雷达系统采用Nd：YAG激光器三倍频激光（355 nm）作为探测光源,使用口径为20 cm的卡塞格林望远镜接收海面返回的荧光信号,经光栅光谱仪分光后对380~690 nm范围内的荧光信号进行采集。通过实验室激光诱发油样本的荧光数据分析,研究了不同溢油种类的荧光光谱特征,并给出了区分溢油污染程度的快速分析方法。2009年以来在青岛近海进行多次实验并分析不同的海面污染类型和污染程度,实验结果表明,该雷达系统海面溢油监测性能可靠,能够准确判别溢油种类,并可区分溢油污染程度。最后讨论了雷达探测中存在的噪声影响。

A multi-channel ocean fluorescence lidar system for oil spill monitoring（MOFLOS） was introduced.In this system,the third harmonic of a Nd：YAG laser（at 355 nm） was used as the excitation source,and the backscattered fluorescence from sea surface collected by a 20 cm Cassegrain telescope was dispersed by a diffraction grating spectrometer with the spectral range of 380-690 nm.The oil fluorescence spectrum classification was studied on the basis of the characteristics of oil samples′ fluorescence spectra measured in the laboratory,and a method was given to classify the different levels of water quality deviating from normal state due to oil pollution.The lidar was used to carry out several field experiments since 2009,and various types and extents of oil pollution on the surface of seawater were measured and analyzed.All these experimental results show that the ocean fluorescence lidar system owns the capability of detecting oil spill at ocean surface,identifying the oil type and distinguishing the levels of oil pollutions.Finally,the impacts of solar background and system signal-to-noise were discussed.