Small hyperspectral imagers and lidars and their marine applications

Ocean is an important part of the earth's ecological environment. Exploration and exploitation of marine resources may easily cause serious damage to ocean, such as large-scale oil spill, pollution and red tide caused by oil and gas exploitation. Hyperspectral imaging technology can obtain both image information and spectral information at the same time, and has important applications in marine in-situ detection. In this paper, some recent works about hyperspectral imagers are reviewed, including a small-scale hyperspectral imager combined with fluorescence technology for the classification of oil spills and the estimation of oil film thickness, a multi-mode hyperspectral marine in-situ detection system (in three modes:common reflection or transmission imaging, telescopic imaging and microscopic imaging) for hyperspectral detection of different algae and spores of some fish infectious disease carriers. Hyperspectral technology combined with lidar technology has great potential in monitoring oil spill, red tide and other marine pollutants. An inelastic hyperspectral Scheimpflug lidar system and a ligh-sheet Scheimpflug lidar system are also reviewed. The former is for the type identification of oil spills through the fluorescence spectrum of oil spills, and the latter is for the detection of the 3D shapes of some manikin, shells and corals with the refraction correction at the air-water interface.