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9 June 2014 Development of scanning laser sensor for underwater 3D imaging with the coaxial optics
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We have developed the scanning laser sensor for underwater 3-D imaging which has the wide scanning angle of 120º (Horizontal) x 30º (Vertical) with the compact size of 25 cm diameter and 60 cm long. Our system has a dome lens and a coaxial optics to realize both the wide scanning angle and the compactness. The system also has the feature in the sensitivity time control (STC) circuit, in which the receiving gain is increased according to the time of flight. The STC circuit contributes to detect a small signal by suppressing the unwanted signals backscattered by marine snows. We demonstrated the system performance in the pool, and confirmed the 3-D imaging with the distance of 20 m. Furthermore, the system was mounted on the autonomous underwater vehicle (AUV), and demonstrated the seafloor mapping at the depth of 100 m in the ocean.
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Hideaki Ochimizu, Masaharu Imaki, Shumpei Kameyama, Takashi Saito, Shoujirou Ishibashi, and Hiroshi Yoshida "Development of scanning laser sensor for underwater 3D imaging with the coaxial optics", Proc. SPIE 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI, 90800A (9 June 2014);

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