Abstract
We have developed an underwater survey system using a scanning sensor and a GPS (Global Positioning System) sensor instrument that is capable of providing high resolution data in low-visibility water. A laser is used as a light source which limits highly directional pulsed beams with high intensity. Topology is surveyed by detecting the propagation time of pulsed laser beams which are reflected at the bottom of the sea. The laser system is installed in a ship and the beam are introduced to a remotely-operated-vehicle (ROV) through an optical fiber. The extremely high propagation velocity of the beam in the water compared with that of an ultrasonic beam and the scanning survey system enable us to measure a large area within a short time. A deeper system has been designed and will have a 50 m depth capability.
