Abstract
We have developed an underwater survey system using a scanning Laser sensor and a GPS (Global Positioning System) sensor instrment that is capable of providing high resolution data in low -visibility water. A laser is used as a light source which highly directional pulsed beams with high intensity.
Topography is surveyed by detecting the propagation time of the pulsed laser beams which are reflected at the bottom of the sea. The laser system is installed in a ship and the beams are introduced to a ROV (Remotely-Operated-Vehicle) 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.
