To read this content please select one of the options below:

New technology for subsea laser imaging and ranging system for inspection and mapping

Paul M. Evans (Director at Seatex Ltd, Suite 1, Old Skeene Road, Westhill, Aberdeen, AB32 6RL, UK. Tel: +44 (0) 1244 744 625; Fax: +44 (0) 1244 744 626; E‐mail: PME@Seatex.demon.co.uk.)
John O. Klepsvik (Seatex A/S, Trondheim, Norway)
Morten L. Bjarnar (Seatex A/S, Trondheim, Norway)

Sensor Review

ISSN: 0260-2288

Article publication date: 1 June 1998

705

Abstract

Laser imaging and ranging systems offer 3‐D imaging of video quality at distances four to five times greater than conventional video and photographic systems. The Spotmap system is based on the laser radar approach, using a pulsed green solid state laser as a transmitter and detecting the time‐of‐flight and peak intensity of the reflected pulses. Images and maps of underwater scenes are obtained by scanning the laser beam across the objects in a raster pattern using a two‐axis optical scanner. The system can be used both in linescan and 2D scan modes of operation such that images can be obtained either from the linear movement of the remotely operated vehicle or from a stationary position. The system has a 90∞ cross‐track FOV and is capable of processing 8,000 points per second, which gives an imaging resolution comparable to video at ROV speeds up to 2m/s.

Keywords

Citation

Evans, P.M., Klepsvik, J.O. and Bjarnar, M.L. (1998), "New technology for subsea laser imaging and ranging system for inspection and mapping", Sensor Review, Vol. 18 No. 2, pp. 97-107. https://doi.org/10.1108/02602289810209902

Publisher

:

MCB UP Ltd

Copyright © 1998, MCB UP Limited

Related articles