Title :
A novel laser radar system for subsea inspection and mapping
Author :
Klepsvik, John O. ; Bjarnar, Morten ; Brosstad, Per Ø ; Braend, D.A. ; Westrum, Herleif
Author_Institution :
Seatex A/S, Trondheim, Norway
Abstract :
A prototype Laser Imaging and Ranging (LIMAR) system for subsea applications has been developed and tested. The LIMAR system uses a Q-switched frequency-doubled Nd:YLF solid state laser operating at a wavelength of 526 nm (green). Images and maps of underwater scenes are obtained by scanning the laser beam across the objects in a raster pattern using an optical scanner, which can be operated in both a linescan mode and 2D scan mode. The system has a cross-track FOV of 90° and is capable of processing and displaying up to 4000 points per sec., which gives a resolution comparable to video at typical ROV speeds of 0.5 to 2 m/s in the linescan mode of operation
Keywords :
bathymetry; cameras; geophysical equipment; measurement by laser beam; oceanographic equipment; optical radar; optical scanners; remote sensing by laser beam; seafloor phenomena; 526 nm; LIMAR; Laser Imaging and Ranging; Nd; Nd:YLF; Q-switched frequency-doubled; bathymetry ocean optical imaging system; camera; geophysical method; green; laser imaging; laser radar system; measurement technique equipment; ocean bottom; optical scanner; raster pattern; seafloor mapping; solid state laser; subsea inspection; underwater; underwater scene; Frequency; Inspection; Laser modes; Laser radar; Layout; Optical imaging; Prototypes; Radar imaging; Solid lasers; System testing;
Conference_Titel :
OCEANS '94. 'Oceans Engineering for Today's Technology and Tomorrow's Preservation.' Proceedings
Conference_Location :
Brest
Print_ISBN :
0-7803-2056-5
DOI :
10.1109/OCEANS.1994.364131
