Title :
Ultra high resolution sub-bottom profiling for detection of thin layers and objects
Author :
Dybedal, J. ; Boe, R.
Author_Institution :
Bentech Subsea AS, Stjordal, Norway
Abstract :
Due to the increased focus on polluted sedimentation and detection of buried objects a sub-bottom profiler suited for application in detection thin sediment layers and buried objects has been developed. The system is based on a parametric array for producing very narrow, low frequency beams. The acoustic beam can be steered electronically to both sides making it possible to cover a 3D volume of sub-bottom sediments as the profiler is moved ahead. Furthermore this type acoustic source has an inherent high relative bandwidth and virtually no ringing resulting in a very high spatial resolution. Examples of results obtained with the system are shown
Keywords :
geophysical equipment; geophysical techniques; object detection; oceanographic equipment; oceanographic techniques; seafloor phenomena; sediments; seismology; sonar; acoustic array method; acoustic source; buried object; geophysical measurement technique; high resolution sub-bottom profiling; marine sediment; polluted sediment; profiler; seafloor geology; seismology; sonar; steered beam; subsea object; thin layer; underground object detection; underwater object; Acoustic arrays; Acoustic beams; Acoustic devices; Acoustic transducers; Bandwidth; Frequency; Object detection; Signal resolution; Space vector pulse width modulation; Spatial resolution;
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.1994.363973
