Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1996-10-28
1998-06-09
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324247, 324345, 324365, G01V 308, G01V 3165, G01V 338, G01R 3302
Patent
active
057640610
ABSTRACT:
A remotely operated submersible robot 10 is provided with two differential triaxial orthogonal dc magnetic sensing units, 1 and 2, each comprising two triaxial orthogonal dc magnetic sensors spaced at a predetermined distance apart and with their corresponding axes set in parallel; each triaxial orthogonal dc magnetic sensor incorporating three dc magnetic sensing elements sensitive only to a magnetic field in a specific axial direction and disposed such that the axial directions of respective dc magnetic sensing elements cross each other at right angles. Analog signals sent out from the differential triaxial orthogonal dc magnetic sensing units 1 and 2 are converted into digital signals by an analog-to-digital converter, and transmitted to a mother ship 20 via a tether cable 6. The output signals thus transmitted from the aforesaid sensing units are processed by a processing unit installed in the mother ship 20 to compute the distance to a submarine cable, a difference in elevation between the submarine cable and the submersible robot, and the direction of the submarine cable laid down, which are shown on a display.
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patent: 5321361 (1994-06-01), Goodman
Francis, Samuel H.; Magnetic Localization of AC/Driven Buried Cable By The SCARAB Submersible, Oceans'76 MTS-IEEE Paper, Conference Washington, D.C. Sep. 13-15, 1976, pp. 24B-1-24B-7.
Asakawa Kenichi
Takagi Satoru
Kokusai Denshin Denwa Kabushiki Kaisha
Strecker Gerard R.
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