Communications: electrical – Underwater – Electrodes and electrode systems
Patent
1991-08-16
1993-04-27
Eldred, J. Woodrow
Communications: electrical
Underwater
Electrodes and electrode systems
324326, 324235, 324 72, 324 725, H04B 1302
Patent
active
052066401
ABSTRACT:
A system for detecting and positioning objects, the electric conductivity of which differs from the surrounding medium thereof by measuring variations in an electric field generated into the medium. More precisely, the invention concerns a method and assembly for detecting objects or objectives, for example vessels, in electrically conductive medium, for example sea, by measuring changes, disturbances, signs, indications or the like caused by the object or objective, especially for surveying water fairways and/or extent. According to the invention, electric current is supplied in the extent to be surveyed via electrodes, magnitude of the current or magnitude of an electric field caused by the current is continuously or uncontinuously measured at selective points by a measuring device for observing when any object or objective to be detected is undetectable in the surveillance extent and when an object or objective to be detected is detectable is in the surveillance extent, and that measurement results originating from an undetectable object or objective and detectable object or objective are compared and differences observed are utilized for detection and/or positioning of the object or objective.
REFERENCES:
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patent: 3526831 (1970-09-01), Smith
patent: 3562633 (1971-02-01), Swain
patent: 3668617 (1972-06-01), Brainard, II
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Hirvonen Esko
Niinivaara Juhani
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