Accession Number : ADD008926
Title : Method and Apparatus for Detecting Subterranean Anomalies by Generating Two Parallel Magnetic Fields.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Hansen,Peder M ; Hoffman,John G ; Seeley,Elwin W ; Andrew,Wesley A
Report Date : 15 Sep 1981
Pagination or Media Count : 6
Abstract : An improved method and apparatus are given for detecting anomalies beneath an area of the earth's surface wherein an oscillator couples a current into two conductors laid parallel to each other to generate two magnetic fields in the earth beneath the area. The magnetic field is measured along a line midway between the two horizontal conductors to detect for an increase in the measured field which is an indication of the presence of an anomaly.
Descriptors : *Patents, *Magnetic detectors, Tunnels, Electric conductors, Magnetic fields, Horizontal orientation, Coupling(Interaction), Earth(Planet), Underground, Anomalies, Oscillators, Surfaces
Subject Categories : Magnetic & Electric Fld Detection & Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE