Accession Number : ADA266691


Title :   Estimation of Depth, Orientation, Length and Diameter of Long, Horizontal Ferrous Rods Using a Fluxgate Magnetometer


Descriptive Note : Suffield rept.,


Corporate Author : DEFENCE RESEARCH ESTABLISHMENT SUFFIELD RALSTON (ALBERTA)


Personal Author(s) : McFee, John E ; Ellingson, Robert ; Elliott, John ; Das, Yogadhish


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266691.pdf


Report Date : Apr 1993


Pagination or Media Count : 87


Abstract : A patented hand-held instrument has been built that is the first instrument to explicitly locate ferrous rods parallel to and buried behind or beneath a plane of measurement by analysing magnetic field position data. The instrument has several useful applications, in particular the detection and characterization of reinforcing steel in concrete. The instrument consists of a fluxgate magnetometer and position sensor unit enclosed in a small box which is moved by hand somewhat like a computer mouse. A cable connects the sensor unit to a processor unit, containing a microprocessor, A/D, displays and batteries. An operator scans the sensor unit over the measurement surface, guided by the microprocessor, which controls the simultaneous collection of magnetic and position data. The microprocessor then uses simple algorithms to estimate location parameters, rod length and diameter. This report describes the final version of the instrument. Experimental magnetic data from horizontal rods are presented and compared to two simple models, the infinite cylinder and the long prolate spheroid. It was found that there was very poor agreement between both models and the experimental data. Experiments using the instrument to estimate the parameters of a horizontal ferrous rod buried under a horizontal measurement plane are also described. Reinforcing steel, Reinforcing rod, Concrete, Rebar, Magnetometer, Fluxgate, Magnetic field, Position, Detect, Locate, Identify, Model, Spheroid, Cylinder, Microprocessor, Remnant


Descriptors :   *MAGNETIC FIELDS , *MICROPROCESSORS , *IRON , *MAGNETOMETERS , *RODS , ALGORITHMS , CONTROL , DIAMETERS , DETECTION , PARAMETERS , CANADA , ORIENTATION(DIRECTION) , COLLECTION , EQUATIONS , LENGTH , SURFACES , ESTIMATES , BOXES , STEEL , DEPTH , CONCRETE , REINFORCING MATERIALS , HAND HELD , CABLES , COMPOSITE MATERIALS , COMPUTERS , MODELS , EXPERIMENTAL DATA , MEASUREMENT , POSITION(LOCATION)


Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Computer Hardware
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE