ESTIMATION OF DEPTH, ORIENTATION, LENGTH AND DIAMETER OF LONG, HORIZONTAL FERROUS RODS USING A FLUXGATE MAGNETOMETER

Authors
  1. McFee, J.E.
  2. Ellingson, R.
  3. Elliott, J.
  4. Das, Y.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
The 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. It was seen that all the location parameters (rod orientation, end locations, depth) of typical reinforcing rod could be estimated with reasonable accuracy at depths of 8 to 18 cm using very simple linear equations. Estimation of rod diameter was unreliable chiefly due to the presence of substantial remnant magnetization.
Report Number
DRES-585 —
Date of publication
01 Apr 1993
Number of Pages
80
DSTKIM No
93-02678
CANDIS No
131611
Format(s):
Hardcopy;Originator's fiche received by DSIS

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