G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/82 (2006.01) G01B 7/34 (2006.01) G01N 27/90 (2006.01) G01N 33/38 (2006.01)
Patent
CA 2361813
Discloses apparatus and methods of operation of the apparatus for performing magnetic testing of pre-stressing elements in a pre-stressed concrete cylinder, such as a pipe or water reservoir. The apparatus includes magnetic flux production means disposed proximal to a surface of the cylinder under test and detector means disposed proximal to a surface of the cylinder in a plane in common with the magnetic flux production means that is orthogonal to an axis of the cylinder. The apparatus operates over a range of low frequency periodic signals, for example, between 20 and 300 hertz. Output of the inspection apparatus includes analysis providing a multi- frequency plot showing the results of testing a cylinder using two or more frequencies. In accordance with another method of analysis, a single frequency is plotted along with a transformation plot, the transformation plot produced by transforming either the in-phase or quadrature components of the received signal in relation to the periodic driving signal by an angle alpha.
Mcintyre John
Mitchell Kevin
Paulson Peter O.
Blake Cassels & Graydon Llp
Pure Technologies Ltd.
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