Electromagnetic analysis of concrete tensioning strands

Details Electromagnetic analysis of concrete tensioning strands Electromagnetic analysis of concrete tensioning strands

G - Physics

01

N

G01N 27/82 (2006.01) G01N 27/90 (2006.01) G01N 33/38 (2006.01)

Patent

CA 2477880

(57) Abstract: Discloses methods to perform magnetic testing of tensioning elements in a pre-stressed concrete cylinder, such as a pipe or water reservoir and testing apparatus. The apparatus includes magnetic flux production means 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 signals, for example, between 20 and 300 hertz or a pulse. Output of the inspection apparatus includes a signal and distance plot showing the results of testing a cylinder at one or more frequencies. In accordance with another method of analysis, a characteristic of the phase of the output over distance is plotted, including the phase or representations of the in-phase or quadrature components of the received signal in relation to the driving signal.

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