Apparatus for electromagnetically testing the walls of pipelines

Details Apparatus for electromagnetically testing the walls of pipelines Apparatus for electromagnetically testing the walls of pipelines

1986-03-14

1988-09-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

73601, 73623, 73643, 324226, 324227, 324232, 324242, G01N 2783, G01N 2900, G01R 3312, G01B 1702

Patent

active

047695986

ABSTRACT:
Apparatus for electromagnetically testing pipeline walls of steel or the like ferromagnetic material which is equipped, for example with a magnetizing coil for leakage-flux measurements, can be extended for ultrasonic measurement which is inductively excited and inductively measured with regard to the travel time as far as a reflecting surface and back, in the disposed in one or more of the pole regions there is a high-frequency current coil for the transmission and/or reception of steep-edged waves which are inductively coupled at the wall of the pipeline. The associated method starts from a stationary magnetic field in which high-frequency current pulses are produced in order to initiate vibrations in the pipe wall through induced currents. The travel time of these vibrations to a reflecting point and back can be measured in order to obtain an indication regarding the intact thickness of the pipe wall.

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The development and application of the intelligent pig; Pipes & Pipelines International, Oct. 1981, pp. 22,23,26,27.

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