Application Pages

Design Optimization of an NDT Sensor Probe

Design of the probe and its suitability for detecting particular types of defects: starting from a model based on the WFNDEC Eddy Current Benchmark Problem 2, OptiNet was used to determine the optimal coil geometry and frequency at which the inspection should be performed.

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Detecting a Crack - A Problem in N.D.T. (T.E.A.M. Problem 8)

In this example, MagNet simulates an eddy current NDT problem: detecing the crack in a stainless steel block with a solenoid probe moving across its surface. The objective is to detect a crack by measuring the difference of magnetic fluxes through two solenoids.

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Detecting Flaws and Nondestructive Evaluation (T.E.A.M. Problem 15)

This example demonstrates how MagNet can be used for non-destructive testing/evaluation and sensor problems. A circular coil moves along an aluminum plate that contains a slot. The goal of is to detect the slot by calculating the resistance and inductance of the driving coil at various positions.

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Eddy Current NDT and Deep Flaws (T.E.A.M. Problem 27)

A coil is stationary over a sheet of aluminum that contains a screw hole. Inside of the screw hole, a flaw is to be detected by two Hall effect sensors. The sensors are used to measure the horizontal differential flux density .

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Position and speed of metal components measured with variable reluctance sensor

Variable reluctance sensors are used to measure position and speed of moving metal components. This sensor consists of a permanent magnet, a ferromagnetic pole piece, a pickup coil, and a rotating toothed wheel.

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Using the Mesh Layers feature on Nondestructive Testing Problems

For NDT problems, there is a need to model the magnetic fields and eddy currents accurately in the regions under inspection. The fields decay rather quickly to zero in the surrounding regions. Further, the fields tend to change very quickly (exponential decay) with increasing depth into the test specimen (skin depth effects), and not nearly as rapidly in the two perpendicular directions. The Mesh Layers feature allows the construction of a mesh that is optimized for these types of problems.

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WFNDEC Benchmark Problem 2 - Eddy Current Inspection of Inconel Pipe

WFNDEC's1 Eddy Current Benchmark Problem 2 involves the inspection of an Inconel pipe using an internal pancake coil situated with its axis perpendicular to the axis of the pipe. Small defects of various depths in the external wall of the pipe are scanned in the axial and circumferential directions. Defects are detected as a change in the impedance of the coil.

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