Barkhausen noise analysis in practice: Case depth

The detection of the case depth with Barkhausen noise measurement is based on the hardness difference of the surface (case) and the interior of the material.

Case hardening is used to create a hard and more wear resistant outer layer to a component but keeping the inner regions soft and ductile. To verify the depth of this case is of importance to part manufactures. A NDT method would be a great way to do this so that the part would not need to be destructed.

Measuring case depth with Barkhausen noise is not straightforward but it has shown promising results in some studies

Barkhausen noise signal and case depth correlation requires generating a sample set with known varying case depths. Case depths are verified via traditional methods (sectioning and metallography) to establish the relationship between Barkhausen noise signal and case depth.

We provide Barkhausen noise inspection systems for a wide range of steel components in following automation levels:


Inline/Robot Systems

RoboScan is an automated grinding burn and heat treatment defect detection system that can be integrated into production line.

GearScan 500 and user

Automated systems

Automated systems for quality inspection are tailored for offline use. Easy to use software makes inspections intuitive and systems can adapt to various component types.

CrankScan 200 with user

Semi-automated systems

Semi-automated and manual Barkhausen noise analysis systems are suitable for low volume measurements. The most simple Barkhausen noise measurements can be performed handheld with only a sensor and analyzer.

Barkhausen noise analysis with Rollscan 350 and general purpose sensor.

Manual systems

Customized manual Barkhausen noise stands are grinding burn and heat treatment defect detection systems for low-volume applications.