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Barkhausen Noise Analysis (BNA) method, also referred to as the Magnetoelastic or the Micromagnetic method is based on a concept of inductive measurement of a noise-like signal, generated when magnetic field is applied to a ferromagnetic sample.
Many common surface treatments such as grinding, shot peening, carburizing and induction hardening, involve some modification of both stress and microstructure and can be readily detected using the method. Various dynamic processes such as creep and fatigue similarly involve changes in stress and microstructure and can also be monitored with Barkhausen noise.

BARKHAUSEN NOISE ANALYSIS

The XSTRESS measurement technique allows fast and highly accurate measurement of residual stresses in all crystalline materials such as steel, aluminum, titanium etc. as well as analysis of residual austenite content in hardened steels. Today, the fourth generation of X-ray stress analyzers, the XSTRESS 3000, appeals equally to demanding academics as to factory shop floor users. MS Windows based software can be operated by a production worker while expert level menus allow researchers unrestricted access to all measurement parameters.

XSTRESS 3000 X-RAY DIFFRACTION

PRISM (Precision Real-time Instrument for Surface Measurement) is a measurement tool that provides full field-of-view surface shape change measurement around a drilled hole. Based on the principle of electron speckle pattern interferometry, the system can provide quantitative measurement down to approximately 30 nanometers.
PRISM dramatically improves the ability to make quick and accurate residual stress measurements and significantly increases the speed of data acquisition over the traditional strain gauge hole-drilling technique of measuring residual stress. With a PRISM system, users can perform the entire operation and have stress results in less than 5 minutes.

PRISM ESPI STRESS MEASUREMENT

Stresstech Oy - Vaajakoski, Finland

The Stresstech Group comprises of Stresstech Oy , establised  in Finland in 1984, American Stress Technologies inc. (AST established in 1983) in the USA  and Stresstech GmbH (established in 1999) in Germany. Stresstech has served the manufacturing, engineering and research industries all over the World, providing solutions and high-tech instruments for the non-destructive testing of components. Many leading edge companies in the automotive and aerospace sectors have already chosen the Stresstech Group as their preferred partner in quality control systems.
Stresstech’s main products are Barkhausen noise analyzers and sensors, X-ray diffraction equipment and the PRISM residual stress testing instrument, based on hole-drilling  and ESPI technology.

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