Barkhausen Noise NDI for Heat-Treatment Defects and Case-Depth Analysis

摘要

Barkhausen Noise Analysis (BNA) is a nondestructive technique based on the inductive measurement of a noise-like signal generated in ferromagnetic material when introduced to an external magnetic field. While the physical phenomenon of magnetic Barkhausen Noise was first observed and explained in 1919, industrial application of it as a measurement technique was uncommon before the 1980s. Today, BNA is a trusted nondestructive method for stress analysis, material characterization and the detection of heat-treatment and other thermally induced material defects.