Abstract: A Barkhausen noise sensing device for inspecting an object made of ferromagnetic material, having a transceiver coil configured for generating an excitation magnetic field within the object and detecting a Barkhausen noise emitted by the object and a powering unit connected to the transceiver coil and connectable to a power source. The powering unit is configured for providing the transceiver coil with an Alternating Current (AC) electrical signal. Also provided is a detection unit connected to the transceiver coil for detecting an induced magnetic field emitted by the object and being indicative of the Barkhausen noise. The detection unit is configured for outputting a detection signal indicative of the detected induced magnetic field.

Abstract: The invention relates to a goniometer and a method for measuring stresses and characterizing microstructure of particles. The goniometer comprises a base (1), and a measurement head (12) including both an X-ray tube and a detector arc (11) movably adapted to the base (1) by a robot capable for three-dimensional movement. In accordance with the invention the robot has means for creating arc-formed movement of the measurement head (12) during the measurement with rotating (5, 7, 15) and tilting (3, 16, 9) joints.

Abstract: The invention relates to a goniometer (1) and a method for measuring stresses and characterizing microstructure of particles. The goniometer comprises frame (4), a measurement head (7, 8, 9, 10) movably adapted to the frame (4) by a first linear movement unit (5), second linear movement unit (6) and a tilting movement unit (16), for performing measurement at a measurement point. According to the invention the axis of rotation (12) of the tilting movement unit (16) does not coincide with the measurement point, and the device has means (17) for creating arc-formed movement of the measurement head (7, 8, 9, 10) during the measurement with said movement units (5, 6, 16).

Abstract: This publication discloses a method and arrangement for determining the hardening depth of steel or other ferromagnetic substances without breaking the object being measured. According to the invention, a varying magnetic field, which causes magnetic Barkhausen noise (MBN), is created in the measurement object with the aid of a magnetization coil 13. The varying magnetic field is regulated in such a way that the maximum force of the magnetic field does not exceed the coercitive force of the unhardened part of the measurement object. The MBN caused is measured with the aid of an MBN sensor. The measured signal is filtered and Fourier transformed. The signal in the frequency range is integrated over a suitable frequency band, in order to determine the value depicting the energy of the MBN. This value correlates with the hardening depth and on the basis of this value it is thus possible to determine the hardening depth.