Abstract
Modern production equipment is based on the results of quality control as well as process parameters. The magnetic anisotropy of materials is closely connected to internal mechanical stress by the Villari effect, and also to hardening effects due to plastic deformations, and could therefore provide an interesting basis for process control. Nevertheless, the analysis of anisotropic properties is extremely sensitive to sensor and workpiece misalignments, such as tilting. In this work, a novel eddy current sensor system is introduced, performing a non-contact measurement of the magnetic anisotropy of a workpiece and realizing a separation and correction of tilting effects. The measurement principle is demonstrated with the example of two samples with different magnetic anisotropy values induced by cold forming. Both samples are analyzed under different tilt angles between the sensor axis and the surface of the workpiece. In this work, digital signal processing is demonstrated on the acquired raw data in order to differentiate the effects of tilt and of anisotropy, with the use of preliminary results as an example of two prepared samples.
Highlights
The fourth industrial revolution has driven changes in several sectors by the introduction of novel sensor and communication technologies [1,2]
We propose a novel, non-contact, non-destructive, multichannel eddy current sensor system with several magnetic sensors around a central sensor coil, allowing for the quantitative analysis of anisotropy as well as compensating for the tilting effect between the metal sample and sensor system that arises from the production process of a material
A novel method is proposed for the independent measurement of the magnetic anisotropy of metallic materials on tilting angles
Summary
The fourth industrial revolution has driven changes in several sectors by the introduction of novel sensor and communication technologies [1,2]. In the field of carbon fiber materials, eddy current measuring systems consisting of transmitter and receiver coils are used for laboratory investigations that evaluate the impedance of the directional coupled coil pair [12,13] These systems require the re-orientation between the specimen and the sensor to detect different directions and do not allow for the correction of incorrect positioning. These systems assume material homogeneity, and require significant improvements in the detection and quantification of anisotropy, since the directiondependent material properties require a greater variety of sensor elements To overcome this problem, we propose a novel, non-contact, non-destructive, multichannel eddy current sensor system with several magnetic sensors around a central sensor coil, allowing for the quantitative analysis of anisotropy as well as compensating for the tilting effect between the metal sample and sensor system that arises from the production process of a material. The concept of coupling inductive sensors is extended by the use of more pick-up sensor elements, in a specific pattern, so that the raw data can be used to differentiate the effects of anisotropy and those of tilting
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