Point Probes: a new generation of magnetic sensors for the measurement of local magnetic fields

Amiri, Meisam Sheikh; Szielasko, Klaus; Altpeter, I.; Boller, Christian; Fischer, D.; Hahn, Jin Woo

doi:10.1088/1757-899x/31/1/012021

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…• Point probe: A needle-shaped ferromagnetic core equipped with a primary (excitation) and a secondary (detection) coil is applied for characterizing local permeability and magnetic field [34]. The sample properties close to the needle tip strongly affect the secondary coil voltage waveform under application of sinusoidal voltage to the primary coil.…”

Section: Imaging Of Local Residual Stress Distribution Using Barkhausmentioning

confidence: 99%

Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques

Rabung¹,

Amiri²,

Becker³

et al. 2020

New Challenges in Residual Stress Measurements and Evaluation

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Material processing and service loads in different lifecycle stages of a productranging from semi-finished goods to operating structures-lead to an unfavorable superposition of residual stresses, especially of micro-and macro-residual stresses. Whereas near-surface compressive stress is often desired as it prolongs the useful service life, undesired, steep stress gradients and tensile stress at the surface promote the occurrence of cracks and wear during operation, ultimately leading to expensive and possibly dangerous premature component failure. Reliable management of the residual stress condition significantly contributes to the assessment and optimization of a part's or component's lifetime. Therefore, the nondestructive evaluation of residual stress in objects of different scales reaching from laboratory samples over semi-finished products up to operating components and structures has gained significant importance in the latest decades. Micromagnetic and ultrasonic methods are based on the interaction of an external magnetic field or an ultrasonic wave, respectively, with the material's microstructure and residual stress fields on different scales and in different depths from the material surface. The present contribution provides an overview regarding the local and volumetric measurement, characterization and evaluation of macro-and micro-residual stress by means of micromagnetic and ultrasonic techniques.

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Section: Imaging Of Local Residual Stress Distribution Using Barkhausmentioning

confidence: 99%

Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques

Rabung¹,

Amiri²,

Becker³

et al. 2020

New Challenges in Residual Stress Measurements and Evaluation

View full text Add to dashboard Cite

show abstract

“…The needle can effectively measure the surface hardness of the material. Amiri used a magnetic core with a tapered head to design a point probe, and provided a hardness measurement method based on the strength of the residual magnetic field [18]. Characterization.…”

Section: Introductionmentioning

confidence: 99%

Design of advanced micro-magnetic sensors for various applications

Wang

Liu

et al. 2022

J. Phys.: Conf. Ser.

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The state of the microstructures determines both the mechanical properties (hardness, yield strength, elongation, etc.) and micro-magnetic properties (magnetic Barkhausen noise (MBN), incremental permeability (IP), etc.). The non-destructive nature of the micro-magnetic testing technology facilitate it be a valuable tool for quality control in the manufacturing of ferromagnetic components. In the implementation of micro-magnetic testing, the functions and the geometry of the sensors need be customized for specific target properties and components. In this paper, four types of advanced or multifunctional sensors are presented and applied for micro-magnetic testing. First, a multifunctional sensor is developed for flat surface. Unique intermittent magnetizing method using superimposed magnetic fields of high and low frequencies enable the sensor to measure the magnetic Barkhausen noise, incremental permeability, eddy currents, tangential magnetic field and main flux. Second, to conduct magnetic Barkhausen noise testing at the inner corner of V-shape bending plate, a miniaturized sensor with U-shape roller magnetizer is designed to perfect contact with the corner region. Third, read head of a magnetic tape player is revised to act as high-lateral-resolution (up to 500μm) sensor for magnetic Barkhausen noise measurement in ferromagnetic film. Fourth, a slender probe is developed and embedded into an anti-bulking fixture that is clamped onto the flat specimen. With the slender probe together with the special fixture, the dependency of the magnetic Barkhausen noise on the compressive and tensile stress is first experimentally observed in a single flat specimen under continuous load.

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Point Probes: a new generation of magnetic sensors for the measurement of local magnetic fields

Cited by 2 publications

References 1 publication

Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques

Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques

Design of advanced micro-magnetic sensors for various applications

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