Classification of steel balls by resonant eddy current sensor

2021 ◽  
Author(s):  
Duy-Vinh Dao ◽  
Jen-Tzong Jeng ◽  
Van-Dong Doan ◽  
Chinh-Hieu Dinh ◽  
Thi-Trang Pham ◽  
...  
Keyword(s):  
Eddy Current ◽  
Steel Ball ◽  
Electromagnetic Properties ◽  
Current Sensor ◽  
Pickup Coil ◽  
Current Signal ◽  
Subtle Difference ◽  
Eddy Current Sensor ◽  
Steel Balls

Abstract The quality and work-life of ball bearings depending on the material properties of the steel ball, hence it is necessary to carefully classify their properties for bearings and related applications. Classification of steel balls based on the subtle difference in their electromagnetic properties is presented in this paper. The conductivity and magnetic susceptibility for the steel balls of the same kind are measured to investigate the correlation with eddy-current signals. The developed eddy-current sensor works at the resonant frequency of 117 kHz with an optimal readout resistance of 15 kΩ, which helps to boost the signal level without a high-gain preamplifier. To detect the eddy-current signal, the steel ball under test moves through the pickup coil, and the recorded data are used to build the voltage probability map for the classification of the steel ball properties. Experimental results show that the steel balls with and without the hardening process can be identified by the change in the amplitude and phase of the eddy current signal, which is consistent with the observed change in the electromagnetic properties of steel balls. The built system can be applied to the related industries to check the quality of steel balls before use.

Preliminary Experiment of CFRP Displacement Direct Measurement with Eddy Current Sensor

2012 ◽  
Vol 241-244 ◽  
pp. 3-8
Author(s):  
Lei Jiang ◽  
Xiao Zhang Zhang ◽  
Yu Jie Bai ◽  
Chang Liang Tang
Keyword(s):  
Eddy Current ◽  
Electromagnetic Properties ◽  
Current Sensor ◽  
Actuation Frequency ◽  
Experimental Platform ◽  
Eddy Current Sensor ◽  
Promising Tool ◽  
High Anisotropy ◽  
Aluminum Ingot ◽  
Great Heterogeneity

Displacement and vibration can always be found during the applications of CFRP ( carbon fibe reforced polymer). So it’s quite meaningful to measure the displacement of CFRP directly. Eddy current sensor is a promising tool for this measurement. CFRP presents great heterogeneity and high anisotropy in electromagnetic properties. At the same time, it has been proved that CFRP has quite weak conductivity. All of these means great challenge to the use of eddy current sensor, as the sensitivity would be much lower compared with traditional material such as aluminum. Many experiments have been carried out on the experimental platform self-developed in laboratory. A simplified eddy current sensor with adjustable resonant circuits was designed. Two different kinds of CFRP were used as specimens. For purposes of comparison, an aluminum ingot sample was also tested. A number of experimental data and results have been achieved. It is shown that the sensitivity will be highly improved by adjusting the divider resistance and the actuation frequency.

Research and Fabrication on Eddy Current Sensor Based on UV-LIGA

2007 ◽  
Author(s):  
Xiao-Hu Zheng
Keyword(s):  
Eddy Current ◽  
Output Voltage ◽  
Magnetic Core ◽  
Current Sensor ◽  
Pickup Coil ◽  
Eddy Current Sensor ◽  
Liga Technology ◽  
Planar Coil ◽  
On Chip ◽  
Sine Signal

An analytical model of an eddy current sensor designed for noncontact distance measurement was presented. The device consists of two planar coil (driver coil and pickup coil) stacked on the magnetic core. The planar coil fabricated by UV-LIGA technology with SU8 photoresist was illustrated, and the permalloy magnetic core electroforming process was presented also. Tested with 10–50KHz sine signal, the output voltage on the sensing coil rearched 30mv with an stainless target placed at a distance of 10μm, and the experimental showed a linear relation between the distance and output voltage within 50μm distance. The whole size of the device was: Φ5mm × 1.5 mm. The results demonstrated that the device could nondestructive evaluate the distance and be easily integrated on chip.

scholarly journals Application of a Saddle-Type Eddy Current Sensor in Steel Ball Surface-Defect Inspection

Sensors ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2814 ◽  
Author(s):  
Huayu Zhang ◽  
Mingming Zhong ◽  
Fengqin Xie ◽  
Maoyong Cao
Keyword(s):  
Eddy Current ◽  
Surface Defect ◽  
Steel Ball ◽  
Current Sensor ◽  
Defect Inspection ◽  
Eddy Current Sensor ◽  
Ball Surface ◽  
Saddle Type

Development and Fabrication of the Micro Eddy Current Sensor by Using UV-LIGA Process

2010 ◽  
Vol 139-141 ◽  
pp. 2283-2286
Author(s):  
Xiao Hu Zheng ◽  
Feng Gu
Keyword(s):  
Eddy Current ◽  
Output Voltage ◽  
Magnetic Core ◽  
Current Sensor ◽  
Pickup Coil ◽  
Eddy Current Sensor ◽  
Liga Technology ◽  
Planar Coil ◽  
On Chip ◽  
Sine Signal

An analytical model of an eddy current sensor designed for noncontact distance measurement is presented. The device consists of two planar coil (driver coil and pickup coil) stacked on the magnetic core. The planar coil fabricated by UV-LIGA technology with SU-8 photoresist is illustrated, and the permalloy magnetic core electroforming process is presented also. Tested with 10-50 KHz sine signal, the output voltage of the sensing coil reached 30mv with a Ni target placed at a distance of 20μm. And the experimental showed a linear relation between the distance and output voltage within 60μm distance. The amplitude trend increases with the increasing of the frequency and amplitude of excited signal, which is according with the theory analytics. The whole size of the device is: Φ5mm×1.5mm. The results demonstrated that the device could nondestructive evaluate the distance and be easily integrated on chip, and the UV-LIGA Process could be used as a new method to fabricate the micro eddy current sensor massly.

Inspection of Surface Rolled Sintered Gears using Eddy-Current Sensor

2013 ◽  
Vol 133 (5) ◽  
pp. 300-306
Author(s):  
Tsutomu Mizuno ◽  
Yuichi Asato ◽  
Sho Goto ◽  
Takashi Watanabe ◽  
Teruie Takemasu ◽  
...  
Keyword(s):  
Eddy Current ◽  
Current Sensor ◽  
Eddy Current Sensor

scholarly journals Eddy Current Sensor System for Tilting Independent In-Process Measurement of Magnetic Anisotropy

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2652
Author(s):  
Frank Wendler ◽  
Rohan Munjal ◽  
Muhammad Waqas ◽  
Robert Laue ◽  
Sebastian Härtel ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Eddy Current ◽  
Digital Signal ◽  
Production Equipment ◽  
Sensor System ◽  
Current Sensor ◽  
Cold Forming ◽  
Eddy Current Sensor ◽  
Two Samples ◽  
Internal Mechanical Stress

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.

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