A displacement sensing method based on alternating current magnetic flux measurement

Zhang, Jikai; Wang, Rongbiao; Deng, Zhiyang; Kang, Yihua

doi:10.1088/1361-6501/aace30

Cited by 15 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with contact measurement methods, non-contact measurement methods are less likely to wear out the probe. There are many non-contact displacement sensors applicable to measure small displacements, such as capacitive displacement sensors, Hall displacement sensors, inductive displacement sensors, ECDSs, etc [4]. Capacitive displacement sensors are easy to manufacture and have small power consumption.…”

Section: Introductionmentioning

confidence: 99%

A magnetic head-based eddy current displacement sensing method

Chen,

Li,

Guo

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

Eddy current displacement sensors are popular for sensing changes in displacement in industrial fields with many advantages. The eddy current induced by a conventional coil is distributed over a large range and the energy is not concentrated. The size of the minimum measured surface is 1.5 to 3 times the diameter of the coil. A magnetic head-based eddy current displacement sensor is proposed in this paper. Theoretical analysis confirms that the coil generates a highly concentrated magnetic field at the magnetic core gap. The simulations based on the finite element method are performed. The simulation results demonstrate that the proposed method can induce the eddy current field which has a small distribution range and high degree of concentration of energy on the surface of the specimen. Finally, experiments are conducted for different sized ring-shaped surfaces. The high similarity between the experimental results indicates that the magnetic head-based eddy current displacement sensor can induce a highly focused eddy current field with a distribution range of 3 mm. The sensitivity of the sensor is 5 V mm−1 and the spatial resolution of the sensor is 3 mm.

show abstract

Section: Introductionmentioning

confidence: 99%

A magnetic head-based eddy current displacement sensing method

Chen,

Li,

Guo

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Recently, an alternating current magnetic flux measurement (AC-MFM) method for ferromagnetic materials was proposed [32]. The AC-MFM sensor has the advantages of low cost and compact structure compared to optical sensors.…”

Section: Introductionmentioning

confidence: 99%

A Displacement Sensing Method Based on Permanent Magnet and Magnetic Flux Measurement

Zhang

Shi

Huang

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

This paper proposes a displacement sensing method based on magnetic flux measurement. A bridge-structured magnetic circuit, formed by permanent magnets and two ferromagnetic cores, is designed and discussed. The analyses of the equivalent magnetic circuit and three-dimensional finite element simulations showed that the magnetic flux density changes linearly with the reciprocal of the sum of a constant and the displacement. A prototype sensor of the bridge structure is developed that consists of four permanent magnets as excitation, a Hall sensor as reception, and two ferromagnetic cores as the connection. Experiments have validated the feasibility of this method. The measured results show a good linearity between the sensor’s output and the reciprocal of the sum of a constant and the displacement, with a correlation coefficient greater than 0.9995 across different measurement ranges. Additionally, the measured results significantly indicate that the proposed sensor is compatible with different ferromagnetic materials with a worst-case error of less than 5%. The proposed sensor has the advantages of low cost and good linearity; however, the test object is limited to ferromagnetic materials.

show abstract

“…Micro-displacement measurement with high resolution and accuracy has numerous potential applications, such as automotive 1 , robotic system 2 , positioning 3 and medical applications 4 . Techniques based on capacitive 5 , optical 6 – 9 , as well as magnetic sensors 10 – 12 are widely used in non-contact displacement sensing. The capacitive type is susceptible to electromagnetic interference, and parasitic capacitance and fringe effects have been the major issues to improve the performance of the sensor 13 .…”

Section: Introductionmentioning

confidence: 99%

High-precision micro-displacement sensor based on tunnel magneto-resistance effect

Wang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

A high-precision micro-displacement sensor based on tunnel magneto-resistance effect is reported.We designed and simulated magnetic characteristics of the sensor, and employed chip-level Au-In bonding to implement low-temperature assembly of the TMR devices. We employed the subdivision interpolation technique to enhance the resolution by translating the sine-cosine outputs of a TMR sensor into an output that varies linearly with the displacement. Simultaneously, using the multi-bridge circuit method to suppress external magnetic and geomagnetic interference. Experimental result shows that the micro-displacement sensor has a resolution of 800 nm, accuracy of 0.14$$\%$$ % and a full-scale range of up to millimeter level. This work enables a high-performance displacement sensor, and provides a significant guide for the design of a micro-displacement sensor in practical applications.

show abstract

A displacement sensing method based on alternating current magnetic flux measurement

Cited by 15 publications

References 40 publications

A magnetic head-based eddy current displacement sensing method

A magnetic head-based eddy current displacement sensing method

A Displacement Sensing Method Based on Permanent Magnet and Magnetic Flux Measurement

High-precision micro-displacement sensor based on tunnel magneto-resistance effect

Contact Info

Product

Resources

About