Proposal of Thickness Measurement Method of Steel Plate With High Liftoff Using Pulsed Magnetic Field

The thickness measurement and monitoring of all kinds of equipment and parts, especially making general investigations on the thickness of boiler, pressure vessel and pipelines regularly, monitoring their thinning after corrosion in the process of using, and ensuring the safety production have attracted more and more attention among the companies. Based on the thickness measurement principle of pulse reflection type ultrasonic, the measurement method of the steel plate thickness was studied, and AVR Atmega16 single chip microcomputer as control chip was used. The analysis and comparison of ultrasonic transmitting circuit, receiving circuit, amplifying circuit, LCD display circuit, keyboard circuit, communication circuit, counter 232 AVR Atmega16 line were also included. The performance of this system regarding the steel plate as sample was tested, and then the data and the causes of measurement error were presented.

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Residual thickness measurement method of corroded steel plate using ultrasonic SH array transducer

2017 IEEE International Ultrasonics Symposium (IUS) ◽

10.1109/ultsym.2017.8091899 ◽

2017 ◽

Author(s):

Tomonori Kimura ◽

Akira Hosoya ◽

Mitsuhiro Koike ◽

Minoru Takahashi ◽

Jun Murakoshi

Keyword(s):

Measurement Method ◽

Steel Plate ◽

Thickness Measurement ◽

Array Transducer ◽

Residual Thickness

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Calculation of Lorentz force in planar EMAT for thickness measurement of steel plate

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-05-2016-0180 ◽

2017 ◽

Vol 36 (4) ◽

pp. 1257-1269 ◽

Cited By ~ 1

Author(s):

Jun Tu ◽

Tao Chen ◽

Zhi Xiong ◽

Xiaochun Song ◽

Songling Huang

Keyword(s):

Magnetic Field ◽

Lorentz Force ◽

Steel Plate ◽

Physical Phenomenon ◽

Element Model ◽

Thickness Measurement ◽

Three Dimension ◽

Electromagnetic Acoustic Transducer ◽

Content Type ◽

Set Up

Purpose The aim of this paper is to better understand the generation and transmission mechanism of the electromagnetic acoustic transducer (EMAT). Design/methodology/approach A semi-analytical method was used to calculate the Lorentz force. Both the hypothetical magnetic field mirror method and the diffusion equation were adopted to solve the eddy current distribution by variables separation method in time domain. A three-dimension magnetostatic finite element model was used to calculate the static magnetic field and the relative permeability. And an experimental platform with a piezoelectric probe to generate and an EMAT to receive, the ultrasonic wave was set up to verify the distribution of the Lorentz force. Findings The Lorentz force at different time and in different positions of the steel plate can be easily calculated. The experimental results show a good agreement with the analytical results. Originality/value The accurate prediction of the Lorentz force provides an insight into the physical phenomenon of EMAT and a powerful tool to design optimum EMAT.

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