Abstract
In this paper, an open magnetic circuit magnetostrictive guided wave sensor that allows free regulation of the static working point is proposed for ferromagnetic material waveguide wires applied to non-destructive testing of wire bars, guided wave mechanics study, magnetostrictive linear displacement sensors and other fields. The sensor was made up of an iron-gallium alloy wire, a ring-shaped permanent magnet and a concentric coil, which was used to excited a longitudinal mode guided wave on the iron-gallium alloy wire. The structural parameters of the permanent magnet were optimized, the axial relative distance between the permanent magnet and the coil was studied and the superposition of and matching between the dynamic magnetic field and the static bias magnetic field were adjusted, allowing identifying the optimal magnetization point, so that the magnetic acoustic transduction efficiency was optimized. The sensor was analyzed, by means of finite element simulation, to produce the best system combination, which improved the sensitivity of the measurement. The improvement has been experimentally verified.
Highlights
A magnetostrictive guided wave sensor is an electromagnetic coupling-based device that excites and receives ultrasonic waves in ferromagnetic materials.1 In point of non-destructive testing of wire materials, such a sensor by providing information on wire quality helps to improve the production process and product quality, offering great significance to the engineering structure and machinery manufacturing fields.2 Putting magnetostrictive ultrasonic guided waves to use in wire flaw detection obviates the need for couplant and for contacting the tested workpiece while allowing superficial and internal detection of the wire, thereby improving the detection efficiency and simplifying the detection process
Liu Zenghua et al compared closed double magnetic circuits and three magnetic circuits bias magnetic field, both provided by a permanent magnet, in magnetostrictive longitudinal guided wave flaw detection of steel strand, suggesting that the magnetic field strength provided by three magnetic circuits is stronger and more uniform
The magnetization uniformity was improved by optimizing the ring width and thickness of the ring permanent magnet, and the open magnetic circuit was used to simplify the design of the sensor
Summary
A magnetostrictive guided wave sensor is an electromagnetic coupling-based device that excites and receives ultrasonic waves in ferromagnetic materials. In point of non-destructive testing of wire materials, such a sensor by providing information on wire quality helps to improve the production process and product quality, offering great significance to the engineering structure and machinery manufacturing fields. Putting magnetostrictive ultrasonic guided waves to use in wire flaw detection obviates the need for couplant and for contacting the tested workpiece while allowing superficial and internal detection of the wire, thereby improving the detection efficiency and simplifying the detection process. In connection with guided wave mechanics, Xu Jiang et al used a magnetized DC coil to provide a uniform bias magnetic field while studying the effect of a tensile force on longitudinal guided waves the magnetostrictive sensor generates and receives on a steel wire.. Fernando Seco et al proposed a magnetostrictive linear displacement sensor that contains a permanent magnet to provide a closed four-circuit bias magnetic field for longitudinal mode guided wave excitation.. This study aimed to design an open magnetic circuit magnetostrictive guided wave sensor that allows the bias magnetic field strength to be regulated more freely and that is simpler but more accurate. The permanent magnet creates in the air and in the ferromagnetic wire a bias magnetic field of an open magnetic circuit such that we may do without a cumbersome design, reduce the device volume, and save the manufacturing cost, producing better practical effects
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