Magnetostrictive delay lines: engineering theory and sensing applications

Abstract

A review of the engineering theory and the sensing element applications of the magnetostrictive delay line (MDL) technique is presented. The state of the art of magnetic materials and effects used in sensor design is overviewed and the operation of MDLs and their basic engineering properties are discussed. The resulting position, stress and field sensors based on this technique as well as their most significant applications are demonstrated. Finally, the industrialization process and the integration of the sensors with electronic circuitry as well as their evaluation with respect to the state of the art are discussed.

Magnetotransport studies in ribbons

“…magnetic anisotropy, saturation magnetostriction, coercivity, etc. Variations of electrical resistivity with applied magnetic field are of special interest, yielding important physical information about the magnetization processes as well as providing a basis for practical exploitation of these systems [1,2]. The aim of the current paper is to present preliminary results of magnetotransport studies in ðFe x Co y Þ 73 Nb 7 Si 5 B 15 system with different Fe/Co ratio in as-quenched state and after specific thermomechanical treatment.…”

Novel application of the magnetostrictive delay lines for real-time monitoring of the ceramic components

“…Generator coil (2) generates magnetostrictive impulses in the amorphous alloy ribbon (1). For experiments, the ribbon made of Fe 78 Si 13 B 9 amorphous alloy in as-quenched state was utilized.…”

“…Magnetostrictive delay lines are based on detection of the magnetostrictive impulse, moving in magnetostrictive material with the speed of sound [1,2]. Such magnetostrictive impulse may be generated during local, rapid magnetisation process.…”

Sensors based on bulk soft magnetic materials: Advances and challenges

“…The length of these sensors is limited by attenuation to about 4-6 m. Resolution can be as low as 0.4 mm and uncorrected non-linearity 0.02% FS. Magnetostrictive delay lines allow measuring also other physical variables at multiple points [31]. …”