What material is the sensitive element (i.e. waveguide wire) of magnetostrictive displacement sensor commonly used in the market now?

Magnetostrictive wire, also known as waveguide wire, has remarkable Widman effect. Magnetostrictive wire liquid level position/displacement sensor has the advantages of non-contact, high sensitivity, large measuring range, anti-interference and adaptability to harsh environment. It has been widely used in the liquid level measurement of oil depots and liquid chemical raw materials, and has a wide application prospect in aerospace, nuclear industry, precision machine tools, automobile industry, water treatment and other fields.

● The sensor works at low power and requires a large magnetostrictive coefficient under a small magnetic field.

● Eddy current loss and hysteresis loss should be minimum, and the electromechanical coupling coefficient should be high.

● Magnetostrictive waveguide wire should be 0.5- 1.0mm, with good mechanical properties and easy processing.

Good temperature characteristics. In particular, the temperature coefficient of torsional wave propagation velocity must be as small as possible.

● It can measure the displacement change in a large range in high temperature area, and has high Curie temperature and mechanical quality factor.

The price of magnetostrictive materials should be appropriate, which is conducive to the popularization and use of sensors. Fe-Ni-based alloy is a competitive waveguide material for developing large-scale magnetostrictive displacement sensor waveguide wire in wide temperature range.