초록 ▼

A magnetostrictive linear displacement transducer includes an elongated member of a material with a large magnetostriction coefficient. There is a coil and a pulse driver for magnetizing the member to cause a detectable magnetostrictive effect for short discrete periods of time. A magnet is movable

A magnetostrictive linear displacement transducer includes an elongated member of a material with a large magnetostriction coefficient. There is a coil and a pulse driver for magnetizing the member to cause a detectable magnetostrictive effect for short discrete periods of time. A magnet is movable along the path adjacent the member and is capable of magnetizing a localized portion of the member adjacent the magnet efficiently to cause an alteration in the magnetostrictive effect in the localized portion in concert with the pulse driver and the coil. There is a piezoelectric device at one end for detecting axial strain pulses propagated along the member caused by the magnetostrictive effect. There is a comparator for measuring time lags between initiation of each separate discrete period of time and detection of a corresponding strain pulses by the piezoelectric device and thereby a position of the magnet along the path.

대표청구항 ▼

[ What is claimed is:] [1.] A magnetostrictive linear displacement transducer, comprising:an elongated member of a material with a large magnetostriction coefficient, the member having a first end and a second end, the member having a folded-back portion adjacent the second end;an excitation coil ex

[ What is claimed is:] [1.] A magnetostrictive linear displacement transducer, comprising:an elongated member of a material with a large magnetostriction coefficient, the member having a first end and a second end, the member having a folded-back portion adjacent the second end;an excitation coil extending along the member;means for generating electrical signals, said means being connected to the coil and producing axial magnetic fields along the member;a magnet adjacent the member; andmeans for determining time delays between said signals and axial strain pulses travelling along the member caused by magnetostrictive changes in the member adjacent the magnet and accordingly the position of the magnet along the member, the means for determining including a piezoelectric device connected to the first end of the member.