Strain measuring device employing magnetostriction and having a

Details Strain measuring device employing magnetostriction and having a Strain measuring device employing magnetostriction and having a

1989-04-12

1991-06-11

Strecker, Gerard R.

Measuring and testing

Dynamometers

Responsive to torque

73779, 324209, 505701, 505842, 505872, G01L 310, G01B 724, G01R 3318, H01B 1206

Patent

active

050222759

ABSTRACT:
In a strain measuring device employing a magnetic permeability detector means to detect an amount of strain in a passive member as changes of magnetic permeability in a magnetostrictive layer, a magnetic shielding layer is formed on the surface of the passive member, and the magnetostrictive layer is formed thereon so as to lessen the adverse effects of the passive member caused by the magnetic characteristics of the passive member in strain measurement, that is, to reduce measurement errors. Alternatively, a magnetostrictive layer is formed on the surface of the passive member, or a magnetic shielding layer is partially forrmed on the surface of the passive member of soft magnetic material with high permeability, so as to lessen the influence of the passive member caused by thermal stresses of the passive member in strain measurement, that is, to reduce measurement errors. Further, there is provided a strain measuring device which facilitates formation of the magnetostrictive layer.

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Sasada et al., "Torque Transducers With Stress-Sensitive Amorphous Ribbons of Chevron Pattern," IEEE Transactions on Magnetics, vol. Mag-20, No. 5, Sep. 1984.

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