Method and apparatus for measuring strain within a ferromagnetic

Details Method and apparatus for measuring strain within a ferromagnetic Method and apparatus for measuring strain within a ferromagnetic

1990-06-04

1992-08-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Stress in material measurement

73779, 7386269, 324223, G01B 724, G01L 112, G01R 3314, G01R 3318

Patent

active

051422271

ABSTRACT:
Strain within a substrate is measured by attaching thereto a magnetic circuit comprising a magnetostrictive, soft ferromagnetic element, and sensing a change in the coercive field of the element caused by strain therewith.

REFERENCES:
patent: 4449095 (1984-05-01), Steingroever et al.
patent: 4623841 (1986-11-01), Stinson et al.
patent: 4931729 (1990-06-01), Pratt
patent: 4931730 (1990-06-01), Olsen et al.
Mohri et al.; Sensitive Force Transducers Using a Single Amorphous Core Multivibrator Bridge; IEEE Trans. on Magnetics, vol. MAG-15, No. 6, Nov. 1979, pp. 1806-1808.
Goto et al., J. Appl. Phys., 52, 1914-16 (1981), "Effect of tension on coercive force in amorphous (Fe.sub.1-x Co).sub.77 Si.sub.10 B.sub.13 ribbons".
Ferro et al., IEEE Trans. Magn., MAG-7, 230-32 (1971), "On the Effect of Strain on the Coercive Force of Some Fe-Ni Alloys . . . ".

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