Strain gauge

Details Strain gauge Strain gauge

1987-07-10

1988-11-08

Levy, Stewart J.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

338 32H, G01L 100, H01L 4306

Patent

active

047827050

ABSTRACT:
A strain gauge comprised of a premagnetized ferromagnetic film wherein any change in length of the film is converted into a planar Hall voltage by employing the property of magnetostriction and the planar Hall effect. Alternately, a change in the length of the film can also be measured as a change in electric conductivity by employing the properties of magnetostriction and magnetoresistance. The strain gauge is deposited on a substrate by thin-film techniques and has a very high sensitivity.

REFERENCES:
patent: 3399056 (1968-08-01), Doi
patent: 3807223 (1974-04-01), Juillerat et al.
patent: 3838595 (1974-10-01), Godefroy
patent: 3858138 (1974-12-01), Gittleman et al.
patent: 4373397 (1983-02-01), Keller
patent: 4374665 (1983-02-01), Koon
patent: 4434671 (1984-03-01), Yamashita et al.
patent: 4561314 (1985-12-01), Alley et al.
patent: 4649755 (1987-03-01), Volz
J. Appl. Phys. 52(3), Mar. 1981, "Applicability of the Planar Hall Effect", pp. 2468-2470 (Author: Jan H. Fluitman).
Phys. Stat. Sol., 26, 585 (1968), "Planar Hall Effect in Ferromagnetic Films", pp. 565-569 (Author: Vu Dinh Ky).
Ort, The Latest In-Foil Strain Gauges Versus Thin Film Strain Gauges, Conference, 1978.
Tolman, "Monitoring the Magnetostriction of Thin Films During Vacuum Deposition", Review of Scientific Instruments, vol. 35, No. 6, 1964.

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