Strain gauge

Details Strain gauge Strain gauge

1988-07-22

1989-12-05

Raevis, Robert R.

Measuring and testing

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

Specified electrical sensor or system

73779, G01L 100

Patent

active

048844535

ABSTRACT:
A strain gauge comprised of a premagnetized ferromagnetic film wherein any change in length of the film can be measured 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. Preferably, two electrically insulated strips parallel strips of amorphous metal film have (in the absence of strain) respective directions of magnetization aligned antiparallel to one another and are connected electrically at one end. Such an arrangement facilitates the reversion of the magnetization back to its easy direction when the stress causing the strain is removed.

REFERENCES:
patent: 3774134 (1973-11-01), Kardashian et al.
patent: 3838595 (1974-10-01), Godefroy
patent: 4138783 (1979-02-01), Portier
patent: 4649755 (1987-03-01), Volz
patent: 4763030 (1988-04-01), Clark et al.
Tolman et al., "Monitoring the Magnetostriction of Thin Films During Vacuum Deposition", J. Appl. Phys. 34, 580 (1963).

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