Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1989-02-16
1990-05-01
Raevis, Robert R.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73DIG2, 7386269, G01L 100
Patent
active
049208063
ABSTRACT:
A strain gage includes a pair of coils printed on one face of a substrate and an amorphous magnetic metallic plate arranged on the other face of said substrate and having magnetostrictive effect. Magnetic flux generated by one of the paired coils passes through the amorphous magnetic metallic plate and links with the other of the coils. When load is added to an object and strain of the object is caused by the load added, therefore, the magnetic permeability of the amorphous magnetic metallic plate is changed, due to the magnetostrictive effect, in response to the load added. The density of the magnetic flux passing through the magnetic metallic plate is also changed responsive to this changing magnetic permeability and composite inductance of the paired coils is then changed responsive to the changing density of the magnetic flux. The strain gage outputs a detection signal, which represents the changing density of the magnetic flux, thereby measuring the load added or strain of the object caused by the load added. The detecting sensitivity of the strain gage is more remarkably enhanced as compared with that of the conventional one. Further, the strain gage has a higher reliability and can be handled with more easiness.
REFERENCES:
patent: 3299382 (1967-01-01), Tanaka et al.
patent: 3453876 (1969-07-01), Radus
patent: 3866462 (1975-02-01), Fraudin
patent: 4596150 (1986-06-01), Kuhr
Kikuchi Masaaki
Obama Masao
Kabushiki Kaisha Toshiba
Raevis Robert R.
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