Method of operating an amorphous-magnetic-alloy sensor

Details Method of operating an amorphous-magnetic-alloy sensor Method of operating an amorphous-magnetic-alloy sensor

1986-04-18

1989-03-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Stress in material measurement

73728, 73DIG2, G01B 724, G01R 3318, G01L 916

Patent

active

048127582

ABSTRACT:
The long-term measurement stability of a magnetostrictive effect strain or stress sensor that uses an amorphous magnetic alloy excited by a magnetic field is improved by generating a magnetic field from an electric current formed from a superposed alternating current waveform and a recurring rectangular current waveform that has a larger amplitude at its start-up and which converges to a smaller amplitude after a predetermined time period or an electric current formed from a superposed direct current component and an alternating current component having constant amplitude and a frequency that varies in a recurring manner between a high frequency and a lower frequency.

REFERENCES:
patent: 4412454 (1983-11-01), Yamashita et al.
patent: 4625562 (1986-12-01), Yamashita et al.
JP-A-58 221 139 Patent Abstracts of Japan, vol. 8, No. 75 (p. 226) [1512] 7th Apr. 1984; (Matsushita Denki Sangyo K.K.)
JP-A-57 79 461 Patent Abstracts of Japan, vol. 6, No. 162 (p-137) [1040] 25 Aug. 1982 (Hitachi Seisakusho).
WO-A-79/00 369 Jilkon, Leif, 28 Jun. 1979.

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