Thermal compensation method for a magnetic circuit having an osc

Details Thermal compensation method for a magnetic circuit having an osc Thermal compensation method for a magnetic circuit having an osc

1985-04-12

1987-11-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

246249, 324207, 324236, 331176, 336179, H01F 1516, B61L 312, H03L 100, G01R 3300

Patent

active

047045787

ABSTRACT:
The present invention involves a thermal compensation procedure for magnetic circuits, such as those used in security devices detecting metallic masses, whose losses increase as a function of ambient temperature. According to the invention a body is placed in the immediate proximity of the magnetic circuit, the body being made of a material whose magnetic permeability is a decreasing function of temperature and whose Curie point equals the maximum possible ambient temperature.

REFERENCES:
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patent: 3662307 (1972-05-01), Tsukuda et al.
patent: 3663913 (1972-05-01), Kato et al.
patent: 3688187 (1972-08-01), Loos
patent: 3848466 (1974-11-01), Dial et al.
patent: 3891918 (1975-06-01), Ellis
patent: 4267508 (1981-05-01), Ando
patent: 4270487 (1981-06-01), Terashima et al.
patent: 4449094 (1984-05-01), MacFadden et al.
French Search Report, Feb. 8, 1985.

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