Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1989-03-09
1990-07-10
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324233, 331 55, G01R 3312, G01N 2772, H03B 2700
Patent
active
049409395
ABSTRACT:
An apparatus for measuring the magnetic content of non-metallic samples includes operating and reference sine wave oscillators of identical frequency, a mutual synchronization loop for said oscillators, and a phase meter connected to the oscillator outputs for measuring the phase shift between their oscillations, when a test sample is placed inside the inductance coil of the operating oscillator. The mutual synchronization loop includes a switchable resistive attenuator for varying the resistance of the mutual synchronization loop according to the magnetic content of the test sample, such that the phase shift between the oscillations of the oscillators, with any value of content within the specified measuring range, is not in excess of 30 deg.
REFERENCES:
patent: 3146405 (1964-08-01), Talmasky et al.
patent: 3492564 (1970-01-01), Baker, Jr.
patent: 3808524 (1974-04-01), Tarassoff
patent: 3875498 (1975-04-01), Mahan et al.
Glagovsky et al., "Kontrolno-Izmeritelnye Pribory I Osnovy Avtomatizatii Proizvodstva Abrazivnykh Instrumentov", Mashinostroenie Leningrad, 1980, pp. 126, 127.
Frenkel Larisa R.
Glagovsky Boris A.
Khait Alexandr L.
Los Vera S.
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