Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-10-07
1977-01-25
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
040053580
ABSTRACT:
An improved magnetometer for measuring the magnetic moment of a sample. Signals representative of magnetic moment are provided in known phase relation with respect to a driving signal and in phase with the motion of the sample, while spurious signals, such as produced by eddy currents are in an out-of-phase relationship with sample motion. Distortions in the measured magnetic moment due to eddy currents and other out-of-phase spurious signals are eliminated by cancellation of the out-of-phase signals through an AC feedback network.
An output signal comprising the magnetic moment signal and spurious signals is applied to a phase sensitive detector whose DC output represents the amplitude of the spurious out-of-phase signal which it is sought to eliminate. The detector output may be used to control a variable amplifier which in turn supplies an AC signal in a feedback arrangement to either a reference signal source or to summing means which combines the reference signal with the output signal in order to cancel the out-of-phase signal. Alternatively, the AC feedback signal may be supplied by a manually controlled attenuator or amplifier in response to the detector output.
A dc compensating signal proportional to the out-of-phase detector output may also be supplied to the magnetometer output to provide a correction for out-of-phase effects including those which do not exhibit a constant phase relationship to sample motion. The invention is useful with AC magnetometers generally, including vibrating sample, rotating sample and alternating force magnetometers.
REFERENCES:
patent: 3663953 (1972-05-01), Salvi
Foner, S.; "Versitile and . . . "; The Rev. of Sci. Inst; vol. 30; No. 7; July 1959; pp. 548-547.
Karlsen Ernest F.
Rolinec R. V.
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