Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1982-05-19
1985-03-05
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324 99D, 33361, G01R 3304, G01C 1728
Patent
active
045033951
ABSTRACT:
In order to measure a magnetic field, an exciting current rising in small increments is applied to a measuring probe so that the coil of the probe traverses the entire range from the negative saturation up to the positive saturation. At the secondary side, respective voltage pulses which decay according to an e-function are measured at the coil. The time constant of the voltage pulses corresponds to the respective coil inductance. Since the coil inductance is shifted relative to the zero point of the exciting current due to an external magnitude field, more voltage pulses with a high time constant are produced on one side of the zero point than on the other side. By means of digital counting of all voltage pulses whose time constant exceeds a minimum value both given a negative exciting voltage as well as given a positive exciting voltage, one obtains two measured values whose difference directly produces a measured value for a strength of the external magnetic field.
REFERENCES:
patent: 3605011 (1971-09-01), Hart
patent: 4290018 (1981-09-01), Rhodes
patent: 4300095 (1981-11-01), Rhodes
patent: 4305035 (1981-12-01), Mach et al.
Kratzer Wolfgang
Thilo Peer
Edmonds Warren S.
Siemens Aktiengesellschaft
Strecker Gerard R.
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