Patent US3736502A successfully refreshed from Google Patents.
US3736502A
Expired / Lapsed
US
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Series string flux gate magnetic sensor apparatus with additive response
Assignee: Schonstedt Instrument Co LLC
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Filing: 1971-01-28
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Granted: 1973-05-29
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Expires: 1991-01-28
Abstract
Abstract Multiple-unit, flux-gate, magnetic sensor apparatus in which a single excitation wire passes through the magnetic cores of the sensor units in succession. The signal pickup windings of the units are connected in series, the polarity of certain windings being opposite to that of others for balancing out ambient fields, and DC being supplied to the pickup windings for neutralizing any residual unbalance. A string of magnetic sensor units may be employed in the frame of a doorway for perimeter surveillance to detect magnetic articles such as guns. The units are arranged in pairs, with signal winding polarities selected to produce additive response.
Inventors
- 👤 E Schonstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:32
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/081
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
Magnetic sensor apparatus comprising a plurality of magnetic sensor units, each having an elongated hollow magnetic core surrounded by a signal pickup coil wound about the core, an excitation wire extending through each core only once and extending through said cores in succession, means for supplying excitation oscillations to said excitation wire, and means for responding to signals in said pickup coils due to magnetic disturbances near said sensor units at least a pair of said sensor units being arranged at opposite sides of a region to be monitored, with the pickup coils of said pair connected for producing an additive output therefrom of the same polarity in response to the magnetic field from an object therebetween.
Claim 2
Dependent Claim
117 words
Magnetic sensor apparatus comprising a plurality of magnetic sensor units, each having an elongated hollow magnetic core surrounded by a signal pickup coil wound about the core, an excitation wire extending through each core only once and extending through said cores in succession, means for supplying excitation oscillations to said excitation wire, and means for responding to signals in said pickup coils due to magnetic disturbances near said sensor units at least a pair of said sensor units being arranged at opposite sides of a region to be monitored, with the pickup coils of said pair connected for producing an additive output therefrom of the same polarity in response to the magnetic field from an object therebetween.
Claim 3
Dependent Claim
43 words
Apparatus in accordance with claim 1, there being a plurality of such pairs, with the pickup coils of some of the units of such pairs connected to pickup coils of units of other pairs in phase opposition for balancing out ambient field effects.
Claim 4
Dependent Claim
15 words
Apparatus in accordance with claim 2, all of said pickup coils being connected in series.
Claim 5
Dependent Claim
68 words
Magnetic sensing apparatus, comprising a plurality of pairs of magnetic sensors, the sensors of each pair being arranged at opposite sides of a region to be monitored, at least one pair having means for producing additive signals of the same polarity in response to a magnetic object therebetween, and some of said sensors having means for compensating for the response of other of said sensors to ambient fields.
Claim 6
Dependent Claim
68 words
Magnetic sensing apparatus, comprising a plurality of pairs of magnetic sensors, the sensors of each pair being arranged at opposite sides of a region to be monitored, at least one pair having means for producing additive signals of the same polarity in response to a magnetic object therebetween, and some of said sensors having means for compensating for the response of other of said sensors to ambient fields.
Claim 7
Dependent Claim
44 words
Apparatus in accordance with claim 4, further comprising means for connecting the signals of said sensors in series, said compensating means comprising connection of the signal of a sensor of one pair in phase opposition to the signal of a sensor of another pair.
Claim 8
Dependent Claim
39 words
Apparatus in accordance with claim 4, wherein said sensors are of the type having magentic cores, having excitation wires coupled to said cores and connected in series, and having pickup coils coupled to said cores and connected in series.
Claim 9
Dependent Claim
14 words
Apparatus in accordance with claim 6, wherein said sensors are of the flux-gate type.
Claim 10
Dependent Claim
24 words
Apparatus in accordance with claim 6, further comprising means for applying direct current to said pickup coils to neutralize residual response to ambient fields.
Claim 11
Dependent Claim
124 words
Magnetic sensor apparatus comprising a plurality of magnetic sensor units, each unit including an elongated hollow magnetic core contained longitudinally within a cylindrical housing having end closures at opposite ends of the core, an excitation wire extending through said sensor units in succession, said wire passing through both of the end closures and the core of each of said units and being bent laterally at the outer side of each end closure sufficiently to maintain the position of each unit relative to the excitation wire, means for supplying excitation oscillations to said excitation wire, each sensor unit having a pickup coil wound about the housing thereof, and means for responding to signals in said pickup coils due to magnetic disturbances near said sensor units.
Claim 12
Dependent Claim
124 words
Magnetic sensor apparatus comprising a plurality of magnetic sensor units, each unit including an elongated hollow magnetic core contained longitudinally within a cylindrical housing having end closures at opposite ends of the core, an excitation wire extending through said sensor units in succession, said wire passing through both of the end closures and the core of each of said units and being bent laterally at the outer side of each end closure sufficiently to maintain the position of each unit relative to the excitation wire, means for supplying excitation oscillations to said excitation wire, each sensor unit having a pickup coil wound about the housing thereof, and means for responding to signals in said pickup coils due to magnetic disturbances near said sensor units.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |