US3736502A — Series string flux gate magnetic sensor apparatus…

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.

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

Series string flux gate magnetic sensor apparatus with additive response

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