Single core triaxial flux-gate magnetometer
First Claim
1. A flux-gate magnetometer core which may be electrically excited to induce a magnetic field, said flux-gate magnetometer core comprising:
- a strip of a magnetically permeable material wrapped to form a toroid, said toroid having an inner circumference, an outer circumference, and a radial axis, said strip including a center portion having a pair of opposing ends and at least one longitudinal edge, a first tapered segment extending from and connected to a first end of said pair of opposing ends of said strip, said first tapered segment having at least one first tapered edge extending at a first angle relative to said at least one longitudinal edge from a first junction between said longitudinal edge and said tapered edge of said first tapered segment to a first endpoint, said first tapered segment having a first length being substantially equal to a first integer multiple of said inner circumference of the core, and a second tapered segment extending from and connected to a second end of the pair of opposing ends of said strip, said second tapered segment having at least one second tapered edge extending at a second angle relative to said at least one longitudinal edge from a second junction between said longitudinal edge and said tapered edge of said second tapered segment to a second endpoint, said second tapered segment having a second length being substantially equal to a second integer multiple of said outer circumference of the core, said first junction being substantially aligned with said second endpoint in a first vertical plane intersecting said radial axis, and said second junction being substantially aligned with said first endpoint in a second vertical plane intersecting said radial axis,whereby an induced magnetic field leaking from a first point along the first tapered edge and from a second point along the second tapered edge within a common vertical plane intersecting both the radial axis of the core and said first and second points will be substantially uniform and symmetrical about the flux-gate magnetometer core.
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Accused Products
Abstract
A single core triaxial flux-gate magnetometer including a tall-toroidal core having a radial excitation winding, two orthogonal sets of axial or circumferential output windings, and an equatorial output winding oriented orthogonal to both axial output windings. The core is fabricated from a strip of magnetic tape material wrapped to form a toroid having a height ranging from approximately equal to its diameter to one and one half times its diameter. Each end of the strip is uniformly tapered along the top and bottom edges such that the tapered segments extend around an integer multiple of complete revolutions of the wrapping, the length of each tapered segment thereby being equal to the inner or outer circumference of the toroid or an integer multiple thereof. Leakage of the induced magnetic field at any point along the edge of the tapered segment will be generally proportional to the height of the tapered segment between its edges at that point, and will extend with equal magnitude in opposite directions from the strip parallel to the planar surface of the toroid and perpendicular to the edges. The tapered segments are oriented and aligned relative to one another in the wrapped toroid such that the induced magnetic field leakage is generally symmetrical and balanced across any diameter of the core.
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Citations
17 Claims
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1. A flux-gate magnetometer core which may be electrically excited to induce a magnetic field, said flux-gate magnetometer core comprising:
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a strip of a magnetically permeable material wrapped to form a toroid, said toroid having an inner circumference, an outer circumference, and a radial axis, said strip including a center portion having a pair of opposing ends and at least one longitudinal edge, a first tapered segment extending from and connected to a first end of said pair of opposing ends of said strip, said first tapered segment having at least one first tapered edge extending at a first angle relative to said at least one longitudinal edge from a first junction between said longitudinal edge and said tapered edge of said first tapered segment to a first endpoint, said first tapered segment having a first length being substantially equal to a first integer multiple of said inner circumference of the core, and a second tapered segment extending from and connected to a second end of the pair of opposing ends of said strip, said second tapered segment having at least one second tapered edge extending at a second angle relative to said at least one longitudinal edge from a second junction between said longitudinal edge and said tapered edge of said second tapered segment to a second endpoint, said second tapered segment having a second length being substantially equal to a second integer multiple of said outer circumference of the core, said first junction being substantially aligned with said second endpoint in a first vertical plane intersecting said radial axis, and said second junction being substantially aligned with said first endpoint in a second vertical plane intersecting said radial axis, whereby an induced magnetic field leaking from a first point along the first tapered edge and from a second point along the second tapered edge within a common vertical plane intersecting both the radial axis of the core and said first and second points will be substantially uniform and symmetrical about the flux-gate magnetometer core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification