A system for determining a stuck point of a pipe positioned within a wellbore includes a tubular housing and a sensor array positioned within the tubular housing. The system also includes ferromagnetic flux collectors and flux concentrators on either side of the sensor array. The flux collectors collect a magnetic flux that has been written to a portion of pipe. The flux concentrators intensify the flux to improve measurements of the flux that are acquired by the sensor array.

The present invention discloses a magnetic rolling bearing capable of reducing the balance radial force of the gear pump, which includes a magnetized inner ring, a rolling body, a cage, and a magnetized outer ring assembly. The inner ring is magnetized to make the inner and outer ring surfaces of the magnetized inner ring have different magnetic properties; the magnetized outer ring assembly consists of four components, namely an upper ring surface of the magnetized outer ring assembly, a lower ring surface of the magnetized outer ring assembly, and two components in left and right. The left and right components are not magnetized, they are connected by recesses and are fixed with bolts, and the four components are alternately connected to form a complete ring.

The invention is directed to a sensor system (100) for increasing security of a use of at least one magnetic object (102) in vicinity of an MR imaging device (200), wherein at least one magnetic property of the magnetic object (102) can be measure and evaluated in order to increase the safe use of the magnetic object (102) within MR environments.

The invention is directed to a sensor system (100) for increasing security of a use of at least one magnetic object (102) in vicinity of an MR imaging device (200), wherein at least one magnetic property of the magnetic object (102) can be measure and evaluated in order to increase the safe use of the magnetic object (102) within MR environments.

A sensor device comprising: a lead frame; a first/second semiconductor die having a first/second sensor structure at a first/second sensor location, and a plurality of first/second bond pads electrically connected to the lead frame; the semiconductor dies having a square or rectangular shape with a geometric center; the sensor locations are offset from the geometrical centers; the second die is stacked on top of the first die, and is rotated by a non-zero angle and optionally also offset or shifted with respect to the first die, such that a perpendicular projection of the first and second sensor location coincide.

A method for determining at least one property of magnetic matter includes: applying a magnetic field to magnetic matter; directing first light on the magnetic matter at a first set of incident angles; receiving a first set of signatures associated with the first light scattered from the magnetic matter; varying orientation of the magnetic matter with respect to the magnetic field; directing second light on the magnetic matter at a second set of incident angles; receiving a second set of signatures associated with the second light scattered from the magnetic matter; determining, by processing the first set and the second set of signatures according to a dispersion relation, at least one property of the magnetic matter.

Reduction of the S/N in an output from a magnetic sensor using the magnetic impedance effect is suppressed. A magnetic sensor 1 is provided with a sensitive element 31 including: plural soft magnetic material layers 105; and a nonmagnetic amorphous metal layer 106 provided between the plural soft magnetic material layers 105, wherein the soft magnetic material layers 105 facing each other with the nonmagnetic amorphous metal layer 106 interposed therebetween are antiferromagnetically coupled to sense a magnetic field by a magnetic impedance effect.

A measurement apparatus acquires actually-measured closed magnetic path curve data, actually-measured open magnetic path curve data, and a surface magnetic property value; calculates, for each divided region obtained by sectioning and dividing the permanent magnet, by using a function including a parameter that determines distribution of magnetic property of the permanent magnet, a magnetic property value of the divided region based on an internal magnetic property value extracted from the actually-measured closed magnetic path curve data and the surface magnetic property value; calculates estimated open magnetic path curve data indicating a magnetization curve of the permanent magnet, based on a magnetic property value and the actually-measured closed magnetic path curve data; changes a value of the parameter to minimize a magnetization difference between the actually-measured open magnetic path curve data and the estimated open magnetic path curve data; and outputs a magnetic property value of each of the divided regions.

A magnetic sensor module includes an axially polarized back bias magnet having a magnet body that radially extends from an inner sidewall to an outer sidewall and a bore that defines the inner sidewall. The axially polarized back bias magnet generates a radial bias magnetic in-plane field about a magnetization axis of the axially polarized back bias magnet in a sensor plane. The magnetic field has a magnetic flux density of substantially zero along the extension of the magnetization axis and along a perimeter of a zero-field closed loop located in the sensor plane. The magnetic sensor module includes a magnetic sensor including a plurality of sensor elements arranged in the sensor plane at locations where the radial bias magnetic in-plane field has the magnetic flux density of substantially zero, including at least two sensor elements being arranged on the perimeter of the zero-field closed loop.

A sensing system, and method of operating same, can act as a highly sensitive gradiometer. A first non-magnetic element, such as a sphere, is driven at a first resonance frequency along an axis. A magnet is attached to a second non-magnetic element, such as a plate, and driven at a second resonance frequency along the axis. The first non-magnetic element and the second non-magnetic element are coupled by a force along the axis, in resonance. The gradiometer is configured to determine a gradient magnetic field acting on one or more of the first non-magnetic element and magnet based on change in at least one resonance characteristic.