Class / Patent application number | Description | Number of patent applications / Date published |
324246000 | With means to align field sensor with magnetic field sensed | 8 |
20080297150 | ARRANGEMENT FOR MAGNETIC FIELD MEASUREMENT - The invention concerns an arrangement for magnetic field measurement of a measurement object (in particular a gradient coil in a magnetic resonance apparatus) with a magnetic field sensor that is designed to measure a magnetic field of the measurement object and with a measurement mechanism on which the magnetic field sensor is arranged at a first position. The measurement object has detectable reference points that can be used for calibration of a spatial position of a position sensor. The calibrated position sensor is arranged at a second position of the measurement mechanism, such that, with the first position and the second position, a spatial position relative to the measurement object can be associated with each magnetic field strength that is measured by the magnetic field sensor. | 12-04-2008 |
20090128143 | Systems and Methods for RF Magnetic-Field Vector Detection Based on Spin Rectification Effects - Systems and methods for RF magnetic-field vector detection based on spin rectification effects are described. In one embodiment, a method comprises sweeping a quasi-static external applied magnetic field at a h-vector detector, measuring voltages across terminals of the h-vector detector when the detector receives a microwave, varying the angle between the external applied static magnetic field and the RF current, determining an angular dependence of the measured voltages, and calculating a magnetic-field vector (h-vector) component of the microwave. In another embodiment, a method comprises providing an array of h-vector detectors, each element of the array being positioned at a different angle with respect to each other, subjecting the array to an external swept quasi-static magnetic field, measuring voltages across terminals of each element of the array when the array receives a microwave, associating each measured voltage with a respective angle, and calculating at least one h-vector component of the microwave. | 05-21-2009 |
20090189602 | METHOD AND APPARATUS FOR OBSERVING A MAGNETIC FIELD DECOUPLED FROM AN ELECTROMAGNETIC FIELD - A method for observing a magnetic field decoupled from an electromagnetic field including three fundamental steps, including producing a magnetic field with an electromagnetic field producing means, maneuvering a magnetometer to observe the magnitude and delineation of said magnetic field, and observing the decoupling a magnetic field from the electromagnetic field. In a preferred embodiment the apparatus for practicing the method includes a power supply circuit for maintaining a constant direct current source. Activating the power supply causes a current to flow through the coil of a solenoid, thus creating a magnetic field inside the solenoid, preferably having a hollow low carbon steel core. The apparatus for examining the magnetic field consists of a magnetometer including a hook for hanging a specimen from a non-ferrous dowel. The system includes a ferrous specimen and a non-ferrous specimen. When current flows in the coil, the electromagnetic field turns into a (time dependent) magnetic field, while the electric field becomes zero. Maneuvering the specimen up and down in the electromagnetic field of the coil causes the ferrous specimen to rotate, while the non-ferrous specimen does not rotate. | 07-30-2009 |
20100026287 | Method and Device for Measuring an Angle at which a Magnetic Field is Aligned in a Plane Relative to a Reference Axis - A device for measuring an angle at which a magnetic field is aligned in a plane relative to a reference axis has at least two magnetic field sensors, which are aligned with their measurement axes in and/or parallel to the plane and oriented at right angles to each other. The device has a PLL phase control circuit with a follow-on oscillator arranged in a phase control loop, which has at least one oscillator output for a digital oscillating signal The magnetic field sensors are coupled to the phase control loop in such a way that the digital oscillating signal is phase synchronous with a rotation scanning signal formed by rotary scanning of the measurement signals of the magnetic field sensors. The oscillator output is connected to a phasing detector for determining the phasing of the digital oscillating signal. | 02-04-2010 |
20110175604 | STABILIZATION SYSTEM FOR SENSORS ON MOVING PLATFORMS - A stabilized field sensor apparatus collects field data, in particular magnetic field data, with reduced motion noise. The apparatus includes a tear drop shaped housing, a tow frame in the housing, a plurality of vibration isolating dampers spaced around the frame, a base assembly mounted to the dampers, a support pedestal having a bottom end fixed to the base assembly and an upper free end, a single spherical air bearing connected to the upper free end of the pedestal, an instrument platform with a lower hollow funnel having an upper inside apex supported on the air bearing for a one point support, principal and secondary gyro stabilizers for maintaining pivotal and rotational stability, and at least one field sensor mounted to the instrument platform for collecting the field data while being stabilized against motion noise including vibration, pivoting and rotation from the base assembly, from the tow frame and from the housing. Stabilization of the instrument platform is enhanced by preserving accurate balance through a dynamic balancing system whereby small masses are moved under computer control to maintain the center of mass of the instrument platform at the center of rotation of the spherical air bearing. The dynamic stabilization process is made more precise by actively vibrating the instrument platform by a set of linear vibrators. | 07-21-2011 |
20110221431 | FABRICATING METHOD OF MAGNETIC AXIS CONTROLLED STRUCTURE - Provided is a method of fabricating a magnetic axis-controlled structure. The method of fabricating a magnetic axis-controlled structure includes providing a composition including magnetic nanoparticles dispersed in a liquid medium, applying a magnetic field to the composition to align the magnetic nanoparticles along the magnetic field and form a magnetic axis, and solidifying the liquid medium to fix the magnetic axis. | 09-15-2011 |
20130106410 | APPARATUS AND METHOD FOR RESET AND STABILIZATION CONTROL OF A MAGNETIC SENSOR | 05-02-2013 |
20150054502 | APPARATUS AND METHOD FOR RESET AND STABILIZATION CONTROL OF A MAGNETIC SENSOR - A magnitude and direction of at least one of a reset current and a second stabilization current (that produces a reset field and a second stabilization field, respectively) is determined that, when applied to an array of magnetic sense elements, minimizes the total required stabilization field and reset field during the operation of the magnetic sensor and the measurement of the external field. Therefore, the low field sensor operates optimally (with the highest sensitivity and the lowest power consumption) around the fixed external field operating point. The fixed external field is created by other components in the sensor device housing (such as speaker magnets) which have a high but static field with respect to the low (earth's) magnetic field that describes orientation information. | 02-26-2015 |