The present invention relates to a field-sensor device comprising a reference field sensor providing a reference sensor signal in response to a field, a calibrated field sensor providing a calibrated sensor signal in response to the field, a reference circuit connected to the reference field sensor and adapted to receive a reference signal, and an adjustable circuit connected to the calibrated field sensor and adapted to receive a calibrated signal. When the adjustable circuit is adjusted with the calibrated signal, said calibrated signal being different from the reference signal, the calibrated field sensor provides a calibrated sensor signal substantially equal to the reference sensor signal. The field sensor device is arranged to be exposed, when in a calibration mode, to a uniform calibration field and, when in operational mode, to an operational field being a field gradient.

To facilitate a change in the number and layout of magnetic field detection devices to be arranged in an array. A magnetic field detection device includes a cancel coil wound around a bobbin, a cover member fixed to the bobbin and covering the cancel coil in a direction perpendicular to the axial direction of the cancel coil, and magnetic sensors fixed to the bobbin or cover member. The cover member has side surfaces and extending in the z-direction and positioned on mutually opposite sides. The side surfaces have first and second engagement portions, respectively, and the first engagement portion has a shape engageable with the shape of the second engagement portion. This makes it possible to arrange a desired number of the magnetic field detection devices.

The present disclosure provides, in part, methods for high spatiotemporal resolution self-sorted 4D MRI. These methods can be used to improve resolution of abdominothoracic MRI during breathing by facilitating the sorting of information corresponding to individual MRI pulse sequences according to phase within the respiratory cycle. An image of the anatomy for a particular phase within the respiratory cycle is then determined using both information corresponding to the particular phase and high-frequency MR imaging information corresponding to other respiratory phases. This method provides an increase in image resolution by sharing information at high frequencies in k-space, which may be less thoroughly sampled during any particular respiratory phase, between different respiratory phases. Methods herein also permit use of DC information from individual MRI pulse sequences to determine respiratory tissue motion and to use this tissue motion information to sort the individual MRI pulse sequences according to respiratory cycle phase.

The iron loss of an iron core excited by an inverter power supply is reduced. A modulation operation-setting device 1430 for the inverter power supply controls a maximum value Hmax and a minimum value Hmin of a field intensity H in at least one minor loop such that the loss (iron loss, copper loss, and switching loss) of the entire system is less than the loss of the entire system when an electric device is operated with a target waveform (excluding harmonics).

The present disclosure relates to a magnetic field sensor circuit including at least one coil for measuring a magnetic field, a first stage amplifier circuit coupled to the coil and having a first transfer function with a pole at a first frequency, and a second stage amplifier circuit coupled to an output of the first stage amplifier circuit and having a second transfer function with a zero at the first frequency. In some embodiments, a temperature dependent frequency drift of the pole of the first transfer function corresponds to a temperature dependent frequency drift of the zero of the second transfer function.

A magnetoresistive magnetic field probe with rotating electromechanical modulator (1) comprises: a bulk cylindrical base (11), wherein the bulk cylindrical base (11) has a cavity structure, and a center axis of the bulk cylindrical base (11) overlaps with a z-axis of a cylindrical coordinate system; a first magnetic tile (12) and a second magnetic tile (13) attached to an outer side wall of the bulk cylindrical base (11); and a magnetoresistive sensor (14) and a reference signal generator (15) located on the center axis of the bulk cylindrical base (11). During operation, the bulk cylindrical base (11) rotates about the z-axis at a frequency f, and the first magnetic tile (12) and the second magnetic tile (13) modulate an external magnetic field into a sensed magnetic field having a frequency 2f, and a measurement signal having a frequency 2f is output via the magnetoresistive sensor (14). The reference signal generator (15) outputs a reference signal having a frequency 2f. The reference signal and the measurement signal are demodulated by an external processing circuit (4) to output a magnetic field value, so as to provide a measurement of the external magnetic field with superior signal-to-noise ratio. Through adding a detachable rotating sleeve to the magnetoresistive sensor (14), superior signal-to-noise ratio measurement of the external magnetic fields can be realized. This invention is small in size with a simple structure, and the complexity of the process is also greatly reduced, enabling lower cost.

A sensor comprising: a first magnetoresistive (MR) bridge having a first stray field sensitivity; a second MR bridge having a second stray field sensitivity; and a driver circuitry configured to: (i) supply a first voltage to the first MR bridge, and (ii) supply a second voltage to the second MR bridge that is different from the first voltage, wherein supplying the first voltage and the second voltage to the first MR bridge and the second MR bridge, respectively, causes the first stray field sensitivity to match the second stray field sensitivity.

A magnetic field detection apparatus includes a magnetoresistive effect element and a coil. The coil includes first and second tier parts opposed to each other in a first axis direction, with the magnetoresistive dal element interposed therebetween. The coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect element in a second axis direction. The first tier part includes first conductors extending in a third axis direction, arranged in the second axis direction and coupled in parallel to each other. The second tier part includes a second conductor or second conductors extending in the third axis direction, the second conductors being arranged in the second axis direction and coupled in parallel to each other. The first conductor each have a width smaller than a width of the second conductor or each of the second conductors.

A magnetic sensor integrated circuit, a motor and an application apparatus are provided. The magnetic sensor integrated circuit includes an input port, a magnetic sensor, and a signal processing unit. The input port is electrically coupled to an external power source. The magnetic sensor senses a polarity of an external magnetic field and outputting a detection signal. The signal processing unit includes a switched capacitor filter unit to sample and filter the detection signal; the signal processing unit eliminating an offset of the detection signal.

A magnetic field sensor arrangement includes a magnetic field sensor element configured to provide a sensor output signal responsive to a magnetic field, wherein the sensor output signal is representative of a magnetic field amplitude; a processing module configured to provide a processed sensor output signal representative of the sensor output signal; a switching level calculation module configured to calculate a switching level, (1) during a power up mode, based on a default switching level, and (2) during a running mode, based on the processed sensor output signal; a comparator module configured to compare the processed sensor output signal with the switching level, and to provide a comparator output signal based on the comparison; and a storage module configured to store the default switching level, provide the default switching level during the power up mode, and update the default switching level during the running mode.