A method for determining a sensitivity of a Hall sensor element in consideration of an interdependency between the temperature dependence of the sensitivity and the temperature dependence of the operational quantity of the Hall sensor element includes: identifying a reference sensitivity and a reference value of the operational quantity of the Hall sensor element; determining an instantaneous value of the operational quantity of the Hall sensor element on the basis of a drive signal of the Hall sensor element; and determining the sensitivity of the Hall sensor element on the basis of the reference sensitivity, the reference value of the operational quantity, the identified instantaneous value of the operational quantity, and the interdependency.

A magnetometer sensor that detects tampering is described. The sensor samples magnetometer data and computes a set of vectors based on the magnetometer data. The sensor detects a tampering of the magnetic sensor based on determining that the set of vectors is outside the reference plane for the magnetometer sensor. The sensor generates a notification to a security system coupled to the magnetometer sensor. The notification indicating the tampering of the magnetometer sensor.

Disclosed herein are systems and methods for a three-dimensional (3D) non-contact position sensor. A system includes a magnetic target coupled to and/or integrated with a target object and a position sensor comprising a plurality of magnetometers configured to provide a set of magnetic flux values corresponding to a magnetic field generated by the magnetic target. A logic device receives the set of magnetic flux values provided by the plurality of magnetometers of the position sensor and determines a position and/or orientation of the target object based, at least in part, on the received set of magnetic flux values. The position and/or orientation of the target object may be used as feedback to help position and/or orient the target object according to a desired position and/or orientation or to track its position accurately in real-time.

A device with position detection includes: a first hall element; a second hall element; a differential amplifier configured to generate a subtraction voltage by differentially amplifying a first hall voltage generated by the first hall element and a second hall voltage generated by the second hall element; a summing amplifier configured to generate a sum voltage by summatively amplifying the first and second hall voltages; a comparer configured to compare a reference voltage with the subtraction voltage to generate an error voltage; and a current converter configured to generate a bias current provided to the first and second hall elements, based on the error voltage, wherein the device is configured to detect a position of a detection object based on the sum voltage.

A system includes a first amplifier and a first Hall sensor group coupled to the first amplifier. The system includes a second amplifier and a second Hall sensor group coupled to the second amplifier, where the second Hall sensor group includes a spinning Hall group. The system includes a first demodulator, where the first demodulator input is coupled to the first amplifier output. The system includes a second demodulator, where the second demodulator input is coupled to the second amplifier output. The system also includes a subtractor, the first subtractor input coupled to the first demodulator output, and the second subtractor input coupled to the second demodulator output. The system includes a filter coupled to the subtractor output and to a second input of the first amplifier, and a calibration module coupled to the subtractor output.

A resistive sensor system includes resistive sensor pairs formed of first and second sensors of opposite sensitivity directions to a measured property. Each resistive sensor pair includes one of the first sensors having a first terminal and a second terminal, and one of the second sensors having a third terminal and a fourth terminal. The fourth terminal is coupled to the second terminal of the first sensor. The system further includes multiple noninverting switch elements, each having a noninverting output coupled to the first terminal of one the first sensors, and multiple inverting switch elements, each having an inverting output coupled to the third terminal of one of the second sensors. For each resistive sensor pair, the noninverting and inverting switch elements receive a switch signal for controlling the noninverting and inverting switch elements such that the first and second sensors are biased in opposition to one another.

A control device configured to communicate with a first projector which projects a first image in a first projection area, and a second projector which projects a second image in a second projection area having a first overlap area overlapping the first projection area to make the first projector and the second projector perform an edge blending process includes a reception section for receiving input of designation information including a direction in which an overlap width, a generation section for generating first overlap information including information representing first side in the first overlap area and information representing the overlap width of the first overlap area, and second overlap information including information representing second side in the first overlap area and the information, and a transmission section for transmitting the first overlap information to the first projector, and the second overlap information to the second projector.

Methods and apparatuses are provided, in which a magnetic field is measured using a coil in a first operating mode and a magnetic field is generated using the coil in a second operating mode in order to test a further magnetic field sensor.

Methods for determining performance information for an object located within an area include obtaining magnetic field information for the area, measuring first magnetic field data when the object is located at a first position within the area, and determining performance information for the object within the area based on the magnetic field information for the area and the first magnetic field data.

A system for calibrating alignment of two or more sensors in a virtual reality (VR) or augmented reality (AR) display device, the two or more sensors in the display device including at least one magnetic sensor. The system can include a first pair of conductive loops oriented in parallel planes and spaced apart along a first axis. The system can also include a mount configured to attach to the display device and to support the display device in a first predetermined spatial relationship with respect to the first pair of conductive loops.