In one aspect the invention provides a magnetic door position detection apparatus adapted to attach to a cabinet interior with a door arranged to transition between an open state where the interior of the cabinet is accessible, and a closed state. The door includes a magnetic field generating structure configured to magnetically engage the door with the cabinet in the closed state. The apparatus provided includes a housing configured to attach to the interior of the cabinet and one or more sensors configured to determine change in the magnetic flux field within the interior of the cabinet induced by motion of the magnetic field generating structure in at least one of three orthogonal axes. The sensor or sensors generate an output signal representing the sensed magnetic field change where the one or more axes is indicative of the cabinet door moved between the closed state and the open state.

A sensor calibration system includes a controller configured to receive a first electrical output generated by a sensor while submitted to a first input condition and a second electrical output generated by the sensor while submitted to a second input condition. The first and second electrical outputs represent lower and upper limits, respectively, of a sensor measurement range. The controller obtains a first reference value that corresponds to the lower limit and a second reference value that corresponds to the upper limit, and determines a drift function of the sensor based on a value of the first electrical output, a value of the second electrical output, the first reference value, and the second reference value. The controller inputs a value of a raw electrical output generated by the sensor into the drift function to determine an adjusted value of the raw electrical output.

Embodiments of the invention include a resonant sensing system comprising driving circuitry to generate a drive signal during excitation time periods, a first switch coupled to the driving circuitry, and a sensing device coupled to the driving circuitry via the first switch during the excitation time periods. The sensing device includes beams to receive the drive signal during a first excitation time period that causes the beams to mechanically oscillate and generate a first induced electromotive force (emf) in response to the drive signal. The first switch decouples the sensing device and the driving circuitry during measurement time periods for measurement of the induced emf.

A method for setting a gain of a magnetic field sensor includes providing the magnetic field sensor and an evaluation unit on a same printed circuit board, generating a magnetic field signal with the magnetic field sensor, transmitting the magnetic field signal to the evaluation unit, evaluating the magnetic field signal with the evaluation unit, and transmitting a signal for setting the gain from the evaluation unit to the magnetic field sensor. In an example embodiment, the magnetic field sensor is a rotor position sensor of an electric motor.

A landing gear system includes a landing gear collar and a strut assembly supported by the landing gear collar. The strut assembly includes a piston that is adjustable between a fully extended position and a fully compress position. The landing gear system further includes a rotary encoder and a controller. The rotary encoder rotates in response adjusting the piston and to outputs a data value in response to its rotation. The controller is in signal communication with the rotary encoder and determines a stroke of the piston based on the data value output from the rotary encoder.

The embodiments are a method and an apparatus for calibrating a joystick and a remote control device. The method includes: obtaining sampling parameters of a target point when a joystick is in a calibration mode; obtaining a maximum angle value to which the joystick is moved; calculating a calibration parameter of the target point according to the sampling parameters and the maximum angle value; and calibrating the joystick according to the calibration parameter. According to the implementation, a calibration function of the Hall joystick is realized. A whole process is simple, complexity of calibrating the Hall joystick is reduced and the implementation is suitable for most of remote control devices with Hall joysticks, which has relatively strong universality.

A method for carrying out a diagnosis of a sensor system. The method including: (i) ascertaining a processing specification of a test signal and/or of a characteristic physical variable and/or its respective change as a function of at least one part-specific property of the sensor system; and (ii) carrying out a subsequent diagnosis of a sensor element of the sensor system, using the processing specification ascertained in (i).

A system automatically calibrates gains and/or offsets for each position feedback signal in order to reduce variations between position feedback signals for each sensor in a linear drive system. As a mover travels along a track segment, the segment controller records the position feedback signal output from each position sensor corresponding to a magnet on the mover passing the position sensor. The segment controller periodically monitors the position feedback values generated by one mover as it travels along the track segment and automatically updates the sensor gains as a function of a ratio of a target peak value to a measured peak value of the position feedback signal. The segment controller also records the position feedback signal from each sensor when no mover is traveling past the sensor. The segment controller periodically monitors the position feedback values received when no mover is present and automatically updates sensor offset values.

The present teaching relates to apparatus, method, medium, and implementations for simultaneously calibrating multiple sensors of different types. Multiple sensors of different types are first activated to initiate simultaneous calibration thereof based on a 3D construct including a plurality of fiducial marks. Sensors of different types including visual and depth based sensors operate in their respective coordinate systems. Each of the sensors is calibrated by acquiring sensor information of the 3D construct, detecting a feature point on each of the plurality of fiducial markers based on the sensor information, estimating a set of 3D coordinates, with respect to its coordinate system, corresponding to the detected feature points, based on which calibration parameters are generated. Sets of 3D coordinates derived in different coordinate systems are then used to compute at least one transformation matrix for corresponding at least one pair of the plurality of sensors.

Methods and apparatus are disclosed for calibration determinations for handheld moisture meters in the field. A calibration reference stand emulates a sample with an equivalent moisture content, allowing rapid determination whether a moisture meter is out of calibration, or determination of a new calibration value. The calibration reference stand includes an electromagnetic load, which can be formed of a metal sheet or high dielectric constant material, supported on a platform, and mechanical fixturing for reproducible positioning of a moisture meter on the stand. Associated methods and variations are disclosed.