A calibrator includes: a position calculator which calculates a relative position between a first detector and a second detector on the basis of detection signals acquired respectively from the first detector, the second detector, and a third detector positioned with respect to a scale attached to a rotating body; and an error calculator which calculates error information on rotational position information of the rotating body on the basis of the relative position calculated by the position calculator as well as the detection signals.

Disclosed is a method for estimating angular errors of coders for a looped system including a rotating actuator and an angle coder producing a position measurement signal, and including a calculation device controlling the actuator, the calculation device receiving a setpoint signal, as well as the measurement signal, for looping, the calculation device calculating in a corrector a control signal. In a test phase, a specific corrector C.sub.ω.sub.rj(q) is synthesised for constant rotation speed ω.sub.rj, the corrector having substantially zero gain at the frequency and harmonics, resulting in opening the loop at the frequencies, a matrix relation is established between position measurements and a function of parameters characterizing the coder errors and the torque ripples, the test phase repeats with different speeds, the matrix relations are concatenated producing an identifiable global matrix relation, the encoder error and torque ripple parameters are estimated by resolution of the global matrix relation.

An arrangement for sensor node calibration, including a calibration chamber including or being connected to a unit to facilitate control of at least one calibration quantity or attribute in the calibration chamber, a reference measuring unit arranged to measure at least one calibration quantity or attribute inside the calibration chamber, and a computing unit arranged to obtain from at least one sensor node sensor node identifier (ID) information, sensor node measurement information, wherein the computing unit is arranged to identify a sensor node based on sensor node ID information received from the sensor node, obtain measurement information the identified 0sensor node, obtain calibration quantity or attribute measurement in-formation from the reference measuring unit, and compare calibration quantity or attribute measurement information with sensor node measurement information. Corresponding device and method are also disclosed.

An electronic device includes a rotating body coupled to a bezel part to be rotatable and including a plurality of magnets, a pair of Hall sensors configured to sense a magnetic field caused by the plurality of magnets, a magnetic sensor disposed in an internal space, and a processor configured to calibrate, based on first magnetic field data, second magnetic field data based on a calculated offset value.

Provided is a calibration apparatus including: an acquisition unit for acquiring a detection position of a mobile body for each actual position of the mobile body; a calculation unit for calculating, for a detection position of each actual position of the mobile body, an error between a slit position signal for detecting a slit position and an ideal slit number corresponding to the actual position; a determination unit for determining whether two or more actual positions having at least partially different slit numbers in units of first slits of a predefined number correspond to a same detection position; and a generation unit for generating, in response to the two or more actual positions corresponding to a same detection position, a correction value for correcting an error by a magnitude between errors at the two or more actual positions with respect to the slit position signal at the detection position.

A method for calibrating a magnetic angle sensor includes measuring, for a plurality of angle positions within a 360° rotation of a measurement object, in each case a first sensor signal for a first magnetic field component and a second sensor signal for a second magnetic field component orthogonal to the first magnetic field component, wherein the first and second sensor signals are in each case 360° periodic and representable as a Fourier series with a Fourier component of a fundamental and a Fourier component of a harmonic; determining the Fourier component of the harmonic for the first and second sensor signals based on a difference between a trajectory defined by the measured first and second sensor signals and a circular path; and correcting the angle positions based on the Fourier component of the harmonic determined for the first and second sensor signals.

Provided is a rotational positioning device capable of positioning a rotational angle at a target angle position with high precision. A rotational positioning device is provided with: a housing; a rotational member which is rotatable about a rotational member axial line and at least a part of which is accommodated in the housing; and at least one sensor installed in the housing. A graduated scale with a plurality of scale marks is formed integrally with the rotational member along the circumferential direction of the rotational member. The at least one sensor detects an angle change amount due to rotation of the rotational member on the basis of the plurality of scale marks. The rotational member is positioned at the target angle position on the basis of the angle change amount.

An image based opto-electronic encoder for a joint, the encoder having a reading head for the first part of the joint and an optical system, comprising a ball lens for the second part of the joint. The ball lens has a front surface transparent for measuring light and an at least partially reflective, structured back surface. The ball lens has -with respect to the measuring light- a refractive index of at least approximately two or an equal radially varying refractive index, such that a bundle of measuring light rays reflected inside the ball lens from a point of the back surface of the ball lens forms at least approximately a parallel bundle after getting refracted at the front surface of the ball lens. The reading head and the ball lens are rotatable relative to each other in at least two degrees of freedom.

Provided is a calibration apparatus comprising: a driving control unit to drive an object provided with a lens in a movable range for moving the object in an optical axis-direction by sequentially controlling a plurality of drive units configured to drive the object within each of a plurality of sections into which the movable range is divided, in calibration of a drive apparatus including: the plurality of drive units; and a magnetic field detection unit configured to detect a magnetic field corresponding to a position of the object; a position acquisition unit to acquire position data of the object; a magnetic field acquisition unit to acquire magnetic field data corresponding to a position of the object; and a generating unit to generate, based on the position data and the magnetic field data, end point information to determine a driving range in each of the plurality of sections.

A calibration apparatus for a rotational angle measuring system includes a measuring system shaft and a measuring system housing. The calibration apparatus includes a shaft holding device which, in a calibration position, rotates about an axis of rotation and is co-rotatably connected to the measuring system shaft, and, in a load position, is decoupled from the measuring system shaft, a rotationally static housing holding device which, in the calibration position, is co-rotatably connected to the measuring system housing, and, in the load position, is decoupled from the measuring system housing, and a drive motor which drives the shaft holding device. In the calibration position, the shaft holding device has clamping jaws which are pressable onto the radial outer side of the measuring system shaft, and/or, the rotationally static housing holding apparatus has movable pistons which are pressable onto the radial outer side of the measuring system housing.