The invention relates to a dose control system configured for an injectable drug delivery device. The device comprises a disk-shaped diametral single-dipole magnet (9) attachable to a rotatable dose wheel, a housing removably attachable to the proximal extremity of the drug delivery body and comprising at least a first and a second magnetic field measurement means (8). An integrated control unit (2) is connected to the magnetic field measurement means and is configured to process information received therefrom. The magnetic field measurement means are located in the housing in a displaced axial relationship relative to the longitudinal axis of the drug delivery body and the magnet. The magnet is configured to co-rotate with the dose setting wheel and the integrated control unit is configured to provide a normalized vector with regard to the displaced axial relationship of the magnetic field measurement means, said normalized vector being derived from the measured magnetic field generated by the rotation of the magnet and measured by the magnetic field measurement means. A dose setting is calculated from said normalized vector.

A method for automatic calibration of a camshaft sensor for a motor vehicle, allowing reduction of the fluctuations on the output signal of the sensor. The method proposes comparing, on each target rotation, the new maximum values of the magnetic field of each tooth to the maximum values of the same teeth from the preceding target rotation. The switching thresholds are only calculated with the new maximum values if these differ from the maximum values of the preceding target rotation. Moreover, the invention proposes using a single minimum value of the magnetic field, i.e. the absolute minimum value on a target rotation in order to calculate the switching thresholds.

A sensor system is disclosed. The sensor system includes a first sensor path comprising a first sensing element and a second sensing element being connected in series between a first supply terminal and a second supply terminal and an intermediate node connected in between the first supply terminal and the second supply terminal, a second sensor path comprising a third sensing element and a fourth sensing element connected in series between the first supply terminal and the second supply terminal, a first reference node connected in between the first supply terminal and the second supply terminal, and a second reference node connected in between the first supply terminal and the second supply terminal, and a processing unit to receive an input signal from the intermediate node, a first reference signal from the first reference node, and a second reference signal from the second reference node.

An angle sensor includes first and second detection units and an angle detection unit. Each of the first and second detection units generates two detection signals. The first and second detection units are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit includes first and second computing circuits and an angle computing unit. The first and second computing circuits generate first and second signals in each of which an error component corresponding to a fifth harmonic contained in the detection signals is reduced. The angle computing unit calculates a detected angle value on the basis of the first and second signals. The angle computing unit performs correction processing for reducing an error occurring in the detected angle value due to an error component corresponding to a third harmonic contained in the detection signals.

A biaxial magnetoresistive angle sensor with a corresponding calibration method for magnetic field error correction, comprising two single-axis magnetoresistive angle sensors for detecting an external magnetic field in an X-axis direction and a Y-axis direction that are perpendicular to each other, a unit for calculating a vector magnitude of the voltage outputs of the single-axis magnetoresistive angle sensors along the X axis and the Y axis in real time, a unit for calculating a difference between a known calibration vector magnitude and the measured vector magnitude, a unit for dividing the difference by the square root of 2 in order to calculate an error signal, a unit for adding the error signal to the X-axis output and the Y-axis output respectively or subtracting the error signal from the X-axis output and the Y-axis output in order to calculate the calibrated output signals of the X-axis and the Y-axis angle sensors, a unit for calculating an arc tangent of a factor obtained by dividing the calibrated Y-axis output signal by the calibrated X-axis output signal to provide a rotation angle of the external magnetic field. This method for applying the magnetic field error calibration to the biaxial magnetoresistive angle sensor reduces the measurement error and expands the magnetic field application range in addition to improving the measurement precision in a high magnetic field.

According to one embodiment, a photon counting CT apparatus includes an X-ray source, a photon counting CT detector, and a calibration unit. The X-ray source includes a cathode configured to generate electrons and an anode including a plurality of targets configured to generate a plurality of characteristic X-rays having different energies. The photon counting CT detector detects X-ray photons generated by the X-ray source. The calibration unit calibrates the gain of the photon counting CT detector based on the correspondence relationship between the photon energies of the plurality of characteristic X-rays and outputs from the photon counting CT detector.

The invention relates to a dose control system configured for an injectable drug delivery device. The device comprises a substantially disk-shaped diametral single-dipole magnet removably attachable, or permanently fixed, to a rotatable dose wheel at a proximal extremity of a drug delivery device body, a housing removably attachable to the proximal extremity of the drug delivery body and comprising at least a first and a second magnetic field measurement means configured to measure the magnetic field produced by the magnet. An integrated control unit is connected to the magnetic field measurement means and is configured to process information received therefrom. The magnetic field measurement means are located in the housing in a displaced axial relationship relative to the longitudinal axis of the drug delivery body and the magnet. The magnet is configured to co-rotate with the dose setting wheel around the longitudinal axis of the drug delivery body and the integrated control unit is further configured to provide a normalized vector with regard to the displaced axial relationship of the magnetic field measurement means, said normalized vector being derived from the measured magnetic field generated by the rotation of the magnet and measured by the magnetic field measurement means. A dose setting is calculated from said normalized vector.

Provided is an absolute encoder capable of detecting the absolute angle at high resolution and with high precision. An image sensor receives light in an absolute value code pattern of a scale, an edge detecting unit detects from the received light signal an edge pixel position and an edge direction, and an edge position correcting unit corrects the edge pixel position based on the edge direction. A phase detecting unit detects from the corrected edge pixel position the phase shift amount of a shift from a reference pixel position of the image sensor, and a high precision detection unit uses a rough absolute position detected by a rough detection unit and the phase shift amount detected by the phase detecting unit to detect the absolute position with high precision.

Provided is an absolute encoder capable of detecting the absolute angle at high resolution and with high precision. An image sensor receives light in an absolute value code pattern of a scale, an edge detecting unit detects from the received light signal an edge pixel position and an edge direction, and an edge position correcting unit corrects the edge pixel position based on the edge direction. A phase detecting unit detects from the corrected edge pixel position the phase shift amount of a shift from a reference pixel position of the image sensor, and a high precision detection unit uses a rough absolute position detected by a rough detection unit and the phase shift amount detected by the phase detecting unit to detect the absolute position with high precision.

Technology for performing magnetic field gradient measurements is described. The magnetic field gradient measurements for specific positions on the Earth can be performed from a moving platform. The magnetic field gradient measurements can be identified as being affected by a level of error that exceeds a defined threshold. A correction value can be generated to compensate for the error in the magnetic field gradient measurements. The correction value can be applied to the magnetic field gradient measurements in order to obtain magnetic field gradient measurements with a reduced level of error.