Abstract: A method is used to calibrate a light unit, including at least one light source, the light unit being part of a medical imaging apparatus. In an embodiment, the method includes positioning a calibration phantom at a calibration position, in particular a first calibration position; arranging the light source so that its beam illuminates the photodetector at least partially; starting or continuing the recording of light intensities using the photodetector; modulating the signal of the light source at least once; rotating the light beam around a given rotation axis while recording the rotational position; synchronizing the time values of the rotational position of the light beam and the acquired signal intensities using the modulation of the light signal; and mapping the rotational position, in particular the rotation angle, of the light beam to a spatial position using the light intensities recorded by the photodetector.

Abstract: A method is used to calibrate a light unit, including at least one light source, the light unit being part of a medical imaging apparatus. In an embodiment, the method includes positioning a calibration phantom at a calibration position, in particular a first calibration position; arranging the light source so that its beam illuminates the photodetector at least partially; starting or continuing the recording of light intensities using the photodetector; modulating the signal of the light source at least once; rotating the light beam around a given rotation axis while recording the rotational position; synchronizing the time values of the rotational position of the light beam and the acquired signal intensities using the modulation of the light signal; and mapping the rotational position, in particular the rotation angle, of the light beam to a spatial position using the light intensities recorded by the photodetector.

Abstract: A magneto-elastic force sensor includes a sensor head (1) that has an emitting coil (9) which generates a magnetic field and at least one magnetic field sensor (11) for measuring a magnetic flux caused by the magnetic field of the emitting coil (9) in a measured object (13). The sensor head (1) also includes a recorder (14) for recording an electrical value that reflects the inductivity of the emitting coil (9) or that is clearly connected to the latter. The magneto-elastic force sensor allows for compensation of a distance dependency in the measurement signal by ascertaining the distance between the emitting coil (9) or the sensor head (1) and the measured object (13) based on the recorded electrical value and by compensating the distance dependency in the measurement signal based on the ascertained distance.

Abstract: A measurement head (1) for a magnetoelastic sensor having a ferrite core (3). The core (3) has a first end (5), on which a field coil (9) which generates a magnetic field is fitted, and at least a second end (7), on which a magnetic field sensor (11, 41) is fitted.

Abstract: A magnetoelastic torque sensor (1) has an emission coil (7) for generating a magnetic field in an object (3), the torque of which is to be determined. The emission coil is axially oriented (A) and has an axial emission coil end surface (15) which can be guided towards the object (3). At least two reception coils (9, 33, 43) at a distance from the emission coil and having, respectively, a receiving coil end surface (17) which can be guided towards the object (3) to capture a response signal induced in the object (3) by the magnetic field of the emission coil (7, 31, 41). At least the receiver coil end surface (17) of one of the receiver coils protrudes beyond the emission coil end surface (15) to a selected distance from the object (3).

Abstract: A torque sensor arrangement including a contactless torque sensor, in which the torque sensor is arranged on an electrically operating linear carriage is provided. A distance sensor is also arranged on the linear carriage such that it allows the distance to the object of which the torque is to be determined to be measured.

Abstract: A method and a device detect mechanical changes in a component formed of a ferromagnetic material. The mechanical stress in the component is determined using at least one magnetoelastic sensor.

Abstract: A magneto-elastic force sensor includes a sensor head (1) that has an emitting coil (9) which generates a magnetic field and at least one magnetic field sensor (11) for measuring a magnetic flux caused by the magnetic field of the emitting coil (9) in a measured object (13). The sensor head (1) also includes a recorder (14) for recording an electrical value that reflects the inductivity of the emitting coil (9) or that is clearly connected to the latter. The magneto-elastic force sensor allows for compensation of a distance dependency in the measurement signal by ascertaining the distance between the emitting coil (9) or the sensor head (1) and the measured object (13) based on the recorded electrical value and by compensating the distance dependency in the measurement signal based on the ascertained distance.

Abstract: A torque sensor arrangement including a contactless torque sensor, in which the torque sensor is arranged on an electrically operating linear carriage is provided. A distance sensor is also arranged on the linear carriage such that it allows the distance to the object of which the torque is to be determined to be measured.

Abstract: A method for determining the rotational speed of ferromagnetic disks via the detection of permeability changes in dependence on radially directed forces in the disk includes orienting, for the measurement, at least one contactless-operating magneto-elastic sensor toward a face of the ferromagnetic disk to be measured, for detecting permeability changes in the case of occurring radial forces, and for calculating the radial forces from the permeability changes. The primary use is in the field of contactless determining data of rotating components.

Abstract: A measurement head (1) for a magnetoelastic sensor having a ferrite core (3). The core (3) has a first end (5), on which a field coil (9) which generates a magnetic field is fitted, and at least a second end (7), on which a magnetic field sensor (11, 41) is fitted.

Abstract: In a method for monitoring gearwheels during operation using at least one magneto-elastic sensor, which measures without making contact, changes in permeability when mechanical stresses are present in the gearwheel are recorded, wherein the positioning of the at least one magneto-elastic sensor (1) on the gearwheel to be monitored is such that said sensor measures the gearwheel in the region where high stresses occur and forces can be determined by measuring changes in permeability. The method can be used for contactless determination of data on gearwheels.

Abstract: A method for investigating a magnetic workpiece (2) comprises the following steps:—measuring internal mechanical stresses on the workpiece (2) without a load;—measuring internal mechanical stresses on the workpiece (2) with a load;—setting up a calibrating function (7) by means of the two measurements for at least one measuring point;—measuring an externally introduced mechanical stress at the at least one measuring point while taking into consideration the calibrating function (7).

Abstract: A magnetoelastic torque sensor (1) has an emission coil (7) for generating a magnetic field in an object (3), the torque of which is to be determined. The emission coil is axially oriented (A) and has an axial emission coil end surface (15) which can be guided towards the object (3). At least two reception coils (9, 33, 43) at a distance from the emission coil and having, respectively, a receiving coil end surface (17) which can be guided towards the object (3) to capture a response signal induced in the object (3) by the magnetic field of the emission coil (7, 31, 41). At least the receiver coil end surface (17) of one of the receiver coils protrudes beyond the emission coil end surface (15) to a selected distance from the object (3).

Abstract: At least one non-stationary coil in a magnetic resonance tomography system is attached with a fastener to a displaceable bed. The fastener has a position detector incorporated therein to determine the position or a component of the position of the non-stationary coil. The portion of the position is, for example, the position along the axis of symmetry of the measurement tube.

Abstract: A damping system for damping torsion vibrations of shafts in machines is provided. A torque sensor detects torsion vibrations. A magnetostrictive actuator device creates a mechanical counter-vibration and a control device registers a measurement signal of the torque sensor in a time-resolved manner and creates a phase-shifted signal for a counter-vibration and drives the actuator device. Further, a method for eliminating torsion vibration of shafts in machines with such a damping system is provided. The torsion vibration of the torque of the shaft is registered in a time-resolved manner, a phase-shifted signal is created for a counter-vibration, and a mechanical counter-vibration is created using at a magnetostrictive actuator device.

Abstract: A cartridge provides reagents for a biosensor system. The cartridge has at least two containers, the upper sides of which are each sealed by a foil in an airtight and waterproof manner. The at least two containers have sloped bases, the slopes of which are aligned identically. The cartridge can be coupled to a biosensor system in that a hollow needle which is fixed at the sensor system extends through the foil of the at least one of the at least two containers in a coupled state. The end of the hollow needle is positioned in the vicinity of the base of the corresponding container. A drying agent for the water-free storage or for the ventilation of reagents is provided in the cartridge.

Abstract: A damping system for damping torsion vibrations of shafts in machines is provided. A torque sensor detects torsion vibrations. At least one magnetostrictive actuator device creates a mechanical counter-vibration and a control device registers a measurement signal of the torque sensor in a time-resolved manner and creates a phase-shifted signal for a counter-vibration and drives the actuator device. Further, a method for eliminating torsion vibration of shafts in machines with such a damping system is provided. The torsion vibration of the torque of the shaft is registered in a time-resolved manner, a phase-shifted signal is created for a counter-vibration, and a mechanical counter-vibration is created using at least one magnetostrictive actuator device.

Abstract: At least one non-stationary coil in a magnetic resonance tomography system is attached with a fastener to a displaceable bed. The fastener has a position detector incorporated therein to determine the position or a component of the position of the non-stationary coil. The portion of the position is, for example, the position along the axis of symmetry of the measurement tube.

Abstract: A transducer arrangement for a nondestructive ultrasonic material testing system has a multiplicity of ultrasound transducers which can be moved linearly or swiveled along a trajectory curve. A multiplicity of ultrasound transducers can be aligned with a point of a specimen. If the size and the focal length of the transducers prohibit an annular or similar arrangement, the transducers are divided into smaller groups. They are then arranged so that every transducer passes over each desired focal point on the specimen during movement of the transducers along the trajectory curve.