Abstract: An apparatus and method for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample, in which the sample is provided in an air gap of a magnetically conductive yoke, an alternating magnetic field is generated by an alternating magnetic field strength of an excitation coil in the yoke, and first measurement data relating to the sample are collected using a measuring device which is inductively coupled to the yoke, and comparing the first measurement data to second measurement data relating to a reference sample, wherein the same alternating magnetic field strength or the same alternating magnetic field is applied to both the reference sample and the sample and the difference between the two collected sets of measurement data is included as a measure in the determination of the content for the magnetizable and/or non-magnetizable content portion of the sample.

Abstract: A strain gauge and a metal strip having such a strain gauge, which has a first measuring grid, a second measuring grid, and a substrate on which these two measuring grids are positioned in a common plane. In order to enable achievement of an inexpensive strain gauge whose measurement results can be robustly compensated for in relation to a temperature disturbance variable, it is proposed that the multi-layer substrate have a metallic layer and an electrically insulating layer onto which electrically insulating layer these two measuring grids consisting of a piezoresistive material are printed.

Abstract: A strain gauge and a metal strip having such a strain gauge, which has a first measuring grid, a second measuring grid, and a substrate on which these two measuring grids are positioned in a common plane. In order to enable achievement of an inexpensive strain gauge whose measurement results can be robustly compensated for in relation to a temperature disturbance variable, it is proposed that the multi-layer substrate have a metallic layer and an electrically insulating layer onto which electrically insulating layer these two measuring grids consisting of a piezoresistive material are printed.

Abstract: An apparatus and a method for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample, in which the sample is provided in an air gap of a magnetically conductive yoke, an alternating magnetic field is generated by means of an alternating magnetic field strength of an excitation coil in the yoke, and first measurement data relating to the sample are collected using at least one measuring device which is inductively coupled to the yoke, and the magnetizable and/or non-magnetizable content portion in the sample is determined by comparing the first measurement data to second measurement data relating to a reference sample that has a known magnetizable and/or non-magnetizable content portion, wherein the same alternating magnetic field strength or the same alternating magnetic field is applied to both the reference sample and the sample and the difference between the two collected sets of measurement data is included as a measure in the determination of the

Abstract: A method and an apparatus for the non-contact support of a sensor and/or actuator device with respect to a substrate which reflects sound at least in regions has a moving suspension device, a sensor and/or actuator device which is mechanically connected to the suspension device, and a positioning device which is mechanically connected to the suspension device and which has at least one non-contact bearing for the non-contact support of the sensor and/or actuator device with respect to the substrate. The positioning device has at least one sonotrode for emitting an ultrasonic field which, between the sonotrode and the substrate, forms acoustic levitation waves for the non-contact support of the sensor and/or actuator device with respect to the substrate by a non-contact bearing which is designed as an ultrasonic bearing.

Abstract: A method and an apparatus for the non-contact support of a sensor and/or actuator device with respect to a substrate (2) which reflects sound at least in regions, in particular sheet metal, has a moving suspension device, a sensor and/or actuator device which is mechanically connected to the suspension device, and a positioning device which is mechanically connected to the suspension device and which has at least one non-contact bearing for the non-contact support of the sensor and/or actuator device with respect to the substrate. In order to ensure accurate positioning with respect to the substrate, the positioning device has at least one sonotrode for emitting an ultrasonic field which, between the sonotrode and the substrate, forms acoustic levitation waves for the non-contact support of the sensor and/or actuator device with respect to the substrate by a non-contact bearing which is designed as an ultrasonic bearing.

Abstract: An apparatus and a method for detecting at least one periodically occurring defect on an object, in particular on a metal strip, in which at least one time signal is recorded from the moving object using a measuring method, the time signal is converted into a quality function using a stochastic method and one or more periodic signals in the time signal are inferred on the basis of this quality function in order to thereby detect at least one periodically occurring defect on the object. In order to obtain advantageous method properties, it is proposed to convert the time signal recorded by means of the measuring method, in particular the electromagnetic measuring method, into the quality function using a model-based estimation method, in particular using a maximum likelihood method.