Abstract: A lightweight, battery-operated, voltage-stabilized, bioelectronic and non-invasive measuring apparatus derives the electrical heart potentials using measuring electrodes fixed to the patient and uses electronic numerical evaluation to produce therefrom an electronic risk display for safely diagnosing atrial fibrillation at the earliest possible time in the illness.

Abstract: A lightweight, battery-operated, voltage-stabilized, bioelectronic and non-invasive measuring apparatus derives the electrical heart potentials using measuring electrodes fixed to the patient and uses electronic numerical evaluation to produce therefrom an electronic risk display for safely diagnosing atrial fibrillation at the earliest possible time in the illness.

Abstract: A Sensor for non-contact torque measurement on a shaft and a soft-magnetic, magnetostrictive measurement layer, especially for such a sensor. The sensor contains a measurement layer support having a soft-magnetic and magnetostrictive measurement layer which is a tubular shaft intermediate piece, as well as a measurement coil support having a measurement coil which is opposite the measurement layer. The measurement coil support is fixable on a holder without being supported on the measurement layer support, and that end region of the measurement layer support which faces away from the shaft is essentially in the form of a disc and is constructed such that it extends essentially at right angles to the shaft axis when the measurement layer support is fitted. This sensor, which can be fitted and removed easily, has a short axial structural length.

Abstract: A device for measuring mechanical states of stress in components has a part of the device positively joined to the component whose mechanical states of stress are to be measured. The part of the device undergoes a change in a measurable variable in the event of a change in the mechanical states of stress. The part of the device is a layer which is deposited on the component and which has a layer structure containing less than 8% by weight of phosphorous, preferably up to 3% by weight of phosphorous, up to 2% by weight of an element of main group IV or V, in particular antimony, and up to 5% by weight of a transition metal element, in particular cobalt. The weight percentages resulting from the sum are increased up to 100% with nickel. The layer modifies the magnetic flux in a coil arrangement comprising at least one coil, and the change in the magnetic flux in the coil arrangement is evaluated and the mechanical state of stress of the component are deduced from the change in the magnetic flux.

Abstract: A device for determining the position of an axially movable body wherein the position of the body is deduced from the inductance of a coil arrangement. A layer which has a layer structure containing less than 8% by weight of P, preferably up to 3% by weight of phosphorus, up to 2% by weight of an element of main group IV or V, in particular antimony, and up to 5% by weight of a transition metal element, in particular cobalt, is deposited on the body. The percentages by weight resulting from the sum are increased up to 100% with nickel. An axial movement of the body to which the layer is joined, modifies the magnetic flux in a coil arrangement comprising at least one coil. The changes in inductance resulting therefrom are measured and the position of the body is deduced therefrom.

Abstract: A multicomponent acceleration sensor in which the inertial force of a seismic mass effects a variation in an electromagnetic quantity of a plurality of individual transducers. During acceleration, the seismic mass acts in each individual transducer a magnetoelastic measuring layer, the permeability .mu..sub.r of which influences the inductance of a sensor coil. For each spacial direction in which the acceleration is to be determined, a pair of transducers is mounted on a base member coaxially to, and axially spaced from, each other in such a way that an acceleration of the acceleration sensor perpendicular to the axial direction of the sensor coils of the two individual transducers causes an equidirectional variation in inductances of the sensor coils of the two individual transducers, and a signal representing the acceleration status is obtained in at least one evaluation electronics form the inductances of the sensor coils.

Abstract: A temperature sensor has a body whose thermal expansion is evaluated in the event of a change in temperature, there being deposited on the body a layer which has a layer structure containing less than 8% by weight of phosphorus, preferably containing up to 3% by weight of phosphorus, up to 2% by weight of an element of main group IV or main group V, in particular antimony, and up to 5% by weight of a transition metal element, in particular cobalt. The percentages by weight resulting from the sum being increased up to 100% with nickel. The layer modifies the magnetic flux in a coil arrangement comprising at least one coil. This change in the magnetic flux in the coil arrangement is evaluated and the change in the magnetic flux being detected as a change in the inductance. The change in length of the body and the change in temperature are deduced therefrom.

Abstract: The invention relates to a permanent magnet system with associated coil arrangement, the permanent magnet system consisting of two axially polarized permanent magnet rings which are mounted one behind another in the axial direction, like poles of the permanent magnet rings being opposite one another, the two permanent magnet rings being distanced from one another by a soft magnetic spacing washer, the permanent magnet rings being surrounded on the outside by a coil in such a way that the coil central axis coincides with the central axis of the permanent magnet rings, the center of the coil being located in the normal position of the coil at the level of the soft magnetic spacing washer, at least one coil being located inside the inside diameter of the permanent magnet ring in such a way that the coil central axis of the coils coincides with the central axis of the permanent magnet rings, the center of the coils being located in the normal position of the coils at the level of the soft magnetic spacing washer.

Abstract: The present invention relates to a loudspeaker diaphragm which is provided with a rear load and the vibration characteristic of which is improved in that the work to be performed for compressing the air behind the loudspeaker diaphragm is reduced. For this purpose, the loudspeaker diaphragm is provided with openings so that the air located behind the loudspeaker diaphragm can escape. At the same time, the introduction of the openings causes a decoupling of the vibrating diaphragm parts with respect to the frequency response when the loudspeaker diaphragm and the openings are suitably dimensioned, so that it is predominantly the inner part of the loudspeaker diaphragm which vibrates in the case of high notes, while the entire loudspeaker diaphragm vibrates in the case of low notes.

Abstract: A device for adjusting a nominal value of the dimension of an actuator, the longitudinal dimension of which can be changed by applying an external electromagnetic or electrostatic field, the magnitude of the external electromagnetic or electrostatic field being associated with the longitudinal dimension of the actuator, or soft-magnetic and highly magnetoelastic layer being connected to the actuator in such a manner that a change in length of the actuator produces a change in the mechanical stress in the layer. The change in mechanical stress in the layer produces a change in the value of an inductance, the mechanical stress in the layer being inferred from the magnitude of the inductance in sensor electronics and the longitudinal dimension of the actuator being inferred from the mechanical stress in the layer.

Abstract: A magnetoelastic force-measuring device is proposed which has an annular thrust body possessing magnetostrictive properties and bearing a ring coil. To enhance the measuring sensitivity in conjunction with simultaneous good thermal error compensation, a sleeved tension body, likewise possessing magnetostrictive properties and bearing a ring coil, is arranged coaxially in the annular thrust body to fit in such a way that, given the introduction of a force, the one body is subjected to thrust and the other to tension. In this connection, the magnetostrictive properties are formed by a soft magnetic measuring film--preferably of amorphous metal--which applied in each case to the body, and the two ring coils are connected up to make an inductive half-bridge.

Abstract: A loudspeaker is disclosed with a diaphragm and an annular moving coil fastened to the diaphragm. An annular permanent-magnet system is arranged concentrically relative to the moving coil and is fastened to a support. To obtain a high-power and extremely slim system, the moving coil surrounds the permanent-magnet system with only a small air gap and, on its outer surface, carries a thin-walled annular core of amorphous metal. The permanent-magnet system consists of two permanent-magnet rings spaced from one another by means of a soft-mangetic annular intermediate disc and having like poles facing one another.

Abstract: A device for the contactless indirect electrical measurement of the torque at a shaft utilizing the Matteucci effect in which the shaft is located in an induced magnetic direct-axis field. Upon torsion of the shaft, the change in magnetization in the shaft itself is not measured, but rather a measuring layer applied to the shaft is metrologically detected by the device. In order to avoid disturbing influences from the basic magnetization of the shaft on the measuring layer, a further layer is applied to the shaft, which short-circuits the magnetic flux resulting from the basic magnetization of the shaft, the measuring layer being magnetically decoupled from the inner layer by a highly nonmagnetic layer between the inner, further layer and the measuring layer.

Abstract: A device is provided for the indirect contactless electrical measuring of short distances, particularly for measuring the stroke and/or the position of nozzle needles for injection nozzles of internal combustion engines. A coil having a solid core of a soft-magnetic alloy is used as magnetic field sensor and a low-mass permanent magnet. The permanent magnet is rigidly connected to a moving control element. The nozzle needle is fixed to the control element. Movement of the permanent magnet in relation to the coil causes a change in the magnetic flux density in the core of the coil and, via the nonlinear function B=f(H) of the mangetization curve, effects a change in the dynamic permeability and consequently in the inductance of the coil. The change in inductance of the coil is converted by a suitable electronic evaluating circuit into a path-analogue signal to determine the distance between the fixed coil and the movable permanent magnet.