Mercedes-benz Aktiengesellschaft

Daimler-benz Ag

Khaldoun Alasafi

Edmund Schiessle

Ralf Gutohrlein

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.

Device for measuring mechanical states of stress in components

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.

Magnetic lauer compositions for use in a device for determining the

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.

Multicomponent acceleration sensor

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.

Temperature sensor

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. The longitudinal dimension of the actuator is compared with a predetermined nominal value in a comparison device and a correcting variable is output by a control device when a difference between the longitudinal dimension of the actuator and the predetermined nominal value is detected by the comparison device. The correcting variable is predetermined in such a manner that the detected difference disappears.

Device for adjusting a nominal value of the dimension of an actuator,

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.

Magnetoelastic force-measuring device

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.

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Schwabisch-Gmund, Germany

Khaldoun Alasafi