Micro-Epsilon Messtechnik Gmbh & Co. Kg

Siemens Aktiengesellschaft

Buhler Ag

Micro-Epsion Messtechnic Gmbh & Co. Kg

Felix Mednikov

Martin Sellen

Karl Wisspeintner

Christian Pfaffinger

Roland Mandl

Ulrich Kleine

Johann Hofer

Falk Roewer

Klaus Salzwedel

Werner Grömmer

Benno Weis

Robert Schmid

Reinhold Hoenicka

Mark Netschaewsky

Guenter Schallmoser

Thomas Wisspeintner

Günter Schallmoser

Josef Nagl

Vladislav Mednikov

Walter Uhlmann

Mark Nechaewskij

Stanislav Medinkov

Mark Netchaewskij

G&uuml;nter Schallmoser

Stanislav Mednikov

Werner Groemmer

Mark Netschaevsky

Mark Nechaevsky

Eduard Huber

A sensor arrangement for determining a position and/or a change in the position of a measurement object is described, wherein the sensor arrangement has a magnet and a magnetic field sensor which can be moved relative to one another in a direction of movement. The magnet generates a magnetic field. Movements of the magnet and of the measurement object or movements of the magnetic field sensor and of the measurement object are coupled. To achieve the greatest possible measurement range with a characteristic curve which is as linear as possible at the same time, the sensor arrangement comprises a rod-shaped body which is made from a ferromagnetic material and has a considerably larger dimension in the longitudinal direction than in the transverse direction. A relative movement takes place between the rod-shaped body and the magnet, wherein the rod-shaped body can be connected to the magnet. The magnetic field from the magnet is at least partially directed in the direction of the magnetic field sensor. In this case, the rod-shaped body is arranged parallel to the direction of movement. The magnetic field sensor is arranged on a longitudinal side of the rod-shaped body and is configured to generate a measurement signal from a portion of the magnetic field which emerges from the rod-shaped body at the magnetic field sensor. As a result, the position and/or change in the position of the measurement object can be determined from the measurement signal.

Sensor arrangement and method for determining a position and/or a change in the position of a measurement object

A method for detecting magnetic fields, particularly for detecting the position of objects with a preferably oblong, soft-magnetic element, which is connected to electronics, with via the electronics the impedance of the soft-magnetic material is measured, characterized in that a magnetic field is used in which by the position of an object which is located in an arrangement with the soft-magnetic material the magnetic field develops at the location of the soft-magnetic material, with the magnetic permeability &#x3bc; of the soft-magnetic material adjusting, depending on the magnetic field and thus the position of the object. A respective device serves for applying the method according to the invention.

Method and apparatus for sensing magnetic fields

A circuit system for evaluating a sensor, wherein the circuit system comprises two complex impedances (), wherein the complex impedances () are each part of a resonant circuit in which the complex impedances () can be excited to perform oscillations, and wherein at least one of the two complex impedances () are part of the sensor, is characterized with respect to a particularly cost-effective and as simple a circuit design as possible in that a counter () and a switch apparatus () are provided, wherein the counter () can be used to alternately count the oscillations of one of the two resonant circuits, the switch apparatus () can be switched when a specifiable counter reading has been reached, and the switch signal of the switch apparatus serves as a pulse width-modulated output signal () for the circuit system.

Circuit system and method for evaluating a sensor

In one embodiment, a method for determining the distance of a conducting surface profiled in a direction of distance determination from a functional surface moving relative to the profiled surface is disclosed. The method includes connecting inputs of a sensor to an oscillator arrangement. The sensor includes a first and a second measuring coil. The method includes further connecting outputs of the sensor to an analog-to-digital converter via a demodulator unit to obtain first and second digital measured values. The first and second digital measured values correspond to the distance between the profiled surface and the first and second measuring coil of the sensor, respectively. The method further includes connecting an arithmetic unit to the analog converter unit. The second measurement coil is arranged at a known distance from the first measuring coil on the side of the first measuring coil that faces away from the profiled surface. The method finally includes calculating, using the first and second digital measured value and a reference digital value and the fixed distance, a distance measured value giving the distance of the functional surface from the profiled surface. The reference digital value corresponding to the measured value from a reference coil. The reference coil is assigned to the first and second measuring coils and the reference coil is located outside the range of influence of the profiled surface.

Method and system for determining the distance between a profiled surface and a functional surface moving in relation thereto by using measurement coils and a reference coil

A non-contacting position measuring system comprising a sensor that includes a measuring coil which can be energized with alternating current, where the measuring coil comprises at least two voltage taps, an electrically or magnetically conductive object to be measured which is assigned to the sensor, and an evaluation circuit, where the sensor and the object to be measured can be displaced relative to one another in a longitudinal direction of the measuring coil. The position-measuring system presented is formed in such a manner that the object to be measured comprises at least one marking affecting the impedance of the measuring coil between two voltage taps so that the evaluation circuit provides an output signal correlating with the position of the object to be measured in relation to the voltage taps.

Non-contacting position measuring system

A device and method for detecting the position and velocity of a test object relative to a sensor, the sensor and the test object being arranged such that they can be displaced relative to one another. In one embodiment, the sensor has a measuring coil with one or more voltage tap(s) and has a target that is placed on the test object while being electromagnetically coupled to the measuring coil. An electronic component for adding the voltages tapped on the sensor is assigned to the sensor. The invention is, with regard to a simplest possible design of the sensor, characterized in that for simultaneously measuring position and velocity, the target comprises two parts, one part being made of an electrically conductive material and the other part being provided in the form of a magnet, and in that an evaluation circuit determines, based on the output signal of the electronic component for adding the tapped voltages, a voltage component Uthat is proportional to the position of the target, and a voltage component Uthat is proportional to the velocity of the target.

Device and method for detecting the position and the velocity of a test object

A method and a device for determining motion parameters of a conductive, profiled surface () relative to a sensor (), with the sensor () comprising at least one coil for generating an electromagnetic alternating field, which is subjected, because of the feedback resulting from position changes between the surface () and the sensor (), to a variation, which is determined by means of the coil (). The position change is derived from the coupling impedance (Z) of the coil (), and the real component (R) and the imaginary component (X) of the complex coupling impedance (Z) of the coil () are determined, with a distance d between the sensor () and the surface () being computed based on the determined values while using an algorithm as a basis.

Method and device for determining motion parameters of a conductive, profiled surface

A circuit for measuring distances and which has at least two inputs (), at least one measuring coil (), and at least one signal source, wherein at least two input signals (e, e) are generated by means of the signal source, and the inputs () are activatable by means of the input signals (e, e). The input signals (e, e) are applied, preferably preprocessed, to the inputs of the measuring coil (). The circuit is designed for use where little space is available for the circuit, with the input signals (e, e) being applied to a preferably timed SC network, which generates a measuring output signal that is dependent on temperature. A corresponding method is also described.

Circuit and method for measuring distances

A circuit and method for demodulating at least one modulated signal (e), such as a measuring signal of a sensor. The circuit comprises at least one input (), with the signal (e) being applied to the input (), and the input is connected to at least one switched-capacitor network which is configured to demodulate the signal. The circuit permits use even in a small available space.

Demodulation circuit

A circuit arrangement () for activating a sensor and evaluating its signals, in particular for parametric sensors with complex impedances. The circuit arrangement comprises at least one sensor () for acquiring mechanical data. In order to minimize or largely prevent temperature caused disturbances in a constructionally simple layout, the measuring signal, the absolute temperature, and the gradient temperature of the sensor () are acquired simultaneously, preferably by means of a microprocessor or microcomputer (). A corresponding method for activating sensors and evaluating their signals is also described.

Circuit arrangement and method for controlling and evaluating signal detectors

A device and a method for detecting the position of an object ( ), such as an armature ( ) of an inlet or outlet valve ( ), with the device comprising at least two coils ( ), preferably two magnet coils, which can be energized for moving the object ( ) between the two coils ( ), or used with an evaluation circuit for detecting the position of the object ( ). The two coils ( ) are alternately used for moving the object ( ) between the coils ( ) and for detecting the position of the object ( ).

Device and method for detecting the position of an object

A method for operating an eddy current sensor ( ) with a measuring coil ( ) and an evaluation circuit ( ) for determining material or geometric parameters of a test object ( ), in which the test object ( ) is arranged at a distance (d) from the measuring coil ( ). The impedance of the measuring coil ( ) is evaluated, while the measuring coil ( ) is being supplied with an alternating voltage of a predetermined frequency, and the evaluation circuit ( ) determines the material and geometric parameters of the test object ( ) based on the impedance of the measuring coil ( ). The impedance of the measuring coil ( ) is determined at an alternating voltage of a first frequency, and the impedance of the measuring coil ( ) is determined at an alternating voltage of a second frequency, and the evaluation circuit ( ) computes the material and geometric parameters of the test object ( ) on the basis of the impedances of the measuring coil ( ) at the first and the second frequencies. An eddy current sensor ( ) is also disclosed, which can be used with advantage in conjunction with the method.

Eddy current sensor for analyzing a test object and method of operating same

Eddy current sensor with an exploring coil ( ) wound on a coil form ( ), with two terminals ( ), a source of ac voltage, an electrically conductive measuring probe ( ), and an evaluation circuit, wherein the measuring probe ( ) is displaceable relative to the exploring coil ( ), and the evaluation circuit generates an evaluation signal as a function of the position of the measuring probe ( ), wherein the eddy current sensor comprises an electrode ( ) with a tap ( ) for enabling electrical contact, the electrode forming together with the windings of the exploring coil ( ) and an intermediate layer ( ) a component with distributed electromagnetic parameters, whose output signals are used to determine the position of the measuring probe ( ).

Eddy current sensor

An eddy current sensor (,) has at least one measuring coil (,) that can be supplied with an alternating current, and an evaluation circuit (,). The eddy current sensor allows the temperature influences on the impedance of the measuring coil to be reliably compensated with a simple design and an evaluation circuit. For this purpose, the eddy current sensor has a compensating coil (,) which can also be supplied with an alternating current and which is arranged closely to the measuring coil, i.e. in thermal contact therewith, in such a way that the electric fields of compensating coil (,) and measuring coil (,) are orthogonal to each other. More particularly, the measuring coil (,) is in an annular form and the compensating coil (,) is wound around the measuring coil in the form of a torus.

A noncontacting displacement sensor (,) is proposed with a measuring coil (,) to which alternating current can be applied, the measuring coil (,) having at least two voltage taps (,), with an electrically and/or magnetically conductive measuring object (,), and with an evaluation circuit (,) for evaluating and, if need be, determining an output voltage that corresponds to the position of the measuring object (,) with respect to the voltage taps (,). To provide the displacement sensor of a structural form that is as compact as possible, the measuring object (,) is arranged and displaceable in the interior of the measuring coil (,), the total impedance of the measuring coil (,) being independent of the position of the measuring object (,).

Growing community of inventors

Ortenburg, Germany

Felix Mednikov