Abstract:
A force measurement device comprises a flux concentrator (100) with a first, a second, a third, and a fourth pole, a magnetic field generating unit (200) configured to generate a magnetic field (2) for being applied to a test object (5), and a magnetic field sensing unit (300) with a first, a second, a third, and a fourth magnetic field sensor. The flux concentrator (100) is arranged such that each of its poles concentrates the magnetic field generated by the magnetic field generating unit (200). The first, second, third, and fourth pole are arranged such that they form a quadrangle. A first recess (160) is provided such that the first pole (110) is spaced apart from the second pole (120) and the third pole (130) is spaced apart from the fourth pole (140). A second recess (170) is provided such that the first pole (110) is spaced apart from the third pole (130) and the second pole (120) is spaced apart from the fourth pole (140). Magnetic field sensors are arranged opposite to each other with the flux concentrator (100) in between and such that the first magnetic field sensor (310) and the third magnetic field sensor (330) both face the first recess (160) and the second magnetic field sensor (320) and the fourth magnetic field sensor (340) both face the second recess (170). The magnetic field sensing unit is configured to provide a signal as an indicator for a force applied to the test object (5).
Abstract:
The invention relates to a system (10) for determining a force applied to a cell or tissue culture (14) arranged in a culture chamber (12), comprising an elastic element (30) mounted in or suitable for mounting in said culture chamber (12), said elastic element (30) being adapted to be coupled with said cell or tissue culture (14) such that a force applied to said cell or tissue culture (14) leads to a deflection of said elastic element (30) against a restoring force thereof, and said elastic element comprising a magnetic element (34) arranged such as to be moved upon deflection of said elastic element (30), a magnetic field sensor (42) mounted or suitable for mounting outside said culture chamber (12), said magnetic field sensor (42), when mounted outside said culture chamber (12), being adapted to detect a change of magnetic field attributable to a corresponding movement of said magnetic element (34) upon deflection of said elastic element (30).
Abstract:
Sensor device for measuring forces applied to an object to be sensed with the sensor (1) having a magnetic field generating element (50), a magnetic field sensing element (10), a driving unit (200) being adapted to drive the magnetic field generating element (50) with a first and second driving signal having a first and second frequency, and an evaluation unit (300), the sensor being able of compensating a hysteresis of the object to be sensed.
Abstract:
Es wird ein Bewegungs- und Kraftsensor angegeben, der eine Fassung zur Aufnahme einer Kugel oder Walze sowie eine in der Fassung aufgehängte Kugel oder Walze mit ferromagnetischem Material umfasst, wobei die Kugel oder Walze drehbar aufgehängt ist, der weiterhin wenigstens einen magnetoelastischen Sensorkopf zur Aufnahme der magnetischen Permeabilität der Oberfläche der Kugel oder Walze und eine Auswerteeinrichtung aufweist, ausgestaltet zur Ermittlung einer Drehbewegung der Kugel oder Walze anhand eines Vergleichs der vom Sensorkopf gemessenen Permeabilität mit in der Auswerteeinrichtung gespeicherten Daten zur Permeabilität der Oberfläche der Kugel oder Walze.
Abstract:
An apparatus for measuring material properties of an object of ferromagnetic material comprises a probe (10, 40), the probe comprising an electromagnet core (18, 42) defining two spaced-apart poles (20, 44) for inducing a magnetic field in the object (12), and a drive coil (22, 46) wound around the electromagnet core, and means to supply an alternating electric current to the drive coil to generate an alternating magnetic field in the electromagnet core and consequently in the object. The probe also includes two sensing coils (30, 50) arranged in the vicinity of each of the poles, for sensing the magnetic flux density that links the core and the object. Such sensing coils (30, 50) are significantly more sensitive to changes in material properties than are sensing coils overwound onto the drive coil.
Abstract:
A surface property evaluation device capable of non-destructively and accurately evaluating the surface properties of an object under inspection subjected to heat treatment, nitriding treatment, shot-peening treatment, or the like is provided. The surface property evaluation device 1 of the present invention comprises a magnetic sensor 10 for detecting the magnetic properties of the surface of an object under inspection and outputting a surface property signal, a power supply means 20 for supplying AC power at a predetermined frequency to the magnetic sensor 10; a signal detection means 21 for extracting from a magnetic detection signal a surface property signal in response to the magnetic properties of the surface of an object under inspection; a surface property calculation means 22 for calculating surface properties based on a surface property signal; and a memory means 23 for storing the calibration curve showing the relationship between surface property signals and surface properties and/or reference values obtained in advance using a reference sample of which surface properties are already known. The magnetic sensor 10 comprises a core 11 having a magnetic body, and a coil 12; a closed magnetic path is formed by the magnetic sensor 10 and the surface of the object under inspection.
Abstract:
Contactless speed sensor (1) for measuring a relative speed of an object (2), (3) and the contactless speed sensor (1) the contactless speed sensor having a facing orientation z which facing orientation defines an orientation pointing toward a surface of the object, a magnetic, field generating unit (10), a first magnetic field detector unit (20) having a first magnetic field detector device (21) being adapted for detecting a magnetic field and outputting a first signal being representative for the detected magnetic field, and a second' magnetic field detector device (22) being adapted for detecting a magnetic field and outputting a second signal being representative for the detected magnetic field, an evaluating unit (50) being adapted, for evaluating a signal strength of the first signal and the second signal by comparing the signal strength of first signal and the signal strength of the second signal and determining the speed based on the comparison of the first signal and the second signal.
Abstract:
A load sensor has a sensing unit which includes an excitation coil (2) and a solid rod magnetic body (1) provided along the axis of the excitation coil (2). The magnetic body (1) is magnetized by the excitation coil (2) and a load (P) is exerted on the magnetic body (1) to produce an inductance change from which the load (P) is measured. With this constitution, the construction of the sensor is simplified, a high strength can be obtained, the range of the load is widened, and the size, weight and cost of the sensor can be reduced. Therefore the sensor is easy to handle and portable. Since the load (P) is measured based on the change of inductance caused by the change of permeability of the magnetic body (1), the measurement is free from variation, a high direct feeling and feeling properties can be obtained, the adjustment of the sensor is easy, the hysteresis of the sensor is small, and the measurement is hardly influenced by magnetism.
Abstract:
The invention relates to a device for measuring and/or registering mechanical forces (F) with the aid of a measuring body (1) which can be influenced by the force to be measured. The measuring body is configured with a web (11) in which transverse forces and/or shear stresses occurrent in the web and dependent on the value of the force, can be evaluated with the aid of a magnetizing winding (3) and a sensing winding (4). The web (11) has a limited extension in relation to the measuring body (1) and has a limited thickness (t) such that evaluation of occurrent forces and/or stresses in accordance with magnetoelastic principles will take place substantially in or in the immediate vicinity of a neutral plane (23) located on the measuring body. The invention also relates to a method for the manufacture of such a measuring body.