The invention relates to measurement technology and is used to determine the absolute displacements of objects in metallurgy, automotive industry, warehouse and production logistics, and in the automation of production. The technical result is achieved when the following steps are performed: the displacement transducer is mounted on the object; signal sources are mounted along the trajectory of the object displacement; on each section of the trajectory, an arrangement of the signal sources is provided which is determined by changing the number of signal sources and/or the distance between any two signal sources; a signal is sent to the moving object with transducer; an output signal is received from the transducer regarding the location of the signal sources located within the measurement range; the object location is determined; furthermore, the displacement is measured at a distance exceeding the length of the active zone of the transducer.

A manufacturing method of a fluid pressure cylinder includes inserting the sensor rod into a hole extending in the piston rod, holding the sensor body with respect to the piston rod by using a holding member mounted on the piston rod, inserting the piston rod into the cylinder tube, and fixing the sensor body to the cylinder tube by fixing the holding member to the cylinder tube.

A position sensing system is disclosed. The position sensing system may include a hollow sensor body. A magnet may be disposed in the hollow sensor body. The magnet may be movable within the hollow sensor body.

A magnetostrictive path-measuring device is provided, comprising a plurality of measuring sections, each having an extent in a longitudinal direction and being arranged parallel to one another at least in a measuring region, at least one magnetic position indicator which is coupled contactlessly to the measuring sections, a start signal application device by means of which start signals are providable to the measuring sections for the generation of excitation current pulses, and an evaluating device by means of which the position of the position indicator on the measuring sections is determinable by a transit time measurement of mechanical waves, wherein the start signal application device comprises a time control device which directs that in a measuring cycle, start signals are provided to different measuring sections at defined different time points.

The invention relates to measurement technology and is used to determine the absolute displacements of objects in metallurgy, automotive industry, warehouse and production logistics, and in the automation of production. The technical result is achieved when the following steps are performed: the displacement transducer is mounted on the object; signal sources are mounted along the trajectory of the object displacement; on each section of the trajectory, an arrangement of the signal sources is provided which is determined by changing the number of signal sources and/or the distance between any two signal sources; a signal is sent to the moving object with transducer; an output signal is received from the transducer regarding the location of the signal sources located within the measurement range; the object location is determined; furthermore, the displacement is measured at a distance exceeding the length of the active zone of the transducer.

A position sensor comprises a waveguide of magnetostrictive material which extends along a measurement path and which is configured for conducting mechanical pulses triggered by magnetostriction. A transducer at a first end of the waveguide serves for coupling a current pulse into the waveguide and for detecting a mechanical pulse conducted by the waveguide in the direction of the transducer. A damping element of an elastomer material is provided at a second end of the waveguide for damping a mechanical pulse propagating in the direction of the second end, wherein the hardness of the elastomer material increases as the distance from the transducer increases. The invention furthermore relates to a method of manufacturing a damping element of such a position sensor.

A position sensor comprises a waveguide of a magnetostrictive material, which extends along a measurement path and which is configured for conducting mechanical pulses triggered by magnetostriction, and a housing for the waveguide. A positioning element is provided which is elastic at least regionally; which is held in the housing while being deformed; and which has a recess which extends along the measurement path and forms a receiver for the waveguide. In the position sensor in accordance with the invention, the recess has a slit which extends along the measurement path; which, viewed in a cross-sectional plane, reaches from a reception section up to a boundary of the positioning element; and which enables a lateral insertion of the waveguide into the reception section. The invention furthermore comprises a method of manufacturing a position sensor in accordance with the invention.

A magnetostrictive displacement measuring apparatus is proposed, comprising at least one measuring probe which is of flexurally flexible configuration and comprises a waveguide, and comprising a magnetic position marker which couples to the at least one measuring probe in a non-contact manner, wherein the waveguide is supported in an elastic, flexible support tube and the flexible support tube is positioned in a carrier tube, wherein the flexible support tube is, on an outer side thereof, provided with indentations facing the carrier tube and wherein material of the carrier tube is arranged in the indentations.

An apparatus for determining the position of an object having one or more magnetic elements. The apparatus includes magnetostrictive optical sensors, each arranged to produce a signal which is indicative of a proximity of the sensor to the one or more magnetic elements. The apparatus is arranged to determine the position of the object based on a plurality of such proximity signals.

This disclosure relates to the inspection of train wheels while mounted on a train that is moving on a railroad track. A magnetostrictive EMAT transducer is built using an RF Coil, a static biasing magnetic field, and a strip of highly magnetostrictive material. This magnetostrictive EMAT transducer is subsequently attached to a rail on the track so the wheel tread of the moving train can contact and apply downward pressure on the magnetostrictive EMAT transducer. A mechanism under the transducer provides enough counterforce to pressure-couple the transducer with the tread of the wheel. Once the transducer is ultrasonically coupled with the wheel, an ultrasonic instrument sends a pulse to the transducer generating a Shear Horizontal wave that travels circumferentially following the tread body. The Shear Horizontal wave generated with this magnetostrictive strip EMAT transducer penetrates deep into the wheel tread and permits detection of both surface and internal defects.