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Author

Jacob Tellerman

Bio: Jacob Tellerman is an academic researcher. The author has contributed to research in topics: Magnet. The author has an hindex of 1, co-authored 1 publications receiving 153 citations.
Topics: Magnet

Papers
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Patent
19 Dec 1973
TL;DR: In this paper, a linear distance measuring device is disclosed in which the time it takes a torsion pulse to traverse a sonic waveguide from a movable magnet to a pulse responsive element is determined and converted to a measurement of the distance from the movable magnets to the pulse responsive elements.
Abstract: A linear distance measuring device is disclosed in which the time it takes a torsion pulse to traverse a sonic waveguide from a movable magnet to a pulse responsive element is determined and converted to a measurement of the distance from the movable magnet to the pulse responsive element The position of the magnet, which is moved by an external means such as a machine tool element, can thus be determined precisely

153 citations


Cited by
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Patent
02 Jun 2000
TL;DR: In this article, a position feedback system is used to determine the position of movable elements on a path and control the movable element on the path and the programmable controller using positional information from the sensors.
Abstract: The present invention is directed to a machine with a position feedback system and a method for use thereof. The machine includes at least one movable element mounted for movement on a path and at least one programmable controller. The machine further includes at least two absolute or magnetostrictive sensors or the machine includes an absolute sensor and a non-absolute sensor. The programmable controller uses positional information from the sensors to determine the position of the movable elements on the path and control the movable elements. The method includes determining a known position for the movable elements, linking at least two magnetostrictive sensors into one virtual sensor, and/or performing commutation alignment for the movable elements. Determining the position and commutation alignment can occur when the movable elements are stationary or moving.

379 citations

PatentDOI
TL;DR: In this paper, a transducer transmits ultrasonic signals from a location fixed within the structure to the device for reflection thereby and for picking up the reflected signals, whereby the different picked up signals reflected from the device and reference target will have a timed relationship corresponding to such fixed distance.
Abstract: An ultrasonic system is responsive to the relative position of a movable device within a fluid-filled structure A transducer transmits ultrasonic signals from a location fixed within the structure to the device for reflection thereby and for picking up the reflected signals A reference target within the fluid, attached either to the structure or the device, also reflects the transmitted ultrasonic signals from also being picked up by the transducer, such reference target being a predetermined fixed distance relative to either the device or the structure, whereby the different picked up signals reflected from the device and reference target will have a timed relationship corresponding to such fixed distance, measurement circuitry means is responsive to the picked up signals reflected from the device and to such timed relationship for providing an output signal which is a function of change in the position of the device within the structure, being includes circuitry responsive to the timed relationship for causing the output signal to be compensated for changes in the velocity of ultrasonic signals in the fluid resulting from changes in parameters thereof subject to causing errors in the output signal The structure is, for example, a fluid cylinder and the movable device is a piston within the cylinder Alternatively, sensing of the parameter is used for output signal compensation

84 citations

Patent
03 Nov 1975
TL;DR: In this paper, a magnetic field generator is mounted on a movable member and an elongated ferromagnetic member is positioned adjacent and parallel to the path of movement of the member.
Abstract: The position of a movable member is measured without the establishment of physical contact with such member. A magnetic field generator, which provides a localized field of special geometry, is mounted on the movable member and an elongated ferromagnetic member is positioned adjacent and parallel to the path of movement of the member. The magnetic field will produce a change in the Young's modulus of elasticity in an adjacent region of the ferromagnetic member and sonic strain pulses launched along the ferromagnetic member will be partly reflected from this region of Young's modulus discontinuity. The time required for a strain pulse to travel from a given point on the ferromagnetic member to the region of Young's modulus discontinuity and be partially reflected therefrom and returned to a known detection point will provide a measure of the position of the field generator along the elongated ferromagnetic member.

75 citations

Patent
24 Jun 1991
TL;DR: In this paper, a method and apparatus for correcting thermally induced errors in the operation of a magnetostrictive linear displacement transducer used to monitor the piston position in a hydraulic cylinder is presented.
Abstract: A method and apparatus for correcting thermally induced errors in the operation of a magnetostrictive linear displacement transducer used to monitor the piston position in a hydraulic cylinder The transducer includes a processing head on one end of the cylinder, a waveguide extending from the processing head and a permanent magnet which encircles the waveguide and travels with the piston Temperature compensation is provided by a washer which is beveled on its outside edge and a pair of rings which are beveled to mate with the bevels on the washer The rings have a lower coefficient of thermal expansion than the washer to effect axial shifting of the magnet when the temperature changes in order to compensate for speed change in the waveguide signals with temperature changes

56 citations

Patent
24 Sep 1987
TL;DR: In this paper, a magnetostrictive wire is used to measure liquid level as a function of the elapsed time between an actuation signal and the first zero crossing of the voltage which is induced as the torsional strain passes through the area of influence of the sliding magnet.
Abstract: A liquid level detector of the type in which a magnetostrictive wire extends through the liquid level measurement range and is captured in a tensioned vertical orientation within a stainless steel tube. Liquid level is measured as a function of the time required for a torsional disturbance imparted the wire near the top to travel along the wire to a magnet which is contained within a liquid level float which slides up and down along the tube. The torsional disturbances imparted to the wire by means of a piezoelectric crystal to which the wire is easily clamped. Accuracy is enhanced by measuring liquid level as a function of the elapsed time between an actuation signal and the first zero crossing of the voltage which is induced as the torsional strain passes through the area of influence of the sliding magnet.

55 citations