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Patent

Torsional sonic wire delay line

02 Apr 1962-
About: The article was published on 1962-04-02. It has received 9 citations till now. The article focuses on the topics: Line (text file).
Citations
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Patent
08 Dec 1989
TL;DR: A magnetostrictive linear displacement detector with increased position resolution was proposed in this paper, where the displacement is determined from the interval of time between the detection of the torsional motion traveling directly from the magnet and the detection reflected from the reflection termination.
Abstract: A magnetostrictive linear displacement detector with increased position resolution includes a magnetostrictive wire anchored at opposite head and foot ends with a reflection termination at the foot end and a damping termination at the head end. A return wire is connected to the foot end of the magnetostrictive wire. The magnetostrictive wire is electrically excited at its head end. A variable position to be detected is represented by a magnet disposed for displacement along the magnetostrictive wire. A torsional motion sensor at the head end generates an electrical indication of the torsional motion within the magnetostrictive wire induced by passage of the electrical excitation by the position of the magnet. The displacement is determined from the interval of time between the detection of the torsional motion traveling directly from the magnet and the detection of the torsional motion reflected from the reflection termination. The reflection termination preferably consists of a brass cylindrical torus having a hole through which said magnetostrictive wire is passed and attached via a set screw. In an alternative embodiment the magnetostrictive wire is torsionally excited and the responses are detected electrically.

44 citations

Patent
19 Jun 1990
TL;DR: In this paper, a combined magnetostrictive linear displacement detector and a plural location temperature detector are used to produce a composite signal for transmission on a 2 wire transmission line, where the resistances of the temperature sensitive resistors as well as two reference resistors are measured in a predetermined sequence.
Abstract: The present invention is a combined magnetostrictive linear displacement detector and plural location temperature detector. The combined apparatus produces a composite signal for transmission on a 2 wire transmission line. The resistances of the temperature sensitive resistors as well as two reference resistors are measured in a predetermined sequence. The linear displacement is measured by the length of time required for a torsional strain to travel along the magnetostrictive wire to the position of the magnet. A pulse generator generates a predetermined number of pulses for each resistance measurement having pulse period corresponding to the measured resistance, with the minimum such pulse period preferably being greater than twice the maximum time required for a torsional strain to propagate the length of the magnetostrictive wire. An electrical signal is supplied to the transmission line when either said pulse generator generates a pulse or the induced electrical signal is detected. The time between the pairs of pulses indicates the linear displacement fixed by the magnet. The time between pulse pairs is a measure of one of the resistances. The combined apparatus of the present invention also periodically degausses the magneteostrictive wire at a time when no displacement measurement is taking place.

35 citations

Patent
08 Jul 1985
TL;DR: In this paper, a method of time domain noise rejection in a sonic transducer is disclosed in which all signal reception is prevented between application of a periodic electrical pulse and reception of the corresponding electrical signal.
Abstract: A method of time domain noise rejection in a sonic transducer is disclosed in which all signal reception is prevented between application of a periodic electrical pulse and reception of the corresponding electrical signal. An inhibit signal, produced for a substantial portion of the time interval between application of an electrical pulse and reception of the corresponding electrical return signal, blocks all noise that may occur to provide a false indication of a return electrical signal during the time of the inhibit signal.

34 citations

Patent
Page Enno H1
26 Oct 1978
TL;DR: In this article, a waveguide near the hydraulic piston is used to generate a sonic energy pulse, which propagates along the waveguide to a transducer at the cylinder wall, and the time required for this pulse propagation corresponds to the position of the piston and hence of the injection ram.
Abstract: In a casting machine using an injection ram, the ram movements are measured accurately and reliably in spite of adverse ambient conditions by a special sensing arrangement located inside the hydraulic drive cylinder which drives the ram. A sonic energy pulse is generated in a waveguide near the hydraulic piston. This pulse propagates along the waveguide to a transducer at the cylinder wall. The time required for this pulse propagation corresponds to the position of the piston and hence of the injection ram.

13 citations

Patent
15 Jun 1984
TL;DR: A caliper tool for measuring internal dimensions of an enclosure with the tool including a housing of a size to fit within the disclosure and several feeler arms attached in a rotatable fashion to the tool housing with each feeler arm extending outwardly from the tool house to engage the interior surface of the enclosure.
Abstract: A caliper tool for measuring internal dimensions of an enclosure with the tool including a housing of a size to fit within the disclosure and several feeler arms attached in a rotatable fashion to the tool housing with each feeler arm extending outwardly from the tool housing to engage the interior surface of the enclosure. A control apparatus is provided and attached to the tool housing for controlling the location of the tool housing within the enclosure. A mechanical apparatus contained within the tool housing is attached to the feeler arms and provides a translation of the rotational positions of the feeler arms into linearly displaced positions. Magnetostrictive linear displacement transducers are connected to the mechanical means to convert the linear displacement positions into electrical signals representing these positions. Interface circuitry located external to the enclosure is connected to the control apparatus and the transducer for providing input signals to and for receiving output signals from the transducer and further to display the output signals as a visible display of the internal dimensions of the enclosure.

10 citations

References
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Patent
25 Jun 1952

20 citations

Patent
15 Dec 1951

17 citations

Patent
21 Feb 1957
TL;DR: In this paper, a delay rod is used to move pick-up coils along a magnetostrictive delay rod in accordance with modulation signals applied to them, the coils receiving pulses from a transmitting coil 11 at the other end, and applying their combined and variably delayed outputs to a radio transmitter or line along with an equally-spaced synchronizing pulse train.
Abstract: 865,925. Telemetering systems. BYFORD LABS Inc. Dec. 2, 1958, No. 38766/58. Class 40 (1). [Also in Group XL (c)] Time-modulated pulses are produced by variably positioning pick-up coils 40, 46, 50, 54, 56 along a magnetostrictive delay rod 16 in accordance with modulation signals applied to them, the coils receiving pulses from a transmitting coil 11 at the other end, and applying their combined and variably delayed outputs to a radio transmitter or line along with an equallyspaced synchronizing pulse train. The coils may be movedby mechanical connection with coils 41, 47 movable against spring action in the field of permanent magnets 44, 48 by modulation current traversing them, or may be responsive via an aneroid capsule 53 or bi-metallic strip 55 or pressure-responsive piston 57 to signal pressure or temperature. End weights 17, 18 prevent reflections from the ends of the rod. The rod may be replaced by a ribbon or plurality of wires. Alternatively the coils may be coupled to a moving coil longitudinally movable in a pot magnet variably energized by modulation current, all being coaxially mounted on the rod. In a modification the pick-up coil is fixed to the rod and the transmit coil 11 is movable and attached to a moving-coil in a modulation energized electromagnet, and is mounted coaxial with but just off the line, so that only the positive or negative half-cycles of a modulating wave are transmitted, and during absence of modulation no pulses are transmitted. In a further modification the transmitting coil is connected to one end of the rod and both it and the rod are axially moved by modulation relative to a stationary pick-up coil.

13 citations