US3011136A - Electro-acoustic delay-line - Google Patents

Electro-acoustic delay-line Download PDF

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US3011136A
US3011136A US836844A US83684459A US3011136A US 3011136 A US3011136 A US 3011136A US 836844 A US836844 A US 836844A US 83684459 A US83684459 A US 83684459A US 3011136 A US3011136 A US 3011136A
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wire
delay
transducer
waves
line
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Scarrott Gordon George
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Ferranti International PLC
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Ferranti PLC
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
    • H03H9/133—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials for electromechanical delay lines or filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • FIG. 1 A first figure.
  • Such a delay-line usually consists of an elongated conductor of longitudinal stress-waves in the form of a wire at each end of which is an electro-acoustic stress-wave transducer for thek inputv and output pulses respectively.
  • the term wire should be understood to include a rod or the like and the term delay-line to include the combination of the wire and the input and output transducers.
  • the input transducer is usually designed toset up a longitudinal stress-wave in the Wire in response to energisation by an electric input pulse.
  • the output transducer is designed to supply the electric output pulse in response to energisation by the stress-wave set up by the input transducer after the interval occupied by the wave in travelling from one transducer to the other.
  • a well-known type of input transducer for this purpose consists of the combination of a coil surrounding a short length of wire of magnetostrictive material, such as nickel, which also serves as part of the stress-Wave conductor. Energisation of this coil effects a local distortion of that part of the wire in the field of the coil in the usual magnetostrictive manner and this in turn sets up a longitudinal lstress-wave in the wire.
  • 'I'he corresponding output transducer may be a similar combination of coil -and magnetostrictive wire, with the addition of a permanent magnet or other means for setting up a field through the coil.
  • the presence of the received stress-wave in that part of the wire in the lield causes a change of the flux linking the coil and so induces an output pulse.
  • the input transducer with a magnet or the like to polarise it by setting up a constant afield through the coil; the steepest part ofthe magnetic characteristic of the wire may thus be brought into use.
  • a disadvantage of the above arrangements is that unless the wire is straight the longitudinal stress-waves are subjected to appreciable dispersion, which at any point on the wire is inversely proportional to the square of the radius to which the wire is bent -at that point.
  • An object of the present invention is to provide an acoustic delay-line which is cheap and simple to manufacture, robust in construction, reliable in operation and substantially insensitive to temperature changes.
  • Another object is to provide a delay-line which is capable of undistorted transmission of pulse signals with a predetermined delay which is constant for allfrequencies within a relatively wide band.
  • a further object is to provide an acousticgdelay-line particularly suitable for digital storage purposes which is of curved form rather than straight but in which the Stress-waves are not subjected to appreciable dispersion, thereby affording the maximum storage capacity in a lgiven space.
  • Still another object is the provision of an electroacoustic delay-line wherein the electric input pulses are converted into torsional stress-waves inthe wire of the line and said stress-waves are in turn converted at the out- .-7
  • an electrov acoustic delay-line comprises a wire for propagating torsional stress-waves, an input torsional stress-wave transducer s and an output torsional stress-wave transducer located at diiferent axial positions' on the wire, each of which transducers includes a plurality of elongated mem- .bers of magnetostrictive material secured to the wire to extend tangentially from areas of contact which in that converter are located at vthe same axial position on the wire and are spaced around it at equal angular distances, the inputs transducer .including also electromagnetic means for setting up longitudinal stress-waves in the said members thereof, means for electrically pulse-energising said electromagnetic means to cause longitudinal stresswavesto reach the wire simultaneously in the same peripheral direction from each said member of the input transducer, .thereby setting up in the wire a torsional stress-wave travelling to the output transducer, the output transducer including also electromagnetic means for responding electrically to longitudinally stress-wave
  • naturallystraight wire means a wire which when unconstrainedtakes Aup a ,configuration which is either absolutely straight, or so ⁇ nearly so thatthe resulting small dispersion of torsional waves. is negligible from the standpoint of pulse distortion, and which must be continuously restrained when disposed in a curved contiguration.
  • dispersion Although an appreciable amount of dispersion may be tolerable in some delay-line installations, it is generally undesirable because dispersion broadens the pulses put into the line and may cause overlapping of the output pulses to such an extent that they lose their identities and cannot be distinguished from one another.
  • the low dispersion characteristic of delaylines embodying the present invention is therefore advantageous in increasing the storage capacity of the line.
  • the electromagnetic means of this transducer may include means ⁇ for polarising at least one of the members so that the longitudinal stress-waves which travel to the Wire from these members are in opposite sense'sand so reach the wire in the same peripheral direction.
  • FIG. 1 is a schematic diagram of a delay-line in accordance with the invention.
  • FIGURESZ yand 3 are simplified diagrams of input and output torsional stress-wave transducers suitable for the delay-line of FIGURE l; v
  • FIGURE 4 shows a modied form of the delay-line of FIGURE l
  • FIGURES 5 and 6 show alternative forms of torsional stress-wave transducers
  • ⁇ FIGURE 7 is a plan view of one structural form of delay-line embodying Vthe invention with the case cover removed;
  • FlGURE 8 is an end elevation of the delay-line of FIGURE 7 looking from the right in the latter ligure with the end wall of the case broken away;
  • FIGURE 9 is an enlarged cross-sectional View of the input transducer taken substantially on the line 9 9 in .FlGURE 7;
  • FIGURES 10 and l1 are an enlarged plan view and side elevation, respectively, of the input transducer subassembly of the delay-line of FIGURE 7, FIGURE ll being partially in section along the line 11-11 in FIG- URE l0; and
  • FIGURE l2 is an enlarged cross-sectional view taken substantially on the line 12--12 in FIGURE 7 showing one of the supporting brackets by which the delay-line wire is maintained in the desired curved configuration.
  • an electro-acoustic delay-line consists of a length of a naturally straight wire 11 of uniform diameter (see FIG. l) made of an alloy capable of low loss propagation of torsional stress-waves and having a low temperature coeiiicient of time delay, i.e., not more than about iSXlO-G per degree centigrade, at the ends of which wire are located the input and output torsional stress-wave transducers A and B respectively.
  • Nickel-iron-titanium alloy and Ni-Span C are examples of alloys that may be used for the wire 11.
  • the input transducer is shown in detail in FIG. 2, the wire 11 being depicted end-on with a diameter much exaggerated for clarity.
  • the transducer includes two elongated members of magnetostrictive material in the form of two like nickle strips 12 of rectangular cross section welded to extend tangentially from areas of cOntact at the surface of the wire which are spaced around the wire at equal angular distances; that is to say, the areas of contact are diametrically opposite one another. These areas are located at the sameaxial position on the wire; that is to say, the centres of the two areas lie in the same radial plane.
  • the area of contact of each fstrip is located near one end of the strip on the broader surface thereof, this surface being parallel to the axis ⁇ of the wire, and the two strips extend from the wire in l'opposite directions.
  • the input transducer also includes electromagnetic means for setting up longitudinal stress-waves in the 'strips 12, in the form of a coil 13 carried by each strip ⁇
  • the two coils 13 are alike and are located at equal distances from the wire; they are connected in series or parallel t0 an apparatus 14- for simultaneous pulseienergization.
  • the output transducer is shown in FIG. 3, the wire 11 being again depicted end-on.
  • This transducer is similar to -the input transducer, having nickel strips 15 extending 'tangentially from the wire and carrying coils 16, with Vthe addition for each coil of a permanent magnet 17 arranged to set up a field passing axially through the coil.
  • the coils are electrically connected, in series or -parallel with one another, to the apparatus 18 to which Vthe output pulse is to be delivered.
  • the combination 4of coils 16 and magnets 17 constitute electromagnetic means for responding electrically to longitudinal stresswaves in the strips 15.
  • each input pulse delivered by apparatus 14 to coils 13 causes the metal of each strip 12 to contract in known magnetostrictive mannerk and so sets up in the strip a longitudinal stress-wave travelling towards the wire.
  • longitudinal stress-waves of equal intensity reach the wire synchronously at diametrically opposite points but in the same peripheral direction. The effect is to produce in the wire a torsional stress-wave travelling towards the output transducer.
  • each coil 16 is thereby energised in the manner, described above, appropriate to known delay-lines using longitudinal waves, the energisation being synchronous because of the equal distances of the coils from the wire. An output pulse is thus developed.
  • the resulting torsional stress-wave in the wire and the electric output pulse delivered to apparatus 18 would be proportionately inaccurate.
  • the two longitudinal stress-waves set up in the input transducer were displaced in time by an amount equal to the width of the input pulse, the resulting torsional stress-wave and output pulse would be twice the original width, an obviously intolerable condition for ldelaydine operation.
  • the resulting action on the wire would not be a purely torsional couple, but would contain a transverse wave component which would be propagated along the wire at a dilferent speed from the torsional component and would result in a spurious pulse arriving at the output transducer at a different time from the main torsional pulse.
  • a match is attained where the dimensions and characteristics of these components are such as to satisfy the expression where A and r are the sectional area of each strip and the radius of the wire, respectively, to the same dimensions, G1 is the shear modulus and W1 the density of the wire, E2 is the Youngs modulus and W2 the density 0f the strips, and n is the number of strips.
  • Each strip -12 of the input transducer may also be polarised, either by a permanent magnet 19 as indicated in FIG. 2, or by a direct current through the coil, to bring the steepest part of the magnet characteristic of the strip into use.
  • a permanent magnet 19 as indicated in FIG. 2
  • a direct current through the coil to bring the steepest part of the magnet characteristic of the strip into use.
  • the strips 12 of the input transducer need not extend in opposite directions from the wire but may extend in the same direction.
  • Such an arrangement is shown in FIG. 5, Where 11 is the wire, Zland 21 are the strips, and 22 and 23 are the coils. ln thiscase one of the coils, say coil 22, must be given a polarising field, as by a permanent magnet 24, of opposite sense to the field set up by the pulse applied to coil 22 so that the magnetostrictive contraction in strip 20 due to magnet 24 is reduced by that pulseinstead of increased.
  • F[he other strip 21 may also be polarised, as indicated in FIG. at 25, to bring the steepest part of the magnetic characteristic of the strip'into use. it is then necessary to apply the pulse to coil 23 so as to increase the magnetostrictive contraction due to magnet 25.
  • Magnet 24 may in fact serve to polarise both strips, it the coils are connected so that the fields set up by them when pulse-energised respectively increase the ⁇ contraction in one strip and decrease it in the other strip.
  • FIG. 5 where both coils are polarised, may be used for an output transducer, provided that the coils are interconnected so thatthe induced voltages do not oppose one another.
  • a transducer may have three or more, provided the areas Vof contact are spaced at equal angular distances'round the wire.
  • the equal anguwire forming the spiralis maintained sufliciently large to prevent yexceeding the elastic limit of the wire. ⁇ For example, to provide a delay of 1000 microseconds for all frequencies within a band-.of approximately i500 kilocycles per Second centered at 1000 kilocycles per secpulses at a repetition rate of l megacycle per second.
  • the coils of the input transducer It is not essential for the coils of the input transducer to be located at equal ⁇ distances from the wire. lr', however, they are not so located, it is necessary to pulseenergise the coils at ⁇ dilerent times, rather than simultaneously, to ensure that the respective longitudinal stresswaves reach the wire at the same time. To effect this, the coil or coils nearer the wire should of course be pulsed later than the other coil or coils.
  • the delay-line shown therein comprises as its principal elements a length of naturally straight'wire 31 coiled in theV form of a flat spiral, an input transducer assembly 32 connected to the end of Wire 31 at the inside of the spiral, and an output transducer assembly 33 connected to the other end of the wire, all of said elements being suitably mounted in a case 34 which is normally provided with a cover (not shown).
  • the Wire 31 is made of a material which is capable of propagating torsional stress-waves with a minimum transmission loss and ywhich has a lofw temperature coeflicient of time delay such that the delay and output waveshape will be substantially independent of temperature changes.
  • a wire made of a constant modulusv wrought nickel alloy, such as Ni-Span C having a uniform diameter of .030 inch, a Youngs modulus of 27x10(i and an elastic limit in bending of 210,000 pounds per square inch.
  • a plurality of supportbrackets 35 are provided in such numbers and positions as to receive and hold the vwire 31 in the desired configuration.
  • each bracket 35 consists of a vhorizontal base 36 which is riveted or otherwise suitably secured to the bottom of case 34, and a vertical ilange 43*] having formed in its upper edge a plurality of laterally spaced slots 38 the bottoms of which are of circular cross section of substantially ⁇ the same size as the wire 31.
  • the brackets 35 are made of an insulating material which yis preferably flexible, such as molded nylon, so
  • each slot 38 may beA made slightly vless than the diameter of wire 31, and yet, by deformation of the material of the llange, the wire may be forced downwardly into the circular bottom end of the slot andL there held against movement inv any direction transverse to the wire axis.
  • the input transducer-t assembly 32 which ⁇ is connected to the inner end of delay-line wire 31 includes two elongated members 39 of magnetostrictive material which are secured to and ext-end tangentially in the same direction from the end of wire 31, fa transducer sub-assembly 40 adapted to set up longitudinal stress-waves in members 39 ⁇ which reach the wire simultaneously in the same pe- ,'ripheral direction and thereby ,set up correspond-ing ⁇ torsional stress-waves in said wire, a damping termination 41 for the ends of members 39 remote from the wire, and a transducer mounting plate 42 which is riveted or otherwise suitably secured to the bottom of case 34 inside the spirally coiled wire 31.
  • each such member 39 may take various forms, it is preferable to form each such member of two or more tapes or wires bunched together so as to'improve the eiiiciency of the transducer by ⁇ reducing eddygcurrent losses under the transducer coil while still retaining the maximum cross-sectional area of magnetic material within the coil, and also attaining the desired acoustic match at the junction between Vthe -magnetostrictive members and the delay-line wire.
  • each member 39 consists of two relatively thin, flat nickeltapes each having a width of .020 inch and a thickness of ,.002 inch, the ,tapes being superposed with their at sides in contact Vyface of one tape of each pair in contact with the wire,
  • the cross-sectional area, the Youngs modulus and the density of the tapes ⁇ 39 are so related to the radius, shear modulus'and density of the wire 31 that there is acoustic match at the junction therebetween, thereby ensuring maximum eiciency of y energy transfer at the junction and also avoiding reflections at this point which would produce spurious pulses at the output of the delay-line.
  • mounting plate 42 includes a pair of upwardly projecting bifurcated guides 43 which receive and hold the portion of the wire immediately adjacent the inner end thereo-f, and a horizontally extending ciamping bracket 44 is provided which overlies the junction and cushions it against undesired mechanical vibration by means of a pair of foam rubber Ipads 45 interposed between the clamping bracket and the mounting plate.
  • Bracket 44 may be supported in the desired position in any suitable manner, as by a screwed connection to the upper end of a vertical stand-off carried by mounting plate 42.
  • the end portion o-f wire 3l which extends1 through guides 43 may be enclosed as shown in FIG. 7 in a sleeve of suitable insulating material, such as polythene plastic.
  • the transducer sub-assembly 4t2 comprises the electromagnetic means for setting up longitudinal stress-waves in the magnetostrictive members 39, and is also adjustable lengthwise of said members in order to effect slight variations in the delay period of the delay-line.
  • the body of sub-assembly 40 consists of a coil cell 46 in the
  • Each of coils 48 and 49 is wound on a hollow bobbin 52 of polystyrene plastic or other suitable insulating material, the enlarged heads of which have a forced rit in the bores 47 and are provided with V-shaped notches in their periphelies through which the ends of the coil winding extend.
  • the members 39 pass freely through the yaxial holes in the bobbins and are thus surrounded by the coils.
  • a shelf 53 Projecting laterally from one side of coil cell 46 is a shelf 53 carrying three electrical terminals 54, 55 and 56 to which the ends of the coil windings are connected.
  • coils 48 and 49 are similarly oriented in the bores 47, the starting ends of the coil windings are separately connected to terminals 54 and 55, respectively, and the finishing ends of both coils are connected together to terminal 56.
  • Terminals 54 and 55 are also connected by a pair of lead wires 57 to the ⁇ input terminals 58 and 59, respectively, of the delay-line which are insulatedly mounted on the wall of case 34.
  • coil cell 46 is provided with a ange 60 which extends laterally from the side of the cell block opposite shelf 53 and is screwed or otherwise suitably connected to a mating flange 61 projecting laterally from the body of a drive nut .62;
  • drive nut 62 is slidably supported on mounting plate 42, and is provided with a threaded bore 63 having its axis parallel to those of coil bores 47 and magnet bore Sti of the coil cell.
  • An elongated lead screw 64 passes through bore 63 and is rotatably supported at one end in a circular opening in a ange 65 extending upwardly from mounting plate 42 adjacent damping termination 4l, and at the other end in a slotted flange 66 which extends upwardly from mounting plate 42 adjacent clamping bracket 44.
  • the portion of lead screw 64 which is supported in slotted ilange 66 is of reduced diameter so as to provide shoulders engaging the opposite sides of flange 66 which prevent axial movement of the lead screw when the latter is rotated to feed drive nut 62 and coil cell 46 toward or away from wire 3l.
  • Clamping bracket 44 is provided with a horizontally extending portion 67 which is adapted to frictionally engage an Unthreaded portion of lead screw 64 immediately adjacent slotted ange 66 and thereby act as a brake to prevent accidental rotation of the lead screw.
  • lead screw 64 is of sufficient length to permit a variation of 6 microseconds in the delay provided by the device.
  • the outer ends of the tapes forming magnetostrictive members 39 are supported by the damping termination 4i in the manner indicated in FIGS. 7 and 9 so as to absorb the longitudinal stress-waves which travel away from wire 3l and thus prevent reflections that would produce spurious pulses at the output end of the line.
  • termination 41 comprises three elongated damping pads 68, 69 and 7G piled one on top of the other with the bottom pad 68 resting on transducer mounting plate 42 and the top pad 79 surmounted -by a flanged cover plate 7i which is screwed or otherwise suitably connected to the upper ends of four supporting standoffs 72 iixed to and extending upwardly from mounting plate 42 through aligned openings in pads 63, 69 and 70.
  • damping pads are made of a resilient, compressible electrically insulating material, such as silicon rubber, and provide an acoustic wave absorbing support for the outer ends of ltapes 39 the lower pair of which is sandwiched between pads 68 and 69 while the upper pair is disposed between pads 69 and 70.
  • each pair of tapes are separated as indicated in FIG. 7 in order to improve the damping coupling between the tapes and the rubber pads, and may be additionally insulated Iby en- Vclosure within a very thin folded sheet 73 of insulating 39', 49', 41', etc., and therefore need not be described in detail.
  • the output transducer assembly differs from the input assembly only in that (a) lead screw 64 is slightly longer than lead screw 64 so as to provide for a variation in the delay of 8, instead of 6, microseconds; (b) mounting plate 42 and clamping bracket 44 4are of opposite hand to plate 42 and bracket 44; (c) the ends of all four magnetostrictive tapes 39' are grounded to the bottomI of case 34 by a conductor 74 and ground contact 75, the conductor 74 also being connected to a ground terminal 76 extending through the wall of case 34, and (d) the conductors 57 connect terminals 54 and 55' to the output terminals 77 and 78 of the delay-line which are insulatedly mounted on the wall of case 34 similarly to input terminals 58 and 59.
  • each o f the delay-lines above described includes only one input transducer and one output transducer connected respectively to the opposite ends of the torsional stress-wave transmitting wi-re
  • the invention may also be embodied in a delay-line wherein additional transducers of the same construction :as those at the ends of the wire are Aconnected to the latter at intermediate points along the length thereof in order to provide different delay periods with the same line.
  • the delay-line wire may be tapped at any desired point alongits length bysmply spot welding thereto the magnetostrictive tapes of another transducer assembly.
  • a delay-line in accordance with the invention in addition topossessing lthe important advantage of allowing the wire to be used in a curved configuration, has theadditional advantage that the torsional stress-wave transducers which form parts of it are simple and cheap to manufacture inY addition to being very efficient inioperation. v
  • An electro-acoustic delay-line comprising a naturally straight wire disposed in a curved coniguration within the elastic limit of the wire and capable of propagating torsional stress-waves without appreciable dispersion over a wide band of frequencies and having a low temperature coefficient of time delay, -a iirst magnetostrictive transducer for setting up vtorsional stress-waves in said wire at one position along the length thereof, and a second magnetostrictive transducer connected to said wire at a second position along the length thereof axially spaced from said first-named position ⁇ for converting the torsional stress-waves propagated in said Wire into electrical pulses, each of said transducers including a plurality of elongated members of magnetostrictive material.
  • said iirst transducer including means responsive to electrical pulse energy for setting up longitudinal stresswaves in said members which reach the wire substantially simultaneousi@ the dimensions and physical characteristics of said wire and of the magnetostrictive members'of said transducers being so related that there is a mechanical acoustic match between said members and said wire at the junctions thereof.
  • a delay-line as claimed in claim 2 wherein the crosssectional areas of said wire and said members, the shear modulus anddensity of said wire and the Youngs modulus and density of said members are so related as to satisfy the expression A nr G1 W1 I 271 E2 W2 wherein A and r ⁇ are the sectional area of each ymember and the radius of the wire, respectively, G1 is the shear modulus and W1 the density of the wire, E2 ⁇ is the Youngs modulus and W2 the densi-ty of said members, and n is the number of said members.
  • An electro-acoustic delay-line comprising a naturallyy straight wire of uniform diameter disposed in a curved coniiguration within thev elastic limit of the wire and thereby capable of propagating torsional stress-Waves without yappreciable, dispersion over a wide band of frequencies, an input transducer and an output transducer located at different axial positions on the wire, each of said transducers including a plurality of elongated members of magnetostrictive material secured to the wire to extend tangentially from areas of contact located at the same axial position on the wire and spaced around it at equal angular distances, a coil surrounding each of said members of the input transducer for setting up longitudinal stress-waves therein, and a coil surrounding each yof said members of the output transducer for responding to longitudinal stress-Waves therein, the coils of said input transducer being located at-equal distances from the wire and being so connected for simultaneous pulse-energisatween each vof said transducers and said wire at
  • An electro-acoustic delay-line comprising a natura 1y straight Wire of uniformdiameter disposed in a curved configuration within the elastic limit of the wire and capable of propagating torsional stress-waves without appreciable dispersion over a wide band of frequencies, an input transducer and an output transducer located at different axial positions on the wire, each of said transducers including a plurality of elongated mem-bers of magnetostrictive material secured to the wire to extend tangentially from areas of contact which in that transducer are located at the same axial position on the wire and are spaced around it at equal angular distances, electromagnetic means for setting up longitudinal stresswaves in the said members of said input transducer, means for electrically pulse-energising said electromagnetic means, said electromagnetic means being so positioned relative to said members and said wire and being pulse-energised in such a manner that the longitudinal stress-waves reach the wire substantially simultaneously in the same peripheral direction from each member of said input transducer and thereby set up in
  • An electro-acoustic delay-line comprising a natural- Y ly straight wire disposed in acurved configuration within the elastic limit of the wire and capable of propagating ⁇ torsional stress-waves without appreciable dispersion over a wide band of frequencies, an input transducer and an output transducer located at different axial positions on said wire, each of said transducers including a plurality of elongated members of magnetostrictive material secured to said wire to extend tangentially from areas of contact located at the same axial position on the wire and spaced around it at equal angular distances, means responsive to electrical pulse energy for setting up longitudinal stress-waves in the magnetostrictive members of said input transducer which reach the wire in the same peripheral direction and set up corresponding torsional stress-waves in said wire, and means responsive to longitudinal stress-waves in the magnetostrictive-members of said output transducer for producing electrical output 1 l pulses corresponding to the torsional stress-Waves set up in said Wire, the dimensions and physical characteristics of
  • An electro-acoustic delay-line comprising a naturally straight Wire disposed in a curved configuration Within the elastic limit o-f the wire and capable of propagating torsional stress-Waves Without appreciable dispersion over a Wide band of frequencies, an input transducer operably connected to said wire at one point along the length thereof and responsive to electrical pulse energy for setting up torsional stress-Waves in said Wire, and an output transducer operably connected to said wire at a second point along the length thereof and responsive to the torsional stress-wavcs in said Wire for producing electrical output pulses corresponding to said torsional Stress-Waves.
  • lat least one of said transducers includes a plurality of elongated members of magnetostrictive material secured to the wire to extend tangentially from areas of contact which in that transducer are located at the same axial position on the wire and are spaced around it at equal angular distances, the dimensions and physical characteristics of said wire and of the magnetostric-tive members of said transducer being so related that there is a mechanical acoustic match between said members and said wire at the junetions thereof.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176788A (en) * 1960-07-14 1965-04-06 Harris Transducer Corp Transmission of vibratory energy
US3295075A (en) * 1964-02-10 1966-12-27 Motorola Inc Electromechanical transducer devices employing radially polarized piezoelectric crystals
US3327252A (en) * 1963-10-28 1967-06-20 Friden Inc Vibratory delay line having novel support
DE1247387B (de) * 1962-05-07 1967-08-17 Ibm Wandler fuer eine elektroakustische Verzoegerungsleitung
US3460243A (en) * 1964-12-29 1969-08-12 Ibm Maximizing or controlling the gain of sonic delay lines
US3593212A (en) * 1969-04-14 1971-07-13 Digital Devices Inc Temperature-compensated delay line
DE1491348B1 (de) * 1963-10-28 1971-10-28 Singer Co Stuetze fuer die drahtfoermige uebertragungsbahn einer akustischen verzoegerungsleitung
US3898555A (en) * 1973-12-19 1975-08-05 Tempo Instr Inc Linear distance measuring device using a moveable magnet interacting with a sonic waveguide
US4803427A (en) * 1987-05-26 1989-02-07 Amcon, Inc. Precision measuring gauge having sonic delay line with free-standing mode converter armature
US5017867A (en) * 1989-12-08 1991-05-21 Magnetek Controls Magnetostrictive linear position detector with reflection termination
US5050430A (en) * 1990-06-19 1991-09-24 Magnetek Controls Magnetostrictive linear position detector with temperature sensors

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GB714627A (en) * 1952-02-22 1954-09-01 Elliott Brothers London Ltd Improvements in means for delaying electric impulses
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US2810888A (en) * 1954-08-03 1957-10-22 Rca Corp Electromechanical filter
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US2430013A (en) * 1942-06-10 1947-11-04 Rca Corp Impedance matching means for mechanical waves
US2495740A (en) * 1945-07-09 1950-01-31 Standard Telephones Cables Ltd Magnetostrictive time-delay device
GB714627A (en) * 1952-02-22 1954-09-01 Elliott Brothers London Ltd Improvements in means for delaying electric impulses
US2800633A (en) * 1953-06-25 1957-07-23 Rca Corp Termination of mechanical vibratory systems
US2799832A (en) * 1953-09-11 1957-07-16 Motoroln Inc Electromechanical filter
US2810888A (en) * 1954-08-03 1957-10-22 Rca Corp Electromechanical filter
US2828470A (en) * 1955-03-08 1958-03-25 Bell Telephone Labor Inc Tapped torsional delay lines
US2906971A (en) * 1956-02-10 1959-09-29 Bell Telephone Labor Inc Torsional vibrational wave filters and delay lines

Cited By (12)

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Publication number Priority date Publication date Assignee Title
US3176788A (en) * 1960-07-14 1965-04-06 Harris Transducer Corp Transmission of vibratory energy
DE1247387B (de) * 1962-05-07 1967-08-17 Ibm Wandler fuer eine elektroakustische Verzoegerungsleitung
US3327252A (en) * 1963-10-28 1967-06-20 Friden Inc Vibratory delay line having novel support
DE1491348B1 (de) * 1963-10-28 1971-10-28 Singer Co Stuetze fuer die drahtfoermige uebertragungsbahn einer akustischen verzoegerungsleitung
US3295075A (en) * 1964-02-10 1966-12-27 Motorola Inc Electromechanical transducer devices employing radially polarized piezoelectric crystals
US3460243A (en) * 1964-12-29 1969-08-12 Ibm Maximizing or controlling the gain of sonic delay lines
US3533021A (en) * 1964-12-29 1970-10-06 Ibm Sonic delay line
US3593212A (en) * 1969-04-14 1971-07-13 Digital Devices Inc Temperature-compensated delay line
US3898555A (en) * 1973-12-19 1975-08-05 Tempo Instr Inc Linear distance measuring device using a moveable magnet interacting with a sonic waveguide
US4803427A (en) * 1987-05-26 1989-02-07 Amcon, Inc. Precision measuring gauge having sonic delay line with free-standing mode converter armature
US5017867A (en) * 1989-12-08 1991-05-21 Magnetek Controls Magnetostrictive linear position detector with reflection termination
US5050430A (en) * 1990-06-19 1991-09-24 Magnetek Controls Magnetostrictive linear position detector with temperature sensors

Also Published As

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NL284393A (enrdf_load_html_response)
NL207718A (enrdf_load_html_response)
DE1215272B (de) 1966-04-28
CH342991A (de) 1959-12-15
NL125027C (enrdf_load_html_response)
GB799201A (en) 1958-08-06
FR1153745A (fr) 1958-03-20

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