Abstract: A rotor transformer positioning mechanism permitting automatic positioning of a rotor transformer, having a first winding, relative to a rotor stack, having a second winding, mounted on a common rotary shaft to thereby permit a crossover having a predetermined length to be installed between the first and second windings includes a crossover positioning cutout disposed in a first flange of the rotor transformer. In an exemplary case, the rotor transformer includes the first flange and a second flange disposed on opposite ends of the first coil, and the second flange is proximate to the crossover. A method of assembling a rotating machine using the rotor transformer positioning mechanism is also described.

Abstract: Processing circuitry is provided for processing signals received from, for example, sense coils forming part of a position encoder used to encode the relative positions of two relatively moveable members. The position encoder is such that each of the plurality of signals from the sense coils varies sinusoidally with the relative position of the members but out of phase with respect to each other. The processing circuitry comprises mixers for multiplying each of the received signals with one of a corresponding plurality of periodic time varying signals, each having the same predetermined period and a different predetermined phase, and an adder for adding the signals from the mixers. The phase of the mixing signals are chosen so that the output signals from the adder contains a single periodic component having the predetermined period whose phase varies with the relative position of the two members.

Abstract: Disclosed is a linear actuator, controllable as a spring, having a field assembly and a coil assembly positioned for interaction with and movement relative to the field assembly. The field assembly has a soft magnetic housing having an axis, axially magnetized cylindrical magnets and soft magnetic pole pieces which form a stack of alternating cylindrical magnets and pole pieces positioned along the axis. The coil assembly includes a coil base having coil cavities, coils supported in the coil cavity, and an axially magnetized permanent magnet positioned on the coil base so that the axially magnetized permanent magnet is positioned to travel along the axis of the soft magnetic housing. A repulsion force is generated between the coil assembly and the field assembly when the coil assembly is de-energized, and the repulsion force is modified when the coil assembly is energized.

Abstract: An inductive transformer for transmitting measurement data and/or electrical energy between two components (1, 2) moving relative to one another includes one primary and one secondary transformer part (4, 5), in which a gap is formed between the moving components (1, 2). A slide ring (6; 7), which is made of a plastic with embedded ferromagnetic metal parts is disposed in the gap. The metal parts are distributed nonhomogeneously in the plastic, such that their proportion, on the end with which it is solidly disposed on one of the components (1, 2), is high and becomes relatively slight toward the end with which it rubs against the respective other component (1, 2).

Abstract: A deflection yoke includes a bobbin having a cavity formed in the longitudinal direction of the bobbin, and an adjusting coil having a magnetic core on which a thread is cut. The core inserted into the cavity is slidable in the longitudinal direction of the bobbin. The core has a marker formed on only one of ends of the core in the longitudinal direction. The core has been inserted into the cavity from the one end formed with the marker or the other end. The marker is formed on only one of ends of the core before or after the thread is cut thereon.

Abstract: An apparatus and method for mixing a liquid component and a powdered component to form a bone filler has first and second syringes each having a barrel, a plunger and an exit port. The plunger is moveable with the barrel of each syringe along a longitudinal axis of the barrel. An end portion of each plunger extends beyond the end of each barrel when the plunger tip is spaced from the exit port and can be activated to move the plunger tip toward the exit port. A mechanism for mixing the liquid and powdered components is operatively connected to each of the barrels and plungers of the first and second syringes so that the relative sliding movement of first and second parts of the mechanism simultaneously moves the plungers and barrels of the first and second syringes relative to one another to move the combined liquid and powdered components back and forth between the first and second syringe.

Abstract: A conventional light plate for a systems control panel is mounted on a machined front plate which, in turn, is maintained a predetermined uniform distance from a front printed wiring assembly (PWA). A plurality of systems control devices including one or more of switches (toggle switches, rotary switches, push button switches), rheostats and annunciators are mounted on the front plate and front PWA. Each of the systems control devices has one or more solid state elements mounted on the PWA. For example, the switches carry small magnets which, by manipulation of operating switch levers or knobs, move into and out of close proximity to magnet sensitive switching devices mounted on the front PWA.

Abstract: In a robot machine having a plurality of rotational joint axes, a rotational angle of rotational joint axis and a tilt angle of robot arm against the direction of gravity are measured at three or more of rotational angle positions to obtain rotational angle information &THgr;i and tilt angle information Yi, and regression factors &agr; and &bgr; are derived by computation from a resulting regression function of Y=&agr; SIN(&THgr;+&bgr;)+&ggr;, thereby performing an original point adjustment of rotational joint axis based on the obtained tilt angle and tilt direction thereof.

Abstract: An isolation transformer is provided having primary and secondary cores (2, 4) and primary and secondary coils (3, 5), with the primary coil and the secondary coil being disposed with a gap G provided therebetween. Each of the primary coil and the secondary coil is formed of a wire having at least two substantially parallel long sides, and a length of the two long sides in each of the wires is set to be longer than a distance between the two long sides in each of the wires. Each of the wires is wound to have a plurality of turns in a manner such that an outer one of the two long sides of each inner one of the turns is adjacent to an inner one of the two long sides of each respective adjacent outer one of the turns.

Abstract: A microelectromechanical component (1) providing filtering functions, produced on a semiconductor-based substrate (10) and comprising two input terminals (7, 8) and two output terminals (26, 27), which also comprises:

Abstract: A position detector is provided for detecting the relative movement of first and second members which are mounted for relative movement along a measuring path. One of the members comprises a magnetic field generator for generating a magnetic field and the other member comprises first and second conductors which are inductively coupled to said magnetic field generator. The arrangement of the first and second conductors and the magnetic field generator is such that output signals are generated in a first and second receive circuits whose position varies with the relative movement between the two members. In addition to carrying information relating to the relative position between the two members, the signals induced in the receive circuits also comprise information defining the relative orientation of the two movable members, and by suitable processing of the received signals the relative orientation of the two members can also be determined.

Abstract: A non-contact electric power transmission apparatus including a primary unit and a secondary unit. The primary unit includes a primary core and a power primary winding. A signal secondary winding is wound around the primary core and provided to be apart from the power primary winding to form a primary gap between the power primary winding and the signal secondary winding. The secondary unit includes a secondary core and a power secondary winding. A signal primary winding is wound around the secondary core and provided to be apart from the power secondary winding to form a secondary gap between the power secondary winding and the signal primary winding.

Abstract: A tuned filter for connection to a busbar in a high voltage electric power system. The filter incorporates a variable inductor comprising a main winding, auxiliary windings and switching circuitry associated with each auxiliary winding. The auxiliary windings are arranged to act in inductive series with respect to the main winding, and the switching circuitry is used to selectively connect the auxiliary windings in electrical series with the main winding, so allowing the inductance of the inductor to be varied. To achieve enhanced variability of the inductance, each auxiliary winding has a number of turns substantially equal to x2(n−1), where n is a positive integer corresponding to the position of each auxiliary winding in the inductive series of auxiliary windings and x is also a positive integer.

Abstract: A magnetic induction device having at least one secondary induction assembly including a secondary winding is mounted on a rotary element. A magnetic flux is induced the secondary induction assembly, causing an induced secondary alternating current in the secondary winding of the secondary induction assembly. The secondary alternating current is converting to direct current and is stored in an electrical storage device.

Abstract: A variable inductance transformer includes a core defining a gap between opposing first and second ends. A primary winding and at least one secondary winding are coupled to the core. The secondary winding is provided for stepping up the voltage across the primary winding. A carriage assembly includes a magnetic shunt movable against the core and variably across the gap. The magnetic shunt has a width at least as wide as the gap for moving the shunt to a predetermined position along the core in a range from an uncovered position not overhanging the gap, throught intermediate positions overhanging the gap, to a covered position where the shunt bridges the gap. A control circuit controllably energized a motor to move the carrriage assembly and position the magnetic shunt against the core for adjustably varying the inductance of the secondary winding a to maintain a high output voltage of the transformer for a given resistive supply current.

Abstract: The method and apparatus for supplying power to a rotary element by magnetic induction. A magnetic induction device having at least one secondary induction assembly including a secondary winding is mounted on the rotary element. A magnetic flux is induced the secondary induction assembly, causing an induced alternating current in the secondary winding of the secondary induction assembly. The secondary alternating current is converting to direct current and is stored in an electrical storage device. A rotary cathode plater is disclosed as a particular application of the apparatus by which power is transferred to a storage battery or high capacity capacitor, without the use of wires.

Abstract: A position detector is provided for detecting the relative movement of first and second members which are mounted for relative movement along a measuring path. One of the members comprises a magnetic field generator for generating a magnetic field and the other member comprises first and second conductors which are inductively coupled to said magnetic field generator. The arrangement of the first and second conductors and the magnetic field generator is such that output signals are generated in a first and second receive circuits whose position varies with the relative movement between the two members. In addition to carrying information relating to the relative position between the two members, the signals induced in the receive circuits also comprise information defining the relative orientation of the two movable members, and by suitable processing of the received signals the relative orientation of the two members can also be determined.

Abstract: A linear gauging head, or cartridge head, comprises a casing, a spindle movable with respect to the casing along a longitudinal axis, a feeler coupled to a first end of the spindle and a differential position transducer with windings, fixed with respect to casing, and a core coupled to a second end of spindle. The spindle is guided by recirculating ball bushings with rolling elements that cooperate with the spindle and thus allow its displacement with respect to the casing.

Abstract: A micromechanical variable/tunable inductor is disclosed. The present inductor comprises at least two elements capable of supporting spatial electromagnetic coupling and means for varying a geometrical relationship thereof. Varying the geometrical relationship between such elements varies the inductance of the inductor. In some embodiments, the geometrical relationship that is varied is the spacing between the two elements. The spacing is varied by creating a differential movement between such elements. In further embodiments, the present invention comprises resonant circuits incorporating such variable inductors, and oscillators including such resonant circuits.

Abstract: A linear gauging head, or cartridge head, comprises a casing (1), a spindle (10) movable with respect to the casing along a longitudinal axis, a feeler (12) coupled to a first end of the spindle and a differential position transducer with windings (13, 14, 15), fixed with respect to casing (1), and a core (16) coupled to a second end of spindle (10). The spindle is guided by recirculating ball bushings (18, 19) with rolling elements (29) that cooperate with the spindle and thus allow its displacement with respect to the casing.

Abstract: High frequency reactors for interconnecting a high frequency electrical power source and a load which reactors include a pair of plates having opposite surfaces with a length and width and a thickness between the surfaces which is small relative to the length and width of the surfaces. The plates are disposed with opposing closely spaced surfaces insulated from each other, and each of the plates has longitudinally aligned first and second portions with one portion of one of the plates electrically insulated from another portion of the plates and conductively interconnected by a variable reactance with another portion of the plates.

Abstract: A group of secondary windings are distributively provided on a stator over a predetermined range, and the respective inductance of the secondary windings in the group is set in such a manner to present predetermined inductance distribution. A rotor has an eccentric shape so as to cause variations in magnetic coupling at individual poles of the stator in response to its current rotational position. By combined use of the magnetic coupling variations between primary and secondary windings on the stator and the predetermined inductance distribution of the secondary windings, high-accuracy detection of a rotational position is achieved with a simple structure. A plurality of primary windings may be set so as to present predetermined inductance distribution.

Abstract: A travel sensor (10) is proposed which has a insertion body (11) consisting of non-ferromagnetic material with good conductive properties. The insertion body (11) is submerged into a measuring coil (15) through which alternating current flows. In addition, the travel sensor is enveloped by a shielding sleeve (16) consisting of ferromagnetic material. Due to the alternating effect between the magnetic field of the coil (15), through which an alternating current flows, and the two materials, at designated frequencies of the alternating current and the respective volume of the insertion body (11) or the shielding sleeve (16), it is possible to compensate the effects of the temperature in such a way that at varying temperatures the measuring curves of the travel sensor (10) extend nearly parallel across the entire measuring range.

Abstract: A pickup device has a core to which a coil is wound about. The core has a body formed by laminating a plurality of plates having a predetermined shape. Eddy currents produced by leakage flux is suppressed at the ends of the core. This is achieved by laminating a plate, which has a certain shape and is made of a material having a higher electric resistance value than the body, to the ends of the body. The generation of eddy currents may also be suppressed by providing notches at the ends of the core to obstruct the formation of a magnetic circuit at the ends. As another option, space may be provided at the ends of the core to disconnect the path of eddy currents.

Abstract: A transducer comprises a pair of inductive coils connected in series. The coils of the pair are arranged adjacent one another with respective end faces of the coils substantially mutually aligned. A magnetically permeable member is movable relative to the end faces in such a manner that the impedance offered to an AC signal by one coil increases while the impedance offered to the signal by the other coil decreases. The end faces of the coils may be curved and arranged diametrically opposite one another around the circumference of a circle, and the magnetically permeable member may comprise a generally semi-circular plate, rotatable about an axis passing through the center of the circle, for covering approximately half of the total area of the end faces of the coils. This arrangement provides for linearity of output voltage variation with angular position of the plate.

Abstract: A new linear position transducer is disclosed which is substantially identical to the transducer described and illustrated in U.S. Pat. No. 4,667,158, except that the tubular layer contained between the coil and the outer shield comprises a silicon steel foil wrapped around the coil which has the effect of reducing the reluctance of this space to a low value. An electrical insulator is applied to one side of the silicon steel foil to prevent the creation of a current path between the coil and the outer shield of the transducer.

Abstract: A motion and position sensor includes a stationary member having active conductors that carry energizing power and sensing conductors that are electromagnetically coupled by a movable member to generate signals in the sensing conductors that are representative of the position of the movable member. The movable member is contactless and therefore requires no electrical connection to any other component. Thus, frictional reactance torque and electromagnetically generated torque are reduced to a minimum.

Abstract: A method and system for exploiting the signals of linear inductive sensors, which system is adaptable for different sensor structures. The system is formed of a linear inductive displacement sensor provided with a primary coil and two identical symmetrical secondary coils which are in series and in antiphase. A mobile core and an alternative voltage source are mounted between the terminals of the primary coil wherein the amplitude of the voltage at the primary coil terminals is greater than the maximum amplitude of the voltage that can be taken at the secondary coil terminals. The method has the steps of forming the sum of the two alternative voltages present at the primary and secondary coils. These voltages are rectified by means of full wave rectifying and deriving the difference between the sum of recitified voltages. A continuous means valve corresponding to the difference is also derived.

Abstract: A push button for an inductive value input keyboard having a push-button socket, a push-button head guided in the push-button socket, a compression spring which acts between the push-button socket and the push-button head, a stop which limits the stroke of the push button in the non-actuated state, and a rod-shaped iron core fastened to the push-button head for interaction with an induction coil formed by conductor paths upon a printed circuit board on which the push button is arranged. A sleeve is molded at the push-button head and has a non-cylindrical aperture therethrough and is elastically deformable transverse to its axis within which the iron core is clamped.

Abstract: A displacement detector includes a movable member of a magnetic material movable as a function of the displacement of an object which is to be detected, an AC signal source, a primary coil energizable by an AC signal supplied by the AC signal source for generating a magnetic field in the direction in which the movable member is movable, secondary coils located in at least two positions spaced along and disposed around the path of movement of the movable member, a third coil disposed in the range of movement of the movable member and around the path of movement of the movable member, first, second, and third rectifier circuits connected respectively to the secondary coils and the third coils, and a processing circuit for processing outputs supplied from the first, second, and third rectifier circuits. The displacement detector can be incorporated in an automotive power steering device having input and output shafts coaxially coupled to each other by a resilient member which is twistable about its own axis.

Abstract: An inductance coil sensor in which a rotating spoiler (46) alters the inductance of a stationary coil (1230/1432) having two parts (12a, 12b; 30a, 30b/14a, 14b; 32a, 32b) disposed on opposite sides of the spoiler. Changes in inductance of the stationary coil are sensed to develop an indication of the rotary movement of the spoiler which, in turn, represents changes in the parameter being monitored. By locating one part of the stationary coil above the spoiler and one part below the spoiler, compensation is provided for undesired movements of the spoiler along its rotation axis.

Abstract: A unipolar signal indication of core position is provided in an inductive displacement transducer, such as an LVDT, as the sum magnitude of the transducer's applied primary winding voltage signal and the transducer's induced secondary winding voltages.

Abstract: Disclosed are a transducer for converting linear motion of a core into a proportional change in inductance by means of skin effect, and bridge processing circuitry for stable conversion of changing inductance into a proportional voltage.

Abstract: A series of rotary sensors are disclosed. Each sensor consists of a drive coil which is a planar coil configuration separated from a sensing coil which is parallel to the drive coil. Interposed between the drive and sensing coils is a rotatable plate fabricated from a material capable of blocking a magnetic field induced in a drive coil from reaching or activating the sensing coil. The rotatable plate is shaped to allow predetermined amounts of flux to couple from the drive coil to the sensing coil as the plate is rotated. The shape of the plate therefore determines the signal provided at the sensing coil to enable one to provide such signals indicative of the angular movement of the plate between wide limits as from zero to 360.degree.. Other configurations utilizing a plurality of drive and sense coils and special shaped plates provide sine and cosine outputs as well as enable one to determine the quadrant of operation.

Abstract: An improved transformer (20) and method of transformer construction. Primary and secondary windings (30 and 32) are spirally wound onto a spherically shaped core member (24). The core is preferably of laminated construction and can be of either planar or radial configuration. A flux intensifier shield member (40) defines an inner spherical cavity (Y) sized to cooperatively overlie and substantially enclose the inner core and winding assembly. The shield may comprise a pair of hemispherically shaped members including radially extending leaf-like vanes (46) that enable and enhance cooling of the core assembly as well as providing improved transformer efficiency and protective shielding of the core assembly.

Abstract: An inductive displacement transducer is described in which the magnitude of the phase difference between A.C. current and voltage in a coil is dependent upon the axial displacement of a monitored object. The phase difference depends upon the axial position relative to the coil of a short-circuit turn which moves with the monitored object. A magnetic flux concentrator, which may be combined with the short circuit turn, enhances the flux linkage between the short-circuit turn and the coil. In order to sense the height of a vehicle suspension strut, the coil is mounted on a plastics dirt shield, the short-circuit turn is provided by a sleeve plated with an electrically conductive metal and secured to the strut cylinder. Various circuits are described for monitoring the height signals produced by the different suspension struts of a vehicle.

Abstract: Noncontacting transformer switches are interconnected into keyboard networks which include insertable magnetic core, shorted turn or combination actuators. In a preferred embodiment, windings are provided and interconnected to form differential transformers. An actuator is inserted through one primary/secondary winding pair to switch the differential transformer between a balanced or "off" state and an unbalanced or "on" state. In one embodiment, single turn primary windings and their interconnecting network are printed on one side of a printed circuit board, and single turn secondary windings and their interconnecting network are printed in proper alignment on the opposite side of the board. A single hole aligned with a switched primary/secondary winding pair is provided for each transformer switch and actuators are arranged to be inserted through the holes.

Abstract: An angular displacement transducer of the variable reluctance type is disclosed. It utilizes two relatively rotatable rotors with two sets of magnetic circuits and a coil associated with each magnetic circuit. Each set of magnetic circuits has a set of magnetic cores, one-half the cores on one rotor and one-half on the other rotor. A pair of cores in the first set, one on each rotor, coact with each other to provide a first variable reluctance magnetic circuit which is magnetically linked with the first coil and which has a reluctance that varies with relative rotation of the rotors. A pair of cores in the second set, one on each rotor, coact with each other to provide a second variable reluctance magnetic circuit which is magnetically linked with the second coil and which has a reluctance that varies with relative rotation of the rotors.

Abstract: A joystick mechanism generates output signals corresponding to the X and Y components of a manual command. A transducer mounted in a housing includes a ferromagnetic vane member connected to the bottom of a handle extending into the housing. The transducer also includes a stator member having nine legs mounted in a 3 by 3 rectangular array. The primary winding is wound around the central leg. Two pairs of opposed secondary windings are wound around each set of three outside legs, wherein the X-axis is disposed between one pair of secondary windings and the Y-axis is disposed between the other pair of secondary windings. Primary windings may be wound around the central three legs to form a symmetrical cruciform. The handle can be fixed to a deformable top plate or be supported at a rigid top plate by a ball and socket.

Abstract: A rotary differential transformer is provided which has a constant amplitude output the phase angle of which varies with the angular displacement of a rotor. The rotor contains a pair of core segments of magnetic material which serve to couple portions of first and second primary coils to a secondary coil. The primary coils are connected to AC sources 90.degree. out of phase with each other.

Abstract: A variable inductor includes a coil, a moveable contactor, and moveable magnetic material caused to move proximate the coil and simultaneously with the contactor. The contactor establishes first and second portions of the coil and, relative to the condition using no magnetic material, the inductance of the first portion is increased while the inductance of the second portion is substantially unchanged. Thus, over substantially all the tuning range, the first portion inductance is maintained greater than the second portion inductance.

Abstract: A displacement transducer includes a non-magnetic non-conductive former mounting helical bifilar windings. Slidable within the former is a conductive non-magnetic member the position of which is varied for the purpose of measuring displacement. The windings in use form the frequency determining component of an oscillator the frequency of which is a measure of the setting of the member.

Abstract: A synchronous oscillator demodulator for linear variable differential transformers and synchronous resolvers having electronic circuitry designed to digitally construct a preferred waveform of a predetermined frequency and to establish precisely the preset point at which the amplitude of the waveform is to be measured at the secondary winding of the transformer. This synchronous oscillator demodulator permits the use of linear variable differential transformers and synchronous resolvers for high frequency applications and under conditions of noise and vibration while still maintaining a high degree of accuracy and repeatability. A system and apparatus to enhance the signal from a given linear variable differential transformer and tune same in relation to the signals of other similar but not identical transformers is disclosed.

Abstract: A variable reluctance transducer assembly for measuring the strain deflection in a structural member includes an elongate housing which is mounted to a first lug extending transversely outwardly from the structural member. The housing supports a pair of magnetic cores in spaced parallel relationship to each other. Each core in turn supports a wire coil. The coils are wired to each generate a magnetic field when energized by an electric current. The transducer assembly is also composed of an elongate target mounted on a second lug extending transversely from the structural member at a location longitudinally spaced from the other lug. The target includes a plate portion which extends longitudinally toward the housing to lie nominally between the two spaced apart cores and their corresponding coils to form a portion of the path along which the magnetic lines of flux eminating for each of the two coils travels.

Abstract: A linear position measurement system including a linear member and a relatively movable member. The linear member includes a plurality of serpentine electrical conductors, each representing one bit of a multiple bit Gray code. At any longitudinal position of the movable member, an inductor in the movable member induces oppositely phased signals in those conductors which lie along a first long edge of the linear member and in those which lie along an opposite edge. A phase comparator in a readout device attached to the conductors compares the signals from each conductor with a reference and constructs a unique address code word indicative of the position of the movable member. The inductor in the movable member is activated through a special circuit which is powered by inductive coupling with a coil carried by the linear member.

Abstract: A pressure transducing apparatus which is responsive to the pressure variations which are produced when an individual signs his signature, for generating an electrical signal representative of such characteristic pressure variations for use in a signature identification system. The apparatus employs a handwriting surface which is positioned for receiving the handwritten signature by a pair of soft rubber supports. A permanent magnetic bar is affixed to the underside of the writing surface and is vertically displaced as the pressure applied to the writing surface is varied. A magnetic sensing coil is positioned around the path of vertical displacement of the permanent magnetic bar such that an electrical current is generated in the sensing coil in response to the displacement of the permanent magnetic member so as to provide an electrical signal which is representative of the characteristic pressure variations produced when an individual writes his signature.

Abstract: A pressure transducing apparatus which is responsive to the pressure which is exerted by an individual when he signs his signature for generating an A.C. electrical signal representative of the characteristic variations in pressure produced when an individual signs his signature for use in a signature identification or verification system. The pressure transducing platen includes a writing surface means which is positioned for receiving an individual's signature and has attached thereto a rod member having an upper non-magnetic portion rigidly attached to the bottom of said writing surface means and a lower magnetic portion which moves along a vertical axis in response to the pressure variations exerted on the writing surface. Three coils, each of which has a central hole therein, are positioned so that the magnetic portion of the rod resides within at least a portion of the central hole of each of the coils for vertical movement therein.

Abstract: An inductive displacement transducer comprising a current measuring bridge circuit including a pair of adjustable electrical resistors coupled in series relationship in one half thereof, and a pair of series coupled induction coils and a movable magnetic armature in the other half of the bridge circuit. Each induction coil has the same inductance L when the armature is positioned symmetrically with respect to the coils, and the ohmic resistance R.sub.s of each bridge circuit branch which includes an induction coil is the same. The improvement of the invention comprises the provision of a pair of series coupled electrical shunt resistors, each coupled to one of the induction coils, having an electrical resistance R.sub.p which is determined by the equation R.sub.p =W.sup.2 L.sup.2 /R.sub.sWhere WL is chosen so as to be substantially greater than R.sub.s.

Abstract: A variable reluctance transducer assembly for measuring the strain deflection in a structural member includes an elongate housing which is mounted to a first lug extending transversely outwardly from the structural member. The housing supports a pair of magnetic cores in spaced parallel relationship to each other. Each core in turn supports a wire coil. The coils are wired to each generate a magnetic field when energized by an electric current. The transducer assembly is also composed of an elongate target mounted on a second lug extending transversely from the structural member at a location longitudinally spaced from the other lug. The target includes a plate portion which extends longitudinally toward the housing to lie nominally between the two spaced apart cores and their corresponding coils to form a portion of the path along which the magnetic lines of flux eminating for each of the two coils travels.