A circuit for energizing a differential inductor transducer uses rectifier voltage dividers in a balanced bridge circuit.

A variable reluctance transmitter is disclosed wherein a pair of axially positioned coils have annular magnetic pole members on their inner peripheries, and an armature member of magnetic material moves linearly within the pole members. Sensor means moves the armature within the pole members and electrical means are provided for adjusting selectively the voltage range transmitted by the movement of the armature within the coils.

An encoding device includes two circular arrays of five equally spaced windings disposed in opposite relationships to sandwich a rotatable metallic disc provided with four openings. The openings are arranged such that, as the disc is rotated according to the measured decimal measurand, any two of them are always put between selected two pairs of opposite windings. With one of the winding arrays energized the selected two windings of the other array induce voltages indicating the measured measura...

In an electrically inductive motion detector of the type having a pair of permanently magnetized pole pieces, each magnetized with a non-alternating polarization, and adjacent a movable magnetic armature element and mutually spaced apart in a direction parallel to preselected motion of the armature element, a sensor winding wound upon a respective one of the pole pieces, logic device for indicating the time of coincidence of the position of the armature element and a reference position during sa...

A displacement-electric signal converter comprises two annular magnetic bodies disposed concentrically, a magnetizing coil placed in an air gap formed between the two annular magnetic bodies, a short-circuiting ring freely rotatably provided on one of the two annular magnetic bodies, and at least one detecting coil provided on one of the two annular magnetic bodies for detecting magnetic fluxes flowing the interior of the annular magnetic body, an a.c. voltage being supplied to the magnetizing c...

The angle between a small radio frequency coil and a spatially uniform magnetic field is measured and a signal commensurate with the measured angle is employed in a computation of angular position. The apparatus employed in the angle measurement is characterized by a DC frequency response whereby an output signal is produced in the absence of motion between the coil and field.

A reliable digital shaft encoder capable of operating at high speeds is shown. A plurality of magnetic segments are embedded in the rotor of the encoder forming two staggered rows. The stator contains a plurality of E shaped magnetic strips through which excitation and pickup coils are wound. Magnetic coupling from the stator strips through the rotor segments induces a voltage in the pickup coils which is then demodulated to provide a position indication.

An electromagnetic position indicator to continuously indicate the position of a linearly movable mobile, such as a nuclear reactor control rod, operatively connected to magnetic core means which vary the inductive coupling between primary and secondary windings. One of the windings, preferably the secondary winding comprises pairs of oppositely connected coils spaced apart in the direction of movement of the core means to improve the measurement precision. Analog or digital means may be provide...

A rotatable insulating disc carries a closed grid of conductors over one part of one side and a similar but open grid over another part. An oscillator is coupled to a coil which is parallel to the disc and produces a cyclically varying but symmetrical field through the disc. Two pairs of pick-up coils sense, for respective orthogonal directions, the distortion of the field by the closed grid and detector circuits coupled to the pick-up coils provide signals representing the sine and cosine of th...

A filter module assembly utilizes a priority valve installed in a manifold to allow for continuous filtration of hydraulic fluid up to a predetermined flow value and diverts occasional high flow to a secondary circuit. This arrangement provides both a low pressure drop at a high flow condition and structural integrity (1,000,000 impulse cycles from 0 to 6000 psi) while at the same time may reduce the weight by as much as 50% from a conventional design approach.