The optical processor employs a photoconductor-activated liquid crystal as a spatial filter to control transmissivity of coherent light through the processor. The liquid crystal filter pattern determines the pattern input to Fourier transform and can optionally also define the transmissivity of a Fourier processing filter. This permits near real time transform.

A crystal oscillator frequency signal and a shift frequency signal are selectively combined in a PUT and TAKE circuit comprising digital dividers and logic gating. An output signal from a ramp generator which is derived from the crystal oscillator frequency signal is compared in a comparator with an input D.C. voltage. PUT and TAKE signals generated by the comparator are applied to the PUT and TAKE circuit for selective control thereof. The PUT and TAKE circuit generates a signal having a freque...

Multiplexed operation of a plurality of liquid crystal numeric indicators is achieved by applying a unipolarity, alternating exciting voltage to the backplate of a selected indicator, applying to all other backplates a unipolarity alternating voltage in a frequency range above that at which light scattering occurs, and applying to each segment of all indicators a unipolarity alternating exciting voltage which may be either in phase with or 180.degree. out-of-phase with the exciting voltage appli...

This disclosure relates to crystals, and particularly to plating techniques or improving the quality of crystals. More particularly, this disclosure relates to the production of crystals having a minimum of unwanted, or inharmonic, modes of oscillation. This disclosure describes an apparatus and a method for taking a mode spectrograph to determine the impedance characteristic of a crystal in the frequency range of a desired harmonic while the crystal is in the process of being plated in a vacuum...

A piezoelectric crystal assembly in which a base is provided having small diameter tubulations parallel to one another with a center-to-center spacing which corresponds to the center-to-center spacing of crystal lead wires which extend straight downwardly at right angles from the undersurface of the crystal, with the leads being telescoped into the tubulations and soldered therein to provide the sole support for the crystal and with the lead wires being elongated to extend beyond the tubulations...

A device for driving an electro-mechanical transducer of a timepiece from a quartz crystal oscillator including a switching circuit formed with an active element having an insulated gate type transistor and a bipolar type transistor. The electro-mechanical transducer is driven from said bipolar type transistor, which in turn is controlled and switched by the saturation current flowing through said insulated gate type transistor.

There is disclosed the preparation of liquid-crystal compounds of the structure: ##SPC1## Where x is an integer of 0 to 10 and y is the same or different integer of 1 to 10. The compounds are prepared by the reaction of para-n-alkylaniline and para-n-alkenyloxybenzaldehyde.

A sensor for measuring component magnetic fields utilizing a first magnetic field to be measured, and a perpendicular second magnetic field. The fields are modulated by first and second coils individually wound around first and second nonmagnetic cores. The nonmagnetic cores are hollow and intersect. A paramagnetic crystal is located at the intersection of the cores and is oriented to provide a maximum nuclear magnetic resonance signal. In one embodiment, a magnetometer is employed which include...

During device filling, as by flowing the liquid crystal material through ports opening into opposite ends of the device, the walls of the device are caused to alternately outwardly bow and inwardly collapse to cause variations in the paths of flow of the material through the device.

In this filter, each one of two coupled resonators is formed on a different crystal wafer. Each wafer is accurately positioned with respect to one longitudinal groove in the periphery of a ceramic ring. The wafer is supported in the central opening in the ring with wires which are soldered to metalized areas of the ring and to resonator lead patterns on the wafer to form a resonator assembly. Each resonator is tuned to operate at a predetermined frequency by locating the associated resonator ass...