Abstract: The luminaire for a prism light guide system consists of a longitudinal hollow structure made of transparent dielectric material. The structure has inner and outer surfaces which are in octature, and at least a portion of one outer surface that has a light release mechanism. The light release mechanisms include a non-planar surface, a rough outer surface, or round corners in a corrugated outer surface. The luminaire can further include a device positioned within the hollow structure for increasing the divergence angle .theta. of the light. It can consist of a diffusion screen or a mirror. Some of the walls may also be covered by a reflective material to redirect any escaping light back into them.

Abstract: The electrostatic conveyor consists of a duct having an inlet and an outlet, and apparatus for generating travelling, curvilinear, AC fields along the length of the duct. Charged particles, of conductive or non-conductive materials, under electrostatic forces, are exposed to unidirectional, centrifugal forces so that they are moved along the duct from the inlet to the outlet.

Abstract: Spraying apparatus comprising a shroud in the form of a tube flared at one end and made of electrical insulating material, said shroud adapted for connection to an air supply such that in operation a high velocity air stream issues from the flared end of the shroud, at least one air shear nozzle mounted inside the shroud adjacent the flared end, a tube adapted for connection to a liquid spray source for supplying the nozzle such that in operation the liquid is atomized by the high velocity air flow and the expansion of compressed air from the supply passing over the nozzle, means for maintaining the liquid in the nozzle at ground electrical potential, a high voltage metal electrode positioned inside the flared end of the shroud in spaced relation to the nozzle, and means for supplying high voltage to the electrode such that in operation the electrode carries a high voltage positive or negative potential effective to charge by induction liquid particles or droplets issuing from the said nozzle.

Abstract: An atomized cloud of droplets having an electric charge is generated wherein different discrete parts of the cloud are formed from different liquids. The discrete part of the cloud which has an active ingredient, such as a chemical insecticide or herbicide, is contained such as by enveloping it or directing it in a particular direction by a further discrete part of the cloud that includes an inert liquid such as water. The spraying apparatus comprises a plurality of nozzles positioned in a high velocity air stream to disperse liquid and generate an atomized cloud of the liquid. The nozzles are grouped into at least two sets, each set being arranged and positioned to generate a discrete part of the cloud. An electric charge is placed on the droplets as they are emitted. Each set of nozzles further include a liquid reservoir connected to the nozzles. Each reservoir is to contain a different liquid whether it be an inert liquid or different concentrations of an active liquid.

Abstract: The light guide apparatus will guide a beam whose rays have a predetermined phase space distribution with a maximum deviation angle .theta..sub.max in a first plane perpendicular to the beam axis. The guiding apparatus includes an optical system positioned at a distance l/2 from the first plane for receiving light from the edge of the spreading beam along an edge of width l tan .theta..sub.max and for diverting the light towards the beam axis to reproduce the predetermined spatial distribution in a second plane perpendicular to the beam axis at a distance l from the first plane. The optical system can be made from annular or cylindrical, regular or fresnel lenses. A number of systems may be sequentially mounted to guide a beam along any desired distance with in a straight line or perpendicular to its original direction.

Abstract: The joule melter has an outer cylindrical electrode which forms the outer wall of the melt containment, an inner cylindrical electrode which protrudes upward in the containment and forms the outlet for the melt, thus, also determining the depth of the melt. A non-conducting sealing material forms a base plug between the electrodes. A cylindrical electrically conductive baffle is located between the electrodes and includes an opening which allows the melt to flow from near the outer electrode where the melt material is first inserted into the melter, to the inner electrode which is the outlet. In addition to the inner and outer electrodes, the baffle may be connected to a power supply to modify the currents flowing at each of the electrodes.

Abstract: The antenna feed includes a waveguide radiator with a conductive flange positioned about the waveguide near its radiating end. The flange includes one or more corrugations which each have tapered walls and which is truncated at its root and crest by a flat or curved plane. The corrugations thus may have a trapezoidal cross-section or a curved root and crest cross-section. The curvature may be sinusoidal.

Abstract: The luminaire for a prism light guide system consists of a longitudinal hollow structure made of transparent dielectric material. The structure has inner and outer surfaces which are in octature, and at least a portion of one outer surface that has a light release mechanism. The light release mechanisms include a non-planar surface, a rough outer surface, or round corners in a corrugated outer surface. The luminaire can further include a device positioned within the hollow structure for increasing the divergence angle .theta. of the light. It can consist of a diffusion screen or a mirror. Some of the walls may also be covered by a reflective material to redirect any escaping light back into them.

Abstract: Laser pulse generation techniques are disclosed in which two competing non-linear processes, e.g. stimulated Brillouin scattering and laser-induced breakdown are employed in combination to generate a short laser pulse. Narrow linewidth UV radiation amplified to the millijoule level in a XeCl discharge module has been used to generate pulses of less than 200 picoseconds in duration.

Abstract: Eddy current probes which are used to internally or externally inspect cylindrical components for localized defects have a main coil arrangement that induces and senses eddy current in the components. In accordance with the present invention, the probe further includes an element associated with the main coil arrangement to generate a detected defect signal distinct from a detected noise signal. The element can include one or more further coils mounted coaxially with the main coil arrangement so as to be between the main coil arrangement and the component to be inspected. The element may alternately be a cylindrical conductive sleeve mounted coaxially with the main coil arrangement so as to partially shield the coil arrangement from the component to be inspected. An electrical phase shifting network may be connected to the one or more further coils to enhance the distinction between the signals.

Abstract: The modal-insensitive coupler consists of a number N of optical multimode fiber lengths, each fiber length having a core of initial predetermined cross-sectional area. The fiber lengths are fused together in a coupling section such that the cores of the fiber lengths have a reduced cross-sectional area in the coupling section which supports a minimum number of modes of optical energy at a predetermined wavelength, and such that the fiber lengths have different core cross-sectional areas to produce preselected coupling ratios.

Abstract: The eye movement detector detects events occurring during the electro-oculogram (EOG) signal in which components of the signal having a predetermined rise time, are coincident with components of the same signal having a predetermined amplitude.

Abstract: An atomized cloud of droplets having an electric charge is generated wherein different discrete parts of the cloud are formed from different liquids. The discrete part of the cloud which has an active ingredient, such as a chemical insecticide or herbicide, is contained such as by enveloping it or directing it in a particular direction by a further discrete part of the cloud that includes an inert liquid such as water. The spraying apparatus comprises a plurality of nozzles positioned in a high velocity air stream to disperse liquid and generate an atomized cloud of the liquid. The nozzles are grouped into at least two sets, each set being arranged and positioned to generate a discrete part of the cloud. An electric charge is placed on the droplets as they are emitted. Each set of nozzles further include a liquid reservoir connected to the nozzles. Each reservoir is to contain a different liquid whether it be an inert liquid or different concentrations of an active liquid.

Abstract: The movement detector monitors the electroencephalogram (EEG) signal in order to detect components having a real-time frequency greater than 30 Hz and an amplitude greater than 18 .mu.V; a real-time frequency greater than 30 Hz and an amplitude between .+-.9 .mu.V; or a real-time frequency less than 1.2 Hz and an amplitude greater than 200 .mu.V. An output signal is provided when at least one of these components is detected.

Abstract: The purpose of the off-axis electron gun is to generate a beam of electrons and to deflect the beam onto the axis of a device which utilizes the beam. The off-axis electron gun includes an arcuate wire electron emitting source subtending an azimuthal angle of up to 125.degree., a non-intercepting azimuthally asymmetric focussing and deflecting electrode located at and around the electron source, and an anode plate with a beam exit hole. The non-intercepting electrode has an arcuate slot subtending a predetermined angle at a predetermined radius from the beam axis in which the arcuate wire electron source is mounted in electrical isolation from the electrode. The deflecting section of the electrode is azimuthally asymmetric in shape such that when selected voltages are applied between the wire source, the focussing and deflecting sections of the non-intercepting electrode and the anode, an electric field is produced which directs the electrons towards the axis, focusses the beam and deflects it onto the axis.

Abstract: The surface acoustic waves are generated by laser beam that is focussed onto a surface to irradiate it in an arcuate pattern as a partial annulus or as a still or moving fringe pattern. The arcuate pattern may be formed by a transmitting or a reflecting axicon, while the fringe pattern may be formed by splitting the laser beam into two beams and directing the two beams to the surface. In addition, a lens or a frequency shifting device may be placed in the path of one of the split beams to form a circular fringe or a moving fringe, respectively.

Abstract: The lighting panel has a first face for receiving light from a source and a second face. The panel includes a first and a second sheet of transparent dielectric material. Each sheet has a smooth surface on one side and is corrugated on the other side. The surfaces forming the corrugations intersect at 90.degree. the smooth surface on the first side is at 45.degree. to the surfaces of the corrugations on the other side of each sheet. The smooth surface of the first sheet forms the first face of the panel, the corrugated surface of the first sheet is adjacent to the smooth surface of the second sheet, with the direction of the corrugations on the second sheet set at a predetermined angle .alpha. to the direction of the corrugations on the first sheet. Light thus enters the smooth surface of the first sheet and emerges from the corrugated surface of the second sheet. The sheets may be substantially planar. At least one of the sheets may also include light release mechanisms. The angle .alpha.

Abstract: The multiple measuring control volume laser Doppler anemometer includes a laser for providing an optical beam. The beam is transformed by an optical arrangement to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi.. A detector collects the scattered light from the measuring control volumes in order to determine the velocity at each of the control volumes.

Abstract: A method and apparatus for rendering a high-voltage current-comparator capacitance bridge insensitive to frequency fluctuations when used for measuring inductance. A compensating current, proportional to twice the change in the current through the reference capacitor due to frequency fluctuations, is driven into the first comparator winding through which the current from the reference capacitor passes, resulting in a current in that winding having frequency characteristics similar to those of the current passing through the second winding which is connected to the inductance. This compensating current is derived from a reduced replica of the applied high-voltage by deriving a voltage signal which is a function of the frequency fluctuation, producing an amplitude controlled reduced replica voltage using the frequency fluctuation voltage and converting the amplitude controlled voltage to the compensating current for the first comparator winding.

Abstract: The antenna feed includes a waveguide radiator with a conductive flange positioned about the waveguide near its radiating end. A dielectric element is positioned about the waveguide between the flange and the radiating end and establishes the dielectric surface impedance seen by the waveguide. The dielectric element may consist of one or more layers of dielectric material to form a composite dielectric. One of the layers may be an air gap adjacent to the flange. The size and position of the flange and dielectric element will control the radiation pattern of the beam from the feed.