Other

General Electric Company

The University of Texas System

Wisconsin Alumni Research Foundation

James E Lawler

Joseph Darryl Michael

Timothy John Sommerer

David John Smith

Steven Charles Aceto

Mark G Raizen

William A Fitzsimmons

Jason Fredrick Trotter

Heidi M Anderson

Jeffrey MacDonagh-Dumler

John J Curry

Kirk Ernest Marquard

William Nicholas Guy Hitchon

A gas switch includes an anode and a cathode spaced apart from the anode, wherein the cathode includes a conduction surface. The gas switch also includes a plurality of magnets arranged to generate a magnetic field that defines an annular path over a portion of the conduction surface at a radial distance from a switch axis, and a control grid positioned between the anode and the cathode. In operation, the control grid is arranged to establish a conducting plasma between the anode and the cathode, wherein, in the presence of the conducting plasma, a voltage drop between the anode and the cathode is less than 150 volts, and wherein the conducting plasma forms a cathode spot that circles the annular path.

Low voltage drop, cross-field, gas switch and method of operation

Described herein is a mercury sample that has an isotopic composition that differs from the naturally occurring distribution of isotopes. In various configurations of an isotopically tailored mercury sample, the fraction of one or more isotopes is increased or decreased with respect to the natural fraction(s). A example of a lighting device comprises an envelope, a buffer gas enclosed within the envelope, a isotopically tailored sample of mercury vapor, and a current injection mechanism configured to excite the mercury vapor to emit light. In various configurations, the lighting device emits radiation at a wavelength of 254 nm and/or at a wavelength of 185 nm. In various configurations, the lighting device envelope includes a fluorescent coating that is excited by ultraviolet (UV) light emitted by the mercury vapor. In various configurations, the lighting device provides improved efficiency as compared to lamps employing mercury with a naturally occurring isotope distribution.

Compositions of mercury isotopes for lighting

Visible light emission is obtained from a plasma containing elemental barium including neutral barium atoms and barium ion species. Neutral barium provides a strong green light emission in the center of the visible spectrum with a highly efficient conversion of electrical energy into visible light. By the selective excitation of barium ionic species, emission of visible light at longer and shorter wavelengths can be obtained simultaneously with the green emission from neutral barium, effectively providing light that is visually perceived as white. A discharge vessel contains the elemental barium and a buffer gas fill therein, and a discharge inducer is utilized to induce a desired discharge temperature and barium vapor pressure therein to produce from the barium vapor a visible light emission. The discharge can be induced utilizing a glow discharge between electrodes in the discharge vessel as well as by inductively or capacitively coupling RF energy into the plasma within the discharge vessel.

Barium light source method and apparatus

A device particularly suited for use in optics, having a planar sine plate mounted for rotation about a lateral axis, with the sine plate being capable of holding an optical device such as a diffraction grating. A pivot arm member is mounted for rotation about an axis perpendicular to the axis of rotation of the sine plate, and is in contact with the end of the plate over a portion of its rotational displacement. A calibrated drive such as a micrometer is mounted in position to make contact with the pivot arm near the end thereof, to drive the pivot arm inwardly and outwardly a determinable longitudinal distance. The distance that the pivot arm is driven by the micrometer is related to the angle of the plate as it rotates in contact with the pivot arm. Means are provided for minimizing frictional resistance at the contact between the pivot arm and the plate and between the pivot arm and the drive member of the micrometer.

Device for determining angles

Growing community of inventors

Madison, WI, United States of America

James E Lawler