Abstract: A plasma torch employs a dielectric resonator excited at separate locations with phase shifted signals to provide more uniform current flow through the resonator. High-power operation is possible while protecting the dielectric by using a combination segregated spiral flow and linear flow cooling air at different rates. Microwave leakage from the plasma resonant chamber is contained by conductive metal chokes.

Abstract: A portable, optical spectrometer provides an extended ignition arc allowing high-voltage components to be contained within a protective housing. Automatic plasma initiation is managed through an optical plasma detector distinguishing plasma contained in the plasma region from breakout plasma. A negative pressure vent receives gases received from the plasma and cools these gases prior to receipt by a remote vent fan through a conduit having sheathing air bleed openings around the vent mixing with other cooling air streams for the electronics. A spring-biased sample jet tube holder allows ready removal and replacement of the sample jet tube while preserving proper alignment with the plasma region.

Abstract: A plasma torch employs a dielectric resonator excited at separate locations with phase shifted signals to provide more uniform current flow through the resonator. High-power operation is possible while protecting the dielectric by using a combination segregated spiral flow and linear flow cooling air at different rates. Microwave leakage from the plasma resonant chamber is contained by conductive metal chokes.

Abstract: A portable, modular plasma source allows the production of an emission spectrometer by combination with a common portable fiber optic spectrograph by channeling emitted light through a fiber optic coupling communicating light from the plasma source to the portable fiber optic spectrograph.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used as a desolvator, atomizer excitation source and ionization source in an optical spectrometer or a mass spectrometer.

Abstract: A plasma unit for a mass spectroscopy machine generates plasma using a microwave coupled dielectric ring held within a microwave cavity employing part of the mass spectrometer structure to define the microwave cavity, thereby permitting improved proximity of the plasma and plasma ionized sample material to the mass spectrometer aperture.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used as a desolvator, atomizer excitation source and ionization source in an optical spectrometer or a mass spectrometer.

Abstract: A plasma unit for a mass spectroscopy machine generates plasma using a microwave coupled dielectric ring held within a microwave cavity employing part of the mass spectrometer structure to define the microwave cavity, thereby permitting improved proximity of the plasma and plasma ionized sample material to the mass spectrometer aperture.

Abstract: A portable, modular plasma source allows the production of an emission spectrometer by combination with a common portable fiber optic spectrograph by channeling emitted light through a fiber optic coupling communicating light from the plasma source to the portable fiber optic spectrograph.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used in a optical or mass spectrometer.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used in a optical or mass spectrometer.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce highly uniform electric field for the generation of plasma. The plasma may be used optical or mass spectrometer.

Abstract: A compact and versatile power meter is created through the use of a discrete component network providing for phased splitting and combining of signals obtained at taps along a transmission conduit having a predefined phase separation. The use of the discrete component network eliminates the need for bulky waveguides or microstrip antenna designs, the latter providing phase shift through their physical dimensions.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used as a desolvator, atomizer excitation source and ionization source in an optical spectrometer or a mass spectrometer.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce highly uniform electric field for the generation of plasma. The plasma may be used optical or mass spectrometer.

Abstract: A compact and versatile power meter is created through the use of a discrete component network providing for phased splitting and combining of signals obtained at taps along a transmission conduit having a predefined phase separation. The use of the discrete component network eliminates the need for bulky waveguides or microstrip antenna designs, the latter providing phase shift through their physical dimensions.

Abstract: A coil for magnetic resonance imaging operates in a transmit mode with multiple loops locked together in a phase relationship like a birdcage coil to provide a uniform transmission field, but in a receive mode like a phased array coil, each coil operating independently to produce a separate signal for reception by the MRI machine. Phasing of the coil during transmit mode is provided by a ring resonator controllably coupled to the loops. Controllable coupling is provided by a series of current limiting elements interposed between the resonant ring and the loops of the coil.

Abstract: A coil for magnetic resonance imaging operates in a transmit mode with multiple loops locked together in a phase relationship like a birdcage coil to provide a uniform transmission field, but in a receive mode like a phased array coil, each coil operating independently to produce a separate signal for reception by the MRI machine. Phasing of the coil during transmit mode is provided by a ring resonator controllably coupled to the loops. Controllable coupling is provided by a series of current limiting elements interposed between the resonant ring and the loops of the coil.

Abstract: A local coil for magnetic resonance imaging equipment employs mirror conductors on opposite sides of an insulating substrate to produce lower resistance, higher Q and improved signal-to-noise ratio for a given foil thickness.

Abstract: A cable routing system for an MRI coil having multiple loops and multiple signal cables provides a non-resonant conductive ring surrounding the loops and grounded to define a low electrical field region along which the signal cables may be routed for reduced interference.