Lehigh University

Yong W Kim

William A Frederick

Thomas William Harding

The present invention comprises a process for the removal of oxides of nitrogen and sulfur from a gas mixture containing those species by exposure of the gas mixture to ultraviolet radiation having a wavelength below 220 nanometers.

Lamp sheath assembly for optically-assisted gas decontamination process

The present invention comprises a process for the removal of oxides of nitrogen and sulfur from a gas mixture containing those species by exposure of the gas mixture to ultraviolet radiation having a wavelength below 200 nanometers in absence of ammonia.

Optically-assisted gas decontamination process

A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.

Transient spectroscopic method and apparatus for in-process analysis of

Apparatus which can be used for producing negative ions in a gaseous or liquid fluid is disclosed, as well as methods of using the apparatus to determine electron attachment parameters, to identify species in the fluid, or to separate selected species from the fluid. The apparatus comprises a photoelectron emitter, including a UV light source, which can be operated in pulsed or continuous modes, and a photocathode; in addition, a radially-spaced, coaxial negative ion collector, including a negative ion receiving plate, at least one of the photocathode and the receiving plate having cylindrical configuration.

Growing community of inventors

Bethlehem, PA, United States of America

Yong W Kim