David Wilson Norris

US Patent:

60145048, Jan 11, 2000

Filed:

Aug 27, 1996

Appl. No.:

8/703607

Inventors:

David C. Saine - Brea CA
Gerald E. Held - Santa Ana CA
David A. Norris - Brea CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01R 3102

US Classification:

39550003

Abstract:

Fault simulation apparatus 10 that simulates faults in a piece of equipment 12 coupled to a VME bus 11. A computer 30 generates user defined faults that are to be simulated and provides initialization data and control signals to VME fault insertion apparatus 20 coupled between the VME bus 11 and the piece of equipment 12. The VME fault insertion apparatus 20 comprises bus fault logic 15 interposed in request and acknowledgment signal lines and data lines, that intercepts normal bus data transmission, and inserts user-defined data into bus data that is transmitted to the equipment 12 to simulate failures therein in response to fault definition signals 23. A fault processor 16 receives initialization data and control signals from the computer 30, sets an address of the VME fault insertion apparatus 20, interprets received commands, outputs address select signals that decode the address lines, and outputs fault definition signals 23 to the bus fault logic 15 in response to the initialization data and control signals that define the fault that is to be simulated. Function select logic 13 decodes the address lines in response to the address select signals provided by the fault processor 16 that enables selected data paths through the bus fault logic 15. Using the present invention, a user can easily activate and deactivate simulated faults in the equipment 12.

US Patent:

43831710, May 10, 1983

Filed:

Nov 17, 1980

Appl. No.:

6/207135

Inventors:

Mahadeva P. Sinha - Temple City CA
Charles E. Giffin - Pasadena CA
David D. Norris - San Gabriel CA
Sheldon K. Friedlander - Pasadena CA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

B01D 5944

US Classification:

250282

Abstract:

A system is provided for analyzing the particles in aerosols, as in making air pollution studies, which enables the making of rapid chemical analyses of particles. The system includes an apparatus for producing a controlled stream of individual particles to be analyzed from an environment, and an apparatus for vaporizing and ionizing the particles while they move in free flight, for analysis by a mass spectrometer. The apparatus for producing a stream of particles includes a capillary tube through which the air with suspended particles moves, a skimmer device having a small opening spaced from an end of the capillary tube to receive particles passing through the tube, and a vacuum pump for pumping air out of the space between the tube and skimmer. The vacuum pump serves to remove much of the gas from around the particles, while also creating an inflow of air and particles through the capillary tube. The particles passing through the skimmer opening can be simultaneously vaporized and ionized while in free flight, by a laser beam of sufficient intensity that is directed across the path of the free flying particles.