David E. Burchfield - Cucamonga CA, H. William Niu - Rowland Heights CA, Richard A. Heppner - Claremont CA,
H01J 49/40 B01D 59/44
250283, 250287, 250288
A DMS-IMS chemical sensing system employs two ion-separation technologies in tandem to extract signals of specific chemicals from the glut of signals present. The sensing system generally includes an atmospheric pressure ion generation system, a Differential Mobility (DMS) system, a time-of-flight IMS (TOF-IMS) system, and an ion detector system. The DMS extracts a narrow range of trace chemicals from an environmental sample for subsequent analysis, and a TOF-IMS then analyzes the resulting narrow range of isolated chemicals, allowing compound-specific detection thresholds at sub-ppb concentrations.
Bruce E. Mount - Diamond Bar CA David E. Burchfield - Rancho Cucamonga CA John M. Hagey - Alta Loma CA
Orbital Sciences Corporation - Dulles VA
A gas bubble detector having a modulated IR source focused through a bandpass filter onto a venturi, formed in a sample tube, to illuminate the venturi with modulated filtered IR to detect the presence of gas bubbles as small as 0. 01 cm or about 0. 004" in diameter in liquid flowing through the venturi. Means are provided to determine the size of any detected bubble and to provide an alarm in the absence of liquid in the sample tube.
Saw Vapor Sensor Apparatus And Multicomponent Signal Processing
Anatole Lokshin - Claremont CA David E. Burchfield - Rancho Cucamonga CA David H. Tracy - Norwalk CT
Orbital Sciences Corporation - Dulles VA
A method and apparatus for the identification and quantification of a vapor, or a number of vapors, in air mixtures is discussed. The method includes calibration of a vapor responsive sensor, or a plurality of vapor responsive sensors, to known concentrations of the vapors of interest or to known concentrations of potential interfering vapors. The calibrations result in sensor response vectors which are derived from the transient signals observed as the vapors are sorbed and desorbed on the sensors. Detection of vapors in complex mixtures is effected by subjecting the apparatus to the mixture and measuring the sensor response, or plurality of sensor responses, and then applying multidimensional statistical analysis or filtering methods to this data, using the precalibrated response vectors as the basis set for deconvolution. The sensors disclosed are Surface Acoustic Wave sensors (SAWs), and include variations of temperature programmed SAWs, SAWs with various combinations of chemically selective coatings, and arrays of temperature programmed and coated SAWs.
University Of Florida Neonatal 1600 SW Archer Rd, Gainesville, FL 32610 352-273-8985 (phone), 352-273-9054 (fax)
Medical School University of South Florida College of Medicine at Tampa Graduated: 1981
Abdominal Hernia Conditions of Pregnancy and Delivery Skin and Subcutaneous Infections
Dr. Burchfield graduated from the University of South Florida College of Medicine at Tampa in 1981. He works in Gainesville, FL and specializes in Neonatal-Perinatal Medicine. Dr. Burchfield is affiliated with Munroe HMA Hospital LLC and UF Health Shands Hospital.
Principal Research Scientist at Hamilton Sundstrand Space Systems
Greater Los Angeles Area
Defense & Space
Hamilton Sundstrand Space Systems - Pomona, CA since 1989
Principal Research Scientist
Hamilton Sundstrand May 1989 - Oct 2011
Manager, System Science
Bucknell University Aug 1983 - Apr 1989
Assistant Professor of Chemistry
Carnegie Mellon University 1977 - 1983
Ph.D., Physical Inorganic Chemistry
Merrimack College 1973 - 1977
Woburn Senior High School
Matlab Systems Engineering Engineering R&D Analytical Chemistry Testing Aerospace Product Development Science Sensors Program Management Chemistry Physics Software Engineering Inorganic Chemistry Earned Value Management Process Improvement Design of Experiments Materials Science Engineering Management Six Sigma Simulations Spectroscopy Research Manufacturing Embedded Systems Software Development Optics Space Systems Strategic Planning
Love hiking in the mountains behind our house. Still volunteer as a youth soccer referee - 21 years now.
"It confirms that if you don't do anything, these babies will not make it, and if you do something, some of them will make it," according to Dr. David Burchfield of the University of Florida. "Many who have survived have survived with severe handicaps."