Richard Albert Copeland

US Patent:

8129676, Mar 6, 2012

Filed:

Dec 17, 2007

Appl. No.:

12/448795

Inventors:

Michael Vestel - San Francisco CA, US
Caterina Netti - Glasgow, GB
Erkinjon Nazarov - Lexington MA, US
Gareth S. Dobson - Burlingame CA, US
Stephen L. Coy - Wayland MA, US
Richard Copeland - Palo Alto CA, US
Michael Coggiola - Sunnyvale CA, US
Lawrence Dubois - Danbury CT, US
Alexander Hallock - Redwood City CA, US
Joseph R. Stetter - Hayward CA, US

Assignee:

SRI International - Menlo Park CA
DH Technologies Development Pte. Ltd. - Singapore
Renishaw Diagnostics Limited - Glasgow

International Classification:

B01D 59/44
H01J 49/40
H01J 49/16

US Classification:

250288, 250281, 250282, 250286, 250287, 250423 R, 250424

Abstract:

Detecting and identifying ions using surface enhanced Raman spectroscopy (SERS) and an ion separation pre-filter, such as an ion spectrometer, are provided. The combination of an ion separator as a pre-filter for SERS provides a highly sensitive detector with very low false alarm rates. Target ions from an ionized sample are identified and separated by the ion separator. The target ions are steered and deposited onto a SERS substrate for Raman spectroscopic analysis with an optical probe. The Raman spectrum is compared with reference spectra and the composition of the sample is identified. The ion current from the target ions can also be measured, preferably concurrently with the Raman spectrum measurement. Types of ion separators include a differential ion mobility spectrometer, an ion mobility spectrometer, or a mass spectrometer.

US Patent:

60114746, Jan 4, 2000

Filed:

Apr 28, 1998

Appl. No.:

9/067333

Inventors:

Kevin R. Coffey - Fremont CA
Wing K. Ho - Boynton Beach FL
Richard L. Copeland - Boca Raton FL

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 1314

US Classification:

3405723

Abstract:

A single deactivation device is used to deactivate both harmonic type EAS markers and magnetomechanical type EAS markers. The deactivation device includes a housing, and a permanent magnet and a coil disposed within the housing. The coil is circular and is arranged concentrically with, and outside of, the permanent magnet. The permanent magnet forms a DC magnetic field for deactivating the harmonic type marker by magnetizing control elements thereof. The coil is driven to generate an AC magnetic field that deactivates the magnetomechanical type marker by degaussing a control element thereof. The maximum amplitude of the AC magnetic field is lower than the level of the DC magnetic field, and is substantially below the coercivity of the control elements of the harmonic type marker. The coercivity of the control element of the magnetomechanical type marker is low enough to be degaussed by the AC magnetic field.