Apostolos C Raptis

6969851, Nov 29, 2005

Aug 18, 2004

10/920539

Apostolos C. Raptis - Downers Grove IL, US

The University of Chicago - Chicago IL

H01J049/26
G01N023/00

250288, 250286, 31323141, 31511121, 422 83, 436116

A sensor and detection methods are provided for detecting nitric oxides (NOx) in an exhaust gas based upon ion mobility spectrometry (IMS) technique. An ionization chamber having an interior electrically conductive shell receives exhaust gas. A spark electrode having a needle tip extends into the ionization chamber. A shutter grid is coupled between the ionization chamber and an ion drift tube. A substantially continuous spark discharge is established between the electrically conductive shell and the needle tip of the spark electrode for ionization of the exhaust gas. Negative NOions are kept inside the chamber by biasing the electrically conductive shell and the shutter grid at a negative voltage. Then a positive pulse is applied to the shutter grid to cause the shutter to open for negative NOions to exit into the ion drift tube. The IMS sensor is small-sized, low-cost, robust, and reliable.

7223608, May 29, 2007

Aug 8, 2003

10/637127

Nachappa Gopalsami - Naperville IL, US
Apostolos C. Raptis - Downers Grove IL, US

U Chicago Argonne LLC - Chicago IL

G01N 27/00

436149, 422 98, 422 8201

A dielectric sensing method and apparatus are provided for detection and classification of chemical and biological materials. Resonance patterns of a sample within a resonator are detected for identifying a shift in resonance frequency and a change of line width before and after introduction of the sample. The identified shift in resonance frequency and change of line width are used for determining a complex dielectric constant of the sample for the material detection and classification. A degree of selectivity at any excitation frequency is enabled for the dielectric sensing method from the manner in which the complex dielectric constant of a material affects the resonance pattern of the resonator with respect to shift in resonance frequency and the change in line width. By selecting the excitation frequencies to generally correspond to one of the resonance frequencies of the sample material under test, the degree of selectivity and the sensitivity of detection are enhanced.

7495218, Feb 24, 2009

Apr 20, 2006

11/407711

Nachappa Gopalsami - Argonne IL, US
Sasan Bakhtiari - Argonne IL, US
Apostolos C. Raptis - Argonne IL, US
Thomas W. Elmer - Willowbrook IL, US

U Chicago Argonne LLC - Chicago IL

G01J 5/00

2503361

Systems and methods for the passive measurement of spectral lines from the absorption or emission by polar molecules. The system includes mmW front-end assembly, back-end electronics, and data acquisition hardware and software was assembled. The method relates to methods for processing multi-channel radiometric data from passive mmW detection systems.

7644606, Jan 12, 2010

Jan 29, 2007

11/699146

Apostolos C. Raptis - Downers Grove IL, US

UChicago Argonne, LLC - Argonne IL

G01N 21/00
G01N 21/61

73 2402, 73 2406

A user-friendly photoacoustic spectroscopy (PAS) system and process (technique) provides an open-field PAS instrument, unit and device to remotely sense explosives, chemicals and biological agents. The PAS system and process can include: a pulsed tunable laser, such as a COlaser, a reflector, such as a parabolic reflector, an acoustic reverberant resonator in which a microphone is installed, and a data acquisition and analysis system.

7861574, Jan 4, 2011

Dec 4, 2009

12/631607

Apostolos C. Raptis - Downers Grove IL, US

UChicago Argonne, LLC - Argonne IL

G01N 21/00
G01N 21/61

73 2402, 73 2406

A user-friendly photoacoustic spectroscopy (PAS) system and process (technique) provides an open-field PAS instrument, unit and device to remotely sense explosives, chemicals and biological agents. The PAS system and process can include: a pulsed tunable laser, such as a COlaser, a reflector, such as a parabolic reflector, an acoustic reverberant resonator in which a microphone is installed, and a data acquisition and analysis system.

7888645, Feb 15, 2011

Feb 16, 2009

12/371871

Nachappa Gopalsami - Argonne IL, US
Sasan Bakhtiari - Argonne IL, US
Apostolos C. Raptis - Argonne IL, US
Thomas W. Elmer - Willowbrook IL, US

UChicago Argonne LLP - Chicago IL

G01J 5/00

2503361, 2503411

Systems and methods for the passive measurement of spectral lines from the absorption or emission by polar molecules. The system includes mmW front-end assembly, back-end electronics, and data acquisition hardware and software was assembled. The method relates to methods for processing multi-channel radiometric data from passive mmW detection systems.

8165682, Apr 24, 2012

Jul 31, 2006

11/496195

Nachappa Gopalsami - Naperville IL, US
Stanislav Kulikov - Sarov, RU
Ivan Osorio - Leawood KS, US
Apostolos C. Raptis - Downers Grove IL, US

Uchicago Argonne, LLC - Chicago IL

A61N 1/00
A61B 5/04
A61B 5/05

607 45, 607 21, 607 32, 607 76, 600378, 600412

A system and method for predicting and avoiding a seizure in a patient. The system and method includes use of an implanted surface acoustic wave probe and coupled RF antenna to monitor temperature of the patient's brain, critical changes in the temperature characteristic of a precursor to the seizure. The system can activate an implanted cooling unit which can avoid or minimize a seizure in the patient.

20100290063, Nov 18, 2010

Apr 29, 2010

12/770438

Sasan BAKHTIARI - Darien IL, US
Nachappa Gopalsami - Naperville IL, US
Thomas W. Elmer - Westmont IL, US
Apostolos C. Raptis - Downers Grove IL, US

G01B 11/14

356614

A millimeter wavelength (MMW) measurement system for remote detection of object characteristics and methods for detecting such characteristics. The MMW measurement system comprises a front-end and an optional signal conditioning component. The MMW front-end includes an oscillator, a transceiver portion, and an antenna for focusing a detection component comprising micrometer level wavelength electromagnetic radiation onto the object. A portion of the electromagnetic radiation reflected by the object is received by the MMW measurement system, which is indicative of a displacement of the object. The MMW system may be configured to detect micrometer level displacement of the object disposed tens of meters from the MMW measurement system. In various embodiments the object may be a natural object, including a human, and the displacement may be indicative of a heart rate and/or a respiratory function.