Jennifer Lee Michaels

US Patent:

8406082, Mar 26, 2013

Filed:

Jan 19, 2007

Appl. No.:

12/523622

Inventors:

Jennifer Michaels - Tucker GA, US
Thomas Michaels - Tucker GA, US
Gisele Bennett - Atlanta GA, US

Assignee:

Georgia Tech Research Corporation - Atlanta GA

International Classification:

G01S 15/00

US Classification:

367 96

Abstract:

A structure intrusion may be determined. For example, a signal may be received corresponding to a wave propagating in the structure. Next, the received signal may be analyzed. Based on the analysis in a “passive mode”, a breach may be determined to have occurred in the structure when the received signal indicates that at least one aspect of the received signal crosses a predetermined threshold. Furthermore, based on the analysis in an “active mode”, a breach may be determined to have occurred in the structure when comparing the received signal to a baseline waveform indicates that at least one aspect of the received signal varies from the baseline waveform by a predetermined amount. The wave propagating in the structure may comprise an elastic wave and may be in an acoustic frequency range or in an ultrasonic frequency range.

US Patent:

20100265069, Oct 21, 2010

Filed:

Jan 19, 2007

Appl. No.:

12/523614

Inventors:

Thomas Michaels - Tucker GA, US
Jennifer Michaels - Tucker GA, US

Assignee:

Georgia Tech Research Corporation - Atlanta GA

International Classification:

G08B 13/22

US Classification:

3405723

Abstract:

A structure breach may be determined. A sensor, provided in the structure, may be driven with a constant frequency signal. The sensor may comprise a first conductive element and a second conductive element. The first conductive element may be substantially parallel with the second conductive element. A standing wave pattern may be induced on the sensor by the constant frequency signal reflecting off a termination point of the sensor. A least one characteristic of the sensor caused by the voltage standing wave pattern may be measured. A breach occurrence in the structure may be determined when the measured at least one characteristic varies from a previously determined value by a predetermined amount. The first conductive element and the second conductive element may be sandwiched between two layers comprising the structure. The structure may comprise a shipping container floor. The detected breach may comprise an opening greater than nine square inches.

US Patent:

20150160169, Jun 11, 2015

Filed:

Jan 25, 2013

Appl. No.:

14/396373

Inventors:

- Kissimmee FL, US
Jennifer Emmons Michaels - Tucker GA, US

Assignee:

HIDDEN SOLUTIONS LLC - Orlando FL

International Classification:

G01N 29/44
G01N 29/04
G01M 7/02

Abstract:

A method and system of detecting, localizing, and characterizing a defect at one or more spatial points of interest on a structure. The method may include collecting first data in a first state using one or more transducers on the structure, collecting second data in a second state subsequent to the first state, computing a scattered impulse response based on the collected first data and the collected second data, comparing the scattered impulse response with an estimated scattered impulse response corresponding to the case when damage is present at one or more spatial points of interest on the structure, and combining the generated comparison results to detect, localize, and characterize a defect at the one or more spatial points of interest on the structure.

US Patent:

20150106037, Apr 16, 2015

Filed:

Mar 14, 2013

Appl. No.:

14/396375

Inventors:

- Kissimmee FL, US
Jennifer Emmons Michaels - Tucker GA, US

International Classification:

G01N 29/36
G01N 29/34
G01N 29/04

US Classification:

702 39

Abstract:

A method and system for passively detecting, localizing, and/or characterizing a mechanical wave source at one or more spatial points of interest on a structure using ultrasonic guided waves are provided. The method includes estimating the spatial channel impulse response at one or more spatial points of interest using a movable transducer. Collected data recorded in response to transient mechanical waves is then combined with the spatial channel impulse response estimates to detect, localize, and/or characterize the source. A direct path from the mechanical wave source to each transducer is not required. Anisotropies and variations between transducer transfer functions may be accounted for and all propagation paths may be used to perform source localization. The method and system may leverage structural complexity rather than ignore it.