Nancy J Swanson

US Patent:

6704105, Mar 9, 2004

Filed:

Jul 18, 2001

Appl. No.:

09/909172

Inventors:

Nancy L. Swanson - Newburg MD
Barton D. Billard - Fredericksburg VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01N 1502

US Classification:

356336, 356342, 356335, 356337

Abstract:

A method for controlling both the scattering and absorption of electromagnetic waves. The method is based on prescribing the sizes of the particles that are suspended in a specified medium and a ratio of the refractive indices of the particles and the medium. This method can be used in applications that require maximizing or minimizing scattering of electromagnetic waves. The present method can also be used in applications that require maximizing or minimizing absorption of electromagnetic waves. Further, the invention provides control of backscattering (radar cross section) and, controlling any combination of scattering, absorption and backscattering of electromagnetic waves. Applications for the present method include stealth technology, friend or foe identification, and defensive screening.

US Patent:

6842242, Jan 11, 2005

Filed:

Nov 12, 2003

Appl. No.:

10/712387

Inventors:

Nancy L. Swanson - Newburg MD, US
Barton D. Billard - Fredericksburg VA, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01N 1502

US Classification:

356336, 356342, 356335, 356337

Abstract:

A method for controlling both the scattering and absorption of electromagnetic waves. The method is based on prescribing the sizes of the particles that are suspended in a specified medium and a ratio of the refractive indices of the particles and the medium. This method can be used in applications that require maximizing or minimizing scattering of electromagnetic waves. The present method can also be used in applications that require maximizing or minimizing absorption of electromagnetic waves. Further, the invention provides control of backscattering (radar cross section) and, controlling any combination of scattering, absorption and backscattering of electromagnetic waves. Applications for the present method include stealth technology, friend or foe identification, and defensive screening.

US Patent:

62191381, Apr 17, 2001

Filed:

Jan 10, 2000

Appl. No.:

9/480535

Inventors:

Nancy L. Swanson - Newburg MD
Barton D. Billard - Fredericksburg VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01N 1502

US Classification:

356336

Abstract:

The particle size within a given medium is determined using a single wavelength to confirm the known particles sizes within a dispersion, or determined from two wavelengths to calculate the unknown particle sizes of a dispersion. Three wavelengths may be used to determine the unknown particle size of a dispersion of unknown concentration within a medium. The method and apparatus may be used for mono-dispersions and poly-dispersions.