Paul M Gammell

49222015, May 1, 1990

Jan 9, 1989

7/294622

Susan N. Vernon - Annandale VA
Paul M. Gammell - Silver Spring MD

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

G01N 2772
G01R 2702
G01R 3312

324236

This invention relates to a method and device for measuring the resistivity f materials. In particular, the methods measure resistivity in carbon fiber reinforced composites as well as any materials with a relative magnetic permeability of 1. The measurement may be made with access restricted to a single side of the material under test.

54365651, Jul 25, 1995

Sep 14, 1992

7/944602

Paul M. Gammell - Silver Spring MD

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

G01R 2726

324679

Conductive measuring electrodes, of a capacitive probe having a grounded rd electrode positioned therebetween shield a probe circuit, provides mutual capacitance measurements which way as a function of changes in impedance of dielectric material being monitored as it undergoes a curing process. The probe is positioned in non-embedded relation to the dielectric material to form a sensitivity region therein through which an electric field extends between the conductive measuring electrodes of the probe to establish said variable mutual capacitance measurements without extraneous influences.

55325890, Jul 2, 1996

May 24, 1995

8/450774

Paul M. Gammell - Silver Spring MD

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

G01N 2782
G01N 1700
G01N 2772

324228

A magnetic field generator positioned externally of a non-ferrous metallic tructure being examined, is rotated at a relatively low speed to produce a rotating magnetic field penetrating the metallic structure to a selected depth as a function of spacing between magnetic poles of the generator parallel to a planar surface of the metallic structure. Traction between the metallic structure and the magnetic field accompanying its rotation is measured. Corrosion of the metallic structure at subsurface depths is detected and quantified from such traction measurements.

50883275, Feb 18, 1992

May 17, 1990

7/524414

Paul M. Gammell - Silver Spring MD

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

G01N 2904

73588

Acoustical radiation is generated and applied to the bonding interface between a radiation transmission material and a radiation attenuating material to determine adhesion quality by extraction of data from a response signal produced by echoes reflected from both the interface and the radiation entry surface on the radiation transmissive material exposed to the generated acoustical radiation. Signal phase cancellation between the echoes from the entry surface and bonding interface produce a signal signature from which the quality of bonding is evaluated. By partial attenuation of the echo from the entry surface, the signature is maximized.

49241826, May 8, 1990

Jan 9, 1989

7/294621

Susan N. Vernon - Annandale VA
Paul M. Gammell - Silver Spring MD

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

G01N 2787
G01N 2790

324237

This invention relates to a method for nondestructive inspection (NDI) of mposite materials comprising conductive fibers. The depth of broken fiber damage in nonmetal matrix composites such as graphite/epoxy and carbon/carbon materials may be ascertained and eddy current inspection is extended to include thick metal sections by this method. Inspection is possible with access limited to a single surface.

50217380, Jun 4, 1991

Mar 26, 1990

7/498883

Susan N. Vernon - Annandale VA
Brian Sircus - Silver Spring MD
Paul M. Gammell - Silver Spring MD

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

G01N 2772
G01N 2782
G01R 3312

324232

A compound eddy current probe comprising a nest of concentric ferrite cup re probes. Both the inner and outer radii of the activated coil can be selectively altered by operator or automatic program to correspond with the size and thickness of the material under test.

20180113205, Apr 26, 2018

Oct 25, 2017

15/793969

- Fairfax VA, US
Parag Chitnis - Fairfax VA, US
Nima Akhlaghi - Sterling VA, US
Elizabeth Tarbox - Nokesville VA, US
Paul Otto - Lorton VA, US
Paul Gammell - Exmore VA, US

G01S 7/52
G01N 29/06
G01N 29/26
G01S 15/89
A61B 8/00

Methods, systems, and apparatuses are disclosed for ultrasound imaging comprising Time Delay Spectrometry. A frequency swept signal can be transmitted through a medium, such as human tissue. The signal can be a low-voltage signal (e.g., 0 volts to 5 volts peak-to-peak) transmitted for long duration (e.g., 20 milliseconds) at various frequencies. As the signal propagates through the medium it can be reflected and delayed. A delay associated with the signal the can cause a change in the associated frequencies. The signal can be filtered to retain only frequencies in an audio frequency range. The signal can be beamformed and processed to produce an image.