Christopher Aaron Klug

US Patent:

H002177, Jan 2, 2007

Filed:

Aug 8, 2003

Appl. No.:

10/637079

Inventors:

Karen L. Sauer - Alexandria VA, US
Christopher A. Klug - Alexandria VA, US
Allen Garroway - Davidsonville MD, US
Joel B. Miller - Cheverly MD, US

Assignee:

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

International Classification:

G01V 3/00

US Classification:

324318

Abstract:

A magnetic resonance detection apparatus is provided that is not susceptible to acoustic ringing, and a method is provided for eliminating or canceling acoustic ringing from a detected magnetic resonance signal. Specifically, a composite pulse is utilized that allows for both efficient reduction of acoustic ringing signals and the detection of true NQR signals. The composite pulse can be used in any of the common NQR pulse sequences currently utilized simply via substitution of the original single pulses with the composite pulse. Furthermore, although a preferred application involves the spin-1 nucleus N and NQR, the composite pulse will be useful for the NQR of other nuclei such as CI and K and in NMR applications and involving half-integer quadrupolar nuclei and spin- 1/2 nuclei. In addition, coil ringdown and piezoelectric ringing are also substantially reduced.

US Patent:

7791342, Sep 7, 2010

Filed:

May 16, 2008

Appl. No.:

12/153317

Inventors:

Karen L. Sauer - Fairfax VA, US
Christopher A. Klug - Falls Church VA, US
Joel B. Miller - Cheverly MD, US

International Classification:

G01V 3/00

US Classification:

324309

Abstract:

A device for detecting a class of target species containing quadrupolar nuclei in a specimen by nuclear quadrupole resonance, comprising a pulse generator for generating a three-pulse-composite-pulse to refocus signals that were excited by another pulse, an irradiator for irradiating a specimen with the three-pulse-composite-pulse, a detector for detecting an NQR signal in response to irradiating the specimen, a coupler for transmitting the three-pulse-composite-pulse to the irradiating means, and a transformer for converting the free induction decay signal into a frequency domain signal. A method for detecting a class of target species containing quadrupolar nuclei in a specimen by nuclear quadrupole resonance, comprising generating a three-pulse-composite-pulse, irradiating said specimen with said three-pulse-composite-pulse, detecting an NQR signal in response to irradiating said specimen and converting said free induction decay signal into a frequency domain signal.