The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2005
Filed:
Jun. 28, 2002
Karen L. Sauer, Alexandria, VA (US);
Bryan H. Suits, Houghton, MI (US);
Joel B. Miller, Cheverly, MD (US);
Allen N. Garroway, Davidsonville, MD (US);
Young K. Lee, San Diego, CA (US);
Shouqin Huo, San Diego, CA (US);
Karen L. Sauer, Alexandria, VA (US);
Bryan H. Suits, Houghton, MI (US);
Joel B. Miller, Cheverly, MD (US);
Allen N. Garroway, Davidsonville, MD (US);
Young K. Lee, San Diego, CA (US);
Shouqin Huo, San Diego, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
This invention involves an apparatus to measure the nuclear quadrupole (NQR) response of a specimen using three frequencies. Three-frequency NQR involves excitation of at least two transitions that causes an observed signal at a third transition frequency. Thus, the transition excited and detected is not irradiated at all. This reduces undesirable interfering signals due to the excitation, for example as a result of acoustic ringing and/or tank circuit ring-down, since the excitation is not applied at the frequency that is detected. This invention will be particularly useful to detect substances selected from the group consisting of explosives and narcotics using nitrogen NQR.