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:
Dec. 03, 2019
Filed:
Aug. 14, 2017
Applicant:
Government of the United States of America, As Represented BY the Secretary of the Navy, Arlington, VA (US);
Inventor:
Geoffrey A. Cranch, Fairfax Station, VA (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01N 29/14 (2006.01); G01N 29/24 (2006.01); G01H 9/00 (2006.01); G01N 29/26 (2006.01);
U.S. Cl.
CPC ...
G01N 29/14 (2013.01); G01H 9/004 (2013.01); G01N 29/2418 (2013.01); G01N 29/2425 (2013.01); G01N 29/262 (2013.01); G01N 2291/014 (2013.01); G01N 2291/0258 (2013.01);
Abstract
A method of monitoring a structure for stresses or cracks. A single mode optical fiber is adhered to a structure. The single mode optical fiber includes a first optical cavity. The first optical cavity includes two fiber Bragg gratings with a distance therebetween. The first optical cavity includes a resonance. A frequency shift of the resonance of the first optical cavity is measured with a frequency discriminator. An acoustic emission from the structure is detected based on the frequency shift.