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:
Apr. 04, 2023
Filed:
Aug. 16, 2017
Applicant:
National Research Council of Canada, Ottawa, CA;
Inventors:
Assignee:
National Research Council of Canada, Ottawa, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D 21/02 (2006.01); G01N 29/07 (2006.01); G01M 5/00 (2006.01); G01N 29/32 (2006.01); G01L 5/00 (2006.01); G01N 3/00 (2006.01); G01N 3/02 (2006.01);
U.S. Cl.
CPC ...
E21D 21/02 (2013.01); G01L 5/0004 (2013.01); G01M 5/0041 (2013.01); G01N 3/00 (2013.01); G01N 3/02 (2013.01); G01N 29/07 (2013.01); G01N 29/326 (2013.01); G01N 2203/0055 (2013.01); G01N 2291/011 (2013.01); G01N 2291/0232 (2013.01); G01N 2291/0258 (2013.01); G01N 2291/0421 (2013.01); G01N 2291/0422 (2013.01);
Abstract
A methods and systems for determining a change in condition of a rock bolt. Some methods may comprise, at a first point in time, propagating shear and longitudinal ultrasonic waves along the rock bolt to measure a first time of flight for each of the shear and longitudinal waves, at a second point in time after the first point in time, propagating shear and longitudinal ultrasonic waves along the rock bolt to measure a second time of flight for each of the shear and longitudinal waves, and using the relative changes of the first and second time of flights, determining the change in condition of the rock bolt section.