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1. (WO2018032106) METHODS AND SYSTEMS FOR ULTRASONIC ROCK BOLT CONDITION MONITORING

Pub. No.:    WO/2018/032106    International Application No.:    PCT/CA2017/050972
Publication Date: Fri Feb 23 00:59:59 CET 2018 International Filing Date: Thu Aug 17 01:59:59 CEST 2017
IPC: G01N 29/07
E21D 21/00
E21D 21/02
G01B 17/04
G01L 5/00
G01N 3/00
Applicants: NATIONAL RESEARCH COUNCIL OF CANADA
Inventors: SUN, Zhigang
WU, Kuo-Ting
KRÜGER, Silvio Elton
ROCHELEAU, David
QUENNEVILLE, Yves
Title: METHODS AND SYSTEMS FOR ULTRASONIC ROCK BOLT CONDITION MONITORING
Abstract:
A methods and systems for determining a change in condition of a rock bolt are disclosed. 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, and 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.A temperature correction value is also determined. The first and second time of flights and the temperature correction value are used to calculate a temperature-corrected relative change between the first and second time of flights for each of the shear and longitudinal ultrasonic waves at the first and second points in time. Using the temperature-corrected relative changes of the first and second time of flights to determine the change in condition of the rock bolt.