19 April 2017 Time-frequency analysis of guided ultrasonic waves used for assessing integrity of rock bolts
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The purpose of this paper is to demonstrate application of the time-frequency analysis (TFA) for processing guided ultrasonic waves measured by means of a specially designed ultrasonic rock bolt tester during nondestructive inspection of rock bolts. A pulse-echo method is adopted in the instrument as the most appropriate for the in-field applications. This paper presents methods for analysis of the measured guided ultrasonic waves using the TFA. The proposed TFA methodology is first demonstrated on the simulated signals and then verified using the experimental signals gathered from grouted prepared rock bolts provided with artificial defects simulating grout discontinuities.
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Tadeusz Stepinski, Tadeusz Stepinski, } "Time-frequency analysis of guided ultrasonic waves used for assessing integrity of rock bolts", Proc. SPIE 10171, Smart Materials and Nondestructive Evaluation for Energy Systems 2017, 101710J (19 April 2017); doi: 10.1117/12.2263109; https://doi.org/10.1117/12.2263109


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