标题：Experimental study on non-destructive testing of rock bolts based on pseudo-random signal
作者：Cheng Jiu-long;Sun Xiao-yun;Feng Li;Yuan Yong-bang
作者机构：State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing);School of Electrical
会议名称：1st International Symposium on Mine Safety Science and Engineering (ISMSSE)
会议日期：OCT 26-29, 2011
关键词：Pseudo-random signal;Rock bolts;Non-destructive testing;Correlation analysis
摘要：The quality of rock bolt anchoring is closely related to the stability and safety of underground engineering and slope protection. In this paper, non-destructive testing of rock bolts is proposed based on pseudorandom signal, owing to the deficiencies of the conventional detecting method of stress wave reflection. The characteristics of pseudo-random signal for non-destructive testing of rock bolts are introduced. And the rock bolts are tested in the experiment, the time of reflection wave is identified and the length of rock bolts is calculated through cross correlation analysis between the extracted wavelet signal and the test signal. It is proved that the testing results of non-destructive testing methods based on pseudo-random signal are of low deviation. The experiment has shown that non-destructive testing of rock bolts based on pseudo-random signal is feasible with high precision.