The Study Of The Ultrasonic Wave Applied In The Nondestructive Test Of The Defect Detection

This paper discusses ultrasonic wave nondestructive test in details for the first time, then it introduces the basic principles of the ultrasonic test and the features of ultrasonic wave spreading among concrete medium,Validate in the text the accuracy of the concrete ultrasonic wave nondestructive test by way of physical experiments. Through the data analysis, we can estimate and analyze well the sound can be better judged and analysis of concrete properties, amplitude and frequency can be used as supplementary meansof. The text introduced that statistical methods and PSD as the fashion of defect testing. By means of the relation between the nature, degree, ranges of defect and PSD criteria, Set up in the text an expression formula of critical criterion, at the time of several kinds of defects an fault, cavity , and the honeycomb or the cavity clogged by other medium, etc. through critical judging value and relational expression between the sizes of various kinds of defects and criteria value, with the comparison between them and their real calculated value.Though the expression using the data of test judged the defect between the two different model. Then propose using the multi-factor criterion method (NFP) integrated voice, amplitude and frequency as a parameter to determine the defect, acquired good experimental results. Though experimental simulation of bored on the measurement method determination of crack depth. That is better if using amplitude as the criterion for detecting of crack depth.Based on the character of wavelet transform theory, the impact-echo method is used to detect cracks. The collected signal is analyzed by the wavelet transform. The characteristic information of cracks is picked out. The investigation indicates that the application of wavelet analysis to the cracks faults detecting can make the fault character more clear. Though the impurity-free of impurities and containing two types of experimental results show that, wavelet transform theory has been applied to crack detection, and better identification of analysis of crack.. Error rate can be controlled at below 5%.Ultimately, the features and existing problem of ultrasonic wave nondestructive test. Furthermore, talk about the problem that need study more.