Comparative compensation method for environmental noise of concrete beam coda wave
In order to promote the application of ultrasonic coda wave technology in the detection of concrete structures,the feature noise of ultrasonic coda wave of concrete beam caused by environmental interference was studied and the noise compensation method was proposed in this paper.The ultrasonic test of concrete beam in natural environment was carried out,and the multi-feature algo-rithm for the translation stretching rotation was proposed.The velocity,frequency and amplitude features of the coda wave were ana-lyzed in terms of time translation,time stretching and vector rotation.Through the ultrasonic contrast test of two samples,the coda wave environmental noise was compensated,and the noise reduction result of the coda wave interferometry signal was compared to verify the effectiveness of this method.The results show that temperature is the main source of coda wave environmental noise,while humidity is the secondary one.The noise reduction effect of this method on coda wave can reach more than 91%,which is sig-nificantly better than that of coda wave interferometry.By comparing the feature parameters of the specimen,the noise compensa-tion level can reach 90%.The findings of this paper provides research methods and experimental basis for improving the stability of coda wave.
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