Spectrum Analyses and Extracting Components of Ultrasonic Echo Signals

Abstract

On the basis of an analysis on ultrasonic signals collected by detecting type 6061 aluminum block and 60kg/m rail, a signal processing method is applied to separate echo signals from ultrasonic signal. Ultrasonic signals are extracted and analyzed based on the parameters such as sampling frequency, sampling time, band-pass width and so on, in the experiments. Then, on the time domain, the frequency analysis is carried out in the target frequency range from ultrasonic signal and the characteristic frequencies are obtained. Finally, the digital filter is designed to reduce noise in order to contrast and analysis. The experimental results indicate that noise signals are effectively suppressed in the ultrasonic signals and echo signals are obtained clearly.