Analysis of Ultrasonic Detection of Obstacles in Soil Based on Acoustic Spectrum Characteristics
In order to explore the detection effect of ultrasonic method on the obstacles in soil,an indoor experiment is designed by using the cohesive soil in an area of Shanghai as the medium.The influence of different factors on the ultrasonic detection effect is studied by changing the soil moisture content and ultrasonic detection distance.The experimental results are analyzed for the spectral characteristics by using Fourier transform.The spectral changes of the received signals are analyzed from three aspects of moisture content,detection distance and obstacle to investigate the effects of various influencing factors.The research results show that with the increase of moisture content,the degree of distortion in the received signal spectrum decreases,and the number of abrupt changes on the curve decreases.With the increase of detection distance,the degree of distortion in the received signal spectrum increases,and the number of abrupt changes on the curve increases.When the moisture content is low,the presence of obstacles has the negligible effects on the received signal spectrum.However,when the moisture content is high,the presence of obstacles can cause an increase in the degree of distortion in the received signal spectrum,which can be recognized from the spectrum analysis.
NETL
NSTL
万方数据
维普
