基于农田土壤的超声波传播特性试验

超声波作为一种可靠的无损检测技术,是实现精准农业的重要手段。农田环境可能存在着小石块等异物,研究超声波在含石土壤中的传播特性有助于实现农田环境的精准监控。为此,以Biot模型为基础,建立了非饱和土壤环境下超声波的传播模型,并试验验证模型。以不同的土石成分、土石比例混合而成的岩土混合体作为传播试样,探究超声波在试样的声速、衰减系数等参数。试验以砂土、壤土为试验样土,以白玉石、刚玉圆球作为试验石块,结果表明:超声波声速与衰减系数与土石比例具有较好的相关性;随着土石混合体石块比例上升,声波均出现振幅减弱、声速下降的现象。

Experiment of Ultrasonic Propagation Characteristics Based on Farm Soil

Ultrasonic wave is one of the robust nondestructive testing technology,which play an important role in precision agriculture.There is some small stone in soil of farm,therefore ultrasonic test of mixture of soil and rock is helpful for monitoring the situation of soil.In this paper,we study on the sound velocity and attenuation coefficient of the ultrasonic wave in the rock and soil mixture.Fine sands and red loams were used as experimental soil,and white marble and corundum ball were used as experimental rocks.The experimental results show that the ultrasonic velocity and attenuation coefficient have a good correlation with the ratio of rock and soil.With the increase of rock mass ratio,the sound velocity and attenuation coefficient decreases.