Study on soil water distribution measurement using sound wave

探讨了声波成像法和高灵敏度激光多普勒测振仪测量浅层土壤水分分布的能力。从沙土和培养土的实验结果，证实了传播声速与体积含水量的相关性。此外，从使用容器进行屋顶种植的实验结果来看，当含水率差异的部分很浅时，我们证实了使用非接触式声成像方法进行可视化是可能的。

Examination about the ability of the water distribution measurement in very shallow soil to be performed by the acoustic imaging method using a sound wave and the laser Doppler vibrometer of high sensitivity was performed. From the experimental result using sand and culture soil, the relevance of propagation acoustic velocity and volume water content was confirmed. Moreover, from the experimental result using the container for roof planting, when the part where moisture content differs was very shallow, we confirmed that the visualization using the non-contact acoustic imaging method was possible.