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| | Abstract | | In the noncontact acoustic inspection method using acoustic irradiation induced vibration and high-sensitivity LDV, there is a possibility that remote underground shallow underground exploration can be performed by using acoustic irradiation induced vibration from UAV. In this study, we conducted a basic study (measurable size and distance) for a shallow underground exploration technology by acoustic irradiation from UAV. In the experiment, a lightweight flat speaker that can be mounted on a UAV was placed on a fixed base, and the vibration velocity distribution was measured by LDV (sound source height 0.8 m, sound pressure about 93 dB). A hollow container was used as the buried object (the used soil was Kanto loam soil). From the experimental results, the detection of buried objects with a size of 100 mm to 300 mm was confirmed. Regarding the measurable distance, the vibration from the buried object could be confirmed even if the distance from the LDV was 20 m for the buried object with a depth of 50 mm. From these results, it became clear that long-range noncontact shallow subsurface exploration can be carried out by sonic irradiation from UAV. |
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