| 摘要 |
A sensor (1) for detecting vibrations, particularly seismic waves, which is constituted by a container (2), on an upper face (2a) of which there is a concave seat (3) that has a circular plan shape and can be closed in an upper region by means of a lid. On the bottom of the seat there is at least one first circuit (7), which is constituted by two tracks (7a, 7b), made of conducting material and arranged along mutually concentric circles, which are coaxial to the axis of the cavity and are kept mutually apart. The sensor further comprises a contact body (17) made of electrically conducting material, which is free to move along the bottom, the surface with which the contact body rests on the bottom being larger than the mutual distance between the tracks of the at least one pair of tracks.
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