Abstract: A combined type buried object detection sensor is provided, in which a MD and a GPR are integrated to improve a detectivity. A buried object detection sensor 10 has a constitution in which plural antenna elements composing a GPR 14 are disposed on a circumference, an inner coil 16 of a MD 12 is arranged at a center portion of the GPR 14 and an outer coil 18 of the MD 12 is arranged at a periphery of the GPR 14, the GPR 14 has slits 20 separating the respective antenna elements, and the slits 20 between adjacent antenna elements are connected by a metal leaf 36.

Abstract: A combined type buried object detection sensor is provided, in which a MD and a GPR are integrated to improve a detectivity. A buried object detection sensor 10 has a constitution in which plural antenna elements composing a GPR 14 are disposed on a circumference, an inner coil 16 of a MD 12 is arranged at a center portion of the GPR 14 and an outer coil 18 of the MD 12 is arranged at a periphery of the GPR 14, the GPR 14 has slits 20 separating the respective antenna elements, and the slits 20 between adjacent antenna elements are connected by a metal leaf 36.

Abstract: A method of inspection of structures in which a hammer capable of imparting a non-destructive impact to an object to be inspected and provided with a pressure sensor or an acceleration sensor is hit against the object and, from a signal then put out, a processed signal of the time during which the hammer is in contact with the object or of the waveform signal during such time is displayed, apparatus provided with a signal processing device for the measurement of the above time, and apparatus provided with a device for removing an impact driving force responsive to a signal put out when the hammer contacts the object, for the measurement.