| 摘要 |
An apparatus to locate points situated on opposite sides of a structural barrier comprises a transmitter (10) emitting electromagnetic waves in an axis symmetrical field in such way that the field symmetry axis (9) enters the structural barrier through a point of origin (4) at the structural barrier first surface and perpendicular hereto, and a locating receiver (20) comprising at least two receiver antennas (21, 23). The transmitter is arranged temporarily fixed on the given location at the point origin and powered, while an operator moves the receiver, watching an indicator unit (28) connected to the receiver antennas, said indicator unit showing when the receiver antenna is located exactly at the axis of the field emitted. The invention also defines a method corresponding to the apparatus described. |
