| 摘要 |
An electromagnetic proximity detection method for a buried structure (5/10), in particular an underground conduit or wiring at a construction site, executed with a mobile detection device (1), by the steps of sensing an electromagnetic field (7/12) emitted from the structure (5/10) as an analog electrical signal and digitalizing the analog electrical signal as a digital signal, is presented After or while filtering the analog and/or digital signal, a determining of the proximity of the buried structure by analysing the digital signal is executed, wherein the detection method can be alternatively executed in at least two of the following, in particular alternatively selectable, modes of detection:•Power-Mode of detection,•Radio-Mode of detection or•Active-Mode of detection. The method is characterized by an additional Switching-Mode of operation wherein a repeated sequential detection in at least two of the mentioned modes of detection is done by automatic subsequent alternating of the mode of detection with such a minimum rate of alternation that an area of detection (2) is coverable by the at least two modes of detection in a single execution of the detection method. |
