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1. (WO2017153213) SCANNING DETECTOR AND CONTROL METHOD

Pub. No.:    WO/2017/153213    International Application No.:    PCT/EP2017/054698
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Mar 02 00:59:59 CET 2017
IPC: G01V 3/10
Applicants: HILTI AKTIENGESELLSCHAFT
Inventors: ABU ANTOUN, Chafic
Title: SCANNING DETECTOR AND CONTROL METHOD
Abstract:
The scanning detector (1) is designed to detect and to identify first structures (2) only made of iron-based objects (7) and second structures (6) comprising iron-based objects (7) and non-magnetic and highly conductive metallic objects (8). The structures are below a surface, for instance embedded in masonry. A movement sensor (13) determines a movement of the scanning detector (1) along a measuring-direction (9). A field-sensor (13) comprises a pair of primary pickup-coils (24, 25) along the measuring-direction (9) and an excitation-coil arrangement (22, 23) arranged between the primary pickup-coils (24, 25). A current source (31) injects an alternating excitation-current (33) in the excitation-coil arrangement (22, 23). Thus, the excitation-coils are emitting a corresponding alternating magnetic field. A phase-analyser (38) determines a phase (phi) between the alternating excitation-current (33) and a difference (36) of induced voltage-signal (34 in the primary pickup-coils (24, 25). An interpretation unit (17) determines a slope of the phase (phi). The interpretation unit (17) identifies a structure by discriminating among the first structures (2) and the second structures (6) based on whether the slope is increasing or decreasing. A display (18) or a transceiver (20) is used to inform the user about the identified structure.