Patent ID: 7482968

Claim:
A detector for detecting embedded elongate objects ( 5 ), comprising an evaluating unit ( 6 ) having computing means ( 7 ) and an output device ( 8 ); a handheld measuring head ( 9 ) displaceable over a surface (F) and including a path detector ( 10 ), a transmitting-receiving unit ( 11 a ) with an antenna ( 12 a ); and at least one further antenna ( 12 b ) spaced from the antenna ( 12 a ) of the transmitting-receiving unit ( 11 a ) along the surface (F), by a distance (A) lying in a range from 5 cm and 50 cm; wherein the detector performs a measurement method of detecting the embedded elongate objects ( 5 ) in the surface (F) of a to-be-examined area, including: a first step (I) which is repeated multiple times and in which, a detector ( 1 ) senses a change in a position (Δx) of the measuring head ( 9 ) displaceable along a scanning direction over the to-be-examined surface (F), and receives separate measurement signals (A(x A ) B(x B )) from the at least two antennae ( 12 a , 12 b ), respectively, whose positions (x A , x B ) are associated with the separate measurement signals (A(x A ) B(x B )); a second step (II) performed by the computing means ( 7 ) in which separate measurement variables (A[A(x A ), x A ], B[B(x B ), x B ]), which contain possible embedded objects ( 5 ) that can be identified in the separate measurement signals (A(x A ) B(x B )), are determined from the separate measurement signals (A(x A ) B(x B )) using a predetermined A-scan algorithm, respectively; and a third step (III) in which the at least two separate measurement variables (A[A(x A ), x A ], B[B(x B ), x B ]) are calculated together by the computing means ( 7 ) to form a correlation measurement variable.