Apparatus for determining location of an element of magnetizable material in a construction structure
First Claim
1. Apparatus for determining a location of a magnetizable element in a construction structure, said apparatus comprising:
- a scanning head displaceable in a scanning direction and including a magnet for producing a magnetic field in the structure and having a bottom pole face adjacent to the surface of the structure along which the scanning head is displaceable;
at least one pair of magnetic field sensors secured in the region of the bottom pole face for measuring the magnetic field disturbed by the magnetizable element, the at least one pair of magnetic field sensors comprising a pair of field plates located on the bottom pole face, the field plates lying, in a spaced relationship relative to each other on a straight line extending parallel to the scanning direction during displacement of the scanning head;
a differential circuit connecting the field plates together for generating a differential measurement value in each scanning position of said scanning head;
means, associated with said differential circuit, for storing generated differential measurement values for all of the scanning positions of the scanning head during displacement of the scanning head along the entire displacement path thereof in the scanning direction; and
means, associated with said storing means, for determining a location of the magnetizable element wherein the determining means comprises means for processing the stored differential measurement values for determining a maximum of the stored differential measurement values, which defines the location of the magnetizable element.
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Accused Products
Abstract
An apparatus for locating magnetizable material (5, 6) within a structure (4) includes a scanning head (1) with a permanent magnet (28) for producing a magnetic field in the structure (4). Two field plates (30, 31), adjacent one another on only one pole face of the permanent magnet (28), are interconnected by a differential circuit and measure the magnetic field of the magnet disturbed by the magnetizable material (5, 6). The differential values measured by the pair of field plates form a differential measured signal for establishing, after differentiation, the location of the magnetizable material (5, 6) within the structure (4). The location of the magnetizable material (5, 6) within the structure can be shown on a monitor (7) of an evaluation unit (3).
51 Citations
14 Claims
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1. Apparatus for determining a location of a magnetizable element in a construction structure, said apparatus comprising:
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a scanning head displaceable in a scanning direction and including a magnet for producing a magnetic field in the structure and having a bottom pole face adjacent to the surface of the structure along which the scanning head is displaceable; at least one pair of magnetic field sensors secured in the region of the bottom pole face for measuring the magnetic field disturbed by the magnetizable element, the at least one pair of magnetic field sensors comprising a pair of field plates located on the bottom pole face, the field plates lying, in a spaced relationship relative to each other on a straight line extending parallel to the scanning direction during displacement of the scanning head; a differential circuit connecting the field plates together for generating a differential measurement value in each scanning position of said scanning head; means, associated with said differential circuit, for storing generated differential measurement values for all of the scanning positions of the scanning head during displacement of the scanning head along the entire displacement path thereof in the scanning direction; and means, associated with said storing means, for determining a location of the magnetizable element wherein the determining means comprises means for processing the stored differential measurement values for determining a maximum of the stored differential measurement values, which defines the location of the magnetizable element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification