Sensor for locating metallic objects and method for evaluating measurement signal of such a sensor
First Claim
1. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) for inducing a flux and at least one reception conductor loop system (112, 212) for receiving said flux modified by a metallic object, wherein said at least one transmission coil (116, 216) and said at least one reception conductor loop system (112, 212) are inductively coupled to one another,wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200),wherein a second reception conductor loop system (114, 214) is provided for receiving said flux, wherein said second reception conductor loop system (114, 214) is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), so that a presence of a metallic object is determined when changes in inductive properties caused by the metallic object are registered by said first and second reception conductor loop systems, andwherein the sensor operates in a frequency range between 1 kHz and 10 kHz.
1 Assignment
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Accused Products
Abstract
A sensor for locating metallic objects, in particular a metal sensor for building materials, includes at least one transmission coil and at least one reception conductor loop system that are inductively coupled to one another. The reception conductor loop system is made up of conductor structures on a printed circuit board. A second reception conductor loop system can be provided, which is situated coaxial to the first reception conductor loop system in a common first plane with it on the printed circuit board. The sensor preferably operates in a frequency range between 1 kHz and 10 kHz.
24 Citations
27 Claims
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1. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) for inducing a flux and at least one reception conductor loop system (112, 212) for receiving said flux modified by a metallic object, wherein said at least one transmission coil (116, 216) and said at least one reception conductor loop system (112, 212) are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a second reception conductor loop system (114, 214) is provided for receiving said flux, wherein said second reception conductor loop system (114, 214) is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), so that a presence of a metallic object is determined when changes in inductive properties caused by the metallic object are registered by said first and second reception conductor loop systems, and wherein the sensor operates in a frequency range between 1 kHz and 10 kHz.
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19. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) for inducing a flux and at least one reception conductor loop system (112, 212) for receiving said flux modified by a metallic object, wherein said at least one transmission coil (116, 216) and said at least one reception conductor loop system (112, 212) are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a second reception conductor loop system (114, 214) is provided for receiving said flux, wherein said second reception conductor loop system (114, 214) is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), and wherein a shunt resistor (246) connected in series with at least one transmission coil (116, 216) is provided, which is embodied as a conductor path structure on a printed circuit board (100, 200) so that a presence of a metallic object is determined when changes in inductive properties caused by the metallic object are registered by said first and second reception conductor loop systems.
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20. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) for inducing a flux and at least one reception conductor loop system (112, 212) for receiving said flux modified by a metallic object, wherein said at least one transmission coil (116, 216) and said at least one reception conductor loop system (112, 212) are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a shunt resistor (246) connected in series with at least one transmission coil (116, 216) is provided, which is embodied as a conductor path structure on a printed circuit board (100, 200), further comprising an evaluation circuit (260), which is connectable with both the shunt resistor (246) and at least one reception conductor loop system (112, 114, 212, 214) via switching means (248), wherein the evaluation circuit (260) has at least one bipolar input stage so that a presence of a metallic object is determined when changes in inductive properties caused by the metallic object are registered by said reception conductor loop system.
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21. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) and at least one reception conductor loop system (112, 212) that are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a second reception conductor loop system (114, 214) is provided, which is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), and wherein the sensor operates in a frequency range between 1 kHz and 10 kHz wherein an electric shielding electrode (242, 244) is provided between the at least one transmission coil (116, 216) and at least one reception conductor loop system (112, 114, 212, 214), and the electric shielding electrode (242, 244) is embodied on the printed circuit board (100, 200).
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22. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) and at least one reception conductor loop system (112, 212) that are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a second reception conductor loop system (114, 214) is provided, which is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), and wherein the sensor operates in a frequency range between 1 kHz and 10 kHz, and wherein at least one transmission coil (116, 216) is situated vertically offset from the plane (126, 226) of the printed circuit board (100, 200), and wherein additional compensation conductor loops (130, 132, 230, 232) of at least one reception conductor loop system (112, 114, 212, 214) are provided in the vicinity of at least one transmission coil (116, 216) on the printed circuit board (100, 200).
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23. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) and at least one reception conductor loop system (112, 212) that are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100, 200), wherein a second reception conductor loop system (114, 214) is provided, which is situated coaxial to the first reception conductor loop system (112, 212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), and wherein the sensor operates in a frequency range between 1 kHz and 10 kHz, and wherein at least one transmission coil (116, 216) is situated vertically offset from the plane (126, 226) of the printed circuit board (100, 200), and wherein additional compensation conductor loops (130, 132, 230, 232) of at least one reception conductor loop system (112, 114, 212, 214) are provided beneath the at least one transmission coil (116, 216) on the printed circuit board (100, 200).
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24. A sensor for locating metallic objects, in particular a metal sensor for building materials, having at least one transmission coil (116, 216) for inducting a flux and at least one reception conductor loop system (112, 212) for receiving said flux modified by a metallic object, wherein said at least one transmission coil (112, 216) and said at least one reception conductor loop system (112, 212) are inductively coupled to one another,
wherein the reception conductor loop system (112, 212) is comprised of conductor structures on a printed circuit board (100,200), wherein a second reception conductor loop system (114, 214) is provided for receiving said flux, wherein said second reception conductor loop system (114, 214)) is situated coaxial to the first reception conductor loop system (112,212), in a common first plane (126, 226) with it on the printed circuit board (100, 200), so that a presence of a metallic object is determined when changes in inductive properties caused by the metallic object are registered by said first and second reception conductor loop systems, wherein the sensor operates in a frequency range between 1 kHz and 10 kHz, and wherein a shunt resistor (246) connected in series with at least one transmission coil (116, 216) is provided, which is embodied as a conductor path structure on a printed circuit board (100, 200).
Specification