公开(公告)号：US20220334287A1

公开(公告)日：2022-10-20

申请号：US17238447

申请日：2021-04-23

Applicant: Harbin Institute of Technology

Inventor： Kai Song ,  Ying Sun ,  Tian Zhou ,  Guo Wei ,  Chunbo Zhu

IPC: G01V3/10 ,  G01V3/38

Abstract: The disclosure discloses a detection coil structure based on interlayer coupling and a metal object detection system. The detection coil structure includes: a top sub-detection coil and a bottom sub-detection coil, wherein the top and bottom sub-detection coils are the same in structure and similar or same in size and are orthogonal to each other, and both the outer boundaries and geometric symmetry centers of the detection coils are completely coincident; the top sub-detection coil includes a first terminal, a second terminal, a third terminal and a fourth terminal, and the bottom sub-detection coil includes a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal; and the first terminal is connected to the second terminal, the seventh terminal is connected to the eighth terminal, and the third terminal and the fourth terminal are respectively connected to the fifth terminal and the sixth terminal. When there is no metal object near the coil, the top and bottom sub-detection coils are completely decoupled, and the mutual inductance is zero. When there is a metal object near the coil, the detection coil structure can significantly amplify the impedance variation of the metal object to the entire detection coil to improve the detection effect by means of the mutual inductance coupling effect between the top and bottom sub-detection coils, and at the same time, a staggered arrangement structure can further eliminate non-detection blind zones.

公开(公告)号：US11520068B2

公开(公告)日：2022-12-06

申请号：US17238447

申请日：2021-04-23

Applicant: Harbin Institute of Technology

Inventor： Kai Song ,  Ying Sun ,  Tian Zhou ,  Guo Wei ,  Chunbo Zhu

IPC: G01V3/10 ,  G01V3/38

Abstract: The disclosure discloses a detection coil structure based on interlayer coupling and a metal object detection system. The detection coil structure includes: a top sub-detection coil and a bottom sub-detection coil, wherein the top and bottom sub-detection coils are the same in structure and similar or same in size and are orthogonal to each other, and both the outer boundaries and geometric symmetry centers of the detection coils are completely coincident; the top sub-detection coil includes a first terminal, a second terminal, a third terminal and a fourth terminal, and the bottom sub-detection coil includes a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal; and the first terminal is connected to the second terminal, the seventh terminal is connected to the eighth terminal, and the third terminal and the fourth terminal are respectively connected to the fifth terminal and the sixth terminal. When there is no metal object near the coil, the top and bottom sub-detection coils are completely decoupled, and the mutual inductance is zero. When there is a metal object near the coil, the detection coil structure can significantly amplify the impedance variation of the metal object to the entire detection coil to improve the detection effect by means of the mutual inductance coupling effect between the top and bottom sub-detection coils, and at the same time, a staggered arrangement structure can further eliminate non-detection blind zones.