Detection element for objects and detection device using the same
First Claim
1. A body detecting element configured to be buried in the ground with a metal body and comprising:
- a detector housing configured to be integrally mounted on an outer surface of the metal body;
a magnetic member disposed in the detector housing and configured as a magnetic core;
an antenna coil wound around the magnetic member; and
one of a capacitor and a piezo-resonator connected to both the ends of the antenna coil to form a resonance circuit with the antenna coil, wherein the detector housing includes one of a cross section and a length smaller than a corresponding cross section and length of an area to be detected by said body detecting element.
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Abstract
A body detecting element is buried in the ground together with a body such as a metal body and includes a magnetic member acting as a magnetic core, an antenna coil wound around the magnetic member and a capacitor connected to both the ends of the antenna coil for forming a resonance circuit together with the antenna coil. The antenna coil is mounted on the body integrally therewith through an electromagnetic shield member with the outer peripheral surface thereof confronting the outer surface of the body. A body detecting element includes an RFID circuit connected to the antenna coil and mounted on a body integrally therewith such that the outer peripheral surface of the antenna coil confronts the outer surface of the body through an electromagnetic shield member. Even if the body detecting element is mounted on the body such as the metal pipe integrally therewith, it can accurately detect the body because a resonant frequency and the Q value of the coil are not changed. There is almost no possibility that detecting element is broken or moved even if a body other than the above body is dug.
204 Citations
32 Claims
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1. A body detecting element configured to be buried in the ground with a metal body and comprising:
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a detector housing configured to be integrally mounted on an outer surface of the metal body;
a magnetic member disposed in the detector housing and configured as a magnetic core;
an antenna coil wound around the magnetic member; and
one of a capacitor and a piezo-resonator connected to both the ends of the antenna coil to form a resonance circuit with the antenna coil, wherein the detector housing includes one of a cross section and a length smaller than a corresponding cross section and length of an area to be detected by said body detecting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a plurality of laminated soft magnetic metal thin films or thin sheets.
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3. A body detecting element according to claim 1, wherein the metal body is a metal pipe and the antenna coil is disposed in the detector housing with the axial center direction perpendicular to the axial center direction of the metal pipe.
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4. A body detecting element according to claim 1, wherein the metal body is a metal pipe and the antenna coil is disposed in the detector housing with the axial center direction in parallel with the axial center direction of the metal pipe.
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5. A body detecting element according to claim 1, wherein the body is a metal pipe and the detector housing is an insulating member including a recessed surface configured to fit around a portion of the metal pipe.
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6. A body detecting element according to claim 1, wherein the detector housing includes one of convex portion and a convex surface opposite from a surface in contact with the outer surface of the metal body.
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7. A detecting apparatus, comprising
a transmitting unit configured to transmit a radio wave having a specific frequency from the ground to a body detecting element according to claim 1; -
a receiving unit configured to receive a radio wave generated by the resonation of the resonance circuit of the detecting element; and
a detection and display unit configured to detect and display the received radio wave.
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8. A body detecting element according to claim 1, further comprising:
an electromagnetic shield member disposed in the detector housing between the magnetic member and the metal body, and comprising copper, copper alloy or aluminum with the outer peripheral surface thereof confronting the outside surface of the body.
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9. A body detecting element according to claim 8, wherein the body is a metal pipe, and the detector housing is an insulating member including a recessed surface configured to fit around a portion of the metal pipe.
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10. A body detecting element according to claim 1, wherein the magnetic member comprises:
a composite material comprising soft magnetic metal powder or ferrite powder and plastic.
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11. A body detecting element according to claim 10, wherein the magnetic member comprises:
a composite material comprising Fe or Fe—
Co alloy powder or flake in an amount not less than 74 wt % to not more than 86 wt % and plastic in an amount not less than 14 wt % to not more than 26 wt %.
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12. A body detecting element according to claim 10, wherein the magnetic core is a columnar body having a rectangular or elliptic cross-section and the ratio of the long side to the short side of the rectangular shape and the ratio of the major axis to the minor axis of the elliptic shape are not less than 1.2 to less than 16.
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13. A body detecting element according to claim 12, wherein the antenna coil is substantially uniformly wound around the columnar body over the entire length thereof.
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14. A body detecting element configured to be buried in the ground with a non-magnetic metal pipe, the body detecting element comprising:
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a flexible magnetic member configured as a magnetic core and further configured to be wrapped completely around an outer surface of the non-magnetic metal pine along a predetermined length of the non-magnetic metal pipe;
an antenna coil wound around the magnetic members; and
one of a capacitor and a piezo-resonator connected to both the ends of the antenna coil to form a resonance circuit with the antenna coil. - View Dependent Claims (15)
a plurality of soft magnetic metal thin films or thin sheets.
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16. A body detecting element configured to be buried in the ground with a magnetic metal pipe and
a flexible electromagnetic shield member configured to be wrapped completely around an outer surface of the magnetic metal pipe along a predetermined length of the magnetic metal pipe, and comprising copper, copper alloy or aluminum; -
a flexible magnetic member wrapped around the electromagnetic shield member, and configured as a magnetic core, an antenna coil wound around the magnetic member; and
one of a capacitor and piezo-resonator connected to both the ends of the antenna coil to form a resonance circuit with the antenna coil.
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17. A body detecting element configured to be buried with an explosive body and comprising:
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a detector housing configured to be integrally mounted on an outer surface of the explosive body;
a magnetic member configured as a magnetic core and comprising a composite material comprising Fe or Fe—
Co alloy powder or flake in an amount not less than 74 wt % to not more than 86 wt % and plastic in an amount not less than 14 wt % to not more than 26 an antenna coil wound around the magnetic member; and
one of a capacitor a piezo-resonator connected to both the ends of the antenna coil to form a resonance circuit with the antenna coil, wherein the detector housing includes one of a cross section and a length smaller than a corresponding cross section and length of an area to be detected by said body detecting element. - View Dependent Claims (18, 19)
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20. A body detecting element mounted on a metal body and comprising:
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a detector housing configured to be integrally mounted on an outer surface of the metal body;
a magnetic member disposed in the detector housing and configured as a magnetic core, an antenna coil wound around the magnetic member; and
an RFID circuit connected to the antenna coil, wherein the RFID circuit includes a memory for storing data characteristic to the metal body, is activated by a radio wave having a specific frequency and transmitted from a detecting apparatus, reads data from the memory in response to a read command issued by the data communication through the radio wave, writes data to the memory in response to a write command and issues a response command to the detecting apparatus, wherein the detector housing includes one of a cross section and a length smaller than a corresponding cross section and length of an area to be detected by said body detecting element. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
a plurality of laminated soft magnetic metal thin films or thin sheets.
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22. A body detecting element according to claim 20, wherein the magnetic member comprises:
a composite material comprising soft magnetic metal powder or ferrite powder and plastic.
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23. A body detecting element according to claim 20, wherein the body is a metal pipe and the antenna coil is disposed with the axial center direction thereof perpendicular to the axial center direction of the body.
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24. A body detecting element according to claim 20, wherein the body is a metal pipe and the antenna coil is disposed with the axial center direction thereof in parallel with the axial center direction of the body.
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25. A body detecting element according to claim 20, wherein the body is a metal pipe, and the detector housing includes a recessed surface configured to fit around a portion of the metal pipe.
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26. A body detecting element according to claim 20, wherein the detector housing includes one of a convex portion and a convex surface opposite from a surface in contact with the outer surface of the metal body.
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27. A body detecting apparatus comprising:
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means for transmitting a radio wave having a specific frequency to a body detecting element according to claim 20;
means for activating the RFID circuit of the body detecting element in response to the radio wave; and
means for reading and writing data from and in the memory of the RFID circuit; and
means for receiving a response signal from the detecting element, thereby identifying the body.
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28. A body detecting element according to claim 20, further comprising:
an electromagnetic shield member disposed in the detector housing between the magnetic member and the metal body, and comprising copper alloy or aluminum with the outer peripheral surface thereof confronting the outside surface of the body.
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29. A body detecting element according to claim 28, wherein the body is a metal pipe, and the detector housing includes a recessed surface configured to fit around a portion of the metal pipe.
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30. A body detecting element configured to be mounted on a non-magnetic metal pipe and comprising:
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a flexible magnetic member configured as a magnetic core and further configured to be wrapped completely around an outer surface of the non-magnetic metal pipe along a predetermined length of the non-magnetic metal pipe;
an antenna coil wound around the magnetic member; and
an RFID circuit connected to the antenna coil, wherein the RFID circuit includes a memory for storing data characteristic to the body, is activated by a radio wave having a specific frequency and transmitted from a detecting apparatus, reads data from the memory in response to a read command issued by the data communication of the radio wave, writes data to the memory in response to a write command and issues a response command to the detecting apparatus. - View Dependent Claims (31)
a plurality of soft magnetic metal thin films or thin sheets.
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32. A body detecting element configured to be mounted on a magnetic metal pipe and comprising:
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a flexible electromagnetic shield member configured to be wrapped completely around an outer surface of the magnetic metal pipe along a predetermined length of the magnetic metal pipe, and comprising copper, copper alloy or aluminum;
a flexible magnetic member wrapped around the electromagnetic shield member and configured as a magnetic core;
an antenna coil wound around the magnetic member; and
an RFID circuit connected to the antenna coil, wherein the RFID circuit includes a memory for storing data characteristic to the body, is activated by a radio wave having a specific frequency and transmitted from a detecting apparatus, reads data from the memory in response to a read command issued by the data communication of the radio wave, writes data to the memory in response to a write command and issues a response command to the detecting apparatus.
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Specification