Metal detection floor single antenna

Abstract

A detection system for detecting EAS marker shielding material, the system including a transceiver configured to generate an interrogation signal. A base includes a transmitter coil and a receiver coil coupled to the transceiver. The transmitter coil generates an electromagnetic field within a detection area based on the interrogation signal. The receiver coil detects the electromagnetic field, which induces a response signal in the receiver coil. The response signal is sent to the transceiver. The response signal varies in response to an interference of the electromagnetic field, which indicates a presence of an EAS marker shield passing through the detection area.

Description

Cross-references to related applications

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 534,412, filed August 24, 2023, entitled “METAL DETECTION FLOOR MONOANTENNA”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to an antenna system for anti-theft purposes, and more specifically, to a metal detection system configured to detect the shielding material of electronic article security (“EAS”) markings. Background Technology

[0003] Many retailers use EAS systems to prevent shoplifting. These systems traditionally employ antennas (e.g., transmitter and receiver antennas) to detect EAS tags or labels (e.g., RFID tags, tags with oscillating circuitry or chips) attached to or embedded in merchandise sold by the retailer. Traditionally, EAS antennas are positioned on opposite sides of a store entrance or exit and configured to trigger an alarm when an item with an EAS tag is detected crossing the detection zone between the antennas. However, the effectiveness of EAS detection decreases when thieves use EAS tag-shielding materials (e.g., metal foil) to shield EAS tags from detection, for example, by placing EAS-tagged items in shopping bags lined with metal foil.

[0004] Given the above, some retailers combine metal detection systems with EAS (External Energy Saving System) systems to detect the presence of EAS-marked shielding materials. Such systems typically employ transmitter and receiver antennas mounted in vertical bases placed on opposite sides of the detection area (e.g., store entrances or exits). However, this type of metal detection system is conspicuous and may alert thieves to attempt to steal merchandise using other methods (e.g., EAS removers). Furthermore, operating two separate antennas can be very expensive, especially from an installation cost perspective, requiring retailers to be prepared for (e.g., additional utilities for wiring on opposite sides of the detection area, labor costs for securing each antenna to the floor, etc.). Additionally, such systems require a considerable footprint and / or may reduce the business's aesthetic appeal. Summary of the Invention

[0005] The following is an overview of this disclosure to provide a basic understanding of some aspects. This overview is not intended to identify key or important elements, nor to define any limitations on the embodiments or claims. The content of this invention provides a simplified overview of some aspects that may be described in more detail in other parts of this disclosure. Furthermore, any aspect described may exist independently or in unrestricted combination with other described aspects.

[0006] The following describes a metal detection system that optimizes footprint, reduces overall installation costs, maintains the aesthetic appeal of the business, and is inconspicuous to thieves. The metal detection system includes a transmitter antenna (coil) and a receiver antenna (coil), which can be positioned in or below ground to detect EAS-marked shielding material passing through a detection area located above ground.

[0007] According to one aspect, a metal detection system for detecting EAS-marked shielding materials is provided. The metal detection system includes a transceiver configured to generate an interrogation signal. A transmitter coil is coupled to the transceiver and configured to transmit the interrogation signal over a detection area near the metal detection system. A receiver coil is coupled to the transceiver and configured to detect the interrogation signal and send a response signal to the transceiver indicating the status of the interrogation signal.

[0008] According to another aspect, a detection system for detecting EAS metallic shielding materials is provided. The detection system includes a base having a transmitter coil and a receiver coil. The transmitter coil surrounds the receiver coil and is disposed in a substantially common plane with it. The transmitter coil is configured to transmit an interrogation signal to a detection area proximate to the base. The receiver coil is configured to detect the state of the interrogation signal. A controller is operatively connected to the transmitter coil and the receiver coil and is configured to activate at least one of an audible alarm and / or a visual alarm when the receiver coil detects interference with the interrogation signal.

[0009] In one aspect of the invention, a metal detection system for detecting shielding material of Electronic Article Surveillance (EAS) tags includes: a transceiver configured to generate an interrogation signal; and a transmitter coil coupled to the transceiver and configured to generate an electromagnetic field in a detection area based on the interrogation signal and induce an acknowledgment signal in a receiver coil. The receiver coil is coupled to the transceiver and configured to send the acknowledgment signal to the transceiver, wherein the acknowledgment signal changes when EAS shielding material is present in the detection area, such that the transceiver determines the presence of EAS shielding material in the detection area based on the acknowledgment signal, wherein the transmitter coil and the receiver coil are coupled and substantially concentric, and wherein the transmitter and receiver coils are primarily disposed in a common plane or primarily disposed in substantially parallel planes.

[0010] In another aspect of the invention, the detection area is close to the metal detection system. The transmitter coil and receiver coil are located: (1) above or in the ceiling, wherein a substantially common plane or substantially parallel plane is substantially parallel to the ceiling; and / or (2) below or in the ground, wherein a substantially common plane or substantially parallel plane is substantially parallel to the ground.

[0011] In another aspect of the invention, the metal detection system further includes an RX balance control coil coupled to the transceiver and configured to adjust the strength of the acknowledgment signal transmitted from the receiver coil to the transceiver.

[0012] In another aspect of the invention, the receiver coil is rotatable relative to the transmitter coil while remaining substantially concentric and located on a substantially common plane or substantially parallel plane.

[0013] In another aspect of the invention, the detection system further includes a horizontally oriented base that is substantially parallel to the ground, wherein the transmitter coil and the receiver coil are attached to the base.

[0014] In another aspect of the invention, the metal detection system also includes a ferrite tile disposed below the base and configured to shield the detection system from electromagnetic interference.

[0015] In another aspect of the invention, the interrogation signal is a high-frequency AC waveform that generates (induces) an electromagnetic field in the detection area.

[0016] In another aspect of the invention, the transceiver includes a controller configured to convert an acknowledgment signal into operational data indicating the operational status of the metal detection system.

[0017] In another aspect of the invention, the metal detection system is operatively connected to a host device, which is operable to adjust the response signal transmitted from the receiver coil.

[0018] In another aspect of the invention, the metal detection system further includes a controller operatively connected to the transceiver, the controller being configured to activate at least one or more of an audible alarm, a light, and / or transmit a message to a host device and / or a remote device operatively connected to the controller.

[0019] In another aspect, a detection system for detecting EAS (Electronic Article Surveillance) tag shielding material includes: a detection base comprising a transmitter coil and a receiver coil. The transmitter coil and receiver coil are substantially concentric and disposed in or substantially parallel to a common plane. The transmitter coil is configured to generate an electromagnetic field toward a detection area proximate to the detection base based on an interrogation signal. The receiver coil is configured to generate a response signal that varies in response to interference in the electromagnetic field, the interference indicating the presence of EAS metallic shielding material in the detection area. The system also includes a controller operatively connected to the detection base. The controller is configured to activate at least one of an audible alarm and / or a visual alarm when the receiver coil generates a response signal indicating the presence of EAS tag shielding material across the detection area.

[0020] In another aspect of the invention, the detection base further includes an RX balance control coil configured to adjust the strength of the response signal transmitted from the receiver coil.

[0021] In another aspect of the invention, the detection system further includes a host device operatively connected to the controller. This host device is operable to adjust the strength of the response signal transmitted from the receiver coil.

[0022] In another aspect of the invention, the host device includes a user interface operable to adjust the strength of an interrogation signal and / or a response signal.

[0023] In another aspect of the invention, one or more planes are substantially parallel to the vertical wall.

[0024] In another aspect of the invention, a detection system for detecting EAS tag shielding material includes: a controller communicating with a transmitter coil and a receiver coil, wherein the transmitter coil and the receiver coil are coupled, substantially concentric, and primarily disposed in a substantially common plane or substantially parallel plane. The controller has a processor and a memory storing executable code that, when executed by the processor, performs actions including: receiving an operation setting from a user; generating an interrogation signal in the transmitter coil, thereby causing the transmitter coil to generate an electromagnetic field toward a detection area. This action also includes receiving an response signal from the receiver coil, wherein the response signal is induced by the electromagnetic field, and wherein the response signal varies in response to interference in the electromagnetic field indicating the presence of EAS tag shielding material in the detection area. This action further includes using operation data including the response signal to determine whether EAS tag shielding material is present in the detection area. This action also includes outputting a detection system status to a user, wherein the detection system status includes generating an alarm when EAS tag shielding material is present in the detection area. The detection area is located near the detection system. The transmitter coil and receiver coil are located: (1) above or in the ceiling, where the basic common plane or basic parallel plane is substantially parallel to the ceiling, and / or (2) below or in the ground, where the basic common plane or basic parallel plane is substantially parallel to the ground.

[0025] In another aspect of the invention, the detection system further includes an RX balance control coil coupled to the transceiver and configured to adjust the strength of the acknowledgment signal transmitted from the receiver coil to the transceiver.

[0026] In another aspect of the invention, generating an alarm includes activating an audible alarm, at least one or more of lights, and / or transmitting a message to a host device and / or a remote device connected to the controller.

[0027] In another aspect of the invention, the transmitter coil is rotatable relative to the receiver coil while remaining substantially concentric and located on a substantially common plane or substantially parallel plane.

[0028] In another aspect of the invention, the operation settings include at least one of the following: the signal strength of the RX balancing coil, the strength of the electromagnetic field, and / or the frequency of the interrogation signal. Operation data is output to the user, and the operation data includes at least one of the following: the signal strength of the response signal, the noise level of the response signal, and / or the metal detection signal. Attached Figure Description

[0029] The above and other features, examples, and advantages of this disclosure can be better understood when the following detailed description is read with reference to the accompanying drawings, wherein,

[0030] Figure 1 This is a perspective view of a conventional metal detection system with a transmitter antenna and a receiver antenna spaced apart and defining a detection area between them.

[0031] Figure 2A It is an exploded perspective view of an example metal detection system according to this disclosure, displayed in relation to the ground.

[0032] Figure 2B yes Figure 2A A top view of an example metal detection system;

[0033] Figure 2C This is a top view of the transmitter coil and receiver coil according to this disclosure, wherein... Figure 2B Compared to the coil configuration shown, the receiver coil is rotated 90 degrees relative to the transmitter coil;

[0034] Figure 3 This is a schematic diagram of an example antenna printed circuit board (PCB) according to this disclosure;

[0035] Figure 4A This is a block diagram view of another example metal detection system according to this disclosure;

[0036] Figure 4B This is a block diagram view of the controller PCB according to the controller disclosed herein;

[0037] Figure 5 This is an exploded perspective view of a pair of metal detection systems according to this disclosure;

[0038] Figure 6 This is a diagram of an example user interface of a metal detection system according to this disclosure;

[0039] Figure 7 This is an illustration of another example user interface of a metal detection system according to this disclosure;

[0040] Figure 8 This is a top view of another example metal detection system according to this disclosure; and

[0041] Figure 9 This is a flowchart of a method for using the detection system according to this disclosure. Detailed Implementation

[0042] Reference will now be made in detail to embodiments of this teaching, examples of which are illustrated in the accompanying drawings. It should be understood that other embodiments may be utilized, and structural and functional changes may be made without departing from the scope of this teaching. Furthermore, features of the embodiments may be combined, switched, or changed without departing from the scope of this teaching; for example, features of each disclosed embodiment may be combined, switched, or replaced with features of other disclosed embodiments. Therefore, the following description is presented by way of illustration and does not limit the various alternatives and modifications that may be made to the illustrated embodiments, and such alternatives and modifications remain within the spirit and scope of this teaching.

[0043] As used herein, the terms “example” and “exemplary” refer to instances or illustrations. The terms “example” or “exemplary” do not indicate key or preferred aspects or embodiments. Unless the context otherwise specifies, the word “or” is intended to be inclusive rather than exclusive. As an example, the phrase “A uses B or C” includes any inclusive permutation (e.g., A uses B; A uses C; or A uses both B and C). On the other hand, unless the context otherwise specifies, the articles “a” and “an” are generally intended to mean “one or more”.

[0044] "Logic" refers to any information and / or data that can be used to direct the operation of a processor. Logic can be formed by instruction signals stored in memory (e.g., non-transitory memory). Software is an example of logic. In another aspect, logic can include standalone hardware or hardware combined with software. For example, logic can include digital and / or analog hardware circuitry, such as hardware circuitry that includes logic gates (e.g., AND, OR, XOR, NAND, NOR, and other logic operations). Furthermore, logic can be programmed and / or include aspects of various devices and is not limited to a single device.

[0045] The term "EAS tag" can encompass security tags that include circuitry, such as an oscillating circuit containing coils and / or capacitors, or it can be embodied as an integrated circuit (e.g., a chip) designed to be detected by an electronic article protection system. Alternatively, it can be embodied as a radio frequency identification (RFID) tag.

[0046] The terms “substantially,” “mainly,” “approximately,” and their variations are intended to indicate that the described feature is equal to or approximately equal to the expected value or characteristic, reflecting tolerances, conversion factors, rounding, measurement errors, and other factors. For example, the term “substantially rectangular” is intended to indicate a rectangular or approximately rectangular structure. As another example, the terms “substantially,” “mainly,” “approximately,” and their variations can indicate an exact value or characteristic, or within 15% of the exact value, such as within 10% or 3% of the exact value.

[0047] Electronic Article Surveillance (“EAS”) systems are typically used to detect shoplifting of goods from retail stores. EAS systems generally include an EAS antenna that detects EAS markings (such as tags or labels) attached to or embedded in the goods. Some shoplifters use EAS marking shielding materials (such as metal or foil) to evade detection, for example, by placing goods with EAS markings inside shopping bags lined with EAS marking shielding material to prevent the EAS markings from being detected.

[0048] In light of the above, some retailers are utilizing metal detection systems 10 ( Figure 1 The metal detection system 10 is used in conjunction with an EAS (Electronic Assay System) to detect EAS-marked shielding material. A typical metal detection system 10 includes a transmitter antenna 12 and a receiver antenna 14. The transmitter antenna 12 and receiver antenna 14 are typically mounted on spaced-apart upright bases, for example, on opposite sides of a detection area corresponding to a store entrance or exit. The transmitter antenna 12 transmits an interrogation signal detected by the receiver antenna 14. When EAS-marked shielding material passes between antennas 12 and 14 (e.g., through the detection area), the receiver antenna 14 detects interference in the interrogation signal transmitted by the transmitter antenna 12, thereby activating an alarm (e.g., an audible alarm and / or lighting) or alerting store staff (e.g., via a coded message) to potential shoplifters entering the store.

[0049] Because such metal detection systems are highly visible, many thieves resort to other methods of breaking into stores, such as physically removing EAS tags from merchandise using a dismantling tool before leaving the store (e.g., in the fitting room). Furthermore, these metal detection systems require a large footprint and are often unsightly, detracting from the store's aesthetic appeal.

[0050] As described herein, exemplary embodiments of the metal detection system include a detection base on which a transmitter antenna and a receiver antenna are attached and integrated as a low-profile assembly. The detection base may be disposed below ground, with the detection area located above ground. The transmitter antenna and receiver antenna each include a transmitter coil and a receiver coil, respectively. The transmitter coil is configured to transmit an electromagnetic field induced by an interrogation signal (i.e., an electromagnetic field) within the detection area, and the receiver coil is configured to detect the electromagnetic field by generating a response signal induced by the electromagnetic field. This response signal indicates the state of the electromagnetic field. In particular, the receiver coil is configured to detect interference in the electromagnetic field generated by the transmitter coil when EAS-marked shielding material (e.g., tin foil / metal liner bag) passes through the detection area.

[0051] In some exemplary embodiments, the transmitter coil may include a loop surrounding the receiver coil, and the receiver coil may be embodied as a figure-eight loop. In some exemplary embodiments, when viewed from above, the transmitter coil and receiver coil include loops that may overlap and intersect each other. In some exemplary embodiments, the transmitter coil and receiver coil may be arranged in a common plane. In some exemplary embodiments, the metal detection system may include a controller operatively connected to the transmitter coil and receiver coil. The controller may be configured to receive operational data corresponding to an acknowledgment signal generated by the receiver coil. In some exemplary embodiments, the controller may be operatively connected to at least one of an audible alarm, a visual alarm, a host device, and / or a user device. In exemplary embodiments, the host device may be a network configurator, and the user device may be an employee's mobile phone.

[0052] The transceiver may consist of one or more antenna PCBs and may be positioned between the detection base and the controller. The transceiver may also be coupled to a transmitter coil and a receiver coil. The transceiver generates an interrogation signal and receives an response signal from the receiver coil. In some exemplary embodiments, the interrogation signal may be a high-frequency AC waveform, such as a sine wave transmitted at a frequency between approximately 20 kHz and 30 kHz. In some exemplary embodiments, the transceiver may include a processor configured to convert the response signal transmitted from the receiver coil into operational data.

[0053] In some exemplary embodiments, a host device is operatively connected to a controller and operable to adjust the metal detection system, for example, to increase or decrease the signal strength (e.g., minimize signal distortion). In some exemplary embodiments, one or more metal detection systems may be operatively connected to the controller, for example, one located below the detection area and one above the detection area, for enhanced detection. In some exemplary embodiments, when the metal detection system is located within or below the detection area, the metal detection system may be located in the floor. Furthermore, in some exemplary embodiments, when the metal detection system is located above the detection area, the metal detection system may be located within or below the ceiling.

[0054] In some exemplary embodiments, one or more ferrite tiles may be disposed below the detection base to shield the interrogation signal from interference, such as shielding the electromagnetic field of the interrogation signal from interference.

[0055] Reference Figure 2A and Figure 2B This illustration shows a first exemplary embodiment of a metal detection system 200 according to the present disclosure. The metal detection system 200 includes a base 240, wherein a transmitter coil 260 (also referred to as a "TX coil" or "TX loop") and a receiver coil 270 (also referred to as an "RX coil" or "RX loop") are attached to the base. Typically, the metal detection system 200 is configured to detect a detection area above a ground surface 233 (e.g., the floor of a retail shopping entrance). Figure 2A The EAS-marked shielding material 231 (e.g., a metal foil liner bag) is used. In this exemplary embodiment, the metal detection system 200 is configured to perform the aforementioned detection from within or below the ground 233 (e.g., within or below the floor), making the metal detection system 200 inconspicuous to potential shoplifters.

[0056] In the illustrated embodiment, the base 240 is horizontally oriented such that its upper and lower surfaces are substantially parallel to the ground, wherein the lower surface lies on the face of the base 240 opposite to the upper surface, spaced apart from the upper surface, and substantially parallel to the upper surface. In some embodiments, the base 240 embodies a waterproof thermoplastic (e.g., polymethyl methacrylate) housing for encapsulating the transmitter coil 260 and receiver coil 270 therein. It is also contemplated that the base 240 may be made of another rigid material, such as wood or glass.

[0057] The transmitter coil 260 and receiver coil 270 may include connecting wires for transmitting AC current therethrough. (See reference...) Figure 2BIn the exemplary embodiments shown, the transmitter coil 260 may be an elongated loop substantially surrounding the receiver coil 270. In the illustrated embodiments, the transmitter coil 260 and the receiver coil 270 may be primarily arranged in a common plane defined by the x-axis and y-axis. In some exemplary embodiments, the spacing between the transmitter coil 260 and the receiver coil 270 may be approximately 6 cm. Alternatively, the gap (spacing distance) between the transmitter coil 260 and the receiver coil 270 in the plane defined by the x-axis and y-axis may be approximately 6 cm. In other exemplary embodiments, those skilled in the art may choose to use another spacing distance between the transmitter coil 260 and the receiver coil 270. This aspect of the present disclosure advantageously allows the metal detection system to have a low profile, reducing installation space requirements and enabling the metal detection system to be placed substantially parallel to the ground 233, for example, placed below or within the ground.

[0058] Returning to the example illustrated, the transmitter coil 260 can be arranged in a generally rectangular configuration and electrically connected to the transceiver 280, such as via connecting wires extending to the transceiver 280. It is conceivable that the transmitter coil 260 can be arranged in different non-limiting configurations, for example, in a generally elliptical, circular, or square configuration.

[0059] The receiver coil 270 can be arranged in a generally rectangular configuration and connected to the transceiver 280, for example, via connecting wires extending to the transceiver 280. It is contemplated that, in some exemplary embodiments, the receiver coil 270 can be arranged in other non-limiting configurations, such as a generally elliptical, circular, or square configuration. Figure 2B In the exemplary embodiment shown, the receiver coil 270 is arranged in a figure-eight configuration. This aspect of the present disclosure advantageously reduces the strength of the acknowledgment signal transmitted by the receiver coil 270, thereby reducing signal distortion and saturation in the receiver circuitry of transceivers 280, 380, where the amplified input signal is distorted (e.g., a clipped sine wave signal). This reduction in signal distortion and saturation provides better acknowledgment signal resolution at transceiver 280, which results in better detection capability for EAS mark shielding materials.

[0060] Reference Figure 2C As can be seen, in some exemplary embodiments, with Figure 2BCompared to the receiver arrangement, the receiver coil 270 can be rotated 90 degrees relative to the transmitter coil 260 of the base 240. Therefore, when the transmitter coil 260 and receiver coil 270 are center-aligned and viewed from above, the transmitter coil 260 and receiver coil 270 comprise loops that overlap and intersect each other. Thus, the receiver coil 270 and transmitter coil 260 of the base 240 can rotate relative to each other at any desired angle to detect EAS marking shielding material. Furthermore, the receiver coil 270 and transmitter coil 260 can be substantially concentric and located in substantially parallel planes. Additionally, in other embodiments, the receiver coil 270 can be rotated relative to the transmitter coil 260.

[0061] In an exemplary embodiment, the receiver coil 270 may be a figure-eight configuration consisting of approximately four turns of wire. The height of the receiver coil 270 may be approximately 40 cm, and the width of the receiver coil 270 may be approximately 138 cm. The transmitter coil 260 may be arranged as a rectangular configuration consisting of approximately two turns of wire, having a height of approximately 28 cm and a width of approximately 150 cm. Thus, the transmitter coil 260 may have two long sides (150 cm) and two short sides (28 cm). In some exemplary embodiments, the first long side 260a of the transmitter coil 260 may intersect and pass through the upper loop 270a of the receiver coil 270, and the second long side 260b of the transmitter coil 260 may intersect and pass through the lower loop 270b of the receiver coil 270.

[0062] Similarly, the first short side 260c and the second short side 260d of the transmitter coil 260 do not intersect with the receiver coil 270. Furthermore, the first short side 260c of the transmitter coil 260 is parallel to the first short side 270ac of the upper loop 270a and the first short side 270bc of the lower loop 270b of the receiver coil 270. Compared to the second short side 260d of the transmitter coil 260, the first short side 270ac of the upper loop 270a and the first short side 270bc of the lower loop 270b are closer to the first short side 260c of the transmitter coil 260. Furthermore, the second short side 260d of the transmitter coil 260 is parallel to the second short side 270ad of the upper loop 270a and the second short side 270bd of the lower loop 270b of the receiver coil 270. Compared to the first short side 260c of the transmitter coil 260, the second short side 270ad of the upper loop 270a and the second short side 270bd of the lower loop 270b are closer to the second short side 260d of the transmitter coil 260. The first short side 270ac and the second short side 270ad of the upper loop 270a of the receiver coil 270 intersect with the first long side 260a of the transmitter coil 260. Furthermore, the first short side 270bd and the second short side 270bc of the lower loop 270b of the receiver coil 270 intersect with the second long side 260b of the transmitter coil 260. Additionally, the first long side 260a of the transmitter coil 260 is parallel to the long side 270aa of the upper loop 270a of the receiver coil 270. The first long side 260a of the transmitter coil 260 is closer to the long side 270aa of the upper loop 270a of the receiver coil 270. Furthermore, the second long side 260b of the transmitter coil 260 is parallel to the long side 270bb of the lower loop 270b of the receiver coil 270. The second long side 260b of the transmitter coil 260 is closer to the long side 270bb of the lower loop 270b of the receiver coil 270. The long side 270aa of the upper loop 270a of the receiver coil 270 is parallel to and opposite to the long side 270bb of the lower loop 270b of the receiver coil 270. The first short side 270ac and the second short side 270ad of the upper loop 270 of the receiver coil 270 are parallel to each other and opposite to each other. The first short side 270bc and the second short side 270bd of the lower loop 270b of the receiver coil 270 are parallel to each other and opposite to each other.

[0063] In some exemplary embodiments, the distance between the first long side 260a of the transmitter coil 260 and the long side 270aa of the upper loop 270a of the receiver coil 270 can be approximately 6 cm, the distance between the second long side 260b of the transmitter coil 260 and the long side 270bb of the lower loop 270b of the receiver coil 270 can be approximately 6 cm, and the distance between the second short side 260d of the transmitter coil 260 and the second short side 270ad of the upper loop 270a of the receiver coil 270 can be approximately 6 cm. The distance between the second short side 260d of the transmitter coil 260 and the second short side 270bd of the lower loop 270b of the receiver coil 270 can be about 6 cm, the distance between the first short side 260c of the transmitter coil 260 and the first short side 270ac of the upper loop 270a of the receiver coil 270 can be about 6 cm, and the distance between the first short side 260c of the transmitter coil 260 and the first short side 270bc of the lower loop 270b of the receiver coil 270 can be about 6 cm.

[0064] Reference Figure 3 The transceiver 380 may include an antenna PCB. In some embodiments, the transceiver 380 may include one or more antenna PCBs corresponding to the respective transmitter coil 260 and receiver coil 270.

[0065] Transceiver 380 may include memory 381 and processor 382 configured to generate an interrogation signal. In some exemplary embodiments, the interrogation signal may be a high-frequency AC waveform with a frequency of approximately 17 to 30 kHz. Processor 382 may be embodied in any suitable processing device or group of processing devices, such as, but not limited to: processor, microprocessor, microcontroller-based platform, suitable integrated circuit, one or more field-programmable gate arrays (FPGAs) and / or one or more application-specific integrated circuits (ASICs). Memory 381 may contain instructions that, when executed by processor 382, ​​may include logic for generating a high-frequency interrogation signal, for example, based on a DC power input supplied from an external power source. In one exemplary embodiment, the external power source may be a 24V DC power supply. It is contemplated that transceiver 380 may include inverter circuitry for this purpose. (Passing through transmitter coil 260) Figure 2B The propagating high-frequency AC waveform can generate an electromagnetic field (also known as a "TX field") above the detection base 240. In some exemplary embodiments, the TX field can be generated in the detection area 230 above the ground 233.

[0066] Transceiver 280 can also be configured to receive an acknowledgment signal from receiver coil 270. Receiver coil 270 can be electromagnetically coupled to transmitter coil 260. The acknowledgment signal can be induced in receiver coil 270 by the TX field 232 (electromagnetic field) generated by the interrogation signal passing through transmitter coil 260.

[0067] In this way, transceiver 280 can be configured to detect a response signal indicating the state of an interrogation signal (i.e., the electromagnetic field, TX field), for example, in real time. In some exemplary embodiments, transceiver 280 can be configured to detect a response signal indicating the state of the electromagnetic field 232 (TX field) in real time. Specifically, transceiver 280 is configured to detect interference in the electromagnetic field 232 (TX field), for example, based on the presence of EAS shielding material 231 (e.g., a metal foil liner) passing through the detection area 230. In some embodiments, the processor 382 of transceiver 280 generates a data signal based on the response signal received from the receiver coil 270. The data signal may include operational data, for example, operational data indicating the presence or absence of EAS marker shielding material 231 passing through the detection area 230.

[0068] Reference Figure 2B A base 240 is disposed above one or more ferrite tiles 290, which are configured to protect the base 240 and transceiver 280 (and interrogation and response signals of the corresponding coils 260, 270) from electromagnetic interference, such as the presence of metal disposed in or below the ground (e.g., metal or steel reinforcement in a concrete subfloor), which could otherwise short-circuit the metal detection system 200. In some embodiments, the base 240 may be spaced apart above the ferrite tiles 290, for example, at a predetermined vertical distance. In one exemplary embodiment, the predetermined vertical distance may be approximately 5 centimeters (e.g., parallel to...). Figure 2A (Measured in the z-axis direction). In some exemplary embodiments, plastic spacers (not shown) may be used to space the base 240 from the ferrite tile 290 above. In the illustrated embodiment, a plurality of ferrite tiles 290 extend below the base 240 and surround its periphery. It is conceivable that a single ferrite sheet or plate may be used to shield the base 240 from electromagnetic interference.

[0069] Reference Figures 4A to 4B The diagram shows a block diagram representation of another example of a metal detection system 400 according to the present disclosure. The metal detection system 400 is similar to the metal detection system 200 described above. Therefore, for the sake of brevity, descriptions of similar features have been omitted except for the differences mentioned below.

[0070] In this embodiment, the base 440 includes an RX balance control coil 465 (also referred to as a "balanced transmitter coil," "RX balance control loop," or "RX balance coil") attached thereto and operatively connected to the transceiver 480. The balanced transmitter coil 465 is configured to transmit signals (in-phase or out-of-phase) to adjust the balance of the receiver coil 470, for example, if the signal transmitted from the receiver coil 470 is too strong, causing signal distortion due to saturation of the receiver circuitry in the transceiver 470. In such embodiments, it is conceivable that the transceiver 480 can detect whether the receiver coil 470 is unbalanced (via an acknowledgment signal from the receiver coil) and transmit this information to the controller 490 in the form of operational data (indicating that the receiver coil is unbalanced). In some exemplary embodiments, the balanced transmitter coil 465 may be located within the base 440. In other exemplary embodiments, the RX balance control coil may be located within the transceiver 480, rather than within the base 440.

[0071] Still refer to Figures 4A to 4B The controller 490 can be operatively connected to the transceiver 480. In some embodiments, it is contemplated that the controller 490 and the transceiver 480 may form part of a single housing. In some embodiments, it is contemplated that the controller 490 may include the transceiver 480. In some embodiments, the controller 490 may be embodied as a computer, wherein the computer includes a processing unit (processor) 492, system memory (memory) 491, and a system bus for coupling system components, such as a system bus for coupling the processing unit to the system memory. The processing unit may be any of a variety of commercially available processors. Dual microprocessors and other multiprocessor architectures may be used as the processing unit. The system memory 491 may be any available medium accessible by the processor 492. By way of example and not limitation, the system memory 491 includes computer storage media and communication media. Computer storage media may include volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. The processing unit 492 and the system memory 491 may be located on the controller PCB 495 of the controller 490.

[0072] As described below, controller 490 can operate in a networked environment using logical, physical, and / or wireless connections to transceiver 480 and / or to one or more of host device 496 and / or remote device 494. For this purpose, in some embodiments, controller 490 and / or transceiver 480 may include communication devices configured to send and receive commands, signals, and operational data via a communication network. For example, controller 490 and / or transceiver 480 may include hardware (e.g., one or more controllers) to communicate via standards-based protocols / networks (e.g., GSM, UMTS, LTE, CDMA, WiMAX, etc.), satellite communication networks, and / or wireless local area networks (e.g., WiFi, wireless gigabit, etc.). In some examples, controller 490 and / or transceiver 480 may include hardware (e.g., a controller) for personal area networks (e.g., Bluetooth, ZigBee (“IEEE 802.14.4”), near field communication (“NFC”, etc.)) to communicatively couple controller 490 to one or more of transceiver 480 and / or remote device 494 and host device 496.

[0073] In such embodiments, the communication network may be embodied as a wireless network to facilitate communication via wide area networks (e.g., cellular networks such as Global System for Mobile Communications (“GSM”), Universal Mobile Telecommunications System (“UMTS”), Long Term Evolution (“LTE”), Code Division Multiple Access (“CDMA”), etc.), satellite communication networks, WiMAX (“IEEE 802.16m”, etc.) and / or location area networks (e.g., IEEE 802.11m). Communication (e.g., between controller 490 and at least one of transceiver 480, remote device 494, and host device 496) via a / b / g / n / ac, etc. In some examples, controller 490 may be communicatively coupled to a communication network via a public network (such as the Internet, a private network such as an intranet, or a combination thereof). However, in other embodiments, it is contemplated that controller 490 may be communicatively coupled to transceiver 480 (and / or to remote device 494 and host device 496) via a Bluetooth® connection or via another form of direct connection (e.g., a wired physical connection), which should also be considered a type of communication network.

[0074] In one exemplary embodiment, the controller 490 may have, via the controller PCB 495, a wired LAN connection 490a to the Internet, a remote device network connection 490b to a remote device 494, a USB connection 490c to a host device 496, a power electrical connection input 490d to a power supply 498, and a communication (e.g., CAT5) connection to a transceiver 480.

[0075] The controller 490 can be configured to receive operational data from the transceiver 480 in real time corresponding to the electromagnetic field state (i.e., the response signal state). For example, if the electromagnetic field emitted from the transmitter coil 460 and received by the receiver coil 470 is undisturbed based on the absence of EAS-marked shielding material in the detection area, the transceiver 480 will transmit operational data to the controller 490 indicating the same situation (e.g., indicating a state of "OK" because the received response signal is as expected—it has a waveform indicating an electromagnetic field undisturbed by EAS-marked shielding material). Conversely, if the electromagnetic field emitted from the transmitter coil 460 is disturbed based on the presence of EAS-marked shielding material in the detection area, the receiver coil 470 will detect this disturbance (transmitted to the transceiver 480 via a response signal having a waveform indicating an electromagnetic field disturbed by EAS-marked shielding material), at which point the transceiver 480 converts the response signal into operational data indicating the disturbance (e.g., via its processor), which is then transmitted to the controller 490 (e.g., indicating an "ALARM" state). In this manner, controller 490 is operatively connected to transceiver 480 (and thus to transmitter coil 460, receiver coil 470, and RX balance control coil 465). Therefore, controller 490 is configured to receive operational data conveying the operational status of the metal detection system, such as an "OK" or "ALARM" status based on the presence of EAS-marked shielding material in the detection area. In some embodiments, controller 490 can be operatively connected to transceiver 480 via a Cat 5 or Cat 6 communication cable for transmitting operational data between the two.

[0076] In some embodiments, refer to Figure 5 It is conceivable that the controller 590 can be operatively connected to multiple metal detection systems 500 and can include multiple input ports for this purpose. For example, in some embodiments, a first metal detection system 500a may be arranged below the detection area (e.g., in or below the ground), and a second metal detection system 500b may be arranged above the detection area (e.g., in or above the ceiling). In such embodiments, each metal detection system 500a or 500b may include a corresponding transceiver 580, transmitter coil 460 (… Figure 4A ), receiver coil 470 ( Figure 4A ) and RX balance control coil 465 ( Figure 4AArranging two independent metal detection systems on opposite sides of the detection area will improve the level of metal detection. For example, a first metal detection system 500a, located inside or below the ground, can be configured to detect up to approximately 100 cm above the ground. Supplementing system 500a with one or more metal detection systems allows the system to detect the entire detection area between the floor and ceiling.

[0077] Regardless of the number of metal detection systems employed, it should be understood that one or more metal detection systems may operate in conjunction with an EAS system, including transmitters and receivers for detecting EAS markers. In such embodiments, it is anticipated that the EAS system may operate on a different frequency band than the metal detection system to avoid interference between the two.

[0078] Back Figures 4A to 4B The controller 490 can be operatively connected to a power supply 498 adapted to power the controller 490, which in turn indirectly powers the transceiver 480. It is conceivable that the controller 490 and / or the transceiver 480 may each include their own power supply, such as a power cord / physical connector or a rechargeable battery.

[0079] In some embodiments, controller 490 is operatively connected to and configured to activate anti-theft system 493, including but not limited to lights (e.g., strobe lights) and / or sound alarms (e.g., via speakers), to notify employees (or the public) of potential shoplifting attempts. In some embodiments, controller 490 is operatively connected to one or more remote devices 494, for example, to a mobile device of an employee in a store or building where metal detection system 400 is being operated. In such embodiments, it is contemplated that an application (“app”) running on remote device 494 may be operatively connected to controller 490. In this way, controller 490 may cause the app running on the respective remote device 494 to transmit a notification indicating a potential shoplifting attempt (e.g., via sound, tactile vibration). It is also contemplated that remote device 494 may be operatively deactivated (e.g., via a touchscreen button or slider associated with the app), for example, if a potential shoplifting attempt is thwarted (e.g., by loss prevention personnel).

[0080] In some embodiments, the controller 490 may be operatively connected to a host device 496, such as a laptop, desktop computer, tablet, or mobile device of an operator (e.g., a service technician) of the metal detection system 400. In such embodiments, the host device 496 may be operable to debug or otherwise adjust the operating settings of the metal detection system 400. For example, in some embodiments, the host device 496 may be operable to adjust the signal strength of the RX balance coil 465 to reduce distortion in the response signal transmitted by the receiver coil 470. In some embodiments, the host device 496 may be operable to adjust an electromagnetic field, for example, by adjusting the frequency of the interrogation signal within the transmitter coil 460, thereby creating an electromagnetic field in the detection region. The electromagnetic field in the detection region induces a response signal in the receiver coil 470.

[0081] In some embodiments, host device 496 is operable to access an online tool (e.g., a network configurator) to make the aforementioned adjustments. In this way, host device 496 is operated to connect to the online tool via a network (such as a wireless or wired network, e.g., the Internet).

[0082] Reference Figure 6 An example user interface 600 for an online tool for host device 496 is shown. User interface 600 can display operational data transmitted by controller 490, such as the status of metal detection systems 200, 400 (e.g., "OK" or "ALARM" as shown). User interface 600 can also display the electrical characteristics of metal detection systems 200, 400, such as operating voltage or AC frequency transmitted by the respective transmitter and receiver coils. In some exemplary embodiments, user interface 600 can be hosted on controller 490 and deployed via a network interface, making the user interface accessible from devices such as, but not limited to, host device 496 and / or remote device 494.

[0083] Reference Figure 7Another example of the user interface 700 is shown, which graphically displays operational data, including the receiver coil's response signal strength 720, the response signal noise level 722, and / or the metal detection signal 724 (e.g., based on the presence of EAS-marked shielding material), wherein each of the above operational data examples is displayed in real time. In some embodiments, a user of the user interface 600 can adjust the strength of one of the signals transmitted by the transceiver, for example, adjusting the signal transmitted by the RX balancing coil 456 when it is necessary to reduce noise or distortion in the circuitry of the receiver coil 470, or when it is necessary to increase or decrease the strength of the interrogation signal of the transmitter coil 460. The metal detection signal 724 is an indicator of electromagnetic interference, indicating the presence of EAS-marked shielding material in the detection area. In some embodiments, the user interface 700 may include buttons or sliders operable for making the above adjustments, for example, by selecting the buttons or sliders using a pointing device (e.g., a mouse) and / or a touchscreen.

[0084] Reference Figure 8 The image shows a top view of another example metal detection system 800. In this embodiment, the metal detection system 800 includes a controller 890 operatively connected to a plurality of transceivers 840, each transceiver 840 being coupled to a transmitter coil 860 and a receiver coil 870 disposed on a respective vertical base 840. In this way, it should be understood that the various examples of metal detection systems described herein can be arranged in different orientations, for example, in a substantially vertical orientation parallel to a vertical wall, in front of a vertical wall, inside a vertical wall, or behind a vertical wall (e.g., to make it inconspicuous to thieves).

[0085] In some embodiments, one or more magnetometers 850 may be disposed around the base 840. Each magnetometer 850 may be configured to detect interference with the Earth's magnetic field, for example, based on the presence of a metal shopping cart. In some embodiments, it is conceivable that, for this purpose, a control system may be used to distinguish between EAS shielding materials (e.g., tin foil, metal foil) and steel shopping carts (i.e., trolleys), for example, the electronic control system disclosed in U.S. Patent No. 8,976,026 (assigned to the applicant), the entire contents of which are incorporated herein by reference.

[0086] In this way, it should be understood that the magnetometer 850 (e.g., for detecting shopping carts passing through a store entrance) can be used in conjunction with a metal detection system (for detecting EAS shielding material). It is also conceivable that the metal detection system disclosed herein can be used near door entrances, such as sliding or revolving doors in a retail store. In such embodiments, it is conceivable that, for this purpose, the transceiver may include a demodulator (for demodulating signals from a receiver coil), for example, as disclosed in U.S. Patent Nos. 10,796,546 and 10,832,544 (assigned to the applicant), the entire contents of which are incorporated herein by reference.

[0087] Figure 9 This is a flowchart of a method 900 using the detection system 400 according to the present disclosure. In an exemplary embodiment, the method 900 is stored in the memory 491 of the controller 490 and executed by the processor 492 of the controller 490. At 905, the controller 490 receives operation settings from a user, such as via a host device 496. In an exemplary embodiment, the operation settings may include at least one or more of the following: the signal strength of the RX balancing coil 465, the strength of the electromagnetic field 232, and / or the frequency of the interrogation signal.

[0088] In 910, a transceiver 480 generates an interrogation signal in the transmitter coil 440, such as when instructed by the controller 490. This interrogation signal induces an electromagnetic field 232 in the detection area 230. The electromagnetic field 232 in the detection area 230 thus induces an acknowledgment signal in the receiver coil 470. The acknowledgment signal changes in response to interference in the electromagnetic field 232, which indicates the presence of EAS-marked shielding material 231 in the detection area 230.

[0089] In step 915, transceiver 480 receives an acknowledgment signal. In step 920, the acknowledgment signal is analyzed to determine the presence of EAS-marked shielding material 231 in the detection area 230. The analysis of the acknowledgment signal can be performed based on the operating settings received from the user in step 905 and the operating data received from transceiver 480. This analysis can be performed by controller 490 or by controller 490 and transceiver 480.

[0090] In step 925, the detection system status and operational data are output to the user, such as generating an alarm when the EAS marker shielding material 231 is present in the detection area 230. In an exemplary embodiment, generating an alarm may include activating at least one or more of an audible alarm, a light, and / or transmitting a message to a host device 496 and / or a remote device 494 operatively connected to the controller 490. Operational data may also be output to the user via user interfaces 600 and 700. Operational data may include one or more of the following: the signal strength of an acknowledgment signal, the noise level of the acknowledgment signal, and / or a metal detection signal.

[0091] The foregoing includes examples of this disclosure. Of course, for the purposes of describing this disclosure, it is impossible to describe every conceivable combination of components or methods; however, those skilled in the art will recognize that many further combinations and permutations of this disclosure are possible. Each component described above can be combined or added together in any arrangement to define the embodiments disclosed herein. Therefore, this disclosure is intended to include all such changes, modifications, and variations falling within the spirit and scope of the appended claims. Furthermore, where the term “comprising” is used in the detailed description or claims, the term is intended to be included in a manner similar to the term “including,” as is interpreted when “comprising” is used as a transitional word in the claims.

[0092] The structures, proportions, and dimensions in the accompanying drawings are for illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the implementation conditions of this utility model. These details are of no technical significance, and any structural modifications, proportional changes, or dimensional adjustments should be included within the scope of the disclosed technical content, provided they do not affect the function and purpose of this utility model. Furthermore, the expressions "upper," "lower," "left," "right," and "center" used in this document are for illustrative purposes only and are not intended to limit the scope of this utility model. Any changes or adjustments to relative relationships, provided that the technical content remains substantially unchanged, fall within the scope of the disclosed embodiments.

Claims

1. A metal detection system for detecting shielding materials used in Electronic Article Surveillance (EAS) markings, the metal detection system comprising: A transceiver configured to generate an interrogation signal; and A transmitter coil, coupled to the transceiver, is configured to generate an electromagnetic field in a detection area based on the interrogation signal and induce an acknowledgment signal in the receiver coil. as well as A receiver coil is coupled to the transceiver and configured to send the acknowledgment signal to the transceiver, wherein the acknowledgment signal changes when the EAS shielding material is present in the detection area, such that the transceiver determines the presence of the EAS shielding material in the detection area based on the acknowledgment signal, wherein the transmitter coil is coupled to the receiver coil and is substantially concentric, and wherein the transmitter coil and the receiver coil are primarily disposed in a common plane or primarily disposed in a substantially parallel plane.

2. The metal detection system according to claim 1, wherein, The detection area is close to the metal detection system; and The transmitter coil and the receiver coil are located at: Above or within the ceiling, and wherein the basic common plane or the basic parallel plane is substantially parallel to the ceiling; and / or Below or within the ground, and wherein the basic common plane or the basic parallel plane is substantially parallel to the ground.

3. The metal detection according to any one of claims 1 to 2, wherein, The metal detection system also includes an RX balance control coil, which is coupled to the transceiver and configured to adjust the strength of the acknowledgment signal transmitted from the receiver coil to the transceiver.

4. The metal detection system according to any one of claims 1 to 3, wherein, The receiver coil is rotatable relative to the transmitter coil while remaining substantially concentric and located on the substantially common plane or the substantially parallel plane.

5. The metal detection system according to any one of claims 1 to 4, wherein, The detection system also includes a horizontally oriented base that is substantially parallel to the ground, wherein the transmitter coil and the receiver coil are attached to the base.

6. The metal detection system according to any one of claims 1 to 5, further comprising ferrite tiles disposed below the base and configured to shield the detection system from electromagnetic interference.

7. The metal detection system according to any one of claims 1 to 6, wherein, The interrogation signal is a high-frequency AC waveform, which generates the electromagnetic field in the detection area.

8. The metal detection system according to any one of claims 1 to 7, wherein, The transceiver includes a controller configured to convert the response signal into operational data indicating the operational status of the metal detection system.

9. The metal detection system according to any one of claims 1 to 8, wherein, The metal detection system is operatively connected to a host device, which is operable to adjust the response signal transmitted from the receiver coil.

10. The metal detection system according to any one of claims 1 to 9, wherein, The metal detection system also includes a controller operatively connected to the transceiver, the controller being configured to activate at least one or more of an audible alarm and a light and / or transmit messages to a host device and / or a remote device operatively connected to the controller.

11. A detection system for detecting shielding materials used in Electronic Article Surveillance (EAS) tags, the detection system comprising: A detection base comprising a transmitter coil and a receiver coil, the transmitter coil and the receiver coil being substantially concentric and disposed in or substantially parallel to a common plane. The transmitter coil is configured to generate an electromagnetic field toward a detection area proximate to the detection base based on an interrogation signal. The receiver coil is configured to generate a response signal that varies in response to interference in the electromagnetic field, the interference indicating the presence of EAS metallic shielding material in the detection area. A controller, operatively connected to the detection base, is configured to activate at least one of an audible alarm and / or a visual alarm when the receiver coil generates a response signal indicating the presence of EAS-marked shielding material passing through the detection area.

12. The detection system according to claim 11, wherein, The detection base also includes an RX balance control coil configured to adjust the strength of the response signal transmitted from the receiver coil.

13. The detection system according to any one of claims 11 to 12, wherein, The detection system also includes a host device operatively connected to the controller, the host device being operable to adjust the strength of the response signal transmitted from the receiver coil.

14. The detection system according to claim 13, wherein, The host device includes a user interface operable to adjust the strength of the interrogation signal and / or the response signal.

15. The detection system according to any one of claims 1 to 14, wherein, The one or more planes are substantially parallel to the vertical wall.

16. A detection system for detecting shielding materials used in Electronic Article Surveillance (EAS) tags, the detection system comprising: A controller communicating with a transmitter coil and a receiver coil, wherein the transmitter coil and the receiver coil are coupled, substantially concentric, and primarily arranged in a substantially common plane or substantially parallel plane. The controller has a processor and a memory, the memory storing executable code that, when executed by the processor, performs the following actions: Receive operation settings from the user; An interrogation signal is generated in the transmitter coil, thereby causing the transmitter coil to generate an electromagnetic field toward the detection area; The receiver coil receives an acknowledgment signal, wherein the acknowledgment signal is induced by the electromagnetic field, and wherein the acknowledgment signal changes in response to interference in the electromagnetic field, the interference indicating the presence of EAS-marked shielding material in the detection area; The presence of EAS-marked shielding material in the detection area is determined using operational data including the response signal; Output the detection system status to the user, wherein the detection system status includes generating an alarm when the EAS-marked shielding material is present in the detection area; The detection area is located close to the detection system; Wherein, the transmitter coil and the receiver coil are located at: Above or within the ceiling, and wherein a fundamental common plane or fundamental parallel plane is substantially parallel to the ceiling, and / or Below or within the ground, and wherein the basic common plane or the basic parallel plane is substantially parallel to the ground.

17. The detection system according to claim 16, wherein, The detection system also includes an RX balance control coil, which is coupled to the transceiver and configured to adjust the strength of the acknowledgment signal transmitted from the receiver coil to the transceiver.

18. The detection system according to any one of claims 16 to 17, wherein, Generating an alarm includes activating at least one or more of an audible alarm, a light, and / or transmitting a message to a host device and / or a remote device that is operationally connected to the controller.

19. The detection system according to any one of claims 16 to 18, wherein, The receiver coil is rotatable relative to the transmitter coil while remaining substantially concentric and located on the substantially common plane or the substantially parallel plane.

20. The detection system according to any one of claims 16 to 19, wherein, The operation settings include at least one of the following: the signal strength of the RX balancing coil, the strength of the electromagnetic field, and / or the frequency of the interrogation signal; The operation data is output to the user, and the operation data includes at least one of the following: the signal strength of the response signal, the noise level of the response signal, and / or the metal detection signal.

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