CN114594520A - Foreign matter detection device and method - Google Patents
Foreign matter detection device and method Download PDFInfo
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- CN114594520A CN114594520A CN202210275979.8A CN202210275979A CN114594520A CN 114594520 A CN114594520 A CN 114594520A CN 202210275979 A CN202210275979 A CN 202210275979A CN 114594520 A CN114594520 A CN 114594520A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
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- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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Abstract
The embodiment of the application relates to a foreign matter detection device and a method thereof, wherein the detection device comprises a detection antenna, and the detection antenna comprises a first detection unit and a second detection unit, the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign matter, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign matter, and the detection antenna is used for outputting the sum of the first induced electromotive force and the second induced electromotive force; the detection circuit is connected with the detection antenna and used for receiving the sum of the electromotive forces and generating a sine signal, and the amplitude of the generated sine signal corresponds to the sum of the electromotive forces; and the processor is connected with the detection circuit and used for receiving the sinusoidal signal and acquiring the relative position relationship between the detection antenna and the charged foreign matter according to the sinusoidal signal.
Description
Technical Field
The embodiment of the application relates to the technical field of metal detection, in particular to a foreign matter detection device and a method thereof.
Background
At present, often need in the building body upgrading transformation or the maintenance construction process cutting or drilling operation in positions such as wall floor, bury electrified foreign matter such as electric wire in order to guarantee beautifully in the wall usually. When the maintenance and reconstruction operation is faced, the precise position of objects such as electric wires hidden in the building body cannot be known usually, so how to avoid damaging the cables hidden in the building body becomes a big pain point for the current building upgrading and reconstruction maintenance constructors. When the cable cannot be effectively avoided during construction, the building function can be failed or life safety can be hurt.
The existing identification of the charged foreign matters usually uses a lead or a copper foil as an antenna to detect electric field signals of the charged foreign matters, a detection circuit amplifies the detected antenna signals, and a Microprocessor (MCU) module samples the amplified signals and extracts effective amplitude of the signals after digital filtering to judge whether alternating current exists or not and judge position information. The detection modes have low induction sensitivity to alternating current and are not accurate enough for judging the position of an alternating current electric wire.
Disclosure of Invention
The embodiment of the application provides a foreign matter detection device and a method thereof, and the detection precision of the charged foreign matter in the wall body can be optimized through detecting the near-field magnetic field of the charged foreign matter in the wall body.
A foreign matter detection device comprising:
the detection antenna comprises a first detection unit and a second detection unit, wherein the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the detection antenna is used for outputting the sum of the first induced electromotive force and the second induced electromotive force;
the detection circuit is connected with the detection antenna and used for receiving the sum of the electromotive forces and generating a sine signal, and the amplitude of the generated sine signal corresponds to the sum of the electromotive forces;
and the processor is connected with the detection circuit and used for receiving the sinusoidal signal and acquiring the relative position relationship between the detection antenna and the charged foreign matter according to the sinusoidal signal.
In one embodiment, the first detection unit is connected to the second detection unit, one of the first detection unit and the second detection unit is connected to a reference voltage terminal, and the other of the first detection unit and the second detection unit is connected to the detection circuit.
In one embodiment, the first detection unit comprises a first sensing part and a second sensing part which are connected, the second detection unit comprises a third sensing part and a fourth sensing part which are connected, the third sensing part is close to the first detection unit, the fourth sensing part is far away from the first detection unit, the second sensing part is close to the second detection unit, and the first sensing part is far away from the second detection unit;
the length of the first induction part is greater than that of the second induction part, and the length of the third induction part is greater than that of the fourth induction part.
In one embodiment, the length of the first sensing part is equal to the length of the third sensing part, and the length of the second sensing part is equal to the length of the fourth sensing part.
In one embodiment, the foreign object detection apparatus includes a plurality of first sensing units connected to each other and a plurality of second sensing units connected to each other, the plurality of first sensing units are configured to output one of the first induced electromotive forces in common, and the plurality of second sensing units are configured to output one of the second induced electromotive forces in common.
In one embodiment, the number of the first sensing units is equal to the number of the second sensing units.
In one embodiment, the detection circuit includes an operational amplifier, a reference voltage generation unit, a first capacitor, and a first resistor; wherein the content of the first and second substances,
the non-inverting input end of the operational amplifier is connected with the reference voltage generating unit, the inverting input end of the operational amplifier is connected with the detection antenna through the first capacitor, the output end of the operational amplifier is used for outputting the sinusoidal signal, and two ends of the first resistor are respectively connected with the inverting input end of the operational amplifier and the output end of the operational amplifier.
In one embodiment, the reference voltage generating unit includes:
the second resistor is respectively connected with a power supply voltage end and the non-inverting input end of the operational amplifier;
and the third resistor is respectively connected with a grounding end and the non-inverting input end of the operational amplifier.
In one embodiment, the inductive antenna is a printed antenna or a wound antenna.
A foreign object detection method comprising:
the detection antenna comprises a first detection unit and a second detection unit, wherein the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the sum of the electromotive forces is the sum of the first induced electromotive force and the second induced electromotive force;
and acquiring the relative position relation between the detection antenna and the charged foreign matter according to the sinusoidal signal.
The foreign matter detection device and the method thereof comprise a detection antenna, wherein the detection antenna comprises a first detection unit and a second detection unit, the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of the charged foreign matter, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign matter, and the detection antenna is used for outputting the sum of the first induced electromotive force and the second induced electromotive force; the detection circuit is connected with the detection antenna and used for receiving the sum of the electromotive forces and generating a sine signal, and the amplitude of the generated sine signal corresponds to the sum of the electromotive forces; and the processor is connected with the detection circuit and used for receiving the sinusoidal signal and acquiring the relative position relationship between the detection antenna and the charged foreign matter according to the sinusoidal signal. Because the relative position relations between the first detection unit and the charged foreign matter and between the second detection unit and the charged foreign matter are different, the first induced electromotive force generated by the first detection unit is not identical to the second induced electromotive force generated by the second detection unit, and the direction of the induced electromotive force is changed correspondingly. Therefore, the sum of the electromotive forces can reflect not only the amplitude condition of the two induced electromotive forces, but also the direction condition of the induced electromotive forces. That is, the generated sinusoidal signal can reflect the above situation, and the relative position relationship between the detection antenna and the charged foreign object can be accurately obtained by analyzing the sinusoidal signal.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a foreign object detection apparatus according to an embodiment;
FIG. 2 is a schematic structural diagram of a detecting antenna according to an embodiment;
FIG. 3 is a schematic diagram of induced electromotive forces corresponding to different relative positional relationships between the detection antenna and the charged object;
FIG. 4 is a graph of antenna signal strength versus wire position distribution according to one embodiment;
FIG. 5 is a circuit diagram of a detection circuit according to an embodiment.
Element number description:
detecting an antenna: 100, respectively; a first detection unit: 110; a second detection unit: 120 of a solvent; the detection circuit: 200; a reference voltage generation unit: 211; a processor: 300.
Detailed Description
To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. The embodiments of the present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application belong. The terminology used herein in the description of the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.
Fig. 1 is a block diagram illustrating a structure of a foreign object detection apparatus according to an embodiment, and referring to fig. 1, the foreign object detection apparatus includes a detection antenna 100, a detection circuit 200, and a processor 300.
The detection antenna 100 includes a first detection unit 110 and a second detection unit 120, the first detection unit 110 is configured to generate a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit 120 is configured to generate a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the detection antenna 100 is configured to output a sum of the first induced electromotive force and the second induced electromotive force. The detection circuit 200 is connected to the detection antenna 100, and is configured to receive the sum of the electromotive forces and generate a sinusoidal signal, where an amplitude of the generated sinusoidal signal corresponds to the sum of the electromotive forces. The processor 300 is connected to the detection circuit 200, and is configured to receive the sinusoidal signal and obtain a relative position relationship between the detection antenna 100 and the charged foreign object according to the sinusoidal signal.
In this embodiment, since the relative positional relationship between the first detection unit 110 and the second detection unit 120 and the charged foreign object is different, the first induced electromotive force generated by the first detection unit 110 is not identical to the second induced electromotive force generated by the second detection unit 120, and the direction of the induced electromotive force is also changed accordingly. Therefore, the sum of the electromotive forces can reflect not only the amplitude condition of the two induced electromotive forces, but also the direction condition of the induced electromotive forces. That is, the generated sinusoidal signal can reflect the above situation, and the relative position relationship between the detection antenna 100 and the charged foreign object can be accurately obtained by analyzing the sinusoidal signal.
In one embodiment, the first detecting unit 110 is connected to the second detecting unit 120, one of the first detecting unit 110 and the second detecting unit 120 is connected to a reference voltage terminal, and the other of the first detecting unit 110 and the second detecting unit 120 is connected to the detecting circuit 200. For example, the first detecting unit 110 may be connected to the reference voltage terminal, and the second detecting unit 120 may be connected to the detecting circuit 200. Taking the reference voltage terminal as the ground terminal as an example, if the sum of the electromotive forces is a positive value, the second detecting unit 120 outputs the positive induced electromotive force to the detecting circuit 200; if the sum of the electromotive forces is a negative value, the second detecting unit 120 outputs a negative induced electromotive force to the detecting circuit 200. The processor 300 may obtain the relative position relationship between the first and second detection units 110 and 120 and the charged foreign objects based on the sum of the voltage value of the reference voltage terminal and the received electromotive force.
Fig. 2 is a schematic structural diagram of the detection antenna 100 according to an embodiment, and referring to fig. 2, it provides 8 structures of the detection antenna 100, the first detection unit 110 includes a first sensing portion (i.e., a '″ to a ″' segment in each figure) and a second sensing portion (i.e., a 'to a ″ segment in each figure) connected to each other, and the second detection unit 120 includes a third sensing portion (i.e., B' ″ to B ″ 'segment in each figure) and a fourth sensing portion (i.e., B' to B ″ segment in each figure) connected to each other. The third sensing portion is close to the first detecting unit 110, the fourth sensing portion is far from the first detecting unit 110, the second sensing portion is close to the second detecting unit 120, and the first sensing portion is far from the second detecting unit 120. The length of the first induction part is greater than that of the second induction part, and the length of the third induction part is greater than that of the fourth induction part. Accordingly, the area of the graphic enclosed by A-A 'is smaller than the area of the graphic enclosed by A' -A ', A', and the area enclosed by B-B 'B' is smaller than the area of the graphic enclosed by B '-B'. It should be understood that the trace is shown in the drawings as a horizontal or vertical direction for convenience of description, the actual trace may be in any other direction or an arc, and the rotation angle is not limited to a right angle and may be any angle. The detecting antenna 100 has two lead-out ports, one of which is led out from one of A, A ', a ", or a'", and the other of which is led out from one of B, B ', B ", or B'", so as to be connected to a reference voltage terminal and the detecting circuit 200, respectively.
The detection antenna 100 in fig. 2 (f) is exemplarily illustrated. Fig. 3 is a schematic diagram of induced electromotive forces corresponding to different relative positional relationships between the detection antenna 100 and a charged object, where the charged object in fig. 3 is a wire. When the alternating current electric wire is distant from the detection antenna 100, it is assumed that the current flowing through the alternating current electric wire is from bottom to top at a certain time and the current increases. If the ac power line is located on the left side of the detecting antenna 100, as shown in fig. 3(a), the total electromotive force of a-a '-a "-a'" -a "" a '"is positive, negative, and the total electromotive force of B-B' -B" -B '"" is positive, negative, and negative, because B-B' -B "-B '" "is farther away from the ac power line than a-a' -a" -a '"-a" "-a'", and the magnetic induction intensity is smaller, the induced electromotive force of B-B ' - … … -A ' -A ' -A connected in series is also B positive and A negative. When the alternating current electric wire gradually approaches the detection antenna 100, the magnetic induction intensity of the area where the antenna is located gradually increases, and the amplitude of the signal detected by the detection antenna 100 gradually increases. As shown in fig. 3(B), when the ac electric wire is close to the axis of the detecting antenna 100, the signals detected on the left and right sides of the detecting antenna 100 are not cancelled but enhanced, and when the total electromotive force of a-a ' -a "-a '" -a "" "is positive, negative, and upper, and negative, and the total electromotive force of B-B ' -B" -B ' "" is positive, negative, and upper (because the directions of the magnetic lines on the left and right sides of the axis are opposite), the induced electromotive force of B-B ' -B "-B '" "- … … -a '" "" -a ' "-a '" in series is enhanced, negative, and positive, B, and the amplitude of the signal detected by the detecting antenna 100 is maximized. If the ac power line is located on the right side of the detecting antenna 100 as shown in fig. 3(c), there is an increased magnetic field on the left side of the ac power line, and induced electromotive forces of up-negative and down-positive are generated on a-a '-a "-a'" and B-B '-B "-B'", and induced electromotive forces of up-positive and down-negative are generated on a "-a '" -a "" -a' "and B" -B '"-B" "-B'". Since the area of the pattern enclosed by A-A '(B-B') is smaller than the area of the pattern enclosed by A '-A' -A '(B' -B ') the total electromotive force of A-A' -A 'is positive and negative, and the total electromotive force of B-B' is positive and negative. And because B-B ' is closer to the alternating current electric wire than A-A ' is, the magnetic induction intensity is larger, so the induced electromotive force of the series connection of B-B ' - … … -A ' -A ' -A is B positive and A negative.
Also, when the alternating current electric wire is distant from the detection antenna 100, the signals detected at the left and right sides of the detection antenna 100 are substantially cancelled, and the absolute value of the signal amplitude is small. Therefore, in the present embodiment, with reference to fig. 4 in combination, based on the structure of the detection antenna 100 described above, the precise position of the alternating-current electric wire, that is, the position where the signal intensity is the greatest, can be accurately determined as the position of the charged foreign object.
In one embodiment, with continued reference to fig. 2, the foreign object detection apparatus includes a plurality of the first sensing units connected and a plurality of the second sensing units connected. Each of the detecting antennas 100 in fig. 2 includes two or three first sensing units, respectively, and two or three second sensing units, respectively. The plurality of first induction units are used for outputting one first induction electromotive force together, and the plurality of second induction units are used for outputting one second induction electromotive force together. It is understood that the number of sensing units is also used as a basic parameter for the operation and analysis performed by the processor 300. In this embodiment, by providing a plurality of the first sensing units and a plurality of the second sensing units, the amplitudes of the first induced electromotive force and the second induced electromotive force can be increased, so as to avoid the situation that the detection result is wrong due to the insufficient sensitivity of the detection circuit 200. In one embodiment, the number of the first sensing units is equal to the number of the second sensing units.
Fig. 5 is a circuit diagram of a detection circuit 200 according to an embodiment, and referring to fig. 5, in one embodiment, the detection circuit 200 includes an operational amplifier, a reference voltage generation unit 211, a first capacitor, and a first resistor R1. The non-inverting input end of the operational amplifier is connected to the reference voltage generating unit 211, the inverting input end of the operational amplifier is connected to the detecting antenna through the first capacitor, the output end of the operational amplifier is configured to output the sinusoidal signal, and two ends of the first resistor are respectively connected to the inverting input end of the operational amplifier and the output end of the operational amplifier. Specifically, the sensing signal is connected to the inverting input terminal of the operational amplifier of the detection circuit 200 by ac coupling, and is amplified to obtain a sinusoidal signal with a specific frequency (usually 50Hz to 60Hz, and the specific frequency is determined by the frequency of the signal in the detected live wire), so that the signal amplitude is related to the distance between the center of the detection antenna 100 and the ac power wire. That is, the closer the distance is, the larger the signal is, and the farther the distance is, the smaller the signal is, and after the processor 300 performs sampling, digital filtering and digital signal processing on the sinusoidal signal, the frequency and effective amplitude of the signal can be extracted and whether there is an electrified foreign object with alternating current can be determined. In this embodiment, through the above structure, the sensing signal can be accurately converted into a sinusoidal signal with a corresponding amplitude, and noise in the sensing signal is filtered to a certain extent, so that a sinusoidal signal which is easier to detect is output.
With continued reference to fig. 5, in one embodiment, the reference voltage generating unit 211 includes a second resistor R2 and a third resistor R3. The second resistor R2 is respectively connected with the power supply voltage end and the non-inverting input end of the operational amplifier. And a third resistor R3 connected to a ground terminal and a non-inverting input terminal of the operational amplifier, respectively. In the present embodiment, based on the above circuit structure, the required reference voltage can be accurately provided.
In one embodiment, the inductive antenna is a printed antenna.
In one embodiment, the inductive antenna is a wound antenna.
The embodiment of the application also provides a foreign matter detection method, which comprises the following steps: the detection antenna 100 comprises a first detection unit 110 and a second detection unit 120, wherein the first detection unit 110 is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit 120 is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the sum of the electromotive forces is the sum of the first induced electromotive force and the second induced electromotive force; and acquiring the relative position relationship between the detection antenna 100 and the charged foreign matter according to the sinusoidal signal.
Based on the same inventive concept, the embodiment of the application also provides a foreign matter detection device for realizing the foreign matter detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so the specific limitations in one or more embodiments of the foreign object detection device provided below can be referred to the limitations on the foreign object detection method in the above, and are not described herein again.
In one embodiment, as shown in the foreign object detection, there is provided a foreign object detection apparatus including: the device comprises a sinusoidal signal acquisition module and a position analysis module. Wherein, the sinusoidal signal acquiring module is used for acquiring a sinusoidal signal generated by the detecting circuit 200 in response to the sum of the electromotive forces output by the detecting antenna 100. The amplitude of the sinusoidal signal corresponds to the sum of the electromotive forces, the detection antenna 100 includes a first detection unit 110 and a second detection unit 120, the first detection unit 110 is configured to generate a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit 120 is configured to generate a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the sum of the electromotive forces is the sum of the first induced electromotive force and the second induced electromotive force. The position analysis module is configured to obtain a relative position relationship between the detection antenna 100 and the charged foreign object according to the sinusoidal signal.
Each module in the foreign object detection apparatus may be wholly or partially implemented by software, hardware, or a combination thereof. The modules may be embedded in the processor 300 or independent from the electronic device in a hardware form, or may be stored in a memory of the electronic device in a software form, so that the processor 300 can call and execute operations corresponding to the modules.
In one embodiment, an electronic device is provided, which may be a terminal. The electronic device includes a processor 300, a memory, a communication interface, a display screen, and an input device connected through a system bus. Wherein the processor 300 of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through BT (Bluetooth), WIFI/WLAN (wireless local area network), mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by the processor 300 to implement a foreign object detection method. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the above-described architecture is merely a block diagram of some of the structures associated with the present application and is not intended to limit the electronic devices to which the present application may be applied, and that a particular electronic device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, an electronic device is provided, which includes a memory and a processor 300, wherein the memory stores a computer program, and the processor 300 implements the steps of the above method embodiments when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor 300, carries out the steps of the above-mentioned method embodiments.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor 300, performs the steps of the above-described method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processor 300 referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above embodiments only express several implementation manners of the embodiments of the present application, and the descriptions are specific and detailed, but should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present application, and these embodiments are within the scope of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the appended claims.
Claims (10)
1. A foreign matter detection device, characterized by comprising:
the detection antenna comprises a first detection unit and a second detection unit, wherein the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the detection antenna is used for outputting the sum of the first induced electromotive force and the second induced electromotive force;
the detection circuit is connected with the detection antenna and used for receiving the sum of the electromotive forces and generating a sine signal, and the amplitude of the generated sine signal corresponds to the sum of the electromotive forces;
and the processor is connected with the detection circuit and used for receiving the sinusoidal signal and acquiring the relative position relation between the detection antenna and the charged foreign matter according to the sinusoidal signal.
2. The foreign object detection device according to claim 1, wherein the first detection unit is connected to the second detection unit, one of the first detection unit and the second detection unit is connected to a reference voltage terminal, and the other of the first detection unit and the second detection unit is connected to the detection circuit.
3. The foreign object detection device according to claim 1, wherein the first detection unit includes a first sensing portion and a second sensing portion connected, the second detection unit includes a third sensing portion and a fourth sensing portion connected, the third sensing portion is close to the first detection unit, the fourth sensing portion is far from the first detection unit, the second sensing portion is close to the second detection unit, and the first sensing portion is far from the second detection unit;
the length of the first induction part is greater than that of the second induction part, and the length of the third induction part is greater than that of the fourth induction part.
4. The foreign matter detection device according to claim 3, wherein a length of the first sensing portion is equal to a length of a third sensing portion, and a length of the second sensing portion is equal to a length of a fourth sensing portion.
5. The foreign matter detection device according to claim 1, characterized in that the foreign matter detection device includes a plurality of the first induction units connected to output one of the first induced electromotive forces in common and a plurality of the second induction units connected to output one of the second induced electromotive forces in common.
6. The foreign object detection device according to claim 5, wherein the number of the first sensing units is equal to the number of the second sensing units.
7. The foreign object detection device according to claim 1, wherein the detection circuit includes an operational amplifier, a reference voltage generation unit, a first capacitor, and a first resistor; wherein the content of the first and second substances,
the non-inverting input end of the operational amplifier is connected with the reference voltage generating unit, the inverting input end of the operational amplifier is connected with the detection antenna through the first capacitor, the output end of the operational amplifier is used for outputting the sinusoidal signal, and two ends of the first resistor are respectively connected with the inverting input end of the operational amplifier and the output end of the operational amplifier.
8. The foreign object detection device according to claim 7, wherein the reference voltage generation unit includes:
the second resistor is respectively connected with a power supply voltage end and the non-inverting input end of the operational amplifier;
and the third resistor is respectively connected with a grounding end and the non-inverting input end of the operational amplifier.
9. The device according to any one of claims 1 to 8, wherein the induction antenna is a printed antenna or a wound antenna.
10. A foreign object detection method, comprising:
the detection antenna comprises a first detection unit and a second detection unit, wherein the first detection unit is used for generating a first induced electromotive force under the action of a magnetic field of a charged foreign object, the second detection unit is used for generating a second induced electromotive force under the action of the magnetic field of the charged foreign object, and the sum of the electromotive forces is the sum of the first induced electromotive force and the second induced electromotive force;
and acquiring the relative position relation between the detection antenna and the charged foreign matter according to the sinusoidal signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114882520A (en) * | 2022-07-08 | 2022-08-09 | 成都西交智汇大数据科技有限公司 | Method, system and equipment for detecting circuit diagram and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114882520A (en) * | 2022-07-08 | 2022-08-09 | 成都西交智汇大数据科技有限公司 | Method, system and equipment for detecting circuit diagram and readable storage medium |
| CN114882520B (en) * | 2022-07-08 | 2022-11-11 | 成都西交智汇大数据科技有限公司 | Method, system and equipment for detecting circuit diagram and readable storage medium |
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