A device, system, and method for detecting metals and biological entities

Abstract

The present disclosure provides a metal and biological body detection device, system and method, comprising a detection coil, a comb-shaped capacitor and a signal generator connected in series, the detection coil is placed in overlap with the comb-shaped capacitor; the signal generator is used to provide an electrical signal with a set resonant frequency for the detection coil and the comb-shaped capacitor. The comb-shaped capacitor can output a larger parameter change when detecting a biological body, can amplify the change at both ends of the coil, realize the detection of the biological body, and at the same time, the detection coil is provided to realize the detection of a metal object, the detection coil is placed in overlap with the comb-shaped capacitor, which can cover the same detection area, and the integrated setting realizes the detection of the metal and the biological body.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of metal and organism detection, and in particular, to a metal and organism detection device, system and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute the prior art.

[0003] In recent years, metal and organism detection technology has attracted widespread attention from all walks of life. In many fields, for safety reasons, detecting and identifying metals and organisms in the region has become an essential auxiliary function in these fields, and even restricts the development of certain fields. Therefore, it is necessary to conduct in-depth research on metal and organism detection technology.

[0004] At present, the metal and organism detection technology at home and abroad is still in the initial research stage. Compared with organism detection technology, metal detection technology develops faster. This is mainly because most research institutions focus their efforts on the research of metal detection technology, and less on the research of organism detection technology. The existing organism detection technology is mainly based on temperature, pressure and other sensors, which has high cost, easy-to-damage equipment, high requirements for installation location, high cost, low detection precision and low reliability. The existing metal detection and organism detection are carried out separately, and the sensitivity of the device capable of simultaneously detecting metal and organism is low. SUMMARY

[0005] In order to solve the above problems, the present disclosure provides a metal and organism detection device, system and method, which realizes the integration design of metal detection and organism detection, reduces the complexity of the detection system, and improves the structure of the detection circuit based on the comb-shaped capacitor to realize high-sensitivity detection.

[0006] In order to achieve the above purpose, the present disclosure adopts the following technical solutions:

[0007] One or more embodiments provide a metal and organism detection device, which includes a detection coil, a comb-shaped capacitor and a signal generator connected in series, the detection coil and the comb-shaped capacitor are placed in overlap; the signal generator is used to provide a set resonant frequency electrical signal for the detection coil and the comb-shaped capacitor.

[0008] Compared with the prior art, the present disclosure has the following beneficial effects:

[0009] The detection device of the present disclosure adopts a comb-shaped capacitor to detect a living body, can output with a larger parameter change, can amplify the change at both ends of the coil, realize the detection of the living body, and simultaneously set a detection coil to realize the detection of a metal object. The detection coil and the comb-shaped capacitor are placed in an overlapping manner, can cover the same detection area, and the integrated setting simultaneously realizes the detection of the metal and the living body.

[0010] The advantages of the present disclosure and the advantages of additional aspects will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings, which form a part of the present disclosure, are used to provide further understanding of the present disclosure, and the schematic embodiments of the present disclosure and the description thereof are used to explain the present disclosure, and do not constitute limitations on the present disclosure.

[0012] Figure 1 is a principle diagram of the detection device of the embodiment 1 of the present disclosure;

[0013] Fig. 2(a) is a structure top view of the setting of the detection coil D and the comb-shaped capacitor C2 of the embodiment 1 of the present disclosure;

[0014] Fig. 2(b) is a front view of the setting of the detection coil D and the comb-shaped capacitor C2 of the embodiment 1 of the present disclosure;

[0015] Fig. 2(c) is a bottom view of the setting of the detection coil D and the comb-shaped capacitor C2 of the embodiment 1 of the present disclosure;

[0016] Figure 3 is a structure schematic diagram of the comb-shaped capacitor C2 of the embodiment 1 of the present disclosure;

[0017] Figure 4 is a structure schematic diagram of the array type detection coil of the detection system of the embodiment 2 of the present disclosure;

[0018] Figure 5 is a system block diagram of the detection system of the embodiment 2 of the present disclosure;

[0019] Figure 6 is a flow chart of the detection method of the embodiment 3 of the present disclosure. DETAILED DESCRIPTION

[0020] The present disclosure will be further described below in combination with the drawings and embodiments.

[0021] It should be pointed out that the following detailed description is exemplary, and is intended to provide further description of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present disclosure belongs.

[0022] It is to be noted that the terms used herein are merely for describing specific embodiments and are not intended to limit exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components, and / or combinations thereof. It is to be noted that the various embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1

[0024] In the technical solutions disclosed in one or more embodiments, as shown in Figure 1 A detection device for metal and living beings includes a detection coil D, a comb-shaped capacitor C2 and a signal generator connected in series, the detection coil D is placed in overlap with the comb-shaped capacitor C2; the signal generator serves as a signal source for providing the detection coil D and the comb-shaped capacitor C2 with an electrical signal with a set resonant frequency.

[0025] The detection device provided by the embodiment can output a larger parameter change when detecting living beings, can amplify the change at both ends of the coil, and realize the detection of living beings. Meanwhile, the detection coil is arranged to realize the detection of metal objects. The detection coil and the comb-shaped capacitor are placed in overlap, which can cover the same detection area and realize the detection of metal and living beings in an integrated manner.

[0026] The detection principle of the embodiment is as shown in Figure 1 Based on the series resonant circuit of inductance and capacitance, the resonant frequency is megahertz. The metal can be approximately equivalent to an RL model, and the living beings can be approximately equivalent to an RC model. Figure 1 The left side is the detection circuit part, and the right side is the equivalent circuit part of the metal and the living beings. When the metal and the living beings enter the detection area, the mutual inductance effect changes the original distribution of the high-frequency magnetic field, thereby changing the value of the coil inductance L D or the coil capacitance C D , and further changing the voltage at both ends of the coil.

[0027] The equivalent capacitance C D of the coil often reaches tens or hundreds of microfarads, which is too large compared with the capacitance change caused by the living beings, and the detection sensitivity is low. Due to the structural characteristics of the comb-shaped capacitor, the capacitance parameter change caused by the living beings is greater than that of other encapsulated capacitors of the same level when the circuit resonates, thereby amplifying the voltage change at both ends of the coil and effectively improving the detection sensitivity of the system.

[0028] The comb-shaped capacitor is a key for the foreign matter detection system to detect the living body, and the structural parameters of the comb-shaped capacitor affect the sensitivity of the foreign matter detection system to detect the foreign matter of the living body. Therefore, the comb-shaped capacitor is optimized and designed to obtain the best detection capacitor.

[0029] Further, the comb-shaped capacitor C2 is arranged above or below the detection coil, preferably, the comb-shaped capacitor C2 is arranged above the detection coil and is closer to the detection area, which is higher in the recognition degree of the living body and ensures the detection of the metal object.

[0030] In some embodiments, as shown in Figure 3 The comb-shaped capacitor C2 includes two oppositely arranged comb-shaped capacitor plates, each of which includes a transverse electrode plate and a plurality of longitudinal electrode plates arranged on the transverse electrode plate and perpendicular to the transverse electrode plate, and each longitudinal electrode plate of the two opposite comb-shaped capacitor plates is arranged in pairs.

[0031] The thickness d5 of the comb-shaped capacitor plate is not greater than a set thickness, and the set thickness can be less than 1 mm.

[0032] Optionally, the longitudinal electrode plates of the two opposite comb-shaped capacitor plates are spaced apart by a set first distance d3 or d4. Preferably, d3 and d4 are equal. The first distance can be set to 5 mm.

[0033] Optionally, the length l of the transverse electrode plate of the comb-shaped capacitor is greater than the longitudinal electrode plate d, and in this embodiment, l = 2d.

[0034] Optionally, the adjacent longitudinal electrode plates of the same comb-shaped capacitor plate are spaced apart by a set second distance, and the set second distance can be equal, such as d3, d4 and d5 in the figure.

[0035] Optionally, the distance between the longitudinal electrode plate of one of the two comb-shaped capacitor plates and the transverse electrode plate of the other comb-shaped capacitor plate is a set third distance d1 or d2. The third distance can be set to 5 mm.

[0036] The further technical solution further includes a compensation capacitor C1 connected in series with the comb-shaped capacitor; and the capacitance value of the series compensation capacitor is set according to the circuit resonance frequency.

[0037] Since the structure of the comb-shaped capacitor is determined once, the capacitance value remains unchanged. This embodiment proposes to connect a compensation capacitor in series in the detection circuit on the basis of using the comb-shaped capacitor as the resonance capacitor. The compensation capacitor can adjust the total capacitance value of the detection circuit, which is conducive to improving the detection sensitivity of the system. Moreover, the circuit resonance frequency is different when the series compensation capacitor is different. Therefore, the circuit resonance frequency can be selected by changing the series compensation capacitor to meet the actual needs of different applications.

[0038] Further technical solutions also include a compensation resistor R1 connected in series with the comb-shaped capacitor C2.

[0039] The specific principle is as follows: Figure 1 In the formula, U D The detection excitation source is provided by a signal generator, and the working frequency is ω D , which is usually set to several megahertz. r represents the internal resistance of the detection excitation source. D , I X are the detection circuit current and the equivalent circuit current, respectively, and the positive direction of each current is shown in the above figure. D , L X represent the equivalent inductance of the detection coil and the inductance of the equivalent circuit, respectively, R1 and C1 represent the compensation resistor and the compensation capacitor of the detection circuit, respectively, C2 represents the comb-shaped capacitor, R X represents the equivalent resistance of the equivalent circuit, and C D , R D represent the equivalent capacitance and the equivalent resistance of the detection coil, and M DX represents the mutual inductance of the foreign object detection coil and the foreign object.

[0040] In some embodiments, the detection coil D adopts a double-D coil structure, and the two adjacent square coils are connected in anti-series. The structure is shown in FIG. 2. The dashed line in the figure represents the detection coil, and the upper layer is the comb-shaped capacitor C2, and the lower layer is the two square coils connected in anti-series.

[0041] Optionally, the detection coil D is implemented by being arranged on a pcb circuit board. In actual application, the coil can be equivalent to an RLC model, and each equivalent parameter will change accordingly with the change of the magnetic field.

[0042] Further comprising a detection control unit, including a voltage signal detection unit, a signal preprocessing unit and a single-chip microcomputer connected in sequence.

[0043] The signal detection unit is connected to the series circuit of the detection coil and the comb-shaped capacitor, and is used to collect the voltage signal of the series circuit.

[0044] The signal preprocessing unit is used to preprocess the collected voltage signal, and the preprocessing includes isolation, filtering, amplification and rectification processing.

[0045] The single-chip microcomputer is used to calculate the transformation quantity of voltage or current according to the collected voltage signal, determine whether the detected object is a metal or a living body according to the voltage variation range caused by the metal and the voltage variation range caused by the living body.

[0046] Embodiment 2

[0047] The embodiment provides a metal and living body detection system, which comprises a detection coil D and a comb-shaped capacitor C2 connected in series. Figures 4-5As shown, the detection device includes a metal and a biological body detection device described in embodiment 1, and a plurality of detection coil arrays of the detection device are distributed in an array.

[0048] The system of the embodiment can be used in application scenarios where the detection area is much larger than the detection device, and multiple detection devices are combined for detection to meet the requirements of practical applications. Specifically, the array distribution structure is as shown in Figure 4

[0049] Further, a signal generator can be used, and the signal generator is connected to the detection part of each detection device through a relay. Each relay controls the detection part of one detection device. The detection part refers to the part of the detection device other than the signal generator, including the detection coil and the comb-shaped capacitor in series.

[0050] Figure 5 In the embodiment, relays 1, 2, …, n control n groups of detection devices. The output voltage of the detection circuit is isolated, filtered, amplified, and rectified, and is fed back to the single-chip microcomputer for comparison with the voltage before detection, so as to determine whether the metal and the biological body exist.

[0051] Embodiment 3

[0052] Based on embodiment 1 or embodiment 2, the embodiment provides a metal and biological body detection method, including the following steps:

[0053] Step 1, modulate the inductance-capacitance series resonance state of the detection device to obtain a first voltage signal U1 across the coil;

[0054] Step 2, obtain a second voltage signal U2 after the metal or biological body enters the detection area;

[0055] Step 3, calculate the difference between the second voltage signal U2 and the first voltage signal U1, and determine whether the metal or biological body exists in the detection area according to the difference between the two voltage signals and the set voltage difference threshold;

[0056] Step 4, when the result of the judgment is that the metal or biological body exists in the detection area, the inductance of the detection coil and the capacitance value of the comb-shaped capacitor are obtained. When the inductance of the detection coil D changes beyond the set range, it is determined that the foreign object is a metal. When the capacitance value of the comb-shaped capacitor C2 exceeds the set range, it is determined that the foreign object is a biological body.

[0057] Wherein, the change of inductance and capacitance can be measured by measuring voltage and current and calculating.

[0058] During the test, as shown in Figure 6 ​As shown, first, the detection circuit is modulated to the inductance-capacitance series resonance state, and the voltage across the coil is recorded. Then, the metal or organism is allowed to enter the detection area, and the resonance state is destroyed due to the magnetic effect and the like, and the voltage across the coil changes, and the changed voltage value is recorded. According to the change of the voltage, it can be judged that the metal or organism exists in the detection area, and then according to the actual situation of each application field, corresponding processing is made.

[0059] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

[0060] Although the specific embodiments of the present disclosure are described above in combination with the drawings, they are not intended to limit the protection scope of the present disclosure. Those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present disclosure without creative labor are still within the protection scope of the present disclosure.

Claims

1. A metal and biological body detection device, characterized in that: It includes a detection coil, a comb capacitor and a signal generator connected in series, wherein the detection coil and the comb capacitor are placed overlapping; the signal generator is used to provide an electrical signal of a set resonant frequency to the detection coil and the comb capacitor; It also includes a compensation capacitor and a compensation resistor, wherein the compensation capacitor is connected in series with the comb capacitor; the compensation resistor is connected in series with the comb capacitor; The comb capacitor is arranged above the detection coil; the detection coil adopts a double D coil structure, and two adjacent square coils are connected in anti-series; Alternatively, the comb capacitor includes two oppositely arranged comb capacitor plates, each comb capacitor plate includes a transverse electrode plate and a plurality of longitudinal electrode plates arranged on the transverse electrode plate and perpendicular to the transverse electrode plate, and each longitudinal electrode plate of the two opposite comb capacitor plates is sequentially arranged in pairs opposite to each other; The thickness of the comb-shaped capacitor plate is not greater than a set thickness, and the set thickness is less than 1 mm; The length of the horizontal plate of the comb capacitor is greater than the vertical plate; A first distance is set between two opposite longitudinal plates; Alternatively, adjacent longitudinal plates of the same comb-shaped capacitor plate are spaced apart by a set second distance; Alternatively, in the two comb-shaped capacitor plates of the comb-shaped capacitor, the distance between the longitudinal electrode plate of one comb-shaped capacitor plate and the transverse electrode plate of the other comb-shaped capacitor plate is a set third distance; It also includes a detection control unit, which includes a voltage signal detection unit, a signal processing unit and a single chip microcomputer connected in sequence; The signal detection unit is connected to the series circuit of the detection coil and the comb capacitor, and is used to collect the voltage signal of the series circuit; The signal preprocessing unit is used to preprocess the collected voltage signal; The single chip microcomputer is used to calculate the amount of voltage or current change based on the pre-processed voltage signal, and determine whether the detected object is metal or a biological object based on the voltage change range caused by metal and the voltage change range caused by biological objects.

2. A metal and biological body detection system, characterized by: The invention comprises a metal and biological body detection device as claimed in claim 1, wherein the detection coils of a plurality of detection devices are distributed in an array.

3. A metal and organism detection system as claimed in claim 2, characterized in that: Multiple detection devices use one signal generator, which is connected to a detection part of each detection device through a relay; the detection part includes a detection coil and a comb capacitor connected in series.

4. A method for detecting metals and organisms, based on the metal and organism detection device according to claim 1, characterized in that: The steps include: The detection device is modulated into a series resonant state of the inductor and capacitor to obtain a first voltage signal at both ends of the coil; Acquiring a second voltage signal after the metal or organism enters the detection area; Calculating the difference between the second voltage signal and the first voltage signal, and determining whether metal or biological matter exists in the detection area based on the difference between the two voltages; When the judgment result is that there is metal or a biological body in the detection area, the inductance of the detection coil and the capacitance value of the comb capacitor are obtained. When the change of the inductance of the detection coil exceeds the set range, the foreign body is determined to be metal; when the capacitance value of the comb capacitor exceeds the set range, the foreign body is determined to be a biological body.

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