Mobile terminal identification device and method and security check door

Abstract

The invention discloses a mobile terminal recognition device and method and a security door, and the device comprises a signal transmitting module, a signal receiving module, a signal processing module and a control module, and the control module is used for obtaining the metal amplitude, the magnetic amplitude and the phase included angle of a to-be-detected object. And judging whether the object to be detected is the mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio of the metal amplitude to the magnetic amplitude and the phase included angle. According to the technical scheme, by introducing multi-dimensional signal detection and analysis, the problems of false alarm and missing alarm in an existing mobile terminal detection technology are effectively solved, particularly, remarkable advantages are shown in a complex high-safety scene, and by accurately distinguishing the mobile terminal from other personal belongings, the detection accuracy of the mobile terminal is improved. According to the technical scheme, the detection effect of the security check door can be greatly improved, and the higher requirements for safety and information confidentiality in the modern society are met.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product detection, and in particular to a mobile terminal identification device, method and security door. Background Art

[0002] With the continuous development of social economy, the popularity of smart mobile terminals has increased rapidly, and the convenience brought by the use of mobile terminals has become an indispensable part of modern life. However, with the widespread use of mobile terminals, security issues have gradually emerged, especially in situations involving confidentiality and sensitive information. At present, mobile terminal leakage has become a new way of information leakage, bringing huge security risks. In order to effectively prevent this problem, the development of security gates that can specifically detect mobile terminals has become an important technical requirement. This type of security gate can effectively detect electronic devices including mobile phones, thereby improving security.

[0003] However, most security gates on the market currently use metal detection technology. As long as a metal object is detected, an alarm will be triggered, but it cannot distinguish the type of metal objects. Common personal belongings such as keys, belts, zippers, etc. will also trigger alarms, resulting in frequent false alarms. This type of traditional metal detection security gate is obviously not suitable for examination rooms, business confidentiality meetings and other places with extremely high security requirements and explicitly prohibiting the carrying of mobile terminals.

[0004] In addition, some current mobile terminal detection technologies also have many limitations. For example, some manufacturers use pseudo base station technology, which can only detect mobile terminals in the power-on state, but cannot detect devices in the power-off state because the devices cannot receive the signals sent by the pseudo base station at this time. Some manufacturers also use nonlinear node detection technology. Although it can detect items containing semiconductor components, this solution has a high false alarm rate and missed alarm rate. As more and more mobile terminals adopt metal shell designs, the semiconductor characteristics of the devices are shielded, further increasing the probability of missed alarms. Another solution is based on magnetic detection technology, but this method also has shortcomings, that is, it cannot effectively distinguish between mobile terminals and other common magnetic items (such as keys, belts, etc.). Therefore, the existing mobile terminal detection technology has limitations to varying degrees in practical applications and cannot fully meet the needs of high-security places. Summary of the invention

[0005] The embodiments of the present invention provide a mobile terminal identification device, method and security door to solve the above technical problems.

[0006] A first aspect of an embodiment of the present invention provides a mobile terminal identification device, including:

[0007] A signal transmitting module, used to generate an excitation magnetic field in a preset area;

[0008] A signal receiving module, used for outputting a sensing signal to be detected and a magnetic induction intensity signal when the object to be detected enters the preset area;

[0009] A signal processing module, used for processing the sensing signal to be measured to generate two detection signals with different phases;

[0010] A control module is used to obtain the metal amplitude of the object to be measured according to the induction signal to be measured, obtain the magnetic amplitude of the object to be measured according to the magnetic induction intensity signal, and obtain the phase angle of the object to be measured according to the two detection signals with different phases, and determine whether the object to be measured is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

[0011] A second aspect of an embodiment of the present invention provides a security door, comprising: the mobile terminal identification device described in Embodiment 1, an infrared detection module, a display module, an sound and light alarm module, a first door panel, a crossbeam and a second door panel, the crossbeam connecting the first door panel and the second door panel, the transmitting coil in the signal transmitting module, the receiving coil in the signal receiving module, the infrared detection module and the sound and light alarm module are respectively fixed on the first door panel or the second door panel, and the display module is fixed on the crossbeam.

[0012] A third aspect of an embodiment of the present invention provides a mobile terminal identification method, including:

[0013] Generate an excitation magnetic field in a preset area;

[0014] When the object to be detected enters the preset area, a detection induction signal and a magnetic induction intensity signal are generated, and the detection induction signal is processed to generate two detection signals with different phases;

[0015] The metal amplitude of the object to be measured is obtained according to the induction signal to be measured, the magnetic amplitude of the object to be measured is obtained according to the magnetic induction intensity signal, and the phase angle of the object to be measured is obtained according to the two detection signals with different phases, and it is judged whether the object to be measured is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

[0016] The technical effect of the embodiments of the present invention is as follows: the technical solution can effectively distinguish mobile terminals from other metal or magnetic objects through comprehensive analysis of metal amplitude, magnetic amplitude, ratio between metal amplitude and magnetic amplitude, and phase angle. This multi-dimensional signal analysis significantly improves the accuracy of recognition and reduces the false alarm rate. Compared with traditional metal detection or single signal detection, the technical solution effectively solves the problems of false alarm and missed alarm in existing mobile terminal detection technology by introducing multi-dimensional signal detection and analysis, and shows significant advantages in complex high-security scenarios. By accurately distinguishing mobile terminals from other personal belongings, the technical solution can greatly improve the detection effect of security doors and meet the higher demands for security and information confidentiality in modern society. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0018] Figure 1 is a structural diagram of a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0019] Figure 2 is a structural schematic diagram of a signal transmission module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0020] Figure 3 is a circuit diagram of a signal transmission module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0021] Figure 4 It is a partial structural diagram of a signal receiving module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0022] Figure 5 It is a partial circuit diagram of a signal receiving module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0023] Figure 6 It is another partial structural diagram of a signal receiving module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0024] Figure 7 A schematic diagram of the structure of a signal processing module in a mobile terminal identification device provided in a first embodiment of the present invention;

[0025] Figure 8A waveform diagram of a first reference signal and a second reference signal in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0026] Fig. 9 A schematic diagram of phase angle calculation in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0027] Fig.10 Another structural schematic diagram of a signal processing module in a mobile terminal identification device provided in Embodiment 1 of the present invention;

[0028] Fig.11 Another structural schematic diagram of a mobile terminal identification device provided by Embodiment 1 of the present invention;

[0029] Fig.12 A structural diagram of a security door provided by Embodiment 2 of the present invention;

[0030] Fig.13 A flowchart of a mobile terminal identification method provided by Embodiment 3 of the present invention;

[0031] Fig.14 A specific flow chart of step S103 in a mobile terminal identification method provided in Embodiment 3 of the present invention;

[0032] In the figure: 100, object to be measured; 101, signal transmitting module; 102, signal receiving module; 103, signal processing module; 104, control module; 111, switch module; 112, transformer; 113, transmitting coil; 121, receiving coil; 122, first amplifying module; 123, first analog-to-digital conversion module; 124, magnetic sensor; 125, second amplifying module; 126, second analog-to-digital conversion module; 131, first comparator; 132, first multiplier; 133, second comparator; 134, second multiplier; 135, third amplifying module; 136, third analog-to-digital conversion module; 137, fourth amplifying module; 138, fourth analog-to-digital conversion module; 201, first door panel; 202, second door panel; 203, crossbeam; 204, display module; 205, infrared detection module; 206, sound and light alarm module. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0035] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0036] Embodiment 1

[0037] This embodiment 1 provides a mobile terminal identification device, such as Figure 1 As shown, including:

[0038] The signal transmitting module 101 is used to generate an excitation magnetic field in a preset area;

[0039] The signal receiving module 102 is used to output a sensing signal and a magnetic induction intensity signal when the object to be detected 100 enters a preset area;

[0040] The signal processing module 103 is used to process the sensing signal to be measured and generate two detection signals with different phases;

[0041] The control module 104 is used to obtain the metal amplitude of the object to be tested 100 according to the induction signal to be tested, obtain the magnetic amplitude of the object to be tested 100 according to the magnetic induction intensity signal, and obtain the phase angle of the object to be tested 100 according to the two detection signals with different phases, and determine whether the object to be tested 100 is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

[0042] The signal transmitting module 101 is used to generate an excitation magnetic field in a preset area, and the excitation magnetic field interacts with the object to be tested 100 entering the area, so that the metal or magnetic material in the object to be tested 100 generates an induction signal. The signal transmitting module 101 usually includes one or more inductance coils, and the coils work by connecting to an AC power supply or a drive circuit. The drive circuit is usually controlled by a signal generator or oscillator to generate a stable AC signal. When the AC current flows in the coil, an excitation magnetic field is generated in the surrounding space.

[0043] Among them, the signal receiving module 102 outputs the induction signal to be measured and the magnetic induction intensity signal from the object to be measured 100. The induction signal to be measured reflects the metal properties of the object to be measured 100, and the magnetic induction intensity signal provides the magnetic information of the object. The signal receiving module 102 usually includes one or more induction coils. When the object to be measured 100 enters the preset area, the electromagnetic field in the induction coil changes. The induction coil converts the electromagnetic field change into an electrical signal, that is, an induction signal, through the principle of electromagnetic induction. The received induction signal is often weak, so it is necessary to amplify the signal through an amplifier circuit, and remove noise and interference through a filter to extract a clear induction signal to be measured. The signal receiving module 102 also includes a magnetic sensor (such as a Hall sensor or a magnetoresistive sensor) for detecting the magnetic field intensity in the preset area. When the object to be measured 100 enters the area, the magnetic properties of the object will change the local magnetic field distribution, and the magnetic sensor will respond to this change and generate an electrical signal related to the magnetic induction intensity. The electrical signal output by the magnetic sensor can be converted into a digital signal by an A / D converter for subsequent signal processing and analysis.

[0044] The signal processing module 103 processes the sensing signal to be measured output by the signal receiving module 102 and converts it into two detection signals with different phases, which usually includes phase shift signals, amplification, filtering and other operations to extract the phase characteristics of the object to be measured 100. By generating two detection signals with different phases, the metal and magnetic properties of the object to be measured 100 can be better analyzed and the phase angle thereof can be calculated.

[0045] Among them, the control module 104 calculates the metal amplitude, magnetic amplitude, and the ratio between the metal amplitude and the magnetic amplitude of the object to be tested 100 according to the information provided by the signal processing module 103, and obtains the phase angle of the object to be tested 100 by analyzing the two detection signals with different phases. Finally, the control module 104 will determine whether the object is a mobile terminal based on this information. The control module 104 obtains the sensing signal to be tested from the signal receiving module 102. The sensing signal to be tested usually reflects the coupling between the object to be tested 100 and the excitation magnetic field, which includes the response of the metal object to the excitation magnetic field. Through signal processing (such as taking absolute value, RMS value calculation, envelope detection, etc.), the amplitude information of the sensing signal to be tested is extracted. The amplitude represents the influence of the metal content or its conductivity of the object to be tested 100 on the signal, that is, the metal amplitude. The control module 104 obtains the magnetic induction intensity signal output from the signal receiving module 102. The magnetic induction intensity signal reflects the change in the magnetic field caused by the magnetic characteristics of the object to be tested 100 after it enters the preset area. Similar to the calculation of the metal amplitude, the amplitude of the magnetic induction intensity signal is extracted by signal processing technology. The amplitude reflects the magnetic properties of the object to be tested 100, such as the strength of ferromagnetism or anti-magnetism, that is, the magnetic amplitude. The control module 104 performs a division operation based on the metal amplitude and the magnetic amplitude to obtain the ratio between the metal amplitude and the magnetic amplitude. The control module 104 obtains two detection signals with different phases (such as signals with a phase difference of 90 degrees or other degrees) from the signal processing module 103. The control module 104 calculates the phase difference between the two signals, and usually uses the inverse tangent function to calculate the phase angle. The phase angle obtained by the above calculation reflects the electromagnetic response direction of the object to be tested 100 in the excitation magnetic field. The control module 104 combines the obtained metal amplitude, magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle, and uses the preset threshold and algorithm to comprehensively judge the characteristics of the object to be tested 100 to determine whether it is a mobile terminal. By comparing the metal amplitude, magnetic amplitude, ratio between the metal amplitude and magnetic amplitude, and phase angle of the object to be tested 100 with the characteristic values ​​of a known mobile terminal, when the above parameters are all within a preset range, it is determined to be a mobile terminal; when one parameter does not meet the condition, it is determined not to be a mobile terminal.

[0046] The technical effect of this embodiment is that: this technical solution uses a signal transmitting module to generate an excitation magnetic field, and obtains the induction signal to be measured and the magnetic induction intensity signal of the object to be measured through the signal receiving module, and processes the induction signal to be measured through the signal processing module to generate two detection signals with different phases. The control module obtains the key parameters such as the metal amplitude, magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle of the object to be measured according to these signals. By comprehensively analyzing these parameters, especially the ratio between the metal amplitude and the magnetic amplitude and the phase angle, the mobile terminal can be effectively distinguished from other metal or magnetic objects. This multi-dimensional signal analysis significantly improves the accuracy of recognition and reduces the false alarm rate. Compared with traditional metal detection or single signal detection, this technical solution can more accurately identify the characteristics of the mobile terminal and avoid the situation where common metal objects cause false alarms. At the same time, combined with the comprehensive judgment of multi-dimensional signals, the problem of underreporting caused by the design or state of the mobile terminal is reduced.

[0047] For the signal transmitting module 101, the signal transmitting module 101 may have a variety of structural designs, including but not limited to the following structural designs:

[0048] 1. Simple switch control structure: It includes a switch module, a transformer and a transmitting coil. The control module controls the on and off of the current through the switch module, and then generates a magnetic field through the transformer and the transmitting coil.

[0049] 2. Full-bridge or half-bridge drive structure: A full-bridge or half-bridge drive circuit is used to control the current direction of the transmitting coil. This structure usually includes multiple switching elements (such as MOSFET or IGBT) and uses a pulse width modulation (PWM) signal to accurately control the amplitude and frequency of the magnetic field.

[0050] 3. Resonant circuit structure: It contains an LC resonant circuit (inductor and capacitor), in which the transmitting coil is part of the inductor. The resonant circuit can oscillate naturally at a specific frequency to generate an efficient alternating magnetic field.

[0051] 4. Pulse excitation structure: Use a pulse generator to generate short but high-intensity current pulses to drive the transmitting coil to generate a transient strong magnetic field. The duration and interval of the pulse can be adjusted by the control module.

[0052] As an implementation of the signal transmission module 101, this implementation is only an example and does not limit the structure of the signal transmission module 101. Figure 2 As shown, the signal transmitting module 101 includes a switch module 111, a transformer 112 and a transmitting coil 113;

[0053] The switch module 111, the primary coil of the transformer 112 and the power supply voltage form a first series loop, and the secondary coil of the transformer 112 and the transmitting coil 113 form a second series loop;

[0054] The control module 104 controls the switch module 111 to enable the transmitting coil 113 to generate an excitation magnetic field in a preset area.

[0055] Among them, the main function of the switch module 111 is to control the on-off operation of the entire signal transmitting module 101, and play a role in controlling the current path. The transformer 112 is mainly responsible for voltage conversion in this circuit, converting the voltage generated by the primary coil into a voltage suitable for use by the transmitting coil 113. The main function of the transmitting coil 113 is to use the current of the secondary coil to generate an excitation magnetic field to cover the preset detection area. When the object 100 to be detected enters the area, its metal or magnetic properties will interact with this magnetic field to generate an induction signal. The control module 104 generates a square wave signal, which is used to drive the switch module 111. The square wave signal has a clear high level and low level cycle. By generating a square wave, the control module 104 can accurately control the on-off cycle of the switch module 111 at a preset frequency and duty cycle. When the square wave signal is at a high level, the switch module 111 is turned on and the first series circuit is turned on. When the square wave signal is at a low level, the first series circuit is turned off and the current path is cut off. As the switch module 111 is turned on and off, the primary coil of the transformer 112 generates an alternating current and induces a corresponding current in the secondary coil. The secondary coil is connected in parallel with the transmitting coil 113, and the generated current causes the transmitting coil 113 to generate an alternating excitation magnetic field. Since the control module 104 outputs a square wave signal, the excitation magnetic field generated by the transmitting coil 113 also presents periodic changes. This alternating magnetic field covers the preset detection area, and when the object 100 to be detected enters, its electromagnetic characteristics interact with the magnetic field to generate an induction signal and a magnetic induction intensity signal.

[0056] The technical effect of this embodiment is that the coordinated work of each module ensures that the signal transmission module can generate a stable and effective excitation magnetic field to cover the preset detection area. The control module ensures that the transmitting coil can continuously and stably generate the required magnetic field by controlling the operation of the switch module and combining the function of the transformer.

[0057] As an example of a signal transmitting module 101, Figure 3 As shown, the signal transmitting module 101 includes a switch tube Q1 , a resistor R1 , a diode D1 , a power source VCC, a capacitor C1 , an inductor L1 and a transformer T1 , and the gate of the switch tube Q1 is connected to the control module 104 .

[0058] The source of the switch tube Q1 is grounded, the drain of the switch tube Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the cathode of the diode D1, the anode of the diode D1 is connected to one end of the primary coil of the transformer T1, the other end of the primary coil of the transformer T1 is connected to the positive electrode of the power supply VCC, the negative electrode of the power supply VCC is grounded, one end of the secondary coil of the transformer T1 is respectively connected to one end of the capacitor C1 and one end of the inductor L1, and the other end of the secondary coil of the transformer T1, the other end of the capacitor C1 and the other end of the inductor L1 are connected to the ground.

[0059] Among them, the switch tube Q1 is used as the main control switch and is controlled by the driving signal output by the control module 104. The on and off of the switch tube Q1 determines the working state of the entire circuit. When the switch tube Q1 is turned on, the current flows from the power supply VCC through the primary coil of the transformer T1 to form a magnetic field; when the switch tube Q1 is turned off, the magnetic field decays rapidly and induces a voltage in the secondary coil. The switch tube Q1 generates an alternating magnetic field in the transformer T1 by controlling the flow and interruption of the current, thereby exciting the secondary coil to generate a high-frequency signal. The resistor R1 is mainly used to limit the current flowing through the switch tube Q1, avoid excessive current in the circuit, and protect the safety of the switch tube Q1 and other components. The main function of the diode D1 is to prevent reverse current, thereby protecting the switch tube Q1 from the impact of reverse voltage. The transformer T1 converts the alternating current on the primary coil into an induced voltage on the secondary coil through the coupling of its primary and secondary coils. The primary coil forms a loop with the switch tube Q1 and the power supply VCC for energy conversion; the secondary coil provides an excitation signal for the subsequent circuit through the generated induced voltage. Capacitor C1 and inductor L1 together form a resonant circuit for filtering and energy storage. Capacitor C1 can filter out unnecessary high-frequency noise and stabilize the resonant frequency. The function of inductor L1 is to generate a stable high-frequency signal through resonance with capacitor C1 to maintain the consistency of the excitation signal.

[0060] The technical effect of this circuit structure is that through the coordinated work of the above modules, the signal transmission module can effectively generate a stable excitation magnetic field that meets the design requirements, thereby providing a basis for subsequent signal detection and processing.

[0061] For the signal receiving module 102, as an implementation mode, Figure 4 As shown, the signal receiving module 102 includes a receiving coil 121, a first amplifying module 122 and a first analog-to-digital conversion module 123;

[0062] The output end of the receiving coil 121 is connected to the input end of the first amplifying module 122 to generate a sensing signal to be detected when the object to be detected 100 enters the preset area;

[0063] The output end of the first amplifying module 122 is respectively connected to the input end of the signal processing module 103 and the input end of the first analog-to-digital conversion module 123 to amplify the sensing signal to be measured;

[0064] The output end of the first analog-to-digital conversion module 123 is connected to the first input end of the control module 104 to perform analog-to-digital conversion on the amplified sensing signal to be measured.

[0065] Among them, the receiving coil 121 is used to sense the changes in the electromagnetic field in a preset area. When the object to be measured 100 (such as a mobile terminal) enters the area, the receiving coil 121 generates an induction signal related to the object. The first amplification module 122 is used to amplify the induction signal to be measured output by the receiving coil 121 to enhance the strength of the signal, thereby improving the accuracy and reliability of signal processing. The first analog-to-digital conversion module 123 is used to convert the amplified analog induction signal to be measured into a digital signal, so that the control module 104 can perform subsequent digital processing and analysis. The signal processing module 103 receives the amplified induction signal to be measured, and generates two detection signals with different phases according to the reference signal for further signal analysis.

[0066] As an example of the first amplification module 122, Figure 5 As shown, the first amplification module 122 includes a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier U1. One end of the capacitor C2 is respectively connected to one end of the receiving coil 121 and one end of the capacitor C3, the other end of the capacitor C2 is grounded, the other end of the capacitor C3 is respectively connected to one end of the resistor R4 and the non-inverting input end of the operational amplifier U1, the other end of the resistor R4 is grounded, the inverting input end of the operational amplifier U1 is respectively connected to one end of the resistor R2, one end of the resistor R3, and one end of the capacitor C4, the other end of the resistor R2 is connected to one end of the capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the resistor R3, the other end of the capacitor C4 and the output end of the operational amplifier U1 are commonly connected.

[0067] Among them, after the receiving coil 121 detects the object to be measured 100, an induction signal is generated, and the high-frequency noise is removed through the capacitor C2. After coupling through the capacitor C3, the induction signal is input into the feedback network of the amplifier (composed of resistors R2, R3, capacitors C4, C5) to adjust the gain and frequency response of the amplifier to ensure the accuracy and stability of the amplified signal. The operational amplifier U1 finally outputs the amplified signal, and after filtering and smoothing, the signal is passed to the next module for subsequent processing and analysis.

[0068] The technical effect of this circuit structure is that the first amplification module effectively enhances the amplitude of the sensing signal, while filtering out unnecessary noise and interference, ensuring the quality of the signal and providing a reliable basis for subsequent signal processing.

[0069] As another implementation of the signal receiving module 102, Figure 6 As shown, the signal receiving module 102 further includes a magnetic sensor 124, a second amplifying module 125 and a second analog-to-digital conversion module 126;

[0070] The output end of the magnetic sensor 124 is connected to the input end of the second amplification module 125 to generate a magnetic field strength signal when the object 100 to be detected enters the preset area;

[0071] The output end of the second amplification module 125 is connected to the input end of the second analog-to-digital conversion module 126 to amplify the magnetic field intensity signal;

[0072] The output terminal of the second analog-to-digital conversion module 126 is connected to the second input terminal of the control module 104 to perform analog-to-digital conversion on the amplified magnetic field intensity signal.

[0073] Among them, the magnetic sensor 124 is used to detect the magnetic field strength signal generated when the object to be tested 100 (such as a mobile terminal) enters a preset area. By capturing the magnetic field changes around the object, the magnetic sensor 124 can provide information about the magnetic characteristics of the object. The second amplification module 125 is used to amplify the magnetic field strength signal from the magnetic sensor 124. The amplified signal is clearer, making the subsequent signal processing more accurate and reliable, especially when the magnetic field strength signal is a weak signal, the amplification module can significantly improve the signal availability and detection accuracy. The second analog-to-digital conversion module 126 converts the amplified analog magnetic field strength signal into a digital signal for subsequent digital processing and analysis. The control module 104 receives the digital magnetic field strength signal from the second analog-to-digital conversion module 126, compares and analyzes it with other signals of the object to be tested 100 (such as metal amplitude), thereby judging the nature of the object to be tested 100, and further determining whether it is a mobile terminal.

[0074] The technical effect of this embodiment is that through the coordinated work of these modules, the signal receiving module can effectively obtain and process the magnetic field strength information of the object to be measured, and after combining with other signals, it can realize accurate identification of the mobile terminal.

[0075] As for the signal processing module 103, as an implementation mode, the signal processing module 103 receives a reference signal and a sensing signal to be measured, generates a first reference signal and a second reference signal according to the reference signal, generates a first detection signal according to the first reference signal and the sensing signal to be measured, and generates a second detection signal according to the second reference signal and the sensing signal to be measured, wherein the first reference signal and the second reference signal have the same waveform and different phases.

[0076] Among them, the reference signal is a known reference signal used for comparison with the sensing signal to be measured. The signal processing module 103 generates two different reference signals according to the reference signal: a first reference signal and a second reference signal. The two reference signals have the same waveform but different phases, that is, there is a fixed phase difference (for example, 90 degrees) in time. The signal processing module 103 mixes or multiplies the first reference signal with the sensing signal to be measured to generate a first detection signal. Due to the phase relationship between the first reference signal and the sensing signal to be measured, the first detection signal includes a component in the sensing signal to be measured that is related to the phase of the first reference signal. Similarly, the signal processing module 103 mixes or multiplies the second reference signal with the sensing signal to be measured to generate a second detection signal. Because the second reference signal has a different phase (for example, 90 degrees) compared with the first reference signal, the second detection signal includes a component in the sensing signal to be measured that is related to the phase of the second reference signal. By generating these two detection signals with different phases, the signal processing module 103 can effectively separate the information of the object to be measured 100 in two phase dimensions.

[0077] The technical effect of this embodiment is that by generating two detection signals with different phases, the signal processing module can more accurately capture and separate the response characteristics of the object to be tested at different phase angles. The two detection signals brought by the phase difference can provide more phase information about the object to be tested (such as a mobile terminal), which is convenient for judging the material, structure and whether the object is a mobile terminal. For example, a specific phase angle corresponds to certain specific physical characteristics, and only mobile terminals will show these characteristics. By processing the phase information, it is possible to distinguish whether the object to be tested is a mobile terminal, reduce false alarms and missed alarms, and improve the overall reliability and practicality of the system.

[0078] As an implementation of the signal processing module 103, Figure 7 As shown, the signal processing module 103 includes:

[0079] A first comparator 131, wherein a first input terminal and a second input terminal of the first comparator 131 receive a reference signal V0 and a first clock signal T1 respectively, so as to output a first reference signal V1;

[0080] A first multiplier 132, wherein a first input end of the first multiplier 132 is connected to an output end of the signal receiving module 102, and a second input end of the first multiplier 132 is connected to an output end of the first comparator 131, so as to generate a first detection signal V4 according to the first reference signal V1 and the sensing signal V3 to be detected;

[0081] A second comparator 133, wherein a first input terminal and a second input terminal of the second comparator 133 receive a reference signal V0 and a second clock signal T2 respectively, so as to output a second reference signal V2;

[0082] The second multiplier 134 has a first input connected to the output of the signal receiving module 102 and a second input connected to the output of the second comparator 133 to generate a second detection signal V5 according to the second reference signal V2 and the sensing signal V3 to be detected.

[0083] The first comparator 131 is used to compare the reference signal V0 and the first clock signal T1. By comparing the reference signal V0 and the first clock signal T1, the first comparator generates a first reference signal V1 with a fixed phase characteristic. The first multiplier 132 multiplies the sensing signal V3 to be detected output by the signal receiving module 102 with the first reference signal V1 to generate a first detection signal V4. By multiplying the sensing signal V3 to be detected with the first reference signal V1, the first multiplier 132 extracts a signal component related to the phase of the first reference signal V1. The second comparator is used to compare the reference signal V0 with the second clock signal T2, and the output is a second reference signal V2. By comparing the reference signal V0 and the second clock signal T2, the second comparator generates a second reference signal V2 with a different phase characteristic. The second multiplier 134 multiplies the sensing signal V3 to be detected with the second reference signal V2. By multiplying the sensing signal V3 to be detected with the second reference signal V2, the second multiplier 134 extracts a signal component related to the phase of the second reference signal V2.

[0084] The technical effect of this embodiment is that the first comparator and the second comparator generate reference signals with different phase characteristics, which can effectively perform phase analysis on the sensing signal to be measured, and the first detection signal and the second detection signal generated by the first multiplier and the second multiplier correspond to different phase characteristics, respectively, and information related to different phase reference signals can be extracted from the sensing signal to be measured. Through phase separation and signal multiplication operations, the features in the sensing signal to be measured can be extracted more accurately, and the detection capability and accuracy of the mobile terminal can be improved.

[0085] As an implementation method of the reference signal, Figure 8 As shown, the first reference signal and the second reference signal have the same waveform and a phase difference of 90 degrees.

[0086] The first reference signal and the second reference signal are generated by the same reference signal and different clock signals, but the two signals have the same frequency and waveform, except that the phase difference between the two is 90 degrees.

[0087] These reference signals are mixed with the sensing signal to be measured to generate a detection signal. Since there is a 90-degree phase difference between the first reference signal and the second reference signal, this phase difference causes the first detection signal and the second detection signal to contain information of the sensing signal to be measured in different phase directions. By using the phase relationship between the two detection signals, the phase angle of the sensing signal to be measured can be obtained according to the phase difference, for example, by using the inverse tangent function (arctan), such as Fig. 9 As shown, the phase angle ADC1 is the voltage value of the first detection signal, and ADC2 is the voltage value of the second detection signal.

[0088] The technical effect of this embodiment is that since the first reference signal and the second reference signal have a phase difference of 90 degrees, the phase information in the sensing signal to be measured can be effectively separated and detected, and the phase angle of the sensing signal to be measured can be accurately measured and analyzed.

[0089] Further, as another implementation of the signal processing module 103, Fig.10 As shown, the signal processing module 103 also includes:

[0090] An input end of the third amplifying module 135 is connected to an output end of the first multiplier 132 to amplify the first detection signal;

[0091] The input end of the third analog-to-digital conversion module 136 is connected to the output end of the third amplification module 135, and the output end of the third analog-to-digital conversion module 136 is connected to the control module 104 to perform analog-to-digital conversion on the amplified first detection signal;

[0092] An input end of the fourth amplification module 137 is connected to the output end of the second multiplier 134 to amplify the second detection signal;

[0093] An input end of the fourth analog-to-digital conversion module 138 is connected to an output end of the fourth amplification module 137 , and an output end of the fourth analog-to-digital conversion module 138 is connected to the control module 104 to perform analog-to-digital conversion on the amplified second detection signal.

[0094] Among them, the third amplification module 135 amplifies the first detection signal, the purpose of which is to enhance the amplitude of the detection signal so that the subsequent analog-to-digital conversion module can process the signal more accurately. The third analog-to-digital conversion module 136 performs analog-to-digital conversion on the amplified first detection signal, the purpose of which is to convert the analog signal into a digital signal for digital processing and analysis by the control module 104. The fourth amplification module 137 amplifies the second detection signal, and its function is similar to that of the third amplification module 135, that is, to enhance the amplitude of the second detection signal to ensure the accuracy of subsequent processing. The fourth analog-to-digital conversion module 138 performs analog-to-digital conversion on the amplified second detection signal, the purpose of which is to convert the analog signal of the second detection signal into a digital signal for processing by the control module 104.

[0095] The technical effect of this embodiment is that through amplification and analog-to-digital conversion, the signal processing module can ensure that the detection signal has sufficient amplitude and clarity before digital processing, thereby improving the accuracy of the signal, thereby making the final signal analysis and measurement results more reliable.

[0096] The first embodiment is described in detail below through the overall technical solution. Fig.11 As shown, it is a schematic diagram of the specific structure of the mobile terminal identification device provided in the first embodiment. The working process of the first embodiment is as follows:

[0097] The control module 104 outputs a square wave signal to the switch module 111, so that the transmitting coil 113 generates an excitation magnetic field in a preset area. When the object 100 to be detected enters the preset area, the receiving coil 121 generates a sensing signal V10 to be detected, the first amplifying module 122 amplifies the sensing signal V10 to be detected to obtain a sensing signal V3 to be detected, and outputs the sensing signal V3 to be detected to the signal processing module 103, the first analog-to-digital conversion module 123 performs analog-to-digital conversion on the sensing signal V3 to be detected to obtain a sensing signal V11 to be detected, and outputs the sensing signal V11 to the control module 104. The first comparator 131 compares the reference signal V0 and the first clock signal T1 to obtain a first reference signal V1, and the first multiplier 132 multiplies the sensing signal V3 to be detected output by the signal receiving module 102 by the first reference signal V1 to generate a first detection signal V4. The third amplifying module 135 amplifies the first detection signal V4 to obtain a first detection signal V6, and the first analog-to-digital conversion module 123 performs analog-to-digital conversion on the first detection signal V6 to obtain a first detection signal V7. The second comparator compares the reference signal V0 with the second clock signal T2 and outputs a second reference signal V2. The second multiplier 134 multiplies the sensing signal V3 to be measured by the second reference signal V2 to generate a second detection signal V5, the fourth amplifying module 137 amplifies the second detection signal V5 to obtain a second detection signal V8, and the second analog-to-digital conversion module 126 performs analog-to-digital conversion on the second detection signal V8 to obtain a second detection signal V9. The waveforms of the first reference signal V1 and the second reference signal V2 are the same, and the phase difference is 90 degrees. The magnetic sensor 124 generates a magnetic field strength signal V12 when the object to be measured 100 enters the preset area; the second amplification module 125 amplifies the magnetic field strength signal V12 to obtain a magnetic field strength signal V13; the second analog-to-digital conversion module 126 performs analog-to-digital conversion on the magnetic field strength signal V13 to obtain a magnetic field strength signal V14 and outputs it to the control module 104.

[0098] The control module 104 processes the sensing signal V11 to be tested, extracts the amplitude information of the sensing signal V11 to be tested, and obtains the metal amplitude. The control module 104 processes the magnetic field strength signal V14 to obtain the magnetic amplitude. The control module 104 performs a division operation based on the metal amplitude and the magnetic amplitude to obtain the ratio between the metal amplitude and the magnetic amplitude. The control module 104 uses the inverse tangent function to calculate the phase angle for the first detection signal V7 and the second detection signal V9. The control module 104 determines whether the metal amplitude is within the preset range. If not, it is determined that the object to be tested 100 is not a mobile terminal. If yes, it continues to determine whether the magnetic amplitude is within the preset range. If not, it is determined that the object to be tested 100 is not a mobile terminal. If yes, it continues to determine whether the ratio between the metal amplitude and the magnetic amplitude is within the preset range. If not, it is determined that the object to be tested 100 is not a mobile terminal. If yes, it continues to determine whether the phase angle is within the preset range. If yes, it is determined that the object to be tested 100 is a mobile terminal. If no, it is determined that the object to be tested 100 is not a mobile terminal.

[0099] Embodiment 2

[0100] This embodiment 2 provides a security door, such as Fig.12 As shown, it includes: the mobile terminal identification device of embodiment one, an infrared detection module 205, a display module 204, an sound and light alarm module 206, a first door panel 201, a beam 203 and a second door panel 202, the beam 203 connects the first door panel 201 and the second door panel 202, the transmitting coil 113 in the signal transmitting module 101, the receiving coil 121 in the signal receiving module 102, the infrared detection module 205 and the sound and light alarm module 206 are respectively fixed on the first door panel 201 or the second door panel 202, and the display module 204 is fixed on the beam 203.

[0101] Among them, the infrared detection module 205 is used to detect the movement and position of a person when passing through the security gate. The module can sense temperature changes or reflection signals through infrared sensors to determine whether a person has passed and their approximate location. The infrared detection module can quickly and contactlessly detect the presence and movement of a person, thereby triggering the control module 104 to work. The display module 204 is used to set relevant alarm parameters, display real-time detection results, and display information and results detected during the security inspection process, such as whether a person carries prohibited items, mobile terminal recognition results, alarm status, etc. The display module 204 usually includes a screen that can intuitively feedback detection information to security personnel. The sound and light alarm module 206 is used to emit sound and light signals when abnormal or prohibited items are detected to alert security personnel. This module is usually linked with other detection modules, especially mobile terminal recognition devices and infrared detection modules. The first door panel 201 and the second door panel 202 serve as the structural support part of the security door, and are used to install and fix other functional modules, including the transmitting coil 113 in the signal transmitting module 101, the receiving coil 121 in the signal receiving module 102, the infrared detection module 205, and the sound and light alarm module 206. The crossbeam 203 connects and supports the first door panel 201 and the second door panel 202, and is also used to install key components such as the display module 204, which plays a role in stabilizing the entire security door frame in terms of structure. The transmitting coil 113 and the receiving coil 121 are respectively installed on the first door 201 or the second door panel 202, and are used to generate and receive electromagnetic signals, and detect mobile terminal devices passing through the security door through these signals. The transmitting coil 113 generates an electromagnetic field of a specific frequency, and the receiving coil 121 is used to receive electromagnetic signals after being affected by the mobile terminal device.

[0102] The technical effect of the second embodiment is that through the coordinated work of the above modules, the security door can realize efficient and accurate mobile terminal recognition and personnel detection, and timely feedback the detection results through the sound and light alarm module and the display module. The overall design ensures the smoothness and reliability of the security inspection process, which helps to improve the efficiency and safety of security inspections.

[0103] Embodiment 3

[0104] This embodiment 3 provides a mobile terminal identification method, such as Fig.13 As shown, including:

[0105] Step S101: Generate an excitation magnetic field in a preset area.

[0106] Step S102: When the object to be detected enters the preset area, a detection induction signal and a magnetic induction intensity signal are generated, and the detection induction signal is processed to generate two detection signals with different phases.

[0107] Step S103. Obtain the metal amplitude of the object to be measured according to the induction signal to be measured, obtain the magnetic amplitude of the object to be measured according to the magnetic induction intensity signal, and obtain the phase angle of the object to be measured according to the two detection signals with different phases, and determine whether the object to be measured is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

[0108] Among them, in step S101, a stable excitation magnetic field is generated by a signal transmission module in a preset detection area, and the magnetic field can be continuous or pulsed. The generation of the excitation magnetic field is the basis of the recognition process. This magnetic field can stimulate the electromagnetic response inside the object to be detected, providing conditions for subsequent signal detection and processing.

[0109] Among them, in step S102, after the object to be tested enters the preset area, under the action of the excitation magnetic field, the metal and magnetic materials inside the object will generate an induced current, and then generate corresponding induction signals to be tested and magnetic induction intensity signals, which respectively reflect the different electromagnetic characteristics of the object to be tested. The induction signals to be tested are processed, usually including the steps of phase shifting, amplification, filtering and mixing, and finally two detection signals with different phases are generated. The detection signals with different phases are obtained by performing phase difference analysis between the induction signals to be tested and the reference signal. The generation of two detection signals with different phases can help the system analyze the phase characteristics of the object to be tested, especially the phase response differences of different materials in the electromagnetic field. This phase information provides feature information of different dimensions in subsequent object recognition, enhancing the accuracy of recognition.

[0110] Among them, in step S103, based on the induction signal to be measured, the metal amplitude of the object to be measured is calculated by a specific algorithm or detection circuit, and the metal amplitude represents the response intensity of the metal material inside the object under the action of the excitation magnetic field. By analyzing and calculating the magnetic induction intensity signal, the magnetic amplitude of the object to be measured is obtained, and the magnetic amplitude represents the response intensity of the magnetic material in the object to the external magnetic field. By comparing the two detection signals with different phases, the phase angle of the object to be measured is calculated, and the phase angle reflects the phase response characteristics of the object to the electromagnetic field. The phase angle can further distinguish the electromagnetic response characteristics of different materials, such as distinguishing between metal objects and non-metallic objects, magnetic objects and non-magnetic objects. This feature provides additional basis for judgment when finally identifying whether the object is a mobile terminal. By comprehensively analyzing the metal amplitude, magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle obtained previously, the nature of the object to be measured is judged. If these characteristic values ​​meet the preset mobile terminal characteristic mode, the object can be judged to be a mobile terminal.

[0111] Among them, Fig.14As shown, judging whether the object to be detected is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle includes:

[0112] Step S131, determine whether the metal amplitude is within a first preset range, if yes, execute step S132, if not, execute step S136.

[0113] Step S132, determining whether the magnetic amplitude is within a second preset range, if yes, executing step S133, if not, executing step S136.

[0114] Step S133, determining whether the ratio between the metal amplitude and the magnetic amplitude belongs to a third preset range, if yes, executing step S134, if not, executing step S136.

[0115] Step S134, determining whether the phase angle belongs to a fourth preset range, if yes, executing step S135, if no, executing step S136.

[0116] Step S135, determining whether the object to be detected is a mobile terminal.

[0117] Step S136, determining that the object to be detected is not a mobile terminal.

[0118] The technical effect of the third embodiment is that through multi-dimensional feature analysis (including metal characteristics, magnetic characteristics, phase characteristics, etc.), high-accuracy mobile terminal recognition can be achieved. This recognition method can effectively reduce misjudgments, improve the efficiency and reliability of security inspections, and adapt to different types of mobile terminal devices, and has broad application prospects.

[0119] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A mobile terminal identification device, characterized in that: include: A signal transmitting module, used to generate an excitation magnetic field in a preset area; A signal receiving module, used for outputting a sensing signal to be detected and a magnetic induction intensity signal when the object to be detected enters the preset area; A signal processing module, used for processing the sensing signal to be measured to generate two detection signals with different phases; A control module is used to obtain the metal amplitude of the object to be measured according to the induction signal to be measured, obtain the magnetic amplitude of the object to be measured according to the magnetic induction intensity signal, and obtain the phase angle of the object to be measured according to the two detection signals with different phases, and determine whether the object to be measured is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

2. The mobile terminal identification device according to claim 1, characterized in that: The signal transmitting module includes a switch module, a transformer and a transmitting coil; The switch module, the primary coil of the transformer and the power supply voltage form a first series loop, and the secondary coil of the transformer and the transmitting coil form a second series loop; The control module controls the switch module to enable the transmitting coil to generate an excitation magnetic field in a preset area.

3. The mobile terminal identification device according to claim 1, characterized in that: The signal receiving module includes a receiving coil, a first amplifying module and a first analog-to-digital conversion module; The output end of the receiving coil is connected to the input end of the first amplifying module to generate a sensing signal to be detected when the object to be detected enters the preset area; The output end of the first amplifying module is respectively connected to the input end of the signal processing module and the input end of the first analog-to-digital conversion module to amplify the sensing signal to be measured; The output end of the first analog-to-digital conversion module is connected to the first input end of the control module to perform analog-to-digital conversion on the amplified sensing signal to be measured.

4. The mobile terminal identification device according to claim 1, characterized in that: The signal receiving module also includes a magnetic sensor, a second amplification module and a second analog-to-digital conversion module; The output end of the magnetic sensor is connected to the input end of the second amplification module to generate a magnetic field strength signal when the object to be detected enters the preset area; The output end of the second amplification module is connected to the input end of the second analog-to-digital conversion module to amplify the magnetic field intensity signal; The output end of the second analog-to-digital conversion module is connected to the second input end of the control module to perform analog-to-digital conversion on the amplified magnetic field intensity signal.

5. The mobile terminal identification device according to claim 1, characterized in that: The signal processing module receives a reference signal and the sensing signal to be measured, generates a first reference signal and a second reference signal according to the reference signal, generates a first detection signal according to the first reference signal and the sensing signal to be measured, and generates a second detection signal according to the second reference signal and the sensing signal to be measured, wherein the first reference signal and the second reference signal have the same waveform and different phases.

6. The mobile terminal identification device according to claim 5, characterized in that: The first reference signal and the second reference signal have the same waveform and a phase difference of 90 degrees.

7. The mobile terminal identification device according to claim 5, characterized in that: The signal processing module comprises: A first comparator, wherein a first input terminal and a second input terminal of the first comparator receive a reference signal and a first clock signal respectively to output a first reference signal; a first multiplier, wherein a first input end of the first multiplier is connected to an output end of the signal receiving module, and a second input end of the first multiplier is connected to an output end of the first comparator, so as to generate a first detection signal according to the first reference signal and the sensing signal to be detected; a second comparator, wherein a first input terminal and a second input terminal of the second comparator receive a reference signal and a second clock signal respectively to output a second reference signal; A second multiplier, wherein a first input terminal of the second multiplier is connected to an output terminal of the signal receiving module, and a second input terminal of the second multiplier is connected to an output terminal of the second comparator, so as to generate a second detection signal according to the second reference signal and the sensing signal to be detected.

8. The mobile terminal identification device according to claim 7, characterized in that: The signal processing module also includes: An input end of the third amplifying module is connected to an output end of the first multiplier to amplify the first detection signal; The input end of the third analog-to-digital conversion module is connected to the output end of the third amplification module, and the output end of the third analog-to-digital conversion module is connected to the control module to perform analog-to-digital conversion on the amplified first detection signal; An input end of the fourth amplifying module is connected to an output end of the second multiplier to amplify the second detection signal; The input end of the fourth analog-to-digital conversion module is connected to the output end of the fourth amplification module, and the output end of the fourth analog-to-digital conversion module is connected to the control module to perform analog-to-digital conversion on the amplified second detection signal.

9. A security door, characterized in that: include: The mobile terminal identification device, infrared detection module, display module, sound and light alarm module, first door panel, crossbeam and second door panel as described in any one of claims 1 to 8, the crossbeam connecting the first door panel and the second door panel, the transmitting coil in the signal transmitting module, the receiving coil in the signal receiving module, the infrared detection module and the sound and light alarm module are respectively fixed on the first door panel or the second door panel, and the display module is fixed on the crossbeam.

10. A mobile terminal identification method, characterized in that: include: Generate an excitation magnetic field in a preset area; When the object to be detected enters the preset area, a detection induction signal and a magnetic induction intensity signal are generated, and the detection induction signal is processed to generate two detection signals with different phases; The metal amplitude of the object to be measured is obtained according to the induction signal to be measured, the magnetic amplitude of the object to be measured is obtained according to the magnetic induction intensity signal, and the phase angle of the object to be measured is obtained according to the two detection signals with different phases, and it is judged whether the object to be measured is a mobile terminal according to the metal amplitude, the magnetic amplitude, the ratio between the metal amplitude and the magnetic amplitude, and the phase angle.

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