Electronic target detection system

Abstract

The utility model discloses an electronic target detection system, belongs to the technical field of safety detection, and solves the problem that most dangerous goods types can be judged by combining a manual mode, but the situation of missed observation, especially control of metal products such as cutters, can occur at the end. Comprising an alarm. The metal sensor monitors the metal product and feeds back a metal signal; the voltage comparison circuit is coupled with the output end of the metal sensor, and the voltage comparison circuit feeds back a comparison signal after a corresponding metal signal is greater than a metal reference signal; the input end of the timing circuit is coupled with the output end of the voltage comparison circuit, and the timing circuit receives the comparison signal and outputs a timing signal for a certain time after continuously receiving the comparison signal; and a control circuit. Metal products are detected through the metal sensor, whether the metal products are controlled cutters or not is judged by detecting the duration of metal signals, the workload of security inspectors is reduced, and missing detection is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of safety detection, in particular to an electronic target detection system. Background Art

[0002] Controlled knives pose a serious threat to public security due to their potential dangers. Such knives are easy to conceal and carry, and are easy to commit violent crimes, increasing public safety risks. Illegal possession or use of controlled knives may cause personal injury or even fatal incidents, disrupt social order, and cause panic. Therefore, countries generally pass legislation to strictly restrict the circulation and use of controlled knives to reduce their negative impact on society and protect people's lives and property.

[0003] In the field of public safety, such as airport security and surveillance cameras, it is of great significance to improve the detection efficiency and accuracy of controlled knives. Through these methods, the behavior of carrying controlled knives can be effectively identified and warned, thereby enhancing social security management.

[0004] In addition, in transportation hubs, such as subway stations, railway stations, high-speed rail stations and other important locations, security inspection machines are usually installed to check luggage to determine whether there are dangerous goods in the security inspection machine. The current security inspection machines are all external monitors, and security inspectors manually observe the contents of the monitor to determine whether there are any problems. However, combined with manual methods, most types of dangerous goods can be identified, but there will eventually be omissions, especially for many metal products such as controlled knives. They can be judged through a more automated method to improve efficiency.

[0005] Therefore, an electronic target detection system is proposed to solve or alleviate the above problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes an electronic target detection system.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An electronic target detection system comprising

[0009] Alarm;

[0010] Metal sensors, which monitor metal products and feedback metal signals;

[0011] A voltage comparison circuit is coupled to the output terminal of the metal sensor, and the voltage comparison circuit feeds back a comparison signal when the corresponding metal signal is greater than the metal reference signal;

[0012] A timing circuit, wherein an input terminal of the timing circuit is coupled to an output terminal of the voltage comparison circuit, and the timing circuit receives a comparison signal and outputs a timing signal after a certain period of time after continuously receiving the comparison signal;

[0013] A control circuit, wherein the input end of the control circuit is coupled to the output end of the timing circuit, and the control circuit responds to the timing signal and controls the alarm to work.

[0014] Preferably, it also includes a signal amplification circuit;

[0015] The signal amplifying circuit is coupled between the metal sensor and the voltage comparing circuit, receives the metal signal, performs operational amplification, and outputs the amplified metal signal.

[0016] Preferably, it also includes a trigger circuit;

[0017] The trigger circuit is coupled between the control circuit and the alarm, and the trigger circuit is controlled by the control circuit to turn on and off the circuit where the alarm is located.

[0018] Preferably, the signal amplifying circuit comprises an LM741 operational amplifier and a plurality of resistors, and the output end of the metal sensor is coupled to the positive input end of the LM741 operational amplifier.

[0019] Preferably, the voltage comparison circuit includes an LM339 voltage comparator and a first transistor switch, the output end of the LM741 operational amplifier is coupled to the positive input end of the LM339 voltage comparator, the output end of the LM339 voltage comparator is coupled to the base of the first transistor switch, the collector of the first transistor switch is connected to power, and the emitter of the first transistor switch is coupled to the timing circuit and then grounded.

[0020] Preferably, the timing circuit is an RC delay circuit, which includes a switching diode, two resistors, a second triode switch, and a capacitor, wherein one of the resistors is connected in series with the capacitor and then grounded, one end of the resistor away from the capacitor is coupled to the emitter of the first triode switch, one end of the other resistor is coupled to the emitter of the first triode switch, and the resistor is connected in parallel with the previous resistor, the resistor is coupled to the base of the second triode switch, the switching diode is connected in parallel with the resistor, the base of the second triode switch is connected between the resistor and the capacitor, the emitter of the second triode switch is grounded, and the input end of the control circuit is connected between the emitter of the second triode switch and the ground.

[0021] Preferably, the control circuit comprises an stm32 single chip microcomputer.

[0022] Preferably, the trigger circuit includes a third triode switch, the base of the third triode switch is coupled to the output end of the control circuit, the collector of the third triode switch is electrically connected, and the emitter of the third triode switch is connected to the alarm and then grounded.

[0023] The utility model has the following beneficial effects:

[0024] The utility model detects metal products through metal sensors and determines whether they are controlled knives by detecting the duration of metal signals, thereby reducing the workload of security inspectors and avoiding missed inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural block diagram of the utility model;

[0027] Figure 2 It is the wiring diagram of the metal sensor and the signal amplifier in the utility model;

[0028] Figure 3 It is the wiring diagram of the voltage comparison circuit in the utility model;

[0029] Figure 4 It is the wiring diagram of the timing circuit in the utility model;

[0030] Figure 5 It is the wiring diagram of the trigger circuit and the alarm in the utility model.

[0031] 1. Metal sensor; 2. Signal amplifier; 3. Voltage comparison circuit; 4. Timing circuit; 5. Control circuit; 6. Trigger circuit; 7. Alarm. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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 noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0036] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] An electronic target detection system, such as Figure 1 As shown, it includes an alarm 7, a metal sensor 1, a voltage comparison circuit 3, a timing circuit 4, a control circuit 5, a signal amplifying circuit, and a trigger circuit 6.

[0039] The alarm 7 is used for alarming. The metal sensor 1 monitors the metal products and feeds back the metal signal. The voltage comparison circuit 3 is coupled to the output end of the metal sensor 1. The voltage comparison circuit 3 feeds back the comparison signal after the corresponding metal signal is greater than the metal reference signal therein. The input end of the timing circuit 4 is coupled to the output end of the voltage comparison circuit 3. The timing circuit 4 receives the comparison signal and outputs the timing signal after a certain period of time after continuously receiving the comparison signal. The input end of the control circuit 5 is coupled to the output end of the timing circuit 4. The control circuit 5 responds to the timing signal and controls the alarm 7 to work. The signal amplification circuit is coupled between the metal sensor 1 and the voltage comparison circuit 3. It receives the metal signal, performs operational amplification, and outputs the amplified metal signal. The trigger circuit 6 is coupled between the control circuit 5 and the alarm 7. The trigger circuit 6 is controlled by the control circuit 5 to turn on and off the power of the circuit where the alarm 7 is located.

[0040] like Figure 2 As shown, the signal amplifying circuit includes an LM741 operational amplifier and a plurality of resistors, and the output end of the metal sensor 1 is coupled to the positive input end of the LM741 operational amplifier.

[0041] like Figure 3 As shown, the voltage comparison circuit 3 includes an LM339 voltage comparator and a first transistor switch. The output end of the LM741 operational amplifier is coupled to the positive input end of the LM339 voltage comparator, the output end of the LM339 voltage comparator is coupled to the base of the first transistor switch, the collector of the first transistor switch is connected to electricity, and the emitter of the first transistor switch is coupled to the timing circuit 4 and then grounded.

[0042] like Figure 4 As shown, the timing circuit 4 is an RC delay circuit, which includes a switching diode, two resistors, a second triode switch, and a capacitor, wherein one resistor is connected in series with the capacitor and then grounded, one end of the resistor away from the capacitor is coupled to the emitter of the first triode switch, one end of the other resistor is coupled to the emitter of the first triode switch, and the resistor is connected in parallel with the previous resistor, the resistor is coupled to the base of the second triode switch, the switching diode is connected in parallel with the resistor, the base of the second triode switch is connected between the resistor and the capacitor, the emitter of the second triode switch is grounded, and the input end of the control circuit 5 is connected between the emitter of the second triode switch and the ground.

[0043] The control circuit 5 includes a stm32 microcontroller, such as Figure 5 As shown, the trigger circuit 6 includes a third triode switch, the base of the third triode switch is coupled to the output end of the control circuit 5, the collector of the third triode switch is connected to the power supply, and the emitter of the third triode switch is connected to the alarm 7 and then grounded.

[0044] When the utility model is actually working, the metal sensor 1 is used to detect the metal products passing by, and the metal signal is fed back. The metal signal is amplified by the signal amplification circuit, so that the amplified metal signal can convert the signal current into a signal voltage in the voltage comparison circuit 3 to compare with the reference voltage converted by the metal reference signal current, and after the signal voltage is greater than the reference voltage, the voltage comparison circuit 3 can output a comparison signal to the timing circuit 4, and the RC delay circuit of the timing circuit 4 continuously receives the comparison signal from the voltage comparison circuit 3, and then generates a current to charge the capacitor in the RC delay circuit. After the capacitor is charged, the capacitor starts to discharge, and then the second transistor switch is turned on, thereby providing an input for the control circuit 5. A timing signal is inputted into the input end. After receiving the timing signal, the control circuit 5 responds and outputs a control signal to the base of the third transistor switch, so that the collector and emitter of the third transistor switch are turned on, so that the alarm 7 is powered on and the alarm 7 starts to work. Since the controlled knives have a certain length, when metal products such as controlled knives pass through the metal sensor 1, the time for the metal sensor 1 to continuously output the metal signal must be greater than the time for ordinary metal products to pass through. Therefore, a certain time is set to determine whether it is a long metal product. If it meets the situation, it is a controlled knife or a controlled instrument. After the alarm, the security inspector intervenes, which can reduce the work intensity of the security inspector to a certain extent and avoid the situation of missing something.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electronic target detection system, characterized in that: include Alarm (7); A metal sensor (1) which monitors metal products and feeds back metal signals; A voltage comparison circuit (3) is coupled to the output end of the metal sensor (1), and the voltage comparison circuit (3) feeds back a comparison signal when the corresponding metal signal is greater than the metal reference signal therein; A timing circuit (4), wherein an input end of the timing circuit (4) is coupled to an output end of the voltage comparison circuit (3), and the timing circuit (4) receives a comparison signal and outputs a timing signal after a certain period of time after continuously receiving the comparison signal; A control circuit (5), wherein an input end of the control circuit (5) is coupled to an output end of the timing circuit (4), and the control circuit (5) responds to the timing signal and controls the alarm (7) to operate.

2. An electronic target detection system according to claim 1, characterized in that: Also includes a signal amplification circuit; The signal amplification circuit is coupled between the metal sensor (1) and the voltage comparison circuit (3), receives the metal signal, performs operational amplification and outputs the amplified metal signal.

3. An electronic target detection system according to claim 1, characterized in that: Also includes a trigger circuit (6); The trigger circuit (6) is coupled between the control circuit (5) and the alarm (7), and the trigger circuit (6) is controlled by the control circuit (5) to turn on and off the power of the circuit where the alarm (7) is located.

4. An electronic target detection system according to claim 2, characterized in that: The signal amplification circuit comprises an LM741 operational amplifier and a plurality of resistors, and the output end of the metal sensor (1) is coupled to the positive input end of the LM741 operational amplifier.

5. An electronic target detection system according to claim 4, characterized in that: The voltage comparison circuit (3) comprises an LM339 voltage comparator and a first transistor switch, the output end of the LM741 operational amplifier is coupled to the positive input end of the LM339 voltage comparator, the output end of the LM339 voltage comparator is coupled to the base of the first transistor switch, the collector of the first transistor switch is connected to electricity, and the emitter of the first transistor switch is coupled to the timing circuit (4) and then grounded.

6. An electronic target detection system according to claim 5, characterized in that: The timing circuit (4) is an RC delay circuit, which includes a switching diode, two resistors, a second triode switch, and a capacitor, wherein one of the resistors is connected in series with the capacitor and then grounded, one end of the resistor away from the capacitor is coupled to the emitter of the first triode switch, one end of the other resistor is coupled to the emitter of the first triode switch, and the resistor is connected in parallel with the previous resistor, the resistor is coupled to the base of the second triode switch, the switching diode is connected in parallel with the resistor, the base of the second triode switch is connected between the resistor and the capacitor, the emitter of the second triode switch is grounded, and the input end of the control circuit (5) is connected between the emitter of the second triode switch and the ground.

7. An electronic target detection system according to claim 1, characterized in that: The control circuit (5) comprises an STM32 single chip microcomputer.

8. An electronic target detection system according to claim 3, characterized in that: The trigger circuit (6) comprises a third triode switch, the base of the third triode switch is coupled to the output end of the control circuit (5), the collector of the third triode switch is electrically connected, and the emitter of the third triode switch is connected to the alarm (7) and then grounded.

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