CN113138423A - Metal detection method and device - Google Patents
Metal detection method and device Download PDFInfo
- Publication number
- CN113138423A CN113138423A CN202110270548.8A CN202110270548A CN113138423A CN 113138423 A CN113138423 A CN 113138423A CN 202110270548 A CN202110270548 A CN 202110270548A CN 113138423 A CN113138423 A CN 113138423A
- Authority
- CN
- China
- Prior art keywords
- detection
- phase
- door frame
- amplitude
- contraband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention provides a metal detection method and a device, wherein a coil sensor is adopted for signal detection, the coil sensor can not be influenced by a geomagnetic field and a magnetic field in the environment, and can detect slight magnetic field change, and the detection precision of a detection door can be effectively improved by arranging the coil sensor on a detection door frame. In addition, the invention utilizes the phase and amplitude of the signal detected by the coil sensor to correspondingly compare the collected phase and amplitude information of the coil with the set phase and amplitude generated when the contraband passes through the detection door frame, thereby more accurately determining whether the specified contraband enters the detection door frame and further judging whether the contraband exists, and further improving the identification accuracy. Therefore, the invention not only can improve the detection precision, but also can improve the identification accuracy.
Description
Technical Field
The invention relates to the technical field of article detection, in particular to a metal detection method and device.
Background
With the wide popularization of multimedia devices, people can easily use the multimedia devices to carry out conversation, recording, photographing, video shooting and the like, and the multimedia devices with the recording and photographing functions bring certain risks of information leakage while improving the life convenience of people. In an important place or a secret environment, carrying or using multimedia equipment such as a mobile phone, a recording pen, a camera and the like can cause secret information in the place to be leaked. In order to effectively reduce information leakage caused by the multimedia equipment in the secret-related place, the multimedia equipment needs to be effectively detected outside the secret-related place, and the multimedia equipment is physically isolated from entering the secret-related place so as to avoid secret leakage caused by the multimedia equipment.
Prior art 2 discloses a cell-phone signal detection device, including base, stand, shelves pole, pivot, motor, the top of base is provided with the stand, the place ahead of stand is provided with the shelves pole, be provided with on the shelves pole the pivot, the rear of pivot is provided with the motor, the top of stand is provided with the alarm lamp, top one side of stand is provided with the connection horizontal pole, one side of shelves pole is provided with the control box casing, the inside top of control box casing is provided with image recognizer.
The prior art 3 discloses a device for improving the sensitivity and the anti-interference capability of an electromagnetic detection security door, which comprises a magnetic guide arm, an electromagnetic excitation coil, a plurality of electromagnetic receiving sensors and an electromagnetic detector, wherein the end surfaces of two arms of the magnetic guide arm are opposite, a detection channel of the security door is arranged between the end surfaces of the two arms, and the magnetic guide arm is used for restraining a magnetic field so that the magnetic field is not diffused outwards, so that the anti-interference capability is improved; the electromagnetic exciting coil is fixed on the magnetic guide arm; the plurality of electromagnetic receiving sensors are distributed and fixed on the end surfaces of the two arms of the magnetic guide arm; the electromagnetic exciting coil and the plurality of electromagnetic receiving sensors are electrically connected with the electromagnetic detector.
In the prior art 1, only the signal is restored, and actually, the metal detection gate cannot distinguish the difference between the mobile phone (such as a recording pen and the like which contain a circuit board) and other metals, and the false alarm rate is still high. The prior art 2 is easily interfered by the surrounding environment, can only detect the mobile phone with the sim card, and can not detect a recording pen, the mobile phone without the sim card and other secret stealing devices. The magnetic detection in the prior art 3 can not solve the problems of false alarm and false alarm, is easily interfered by a geomagnetic field and a surrounding magnetic field, and has higher requirement on the stability of the surrounding magnetic field during detection.
Disclosure of Invention
The invention provides a metal detection method and a metal detection device, which are used for solving the defects that different electronic equipment cannot be distinguished and detection is incomplete due to narrow detection object range in the prior art and realizing safe, comprehensive and high-precision detection.
In a first aspect, the invention provides a metal detection method, which is implemented based on a detection doorframe on which a coil sensor is arranged; the metal detection method comprises the following steps:
acquiring the phase and amplitude of a signal detected by the coil sensor; and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
According to the present invention, there is provided a metal detection method, wherein determining whether a specific contraband enters a detection door frame according to a matching condition between a phase and an amplitude of a signal detected by a coil sensor and a phase and an amplitude of a detection signal generated when the specific contraband passes through the detection door frame, the method comprises:
predetermining the phase and amplitude of a detection signal generated when a specified contraband passes through the detection door frame; and comparing the phase and amplitude of the signal detected by the coil sensor with the phase and amplitude of a detection signal generated when the specified contraband passes through the detection door frame, and if the comparison result meets a preset condition, determining that the specified contraband enters the detection door frame.
According to the present invention, there is provided a metal detection method, wherein the specifying contraband includes: aluminum-shell mobile phones, ironware and electronic equipment containing circuit boards;
correspondingly, the phase and amplitude of the signal detected by the coil sensor are compared with the phase and amplitude of the detection signal generated when the specified contraband passes through the detection door frame, and if the comparison result meets the preset condition, the specified contraband is determined to enter the detection door frame, including:
acquiring an initial phase change value when a detected person enters a detection door frame, acquiring a process phase value or a process amplitude value of the detected person in the process of passing through the detection door frame if the initial phase change value is judged and acquired to be larger than zero, and determining that the detected person carries an aluminum-shell mobile phone if the process phase value is judged and acquired to be smaller than zero or the process amplitude value is determined to be smaller than zero;
if the initial phase change value is judged to be less than zero, acquiring a process phase value of the detected person in the process of passing through the detection door frame, and if the process phase value is judged to be always less than zero, determining that the detected person carries ironware;
and if the process phase value is judged and known to be larger than zero, determining that the detected person carries the electronic equipment with the circuit board.
The invention provides a metal detection method, wherein an infrared transmitter is also arranged on the detection door frame which is oppositely arranged; the infrared transmitter is used for detecting the time when a human body enters the door body and leaves the door body; when the infrared transmitter detects that a human body enters the door body, the coil sensor is triggered to start detection; and when the infrared transmitter detects that a human body leaves the door body, the coil sensor is triggered to stop detecting.
According to the present invention, there is provided a metal detection method, further comprising:
and when the specified contraband is determined to enter the detection door frame, carrying out sound-light alarm prompt.
The invention provides a metal detection method, wherein an image acquisition device and a display are connected to a door frame; and when the specified contraband is determined to enter the detection door frame, the image acquisition device acquires images and displays the acquired images on the display.
The invention provides a metal detection method, wherein a plurality of coil sensors are uniformly arranged on a door frame which is oppositely arranged from top to bottom; accordingly, the phase and amplitude of the signal detected by the coil sensor are acquired.
In a second aspect, the invention provides a metal detection device, which is implemented based on a detection door frame, wherein a coil sensor is arranged on the detection door frame; the metal detection device includes:
the acquisition module is used for acquiring the phase and amplitude of the signal detected by the coil sensor;
and the judging module is used for determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
In a third aspect, the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, for performing the steps of the metal detection method.
In a fourth aspect, the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program for executing the steps of the above-described metal detection method.
The invention adopts the coil sensor to detect signals, and can effectively improve the detection precision of the detection door by arranging the coil sensor on the detection door frame because the coil sensor can not be influenced by the geomagnetic field and the magnetic field in the environment and can detect slight magnetic field change at the same time. In addition, the invention utilizes the phase and amplitude of the signal detected by the coil sensor to correspondingly compare the collected phase and amplitude information of the coil with the set phase and amplitude generated when the contraband passes through the detection door frame, thereby more accurately determining whether the specified contraband enters the detection door frame and further judging whether the contraband exists, and further improving the identification accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a metal detection method provided by the present invention;
FIG. 2 is a schematic structural diagram of a detection doorframe provided by the present invention;
FIG. 3 is a schematic structural view of a detection doorframe with a beam according to the present invention;
FIG. 4 is a schematic flow diagram of the security detection provided by the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided in the present invention.
Reference numerals:
1: detecting a doorframe; 2: a coil sensor; 3: an infrared transmitter;
4: controlling an industrial personal computer; 5: a first door body; 6: a second door body;
7: a cross beam; 8: an image acquisition device;
9: a display.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, in an embodiment of the present invention, the present invention provides a metal detection method based on a detection doorframe 1, wherein the metal detection method is implemented based on the detection doorframe 1, and a coil sensor 2 is arranged on the detection doorframe 1; the metal detection method comprises the following steps:
s101: acquiring the phase and amplitude of a signal detected by the coil sensor 2;
s102: and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor 2 and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
In the present embodiment, the coil sensor 2 is an inductance sensor, and is a sensor configured by an iron core and a coil, which converts a change in linear or angular displacement into a change in coil inductance. The number of turns of the coil and the magnetic permeability of the material of the sensor are both constant, and the change of the inductance of the sensor is caused by the change of the geometric dimension of the magnetic circuit of the coil caused by the displacement input quantity. When the coil is connected to the measuring circuit and the excitation power source is switched on, a voltage or current output proportional to the displacement input can be obtained.
The coil sensor 2 is arranged on the detection door frame 1 of the detection door, and when a detected user passes through the detection door, the coil sensor 2 can generate different signal changes according to the difference of articles carried by the detected user. Because the embodiment mainly aims at metal detection, and the metal can be divided into paramagnetic substances and diamagnetic substances. The paramagnetic substance strengthens the magnetic field of the coil sensor 2, so that the phase of the voltage of the coil sensor 2 is advanced, and the amplitude change of the voltage of the coil sensor 2 is greater than 0 because the magnetic field is strengthened. The same is true. The opposite diamagnetic substance causes the phase of the voltage of the coil sensor 2 to lag and the amplitude of the voltage to decrease. Therefore, the coil sensor can accurately detect the specified type of article. The coil sensor 2 in this embodiment is obviously different from the electromagnetic receiving sensor in the background art, firstly, the electromagnetic receiving sensor mainly uses the hall effect to perform detection, wherein there are many false alarm situations when the hall element performs detection, and meanwhile, the electromagnetic receiving sensor is influenced by the geomagnetic field and has requirements on the setting direction of the detection door using the hall element, and secondly, the electromagnetic receiving sensor in the background art is easily influenced by the magnetic field in the environment, which may cause a phenomenon of inaccurate detection, and the coil sensor 2 in this embodiment is not influenced by the magnetic field and the environment, and has higher precision.
It can be understood that the coil sensor 2 has high sensitivity, and can effectively detect fine phase change, thereby realizing detection of smaller monitoring equipment, ensuring detection effect and improving security. The coil sensor is obviously different from the electromagnetic receiving sensor in the background technology, the electromagnetic receiving sensor is mainly used for detecting by utilizing the Hall effect, a plurality of false alarm situations exist in the Hall element during detection, meanwhile, the electromagnetic receiving sensor is influenced by the geomagnetic field and has requirements on the setting direction of a detection door utilizing the Hall element, and secondly, the electromagnetic receiving sensor in the background technology is easily influenced by the magnetic field in the environment, so that the phenomenon of inaccurate detection can be caused. The coil sensor is not influenced by the magnetic field and the environment, and has high precision.
In this embodiment, the detection doorframe 1 includes a first door body 5 and a second door body 6 which are oppositely disposed, and the distance between the first door body 5 and the second door body is enough to allow a detected person to pass through, and at the same time, the distance is not so far as to affect the measurement effectiveness of the coil sensor 2. In addition, the number of the coil sensors 2 is not limited in this embodiment, and may be more than one, and the coil sensors are arranged on the first door body 5 or the second door body 6, or a certain number of the coil sensors 2 are respectively arranged on the first door body 5 and the second door body 6, or the coil sensors 2 are arranged on the first door body 5 and the second door body 6 in a form corresponding to each other, and in this embodiment, the specific arrangement mode of the coil sensors 2 is not limited, so that the detected person can be detected.
The industrial control computer 4 can be various computers with data receiving capability and processing capability, and detects whether contraband exists and between which pair of coil sensors 2 the contraband is located by comprehensively analyzing the received data of all the sensors. And collecting signals before and after change according to the change rule of the phase and the amplitude, and calculating the phase and the amplitude to obtain a final detection result. The pre-change signal refers to the phase and amplitude values of the coil sensor 2 obtained by the industrial computer when no person passes through the coil sensor. The changed signal refers to the corresponding values of the phase and the amplitude in the coil sensor 2, which are obtained by the industrial control computer when the detected person passes through the detection door frame 1.
The step S101 of obtaining the phase and amplitude of the signal detected by the coil sensor 2 means that when the detected person passes through the detection doorframe 1, the coil sensor 2 can generate a cancelling or strengthening effect on the magnetic field of the coil sensor 2 due to the paramagnetic or diamagnetic effect of the detected metal, so as to affect the magnetic field of the coil sensor 2, and further affect the phase and magnitude of the voltage and current in the coil, and therefore, what material the material in the magnetic field is can be determined by measuring the phase and amplitude of the detected signal.
Step S102 is to cause different magnetic field changes in the coil sensor 2 according to different detected objects in step S101, so that the contraband to be detected can be tested, and the phase and amplitude of the coil sensor 2 when different contraband pass through the detection doorframe 1 can be obtained, thereby forming corresponding data. When a detected person passes through the detection door frame 1, the detected person can judge whether the object is contraband or not by acquiring the phase and amplitude of the voltage in the coil sensor 2 at the moment and comparing the acquired phase and amplitude with the measured phase and amplitude data of the contraband passing through the coil sensor 2.
This embodiment adopts coil sensor to carry out signal detection, because coil sensor can not receive the influence of geomagnetic field and magnetic field in the environment, can detect slight magnetic field change simultaneously, through set up coil sensor on detecting the door frame, can improve the detection precision who surveys the door effectively. In addition, the invention utilizes the phase and amplitude of the signal detected by the coil sensor to correspondingly compare the collected phase and amplitude information of the coil with the set phase and amplitude generated when the contraband passes through the detection door frame, thereby more accurately determining whether the specified contraband enters the detection door frame and further judging whether the contraband exists, and further improving the identification accuracy.
In another embodiment of the present invention, the determining whether the specified contraband enters the detection doorframe 1 according to the matching between the phase and amplitude of the signal detected by the coil sensor 2 and the phase and amplitude of the detection signal generated by the specified contraband passing through the detection doorframe 1 comprises:
predetermining the phase and amplitude of a detection signal generated when a specified contraband passes through the detection door frame 1; and comparing the phase and amplitude of the signal detected by the coil sensor 2 with the phase and amplitude of a detection signal generated when the specified contraband passes through the detection door frame 1, and if the comparison result meets a preset condition, determining that the specified contraband enters the detection door frame 1.
In this embodiment, different contraband may be made of different metals, and the different metals have different influences on the magnetic field in the coil sensor 2, so that the mapping relationship between the corresponding contraband and the phase and amplitude in the coil sensor 2 at that time is established by testing the phase and amplitude conditions of the voltage in the coil sensor 2 when the different contraband passes through the detection door frame in advance. Therefore, when a detected person passes through the detection gate, if the detected person carries contraband, the coil sensor generates corresponding changes of the phase and amplitude, whether the phase and amplitude conditions obtained at the moment are the same as those obtained by the test training in advance is judged by comparing the phase and amplitude conditions obtained at the moment with those obtained by the test training in advance, and if the phase and amplitude conditions exist, the detected person passing through the detection gate at the moment is judged to carry the corresponding contraband according to the corresponding relationship established in advance.
As shown in fig. 4, in one embodiment of the present invention, the designating contraband includes: a mobile phone and an electronic device comprising a circuit board; correspondingly, the phase and amplitude of the signal detected by the coil sensor 2 are compared with the phase and amplitude of the detection signal generated when the specified contraband passes through the detection door frame, and if the comparison result meets the preset condition, it is determined that the specified contraband enters the detection door frame, including:
acquiring an initial phase change value when a detected person enters a detection door frame, acquiring a process phase value or a process amplitude value of the detected person in the process of passing through the detection door frame if the initial phase change value is judged and acquired to be larger than zero, and determining that the detected person carries an aluminum-shell mobile phone if the process phase value is judged and acquired to be smaller than zero or the process amplitude value is determined to be smaller than zero;
if the initial phase change value is judged to be less than zero, acquiring a process phase value of the detected person in the process of passing through the detection door frame, and if the process phase value is judged to be always less than zero, determining that the detected person carries ironware;
and if the process phase value is judged and known to be larger than zero, determining that the detected person carries the electronic equipment with the circuit board.
Specifically, in the embodiment of the present invention, the metal is mainly detected, and the metal can be divided into paramagnetic materials and diamagnetic materials. The paramagnetic substance strengthens the magnetic field of the coil sensor 2, so that the phase of the voltage of the coil sensor 2 is more advanced, and the voltage shows a change larger than 0, and the amplitude change of the voltage also shows a situation larger than 0 because the magnetic field of the coil sensor 2 is strengthened. The same is true. The diamagnetic substances, in contrast, cause the phase of the voltage of the coil sensor 2 to lag, with a change of less than 0, a decrease in the amplitude of the voltage, and a change of less than 0.
The invention is to detect the mobile phone and the electronic equipment containing the circuit board, and the circuit board is made of copper, aluminum and other metals, and because copper is diamagnetic and aluminum is paramagnetic, when the contraband enters the magnetic field, the invention can generate complex influence, not single influence, on the magnetic field of the coil sensor 2, namely, the phase and amplitude of the coil sensor 2 are changed to be more than 0 or less than 0.
Therefore, when the material entering the detection doorframe 1 is aluminum, the phase of the voltage is greater than 0 when the detected person passes through the detection doorframe 1 (also called as an initial state), and the phase is always greater than 0 when the detected person passes through the detection doorframe 1 (also called as a process state), and the amplitude of the voltage is also greater than 0. When the phase of the initial state is greater than 0, the phase and the amplitude of the voltage are not constantly greater than 0 in the process state, the metal entering the detection door frame 1 at the beginning can be judged to be paramagnetic substances such as aluminum, and various different metals such as paramagnetic substances and diamagnetic substances exist in the process, so that the mobile phone can be judged to be an aluminum shell mobile phone, judged to be prohibited articles, and an alarm is given.
When the voltage phase entering the initial state of the detection doorframe 1 is less than 0, the metal entering the detection doorframe 1 at this time is judged to be diamagnetic copper, iron and the like. Therefore, under the condition of higher monitoring force requirement, the alarm can be given without distinguishing. In combination with the phase and amplitude data of the voltage in the process state, a distinction can be made that if the phase of the voltage in the process state is constantly less than 0, the metal can be judged to be a ferrous product, and since iron has strong diamagnetism, there are two cases, one is that the metal is iron, and the other is an iron-clad electronic device made due to the strong shielding effect of iron. And if the phase of the voltage changes in the process state, the electronic equipment containing the circuit board can be judged, and an alarm is given.
Specifically, the invention is a detection method for distinguishing different metals based on the phase and amplitude changes of the sensor. When a detected person passes through the detection door frame 1, 10 sensors distributed on the door frame of the detection door can detect the change of the phase and amplitude of the sensor in real time, all data are sent to an industrial control computer through a data acquisition card to be processed, the industrial control computer analyzes the change rule of the phase and amplitude, the scheme mainly identifies multimedia equipment according to the identification of a circuit board (containing copper), and the phase amplitude change generated by the sensors is different from that of equipment containing the circuit board when other metals pass through the detection door frame 1, so that whether forbidden multimedia equipment is carried or not is judged, and false reports can not be generated on metal accessories (aluminum products, silver products), belts (aluminum products) and the like of a human body.
In a specific embodiment of the invention, the opposite detection doorframe 1 is also provided with an infrared transmitter 3; the infrared transmitter 3 is used for detecting the time when the human body enters the door body and leaves the door body; when the infrared transmitter 3 detects that a human body enters the door body, triggering the industrial control computer to start detection; when the infrared transmitter 3 detects that a human body leaves the door body, the industrial control computer is triggered to stop detection.
Specifically, the infrared correlation device 3 comprises an active infrared transmitter and a passive infrared receiver, wherein the active infrared transmitter transmits infrared rays to the infrared receiver, and when the infrared rays between the infrared transmitter and the infrared receiver are blocked or blocked to a certain percentage, an alarm or other corresponding information is sent out. In the invention, the infrared transmitter 3 does not need to give out an alarm, but needs to send corresponding information that the infrared is blocked to the industrial control computer connected with the infrared transmitter. Since the infrared transmitter 3 is used to judge that a person passes through the detection doorframe 1 and determine the time when the person passes through the detection doorframe 1, the time is used to help the industrial control computer determine when to perform calculation processing on the received data of the coil sensor 2. Therefore, the infrared radiator 3 needs to be arranged at the front end of the detection doorframe 1, and specifically, the infrared radiator can be arranged on the side surface of the doorframe parallel to the plane formed by the two doorframes of the detection doorframe 1, and the side surface is the side surface which the detected person passes through before passing through the security inspection door. How the infrared opposite emitters 3 are opposite is that the infrared opposite emitters are at the same height or different heights, or an included angle is formed between the infrared rays and the ground, which is not limited in the invention, and only needs that the infrared rays between the infrared opposite emitters 3 are necessarily blocked when the detected person passes through the door frame 1.
In the embodiment of the invention, only one pair of infrared transmitter 3 is arranged at the entrance of the detection doorframe 1, so that only the time when the detected person enters the detection doorframe 1 can be judged, but the time when the detected person exits the detection doorframe 1 cannot be judged, and in order to reduce the calculated data amount of the industrial personal computer, the calculated data amount of the industrial personal computer can be set in the following two ways, namely, the first method is to set a fixed time interval, namely, after the time interval, the detected person can pass through the detection doorframe 1 and leave the detection doorframe 1. In the second method, the time when the second person enters the detection doorframe 1 is taken as the time when the last detected person leaves the detection doorframe 1, the data between the coil sensors 2 received in the time interval when the pair of infrared correlation devices 3 is interrupted is calculated, and corresponding processing is performed. The third method is that the set fixed time is combined with the time when the next detected person enters the detection doorframe 1 to judge the data in the time interval which needs to be processed by the industrial control computer, for example, the set time is compared with the time interval between two detected persons, and the smaller value is taken as the data amount in the corresponding time interval calculated by the industrial control computer. Other methods are used to determine the data for the industrial control computer to calculate the corresponding time the invention is not limited. And when the data processing is judged to be the data processing of the next person or the time interval of the current person for vehicle inspection reaches the specified time, adding one to the number of passing persons.
Preferably, two pairs of infrared radiators 3 are arranged on the detection door frame 1, wherein the infrared radiators 3 are used for defining the time when the detected person enters the detection door frame and the time when the detected person leaves the detection door frame respectively, so that the industrial control computer only needs to calculate the data change of the time period between two pairs of infrared triggers, the data amount calculated by the industrial control computer is reduced, and the efficiency and the precision are improved. Meanwhile, when the infrared transmitter detects that the detected person leaves the detection door, the number of people is added.
In an embodiment of the present invention, the present invention provides a metal detection method based on detecting a door frame 1, further comprising: and when the specified contraband is determined to enter the detection door frame 1, sound and light alarm prompt is carried out.
Specifically, the sound-light alarm device is connected with the industrial control computer, when the industrial control computer judges that the detected person carries the forbidden articles, an alarm signal is sent out, the sound-light alarm device gives an alarm, the detected person can take corresponding measures conveniently, and the security effect is guaranteed. The audible and visual alarm is an alarm capable of giving out alarm sound and warning light.
In this embodiment, the automatic alarm and recording mechanism automatically alarms and records the detected prohibited articles, can automatically operate without manual intervention in the detection process, and the recording result can be used for tracing the abnormal events.
In a specific embodiment of the invention, the detection door frame is connected with an image acquisition device and a display; and when the specified contraband is determined to enter the detection door frame 1, the image acquisition device acquires images and displays the acquired images on the display.
Specifically, set up image acquisition device on detecting door frame 1, when being detected the person through detecting door frame 1, obtain information such as the head portrait of gathering the person, when industrial control computer judges that being detected the person carries forbidden article, then with corresponding head portrait information transmission such as the face of gathering to the display, mark this position by the person who detects simultaneously, supply that the person who detects seeks, tracks. Meanwhile, the alarm number is added on the display, so that the data can be conveniently utilized later. The image acquisition device can be a camera and other devices with camera shooting functions. The display is the input and output device. It can be classified into CRT, LCD, PDP, OLED, etc., and the specific kind of the display is not limited in the present invention.
In one embodiment of the invention, a plurality of coil sensors 2 are uniformly arranged on a detection doorframe 1 which is arranged opposite to a detection door from top to bottom; accordingly, the phase and amplitude of the signal detected by the coil sensor 2 are acquired.
Specifically, a plurality of pairs of coil sensors 2 are arranged on a detection door frame 1 which is arranged oppositely on the detection door frame 1 from top to bottom and used for detecting different body parts of a detected person, the problems that detection signals obtained by a single detection point are incomplete, detection dead angles exist and the detection speed is low are solved.
Meanwhile, the coil sensors can be divided into different groups, wherein the different groups correspond to different sections of the detection door. Therefore, for the accuracy of detection, the detection of the person to be detected in the section can be realized by measuring the changes of the phase and amplitude values of the coil sensors 2 in different sections and according to the average value of the changes of the phase and amplitude values. The method for detecting the subareas not only can adopt an average value method, but also can adopt a method that the phase and amplitude change of any one coil sensor 2 in the coil sensors 2 in the subareas is consistent with the phase and amplitude change of the corresponding contraband to be detected, namely, the detected person is indicated to carry the contraband.
Meanwhile, in the above, the processing manner of the phase and amplitude acquired by each group of coil sensors 2 may be "alternative method" or "average value method". The so-called "alternative method" is that if the phase and amplitude of any one of the coil sensors 2 in the section are output after being input into the security test model and the phase and amplitude are displayed as carrying contraband, it is determined that the detected person carries the contraband in the body section or part corresponding to the coil sensor 2 in the section. The average value method is to obtain the values of the phase and amplitude of each group of coil sensors 2, calculate the average value of the phase and amplitude obtained by each group, input the obtained average value into a trained security test model, and judge that the body section of the detected person corresponding to the section where the group of coil sensors 2 is located carries contraband if the output result judges that the carried object corresponding to the phase and amplitude of the calculated average value is contraband.
As shown in fig. 3, further, in an embodiment provided by the present invention, a cross beam 7 is further disposed on the top of the detection doorframe 1; the beam 7 is a cavity structure and is used for accommodating electric wire lines.
Specifically, the safety detection door system of the invention is provided with the cross beam 7 on the two door bodies of the detection door, and the cross beam 7 is used for connecting the two door bodies, so that the purpose of stably arranging the door bodies can be achieved. In addition, because the door body is provided with the infrared transmitter 3 and the coil sensor 2, and the devices are connected with the data lines or the power supply lines, the beam is set to be a hollow structure, so that the circuits can penetrate through the door body, the circuits are not exposed, and the safety can be ensured, and the cleanness and the attractiveness of the door body can be ensured.
As shown in fig. 3, in an embodiment of the present invention, an image acquisition device 8 and a display 9 are disposed on the beam 7, wherein both the image acquisition device 8 and the display 9 are connected to the industrial control computer 4; the image acquisition device 8 is used for acquiring the image information of the detected user passing through the detected door frame, and the display 9 is used for displaying the image information acquired by the image acquisition device.
Specifically, the image acquisition device 8 is arranged on the detection door frame 1, when the detected user passes through the detection door, information such as a head portrait of an acquirer is acquired, when the industrial control computer 4 judges that the detected user carries contraband, the corresponding acquired image information is transmitted to the display 9, and meanwhile, the position of the detected user is marked for the inspector to find and track. Meanwhile, the alarm number is added on the display 9, so that the data can be conveniently utilized later. The image acquisition device can be a camera and other devices with camera shooting functions. The display 9 is an input-output device. It can be classified into CRT, LCD, PDP, OLED, etc., and the specific kind of the display is not limited in the present invention.
In yet another embodiment of the present invention, there is provided a metal detection apparatus, which is implemented based on a detection doorframe on which a coil sensor is provided; the metal detection device includes: an acquisition module, configured to acquire a phase and an amplitude of a signal detected by the coil sensor 2; and the judging module is used for determining whether the specified contraband enters the detection door frame 1 or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor 2 and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame 1.
Specifically, the coil sensor 2 is an inductance sensor, and is a sensor configured by an iron core and a coil and configured to convert a change in a linear or angular displacement into a change in inductance of the coil. The number of turns of the coil and the magnetic permeability of the material of the sensor are both constant, and the change of the inductance of the sensor is caused by the change of the geometric dimension of the magnetic circuit of the coil caused by the displacement input quantity. When the coil is connected to the measuring circuit and the excitation power source is switched on, a voltage or current output proportional to the displacement input can be obtained. The coil sensor 2 is arranged on the detection door frame 1, and a plurality of points are arranged from the upper part to the lower part of the detection door frame 1 to realize the overall detection of the detected object from head to foot, when the detected person passes through the detection door frame 1, the coil sensor 2 can generate different signal changes according to the difference of articles carried by the detected person. Here, the detecting doorframe 1 is arranged oppositely, the distance between the detecting doorframe 1 is enough to let the person to be detected pass through, and at the same time, the distance is not so far as to affect the measuring effectiveness of the coil sensor 2, and in addition, the detecting doorframe 1 can be embedded into the ground or arranged on the ground, the invention is not limited, and is suitable for stably arranging the detecting doorframe 1.
The industrial control computer detects whether contraband exists and the pair of coil sensors 2 between which the contraband is positioned by comprehensively analyzing the data of all the coil sensors. And collecting signals before and after change according to the change rule of the phase and the amplitude, and calculating the phase and the amplitude to obtain a final detection result. The pre-change signal refers to the phase and amplitude values of the coil sensor 2 obtained by the industrial computer when no person passes through the coil sensor. The changed signal refers to the corresponding values of the phase and the amplitude in the coil sensor 2, which are obtained by the industrial control computer when the detected person passes through the detection gate.
The acquisition module is used for acquiring the phase and amplitude of the signal detected by the coil sensor 2, and means that when a detected person passes through the detection door frame 1, the coil sensor 2 can generate a counteracting or strengthening effect on the magnetic field where the coil sensor 2 is located due to the paramagnetic or diamagnetic effect of the detected metal, so that the magnetic field where the coil of the coil sensor 2 is located is influenced, the phase and the magnitude of voltage and current in the coil are further influenced, and the material of a substance in the magnetic field can be judged by measuring the phase and the amplitude of the detected signal.
The judgment module tests contraband to be detected due to different magnetic field changes caused by different detected objects in the coil sensor 2, obtains the phase and amplitude of the coil sensor 2 when different contraband pass through the detection door frame 1, and forms corresponding data. When a detected person passes through the detection door frame 1, the detected person can judge whether the object is contraband or not by acquiring the phase and amplitude of the voltage in the coil sensor 2 at the moment and comparing the acquired phase and amplitude with the measured phase and amplitude data of the contraband passing through the coil sensor 2.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a metal detection method comprising: acquiring the phase and amplitude of a signal detected by the coil sensor; and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided above to perform a metal detection method comprising: acquiring the phase and amplitude of a signal detected by the coil sensor; and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the above-provided to perform a metal detection method, the metal detection method comprising: acquiring the phase and amplitude of a signal detected by the coil sensor; and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The metal detection method is characterized by being realized based on a detection door frame, wherein a coil sensor is arranged on the detection door frame;
the metal detection method comprises the following steps:
acquiring the phase and amplitude of a signal detected by the coil sensor;
and determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
2. The metal detection method of claim 1, wherein determining whether the designated contraband enters the detection door frame according to a match between the phase and amplitude of the signal detected by the coil sensor and the phase and amplitude of a detection signal generated by the designated contraband passing through the detection door frame comprises:
predetermining the phase and amplitude of a detection signal generated when a specified contraband passes through the detection door frame;
and comparing the phase and amplitude of the signal detected by the coil sensor with the phase and amplitude of a detection signal generated when the specified contraband passes through the detection door frame, and if the comparison result meets a preset condition, determining that the specified contraband enters the detection door frame.
3. The metal detection method of claim 2, wherein the designating contraband comprises: aluminum-shell mobile phones, ironware and electronic equipment containing circuit boards;
correspondingly, the phase and amplitude of the signal detected by the coil sensor are compared with the phase and amplitude of the detection signal generated when the specified contraband passes through the detection door frame, and if the comparison result meets the preset condition, the specified contraband is determined to enter the detection door frame, including:
acquiring an initial phase change value when a detected person enters a detection door frame, acquiring a process phase value or a process amplitude value of the detected person in the process of passing through the detection door frame if the initial phase change value is judged and acquired to be larger than zero, and determining that the detected person carries an aluminum-shell mobile phone if the process phase value is judged and acquired to be smaller than zero or the process amplitude value is determined to be smaller than zero;
if the initial phase change value is judged to be less than zero, acquiring a process phase value of the detected person in the process of passing through the detection door frame, and if the process phase value is judged to be always less than zero, determining that the detected person carries ironware;
and if the process phase value is judged and known to be larger than zero, determining that the detected person carries the electronic equipment with the circuit board.
4. The metal detection method of claim 3, wherein the oppositely disposed door frames are further provided with an infrared transmitter;
the infrared transmitter is used for detecting the time when a human body enters the door body and leaves the door body;
when the infrared transmitter detects that a human body enters the door body, the coil sensor is triggered to start detection;
and when the infrared transmitter detects that a human body leaves the door body, the coil sensor is triggered to stop detecting.
5. The metal detection method of claim 1, further comprising:
and when the specified contraband is determined to enter the detection door frame, carrying out sound-light alarm prompt.
6. The metal detection method of claim 5, wherein the door frame is connected with an image acquisition device and a display;
and when the specified contraband is determined to enter the detection door frame, the image acquisition device acquires images and displays the acquired images on the display.
7. The metal detection method of claim 1, wherein the oppositely disposed door frames are uniformly arranged with a plurality of coil sensors from top to bottom.
8. The metal detection device is characterized in that the metal detection device is realized based on a detection door frame, and a coil sensor is arranged on the detection door frame;
the metal detection device includes:
the acquisition module is used for acquiring the phase and amplitude of the signal detected by the coil sensor;
and the judging module is used for determining whether the specified contraband enters the detection door frame or not according to the matching condition of the phase and the amplitude of the signal detected by the coil sensor and the phase and the amplitude of the detection signal generated by the specified contraband passing through the detection door frame.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the metal detection method according to any of claims 1 to 7 are implemented when the program is executed by the processor.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of the metal detection method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110270548.8A CN113138423B (en) | 2021-03-12 | 2021-03-12 | Metal detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110270548.8A CN113138423B (en) | 2021-03-12 | 2021-03-12 | Metal detection method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113138423A true CN113138423A (en) | 2021-07-20 |
| CN113138423B CN113138423B (en) | 2022-09-02 |
Family
ID=76811040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110270548.8A Active CN113138423B (en) | 2021-03-12 | 2021-03-12 | Metal detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113138423B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023036002A1 (en) * | 2021-09-09 | 2023-03-16 | 青岛海尔洗涤电器有限公司 | Laundry treatment apparatus and control method therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201110898Y (en) * | 2007-10-15 | 2008-09-03 | 深圳市赛时特科技有限公司 | Duct type synthetic safety detecting door |
| CN102955000A (en) * | 2012-08-24 | 2013-03-06 | 电子科技大学 | Adaptive eddy displacement detecting method |
| CN107710024A (en) * | 2015-06-29 | 2018-02-16 | 株式会社荏原制作所 | Metal detection sensor and the metal detection method for having used the sensor |
| CN111190232A (en) * | 2020-03-05 | 2020-05-22 | 大同市快安科技有限公司 | Metal contraband detection device and multi-parameter comprehensive judgment method thereof |
| CN111751896A (en) * | 2019-03-27 | 2020-10-09 | 北京快安科技有限公司 | Three-dimensional display method for security inspection result |
-
2021
- 2021-03-12 CN CN202110270548.8A patent/CN113138423B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201110898Y (en) * | 2007-10-15 | 2008-09-03 | 深圳市赛时特科技有限公司 | Duct type synthetic safety detecting door |
| CN102955000A (en) * | 2012-08-24 | 2013-03-06 | 电子科技大学 | Adaptive eddy displacement detecting method |
| CN107710024A (en) * | 2015-06-29 | 2018-02-16 | 株式会社荏原制作所 | Metal detection sensor and the metal detection method for having used the sensor |
| CN111751896A (en) * | 2019-03-27 | 2020-10-09 | 北京快安科技有限公司 | Three-dimensional display method for security inspection result |
| CN111190232A (en) * | 2020-03-05 | 2020-05-22 | 大同市快安科技有限公司 | Metal contraband detection device and multi-parameter comprehensive judgment method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023036002A1 (en) * | 2021-09-09 | 2023-03-16 | 青岛海尔洗涤电器有限公司 | Laundry treatment apparatus and control method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113138423B (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101068344B (en) | Object detection apparatus | |
| US11366184B2 (en) | Position determination device and method | |
| CN106101590B (en) | The detection of radar video complex data and processing system and detection and processing method | |
| CN105403922A (en) | Weak magnetic detection method | |
| US20080027648A1 (en) | Detection-Object-Position-Specifying Device and Method of Specifying Position of Object to Be Detected | |
| CN104020371B (en) | Automatic test method for radiation sensitivity | |
| US20080117044A1 (en) | Passive Magnetic Detection System for Security Screening | |
| CN113156522A (en) | Safety detection method and device based on door frame detection | |
| US9727791B2 (en) | Person detection system, method, and non-transitory computer readable medium | |
| CN104567700A (en) | On-line measurement device for vehicle dimension | |
| CN110231642B (en) | Method and device for constructing radiation field map and robot | |
| CN113138423B (en) | Metal detection method and device | |
| US20110199077A1 (en) | Ferrous object detector | |
| CN106997447A (en) | Face identification system and face identification method | |
| CN114295649B (en) | Information association method, device, electronic equipment and storage medium | |
| CN110138471A (en) | A kind of detection method and relevant apparatus | |
| CN107578638A (en) | A kind of vehicle detecting sensor | |
| CN110259514A (en) | Danger zone personnel's method for early warning, storage medium, electronic equipment and early warning system | |
| CN110992418A (en) | Wire icing thickness monitoring system and method | |
| CN112885011B (en) | Intrusion detection method of optical fiber perimeter security system and related equipment | |
| CN104809840B (en) | A kind of intrusion detection method and system based on multisensor | |
| CN107089299A (en) | A kind of measuring system and its measuring method of ship inclination angle | |
| CN208872768U (en) | A kind of speed testing system | |
| CN216083133U (en) | Safety inspection door system | |
| US10453212B2 (en) | Wireless transmitting/receiving system, wireless receiving device and wireless transmitting/receiving method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |