CN105005083A - Safety inspection system based on conjugate electromagnetic transmit-receive array broadband detection and visual display and method thereof - Google Patents
Safety inspection system based on conjugate electromagnetic transmit-receive array broadband detection and visual display and method thereof Download PDFInfo
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Abstract
The invention provides a safety inspection system based on conjugate electromagnetic transmit-receive array broadband detection and visual display and a method thereof. The safety inspection system comprises a safety inspection detection front-end, a data processing background and a supporting frame. Conjugate electromagnetic transmit-receive units are provided at the safety inspection detection front-end so that transmitting and non-interference and low-interference directional magnetic receiving of a broadband detection magnetic signal can be realized. Coils are wound on two coil cores with the same geometrical shape so that conjugate electromagnetic transmitting pair are formed. A coil winding mode and the size and direction of current in the coils are adjusted so that magnetic field intensity of the coils at the geometric centre is enabled to be zero. Multiple conjugate electromagnetic transmitting pairs sharing the geometric centre are combined to form conjugate electromagnetic transmitting units. Directional magnetic receiving elements are arranged at the positions with no magnetic field or weak magnetic field of the conjugate electromagnetic transmitting units so that the conjugate electromagnetic transmit-receive units are obtained. The detected and received signals are processed and color-displayed at the data processing background. The size, the attribute and the position of a metal conductor can be rapidly and accurately detected and displayed by the system.
Description
Technical field:
The present invention relates to security protection detection system field, be specifically related to a kind of based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method.
Background technology:
Metal safe examination system is used for the metal that examinant's health is hidden, and as gun, controlled knife etc., are widely used in the public place that the stream of peoples such as airport, station, law court, convention meeting-place are larger.In these places, personnel are numerous, often have lawless person and carry the prohibited items such as weapons and wait for an opportunity crime, thus cause great casualties and property loss, cause extremely severe negative effect to society.And metal safe examination system is one of the most effective instrument, it has been widely used in, in the important safety installations such as airport, being through one of long practice test, effective security protection instrument.But there are following problems in existing metal safe examination system:
The first, no matter existing metal safe examination system is numeral or simulation, the interference of the magnetic signal that all can go directly by the interference of external environment condition and internal system, causes systems axiol-ogy can there is flase drop and undetected.The sensor of existing safe examination system is made up of transmitting coil and electromagnetic receiver part, and it both can externally environment emitting electromagnetic wave, also can receive the electromagnetic wave that external environment condition produces simultaneously.The equipment that external environment condition generates electromagnetic waves has a lot, and as outside radiation fields of meeting such as hi-line, large-scale motor, electric welding machine, intermediate frequency furnace, intercom and other adjacent safe examination systems, these magnetic fields can be disturbed, affect the normal detection of detector gate.In addition, because transmitting coil and electromagnetic receiver part are apart from very near, therefore electromagnetic receiver part can receive the electromagnetic signal directly coming from transmitting coil, i.e. through magnetic signal.This through magnetic signal intensity is large, causes interference to the reception of induced magnetism signal.
The second, the quantity of information entrained by signal that existing metal safe examination system is launched is large not.From the pattern of the electromagnetic signal of launching, existing metal safe examination system product dominant emission sine wave or pulsating wave, have some patents then to propose to utilize stepping sweep sine to carry out detecting (as patent 200710123855.3).According to Shannon information theory, the quantity of information that signal carries and signal duration, signal bandwidth are relevant, and signal duration is longer, bandwidth is wider, and the detection information carried is abundanter.And pulsating wave temporal duration is very short, by the impact of launching hardware device, its actual band is also narrower, is therefore unfavorable for carrying of detection information in theory, is easy to affected by noise.And sinusoidal wave, very bandwidth is narrow, is also unfavorable for carrying of information.Swept-frequency signal is the discrete one group of sinusoidal signal of frequency, and the ability of carry information is not as good as chirp.
3rd, present detector gate system, when people passes through and detects metal, can sound the alarm, and not have visual interface, cannot learn the particular location of metal.
In a word, there is lower, the non-problem such as visual of poor anti jamming capability, accuracy of detection in existing metal detector gate system.
Summary of the invention:
In order to overcome, existing metal detector gate system rejection to disturbance is poor, accuracy of detection is lower, the non-problem such as visual, the present invention proposes a kind of based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method, broadband electromagnetical detectable signal sends, noiseless or low interference magnetic signal receives to use conjugation electromagnetism transmitting-receiving array to realize, digitized signal disposal route is utilized to carry out the analysis of detected target contours extract and detection data, and with color visualization interface display, realize easily and fast, safe examination system accurately.
According to Maxwell equation, the exchange current in coil can produce alternating magnetic field.When metallic conductor is by alternating electromagnetism field excitation, eddy current is produced in metallic conductor, and this electric current launches a but magnetic field that direction contrary identical with former field frequency, be called secondary magnetic field or Induced magnetic field, just can be finally inversed by position, the attribute and size etc. of metallic conductor by the direction and intensity detecting this magnetic field.
According to Ampère law, if exchange current contrary through direction in two identical coils of shape, by the size of wideband alternating electric current in adjustment coil, make the magnetic direction of the geometric center place generation at them contrary, size is identical, and after superposition, magnetic field intensity is zero.If magnetic induction part to be placed on their geometric center position, and when having other metallic conductor in space, the magnetic signal that so this magnetic induction part receives is the induced magnetism signal that metallic conductor excites by alternating magnetic field, and not by the interference of the through magnetic signal of coil transmissions.
Meanwhile, at the geometric center face of two coils and the neighborhood in geometric center face, magnetic field weakens mutually, and after superposition, magnetic field is more weak; If magnetic induction part to be placed on the geometric center face of two coils and the neighborhood in geometric center face, and when having other metallic conductor in space, so this magnetic induction part is while receiving the Induced magnetic field of metallic conductor, also can be subject to the interference of the through magnetic signal of coil transmissions, but this interference is very little.Based on above-mentioned principle, the present invention proposes a kind of based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method.
A kind of based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, comprise safety check detection front end, data processing backstage and bracing frame.The transmission of data is carried out by wired or wireless data transmission technology in safety check detection front end and data processing backstage.Bracing frame is used for fixing safety check detection front end.
A kind of based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method, carry out the transmission of wideband alternating magnetic signal and the reception of induced magnetism signal by the conjugation electromagnetism transmitting-receiving array of safety check detection front end.The array that conjugation electromagnetism transmitting-receiving array is made up of multiple conjugation electromagnetism Transmit-Receive Unit, multiple conjugation electromagnetism Transmit-Receive Unit is fixed on bracing frame, and arrangement mode can be determined according to concrete application demand.Such as, for detector gate system, bracing frame is doorframe, and conjugation electromagnetism Transmit-Receive Unit forms array along the arrangement of doorframe edges close.
Above-mentioned conjugation electromagnetism Transmit-Receive Unit comprises conjugation electromagnetism transmitting element and directed magnetic receiving array.
The conjugation electromagnetism transmitting element of above-mentioned conjugation electromagnetism Transmit-Receive Unit is sent by some conjugation electromagnetism to common geometric center and obtains combination.Described conjugation electromagnetism sends referring to: in two identical coil core of geometric configuration, be wound with coil respectively, the canoe of coil is identical, in coil, the polarity of electric current access is contrary, and make the direction of current one in two coils be clockwise, another is counterclockwise.Described conjugation electromagnetism sends also can being be wound with coil respectively in two identical coil core of geometric configuration, the canoe of coil is completely contrary, in coil, the polarity of electric current access is identical, and make the direction of current one in two coils be clockwise, another is counterclockwise.Coil core can be that the material that iron or the magnetic permeability such as iron nickel or siliconized plate are higher is made.According to Ampère law, if do not have other Magnetic Field Source, as long as the size of current that above-mentioned conjugation electromagnetism sends in two right coils is identical, so at the geometric center place of two coils, magnetic field intensity is zero; In the geometric center face of two coils and the neighborhood in geometric center face, magnetic field is more weak.If there is other Magnetic Field Source in space, so sent the electric current in two coils by adjustment conjugation electromagnetism, can make at the electromagnetism intensity at their geometric center place is zero; Now, in the geometric center face of two coils and the neighborhood in geometric center face, magnetic field is more weak.
The directed magnetic receiving array of above-mentioned conjugation electromagnetism Transmit-Receive Unit, comprise multiple directed magnetic receiving element, according to practical application request, the magnetic signal multiple directed magnetic receiving element being arranged in above-mentioned conjugation electromagnetism transmitting element is the position of zero or more weak, such as, if it is right that conjugation electromagnetism transmitting element only comprises a pair conjugation electromagnetism transmission, so directed magnetic receiving element is placed on conjugation electromagnetism and sends right geometric center place, in addition, also can arrange that several directed magnetic receiving elements send right geometric center face at conjugation electromagnetism, arrange that a small amount of directed magnetic receiving element sends in the neighborhood to geometric center face at conjugation electromagnetism.If it is right that the conjugation electromagnetism that conjugation electromagnetism transmitting element comprises multipair geometric center altogether sends, so directed magnetic receiving element is placed on conjugation electromagnetism and sends right geometric center place, in addition, also can arrange the geometric center lines of several directed magnetic receiving elements at conjugation electromagnetism transmitting element, arrange the neighborhood of a small amount of directed magnetic receiving element in conjugation electromagnetism transmitting element geometric center lines.Directed magnetic receiving element is fixed by support, and the material of support should be selected not affect the nonmetal of magnetic field.
The directed magnetic receiving element of above-mentioned directed magnetic receiving array, receive magnetic signal and be converted to electric signal, it is characterized in that being combined by multiple magnetic induction part and a metal magnetic field shielding case, magnetic induction part can be magneto sensor or coil or other magnetic induction part.Multiple magnetic induction part composition omnidirectionals magnetic field receiving element, can obtain directive magnetic vector in space.If adopt three magneto-dependent sensors, then three magneto-dependent sensors need to place in space on mutually perpendicular three directions, can receive directive magnetic vector in space to make the magnetic field receiving element formed.Add a metal magnetic field shielding case in certain face of above-mentioned omnidirectional magnetic field receiving element, make the magnetic field conductively-closed in certain direction, and the magnetic field coming from other directions beyond radome can only be received, obtain directed magnetic receiving element.In actual applications, the metallic shield of directed magnetic receiving element should be placed on the side away from detecting target, and in such as detector gate system, the metallic shield of directed magnetic receiving element should be placed on the side of close frame outdoors.
The described safety check detection front end based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system comprises the transmitting-receiving of conjugation electromagnetism array, image collecting device, data transmission module, data processing module and current control module.Data transmission module is connected with data processing module, and data processing module is connected with current control module, and current control module receives and dispatches array with conjugation electromagnetism, image collecting device is connected.
The image collecting device of safety check detection front end, for gathering the image of detected target, is namely camera.Camera should be arranged on bracing frame can photograph detected target overall picture position on, the top of such as detector gate, can photograph the overall picture of personnel by detector gate and article.
The conjugation electromagnetism transmitting-receiving array of safety check detection front end is for sending wideband detectable signal, receiving magnetic signal and be converted to electric signal.The magnetic signal of conjugation electromagnetism transmitting-receiving received by array may be the interference magnetic signal that in space exploration, other Magnetic Field Source sends, and also may be the induced magnetism signal excited by detected metallic conductor, after reception, be converted to electric signal, be called magnetoelectricity signal.
The data transmission module of safety check detection front end is used for and the mutual of data is carried out on data processing backstage, and its data transmission technology adopted is existing wired or wireless data transmission technology, does not then describe in detail.
The data processing module of safety check detection front end comprises data processing unit and data storage cell, data storage cell for store wideband detectable signal and current amplitude control signal, conjugation electromagnetism transmitting-receiving array received to magnetoelectricity signal and the picture signal etc. that arrives of image acquisition device, data processing unit is then for controlling safety check detection front end, produce wideband detectable signal and current amplitude control signal and carry out some pre-service to the received signal, such as filtering, denoising, amplification etc.
The current control module of safety check detection front end comprises A/D converter, D/A converter and current control circuit.The digital signal that D/A converter is used for data processing unit exports is converted to simulating signal, this analog passband signal excess current control circuit generation current afterwards, is input to each coil of each electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.Conjugation electromagnetism transmitting-receiving array received to magnetic signal and the picture signal that receives of image collecting device after A/D conversion, be input to the data processing module of safety check detection front end, carried out the process such as filtering, denoising, amplification by the data processing unit of data processing module after, give data transmission blocks and send to data processing backstage.
The described data processing backstage based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system comprises data transmission module, data processing module and human-computer interaction module.Described human-computer interaction module is connected with data processing module, and data processing module is connected with data transmission module again.
The human-computer interaction module on described data processing backstage comprises keyboard, display screen etc., arrange the parameter of wideband detectable signal for system user and check result of detection, the parameter that can arrange comprises the duration etc. of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal.
The data processing module on described data processing backstage comprises data processing unit and data storage cell.Data processing unit be used for control data process backstage modules, to receive come from the safety check detection magnetoelectricity signal of front end and image acquisition device to picture signal process: comprise the information such as the position of the metallic conductor that the profile that extracts detected target from image and inverting detect, attribute and size, and output to human-computer interaction module and show.Data storage cell is then for storing the information needing in wideband detectable signal, current amplitude control signal, the magnetoelectricity signal received and image information and some other process to store.
The data transmission module on described data processing backstage is used for detecting front end with safety check and carries out the mutual of data, and its data transmission technology used should be detect the corresponding wireless or wired data transmission technology of the data transmission module of front end with safety check.
Receive and dispatch the course of work of the detection of array wideband and visual display safe examination system and method based on conjugation electromagnetism, comprise magnetic field pre-calibration process and detection process.
Described magnetic field pre-calibration process is when the start of each safe examination system runs or when testing environment changes, and detects magnetic signal that some other Magnetic Field Source beyond target sends produce interference to directed magnetic receiving element and the pre-calibration process that carries out to reject space exploration.Before system starts detection, namely the detection of a target is not being had through safe examination system, conjugation electromagnetism in adjustment conjugation electromagnetism transmitting element sends the size of current in coil, the magnetic field intensity being positioned at the directed magnetic receiving element at geometric center place in each conjugation electromagnetism Transmit-Receive Unit is made to be zero, or lower than the threshold value preset.The step of described magnetic field pre-calibration process comprises:
Step 1. system user is by the parameter of the human-computer interaction module input wideband detectable signal on data processing backstage.Parameter comprises the duration etc. of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal.The data transmission module of this parameter through data processing backstage sends to safety check to detect front end.
Step 2. safety check detection front end receiver wideband detectable signal parameter, and produce wideband detectable signal.In safety check detection front end, data transmission module is input to data processing module after receiving the parameter of wideband detectable signal.Produce wideband detectable signal and current amplitude control signal at the data processing module of safety check detection front end, and be stored in data storage cell.
Step 3. safety check detection front end sends wideband detection magnetic signal.The data processing module of safety check detection front end exports wideband detectable signal and current amplitude control signal to current control module, in current control module after D/A conversion, produce corresponding electric current at current control circuit and be input in the coil of each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.
The directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position of step 4. safety check detection front end receives interference magnetic signal.Each directed magnetic receiving element being arranged in conjugation electromagnetism transmitting element geometric center place in conjugation electromagnetism transmitting-receiving array receives interference magnetic signal, and is converted to electric signal, obtains interference magnetoelectricity signal.And carry out A/D conversion in the current control module of safety check detection front end after, be input to the data processing module of safety check detection front end.
The data processing module adjustment current amplitude control signal of step 5. safety check detection front end.Safety check detection front end data processing module the pre-service such as filtering, denoising, amplification are carried out to the interference magnetoelectricity signal received after, data processing module judges whether the interference magnetoelectricity signal that each the directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position receives is zero, if be zero, then do not need adjustment current amplitude control signal, enter step 6.Also can set one according to actual needs close to the threshold value of 0, judge whether the interference magnetic signal received is less than this threshold value, if be less than, then thought that interference can be ignored, does not need readjust current amplitude control signal, enter step 6; If non-vanishing or be not less than the threshold value of setting, then illustrate in space have other Magnetic Field Source, therefore data processing module adjustment current amplitude control signal, the interference magnetic signal that the directed magnetic receiving element making each be positioned at conjugation electromagnetism transmitting element geometric center position receives is zero or is less than the threshold value of setting, store new current amplitude control signal, enter step 3;
Current amplitude control signal after adjustment is given data transmission module and is sent to data processing backstage by step 6. safety check detection front end, and the data processing module being input to data processing backstage after the data transmission module reception on data processing backstage stores.Pre-calibration process terminates.
The described detection process based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system comprises following steps:
Step 1. safety check detection front end sends wideband detection magnetic signal.The data processing unit of safety check detection front end reads the wideband detectable signal and current amplitude control signal that store in the data store, and carry out after D/A conversion through current control module, produce at current control circuit the coil that corresponding electric current is input to each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.
Step 2. safety check detection front end receiver detection magnetic signal and collection image information.Each directed magnetic receiving element in conjugation electromagnetism transmitting-receiving array receives magnetic signal and is converted to electric signal, i.e. magnetoelectricity signal; Image acquisition device is detected the picture signal of target.By magnetoelectricity signal and picture signal after data processing module carries out the pre-service such as denoising, amplification, send to data processing backstage by the data transmission module of safety check detection front end.
Step 3. data processing backstage receives magnetoelectricity signal and picture signal.After the data transmission module on data processing backstage receives magnetoelectricity signal and picture signal, be input to the data processing module on data processing backstage.
Step 4. data processing background process magnetoelectricity signal and picture signal.At the data processing module on data processing backstage, the intensity of the signal received according to each directed magnetic receiving element of the magnetoelectricity signal analysis received and direction, be finally inversed by the information such as the position at metallic conductor place, attribute and size.Meanwhile, data processing module carries out to picture signal the profile parameters analysis detecting target, extracts the profile of detected target.
Step 5. data processing backstage display result of detection.At human-computer interaction module, simultaneously with the position of the profile of different colours display detected target and metal, attribute and size etc.
The invention has the beneficial effects as follows:
1, realizing while magnetic signal is launched, ensureing that the reception of detection induced magnetism signal is not by the interference of launching through magnetic signal.The present invention devises conjugation Electromagnetic Launching unit, difference winding around in an identical manner in two identical coil core of geometric configuration, if the size of current in coil is identical, access polarity is contrary, the direction of current one in two coils is made to be clockwise, another is counterclockwise, so at their geometric center place, magnetic field intensity is zero.Or difference winding around in the opposite manner in two identical coil core of geometric configuration, if the size of current in coil is identical, access polarity is identical, the direction of current one in two coils is made to be clockwise, another is counterclockwise, so at their geometric center place, magnetic field intensity is also zero.When the magnetic field at geometric center place is zero, at their geometric center face and the neighborhood in geometric center face, magnetic field intensity is faint.Therefore, magnetic induction part is placed on this geometric center position, can avoids launching the interference of through magnetic signal to magnetic induction part, magnetic induction part is placed on geometric center face and neighborhood thereof, magnetic field is more weak, can reduce and launch through magnetic signal to the interference of magnetic induction part.
2, the reception of induced magnetism signal is not by the interference of other Magnetic Field Source signal.The present invention has carried out pre-calibration process before detection, if namely there is other Magnetic Field Source in space exploration, so by the size of the electric current of adjustment conjugation Electromagnetic Launching centering two coils, make the geometric center place at them, magnetic field intensity is zero.Doing so avoids some other Magnetic Field Source in detection space, such as contiguous safe examination system, large-size machine, intercom etc. are for the interference of magnetic induction part.
3, the present invention utilizes wideband detectable signal to detect, and signal bandwidth is wide, the duration is long, therefore, it is possible to carry the information of the more detection of a target.
4, the magnetic signal received is converted to electric signal by the present invention, and is input to the treatment and analysis that digital signal processing unit carries out parameter after digitizing, and the precision of detection is higher than and utilizes the method for hardware or simulation to detect.
5, at human-computer interaction module, the detected profile of target of display simultaneously and the position of detected metallic conductor, make staff's energy quick position to the position of metallic conductor, and do not need to carry out quadratic search again.
Accompanying drawing illustrates:
Fig. 1 is the system chart of the embodiment of the present invention;
Fig. 2 is that the conjugation electromagnetism of the embodiment of the present invention sends right schematic diagram;
Fig. 3 is the schematic diagram of the conjugation electromagnetism transmitting element of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the directed magnetic receiving element of the embodiment of the present invention;
The schematic diagram of the conjugation electromagnetism Transmit-Receive Unit of Fig. 5 embodiment of the present invention;
The conjugation electromagnetism Transmit-Receive Unit top cross-sectional view of Fig. 6 embodiment of the present invention;
The conjugation electromagnetism transmitting-receiving array schematic diagram of Fig. 7 embodiment of the present invention;
Fig. 8 is the data processing backstage block diagram of the embodiment of the present invention;
Fig. 9 is the magnetic field pre-calibration step process flow diagram of the embodiment of the present invention;
Figure 10 is the system looks process steps process flow diagram of the embodiment of the present invention.
Embodiment:
The present embodiment, for detector gate, is described further the specific embodiment of the present invention by reference to the accompanying drawings, but enforcement of the present invention is not limited thereto.
As shown in Figure 1, be the block diagram receiving and dispatching the detection of array wideband and visual display safe examination system based on conjugation electromagnetism of the present invention.Described safe examination system comprises safety check detection front end, data processing backstage and bracing frame.In the present embodiment, namely the doorframe of detector gate is bracing frame, and each module of safety check detection front end is placed on detector gate, carries out information interaction by wired or Wireless Data Transmission mode and data processing backstage.
The described safety check detection front end based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system comprises the transmitting-receiving of conjugation electromagnetism array, image collecting device, data transmission module, data processing module and current control module.Data transmission module is connected with data processing module, and data processing module is connected with current control module, and current control module receives and dispatches array with conjugation electromagnetism, image collecting device is connected.
The image collecting device of safety check detection front end, for gathering the image of detected target, is namely camera.Camera should be arranged on bracing frame can photograph detected target overall picture position on, the top of such as detector gate, can photograph the overall picture of personnel by detector gate and article.The data transmission module of safety check detection front end is used for and the mutual of data is carried out on data processing backstage, and its data transmission technology adopted is existing wired or wireless data transmission technology, such as Wifi etc.The conjugation electromagnetism transmitting-receiving array of safety check detection front end is for sending wideband detectable signal, receiving magnetic signal and be converted to electric signal.The magnetic signal of conjugation electromagnetism transmitting-receiving received by array may be the interference magnetic signal that in space exploration, other Magnetic Field Source sends, and also may be the induced magnetism signal excited by detected metallic conductor, after reception, be converted to electric signal, be namely magnetoelectricity signal.The data processing module of safety check detection front end comprises data processing unit and data storage cell, data storage cell for store wideband detectable signal and current amplitude control signal, conjugation electromagnetism transmitting-receiving array received to signal and the picture signal that arrives of image acquisition device, data processing unit is then for controlling safety check detection front end, produce wideband detectable signal and current amplitude control signal and carry out some pre-service to the received signal, such as filtering, denoising, amplification etc.The current control module of safety check detection front end comprises A/D converter, D/A converter and current control circuit.The digital signal that D/A converter is used for data processing unit exports is converted to simulating signal, and this analog passband signal excess current control circuit produces corresponding electric current afterwards, is input in each coil of each electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.The data that conjugation electromagnetism transmitting-receiving array and image collecting device receive are after A/D conversion, be input to data processing module, carried out the process such as filtering, denoising, amplification by the data processing unit of data processing module after, give data transmission blocks and send to data processing backstage.
That conjugation electromagnetism sends right schematic diagram as shown in Figure 2.In the present embodiment conjugation electromagnetism send to for: 201 is a pair coil core, and to be that the conjugation electromagnetism of triangular pyramids sends right, and 202 is coil core, and to be that the conjugation electromagnetism of rectangular cylinder sends right.Every is all for a pair identical two coil core of geometric configuration, and coil core is wound with coil in an identical manner, and the electric current access polarity in coil is contrary, and make the direction of current one in two coils be clockwise, another is counterclockwise.203 is a pair coil core, and to be that right cylinder conjugation electromagnetism sends right, and this cylindrical coil core is wound with coil in the opposite manner, and the electric current access polarity in coil is identical, and make the direction of current one in two coils be clockwise, another is counterclockwise.Conjugation electromagnetism sends also can being other geometric configuration.
The schematic diagram of conjugation electromagnetism transmitting element as shown in Figure 3.Conjugation electromagnetism transmitting element is sent combining by some conjugation electromagnetism to common geometric center.In the present embodiment, conjugation electromagnetism transmitting element sends combining the conjugation electromagnetism of common geometric center by three.They are that conjugation electromagnetism that the coil core of 301 triangular pyramids is made sends the conjugation electromagnetism made the coil core of, 302 rectangular cylinders and sends and send the conjugation electromagnetism made with 303 cylindrical coil core right respectively, and 304 is their geometric center positions.According to Ampère law, if do not have other Magnetic Field Source, as long as the size of current that every a pair conjugation electromagnetism sends in centering two coils is identical, so at the geometric center place of magnetic core, magnetic field intensity is zero.If there is other Magnetic Field Source in space, so sent the electric current in coil by adjustment conjugation electromagnetism, making in the magnetic field intensity at their geometric center place is zero.
Be described directed magnetic receiving element as shown in Figure 4, it is characterized in that being combined by multiple magnetic induction part and a metallic shield, magnetic induction part can be magneto sensor also can be coil or other magnetic induction part.By in three magneto sensors placements in space mutually perpendicular three directions in the present embodiment, the magnetosensitive receiver of composition is omnidirectional's electromagnetic field receivers, can obtain directive magnetic vector.Add a metal magnetic field shielding case in certain face of above-mentioned omnidirectional electromagnetic field receivers, make the magnetic field conductively-closed in certain direction, and the magnetic field coming from other directions beyond radome can only be received, obtain directed magnetic receiving element.
As Fig. 5 be as described in the schematic diagram of conjugation electromagnetism Transmit-Receive Unit, conjugation electromagnetism Transmit-Receive Unit comprises conjugation electromagnetism transmitting element and directed magnetic receiving array.Utilize non-metal frame by multiple directed magnetic receiving element fixed placement in the geometric center lines and neighborhood thereof of the geometric center position of conjugation electromagnetism transmitting element, conjugation electromagnetism transmitting element, form directed magnetic receiving array.In Fig. 5,501, it is right that 502,503 be triangular pyramids respectively, the conjugation electromagnetism made of rectangular cylinder, cylindrical coil core sends, 504,505,506 is the directed magnetic receiving element being positioned at the geometric center position of conjugation electromagnetism transmitting element, geometric center lines, geometric center lines neighborhood respectively, 507 is the supports for fixed orientation magnetic receiving element, and its material should be the non-metallic material not affecting magnetic field.
It is the sectional view in the AA face of the conjugation electromagnetism Transmit-Receive Unit of Fig. 5 shown in Fig. 6.601, it is right that 602,603 be triangular pyramids respectively, the conjugation electromagnetism made of rectangular cylinder, cylindrical coil core sends, 604 is be placed on the directed magnetic receiving element in the geometric center position of conjugation electromagnetism transmitting element and geometric center lines, and 605 is the directed magnetic receiving elements being placed on conjugation electromagnetism transmitting element geometric center lines neighborhood.
The conjugation electromagnetism transmitting-receiving array in the present embodiment detector gate system as shown in Figure 7, the array that conjugation electromagnetism transmitting-receiving array is made up of multiple conjugation electromagnetism Transmit-Receive Unit, multiple conjugation electromagnetism Transmit-Receive Unit is fixed on bracing frame, and the doorframe edges close namely around detector gate arranges.During arrangement, the metallic shield in the directed magnetic receiving element in each conjugation electromagnetism transmitting-receiving array should be placed on the position outside detector gate, for shielding the interference magnetic signal of detector gate outside.701 is conjugation electromagnetism Transmit-Receive Unit, and multiple conjugation electromagnetism Transmit-Receive Unit forms array along door edge close-packed arrays.702 is camera.
The block diagram on data processing backstage of the present invention as shown in Figure 8.Data processing backstage comprises data transmission module, data processing module and human-computer interaction module.Described human-computer interaction module is connected with data processing module, and data processing module is connected with data transmission module again.
The human-computer interaction module on described data processing backstage comprises keyboard, display screen etc., arrange the parameter of wideband detectable signal for system user and check result of detection, the parameter that can arrange comprises the duration etc. of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal.The data processing module on described data processing backstage comprises data processing unit and data storage cell.Data processing unit is used for control data process backstage modules, process receives come from the safety check detection magnetoelectricity signal of front end and image acquisition device to picture signal: comprise the information such as the position of the metallic conductor that the profile that extracts detected target from image and inverting detect, attribute and size, and output to human-computer interaction module and show.Data storage cell is then for storing the information needing in wideband detectable signal, current amplitude control signal, the magnetoelectricity signal received and image information and some other process to store.The data transmission module on described data processing backstage is used for detecting front end with safety check and carries out the mutual of data, and its data transmission technology used should be detect the corresponding wireless or wired data transmission technology of the data transmission module of front end with safety check.
Described based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method, the course of work comprises magnetic field pre-calibration process and detection process.When each start or when testing environment changes, pre-calibration be carried out, below in conjunction with Fig. 9, pre-calibration step during each use system is described:
Step 1. user is by the parameter of the human-computer interaction module input wideband detectable signal on data processing backstage.Parameter comprises the duration etc. of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal.If the mode of frequency regulation of the parameter wideband detectable signal that user is arranged is linear frequency modulation, initial frequency 3.5MHz, i.e. f
0=3.5MHz.Cutoff frequency is 5MHz, i.e. f
1=5MHz.Duration T=20ms.The data transmission module of this parameter through data processing backstage sends to safety check to detect front end.
Step 2. safety check detection front end receiver wideband detectable signal parameter, and produce wideband detectable signal.In safety check detection front end, data transmission module is input to data processing module after receiving the parameter of wideband detectable signal.Produce wideband detectable signal and current amplitude control signal at the data processing module of safety check detection front end, and be stored in data storage cell.
Produce linear FM signal as wideband detectable signal according to the parameter of user's input, its expression formula is:
Wherein, ω
0the initial angle frequency of linear FM signal, ω
0=2 π f
0/ f
s, f
sfor sampling rate, k is frequency modulation rate, k=(f
1-f
0)/(f
s 2t).N is the sample number of digital signal, N=f
st.
for phase place, random initial phase can be got.A is the amplitude of wideband detectable signal.Current Control range signal needs the size providing current amplitude in each coil, is namely the value providing current amplitude A in each coil in each conjugation Transmit-Receive Unit.
Step 3. safety check detection front end sends wideband detection magnetic signal.The data processing module of safety check detection front end exports wideband detectable signal and current amplitude control signal to current control module, in current control module after D/A conversion, produce corresponding electric current at current control circuit and be input in the coil of each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.
The directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position of step 4. safety check detection front end receives interference magnetic signal.Each directed magnetic receiving element being arranged in conjugation electromagnetism transmitting element geometric center place in conjugation electromagnetism transmitting-receiving array receives interference magnetic signal, and is converted to electric signal, obtains interference magnetoelectricity signal.And carry out A/D conversion in the current control module of safety check detection front end after, be input to the data processing module of safety check detection front end.
The data processing module adjustment current amplitude control signal of step 5. safety check detection front end.Safety check detection front end data processing module the pre-service such as filtering, denoising, amplification are carried out to the interference magnetoelectricity signal received after, data processing module judges whether the interference magnetoelectricity signal that each the directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position receives is zero, if be zero, then do not need adjustment current amplitude control signal, enter step 6.Also can set one according to actual needs close to the threshold value of 0, judge whether the interference magnetic signal received is less than this threshold value, if be less than, then thought that interference can be ignored, does not need readjust current amplitude control signal, enter step 6; If non-vanishing or be not less than the threshold value of setting, then illustrate in space have other Magnetic Field Source, therefore data processing module adjustment current amplitude control signal, the interference magnetic signal that the directed magnetic receiving element making each be positioned at conjugation electromagnetism transmitting element geometric center position receives is zero or is less than the threshold value of setting, store new current amplitude control signal, enter step 3;
Current amplitude control signal after adjustment is given data transmission module and is sent to data processing backstage by step 6. safety check detection front end, and the data processing module being input to data processing backstage after the data transmission module reception on data processing backstage stores.Pre-calibration process terminates.
After pre-calibration process terminates, system can start detection.Now, the directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position is not subject to the interference of through magnetic signal, not by the interference of other Magnetic Field Source while receiving induced magnetism signal yet.The interference suffered by directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center lines and neighborhood thereof is also less.Below in conjunction with Figure 10, the detection process receiving and dispatching the detection of array wideband and visual display safe examination system based on conjugation electromagnetism described in introduction, comprises following steps:
Step 1. safety check detection front end sends wideband detection magnetic signal.The data processing unit of safety check detection front end reads the wideband detectable signal and current amplitude control signal that store in the data store, and carry out after D/A conversion through current control module, produce at current control circuit the coil that corresponding electric current is input to each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array.
Step 2. safety check detection front end receiver detection magnetic signal and collection image information.Each directed magnetic receiving element in conjugation electromagnetism transmitting-receiving array receives magnetic signal and is converted to electric signal, i.e. magnetoelectricity signal; Image acquisition device is detected the picture signal of target.By magnetoelectricity signal and picture signal after data processing module carries out the pre-service such as denoising, amplification, send to data processing backstage by the data transmission module of safety check detection front end.
Step 3. data processing backstage receives magnetoelectricity signal and picture signal.After the data transmission module on data processing backstage receives magnetoelectricity signal and picture signal, be input to the data processing module on data processing backstage.
Step 4. data processing background process magnetoelectricity signal and picture signal.At the data processing module on data processing backstage, the intensity of the signal received according to each directed magnetic receiving element of the magnetoelectricity signal analysis received and direction, be finally inversed by the information such as the position at metallic conductor place, attribute and size.Meanwhile, data processing module carries out profile parameters analysis to picture signal, extracts the profile of detected target.
Step 5. data processing backstage display result of detection.At human-computer interaction module, simultaneously with the position of the profile of different colours display detected target and metal, attribute and size etc.
Claims (10)
1. based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that system comprises safety check detection front end, data processing backstage and bracing frame, data transmission is carried out in a wired or wireless fashion between safety check detection front end and data processing backstage, safety check detection front end is fixed on bracing frame, safety check detection front end is by a kind of conjugation electromagnetism Transmit-Receive Unit composition conjugation electromagnetism transmitting-receiving array, send wideband detection magnetic signal and realize the directed magnetic of noiseless or low interference and receive, data processing backstage is analyzed digitized detection Received signal strength, store and display.
2. according to claim 1 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that the array that the conjugation electromagnetism transmitting-receiving array of safety check detection front end is made up of multiple conjugation electromagnetism Transmit-Receive Unit, multiple conjugation electromagnetism Transmit-Receive Unit is fixed on bracing frame, the arrangement mode of multiple conjugation electromagnetism Transmit-Receive Unit can be determined according to concrete application demand, for detector gate, the doorframe of detector gate is exactly bracing frame, and multiple conjugation electromagnetism Transmit-Receive Unit arranges along detector gate edge edge.
3. according to claim 2 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that conjugation electromagnetism Transmit-Receive Unit comprises conjugation electromagnetism transmitting element and directed magnetic receiving array.
4. according to claim 3 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that the conjugation electromagnetism transmitting element of conjugation electromagnetism Transmit-Receive Unit is sent combining by some conjugation electromagnetism to common geometric center, described conjugation electromagnetism sends referring to: in two identical coil core of geometric configuration, be wound with coil respectively, the canoe of coil is identical, electric current access polarity in coil is contrary, the direction of current one in two coils is made to be clockwise, another is counterclockwise, described conjugation electromagnetism sends also can being be wound with coil respectively in two identical coil core of geometric configuration, the canoe of coil is completely contrary, polarity is identical makes the direction of current one in two coils be clockwise in electric current access in coil, another is counterclockwise, coil core can be that the material that iron or the magnetic permeability such as iron nickel or siliconized plate are higher is made, according to Ampère law, if there is no other Magnetic Field Source, as long as the size of current that above-mentioned conjugation electromagnetism sends in two right coils is identical, so at the geometric center place of two coils, magnetic field intensity is zero, in the geometric center face of two coils and the neighborhood in geometric center face, magnetic field is more weak, if there is other Magnetic Field Source in space, so sent the electric current in two coils by adjustment conjugation electromagnetism, can make at the electromagnetism intensity at their geometric center place is zero, now, in the geometric center face of two coils and the neighborhood in geometric center face, magnetic field is more weak.
5. according to claim 3ly it is characterized in that the directed magnetic receiving array of conjugation electromagnetism Transmit-Receive Unit based on conjugation electromagnetism transmitting-receiving array wideband detection and visual display safe examination system, comprise multiple directed magnetic receiving element,
The directed magnetic receiving element of described directed magnetic receiving array, for receiving magnetic signal and being converted to electric signal, it is characterized in that being combined by multiple magnetic induction part and a metal magnetic field shielding case, magnetic induction part can be magneto sensor or coil or other magnetic induction part, multiple magnetic induction part composition omnidirectionals magnetic field receiving element, directive magnetic vector in space can be obtained, if adopt three magneto-dependent sensors, then three magneto-dependent sensors need to place in space on mutually perpendicular three directions, directive magnetic vector in space can be received to make the magnetic field receiving element formed, a metal magnetic field shielding case is added in certain face of above-mentioned omnidirectional magnetic field receiving element, make the magnetic field conductively-closed in certain direction, and the magnetic field coming from other directions beyond radome can only be received, obtain directed magnetic receiving element, in actual applications, the metallic shield of directed magnetic receiving element should be placed on the side away from detecting target, in such as detector gate system, the metallic shield of directed magnetic receiving element should be placed on the side of close frame outdoors,
According to practical application request, the magnetic signal multiple directed magnetic receiving element being arranged in above-mentioned conjugation electromagnetism transmitting element is the position of zero or more weak, if it is right that conjugation electromagnetism transmitting element only comprises a pair conjugation electromagnetism transmission, so directed magnetic receiving element is placed on conjugation electromagnetism and sends right geometric center place, in addition, can arrange that several directed magnetic receiving elements send right geometric center face at conjugation electromagnetism, arrange that a small amount of directed magnetic receiving element sends the neighborhood to geometric center face at conjugation electromagnetism, if it is right that the conjugation electromagnetism that conjugation electromagnetism transmitting element comprises multipair geometric center altogether sends, so directed magnetic receiving element is placed on conjugation electromagnetism and sends right geometric center place, the geometric center lines of several directed magnetic receiving elements at conjugation electromagnetism transmitting element can be arranged, arrange the neighborhood of a small amount of directed magnetic receiving element in the geometric center lines of conjugation electromagnetism transmitting element, above-mentioned directed magnetic receiving element is fixed by support, the material of support should be the non-metallic material not affecting magnetic field.
6. according to claim 1 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that safety check detection front end comprises the transmitting-receiving of conjugation electromagnetism array, image collecting device, data transmission module, data processing module and current control module, data transmission module is connected with data processing module, data processing module is connected with current control module, and current control module receives and dispatches array with conjugation electromagnetism, image collecting device is connected
The image collecting device of safety check detection front end is for gathering the image of detected target, namely be camera, camera should be arranged on bracing frame can photograph detected target overall picture position on, the top of such as detector gate, the overall picture of personnel by detector gate and article can be photographed
The conjugation electromagnetism transmitting-receiving array of safety check detection front end is for sending wideband detectable signal, receiving magnetic signal and be converted to electric signal, the magnetic signal of conjugation electromagnetism transmitting-receiving received by array may be the interference magnetic signal that in space exploration, other Magnetic Field Source sends, also may be the induced magnetism signal excited by detected metallic conductor, after reception, be converted to electric signal, be called magnetoelectricity signal
The data transmission module of safety check detection front end is used for and the mutual of data is carried out on data processing backstage, and its data transmission technology adopted is existing wired or wireless data transmission technology,
The data processing module of safety check detection front end comprises data processing unit and data storage cell, data storage cell for store wideband detectable signal and current amplitude control signal, conjugation electromagnetism transmitting-receiving array received to signal and the picture signal that arrives of image acquisition device, data processing unit is then for controlling the modules of safety check detection front end, produce wideband detectable signal and current amplitude control signal and carry out some pre-service to the received signal, such as filtering, denoising, amplification
The current control module of safety check detection front end comprises A/D converter, D/A converter and current control circuit, the digital signal that D/A converter is used for data processing unit exports is converted to simulating signal, this analog passband signal excess current control circuit generation current afterwards, be input in the coil of each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array, conjugation electromagnetism transmitting-receiving array received to magnetic signal and the picture signal that receives of image collecting device after A/D conversion, be input to the data processing module of safety check detection front end, filtering is carried out by the data processing unit of data processing module, denoising, after amplifying process, give data transmission blocks and send to data processing backstage.
7. according to claim 1 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system, it is characterized in that data processing backstage comprises data transmission module, data processing module and human-computer interaction module, described human-computer interaction module is connected with data processing module, data processing module is connected with data transmission module again
The human-computer interaction module on described data processing backstage comprises the input-output device such as keyboard, display screen, the parameter of wideband detectable signal is set for system user and checks result of detection, the parameter that can arrange comprises the duration of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal
The data processing module on described data processing backstage comprises data processing unit and data storage cell, data processing unit is used for control data process backstage modules, to receive come from the safety check detection magnetoelectricity signal of front end and image acquisition device to picture signal process: the position comprising the metallic conductor that the profile that extracts image and inverting detect, attribute and size information, and output to human-computer interaction module and show, data storage cell is then for storing wideband detectable signal, current amplitude control signal, the information stored is needed in the induced magnetism electric signal received and image information and some other process,
The data transmission module on described data processing backstage is used for detecting front end with safety check and carries out the mutual of data, and its data transmission technology used should be detect the corresponding wireless or wired data transmission technology of the data transmission module of front end with safety check.
8., based on the wideband detection of conjugation electromagnetism transmitting-receiving array and a visual display safety inspection method, it is characterized in that system work process comprises magnetic field pre-calibration process and detection process.
9. according to claim 8 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safety inspection method, it is characterized in that described magnetic field pre-calibration process is when each safe examination system start runs or testing environment changes, detect magnetic signal that some other Magnetic Field Source beyond target sends interference is produced to directed magnetic receiving element and the pre-calibration process that carries out to reject space exploration, before system starts detection, namely the detection of a target is not being had through safe examination system, conjugation electromagnetism in adjustment conjugation electromagnetism transmitting element sends the size of current in coil, the magnetic field intensity being positioned at the directed magnetic receiving element at geometric center place in each conjugation electromagnetism Transmit-Receive Unit is made to be zero, or lower than the threshold value preset, the step of described magnetic field pre-calibration process comprises:
Step 1. system user is by the parameter of the human-computer interaction module input wideband detectable signal on data processing backstage, parameter comprises the duration etc. of the mode of frequency regulation of wideband detectable signal, initial frequency, cutoff frequency, frequency modulation rate and signal, the data transmission module of this parameter through data processing backstage sends to safety check to detect front end
Step 2. safety check detection front end receiver wideband detectable signal parameter, and produce wideband detectable signal, in safety check detection front end, after data transmission module receives the parameter of wideband detectable signal, be input to data processing module, produce wideband detectable signal and current amplitude control signal at the data processing module of safety check detection front end, and be stored in data storage cell
Step 3. safety check detection front end sends wideband detection magnetic signal, the data processing module of safety check detection front end exports wideband detectable signal and current amplitude control signal to current control module, in current control module after D/A conversion, produce corresponding electric current at current control circuit to be input in the coil of each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array
The directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position of step 4. safety check detection front end receives interference magnetic signal, each directed magnetic receiving element being arranged in conjugation electromagnetism transmitting element geometric center place in conjugation electromagnetism transmitting-receiving array receives interference magnetic signal, and be converted to electric signal, obtain interference magnetoelectricity signal, and carry out A/D conversion in the current control module of safety check detection front end after, be input to the data processing module of safety check detection front end
The data processing module adjustment current amplitude control signal of step 5. safety check detection front end, the data processing module of safety check detection front end carries out filtering to the interference magnetoelectricity signal received, denoising, after amplifying pre-service, data processing module judges whether the interference magnetoelectricity signal that each the directed magnetic receiving element being positioned at conjugation electromagnetism transmitting element geometric center position receives is zero, if be zero, then do not need adjustment current amplitude control signal, enter step 6, also can set according to actual needs one close to zero threshold value, judge whether the interference magnetic signal received is less than this threshold value, if be less than, then think that interference can be ignored, do not need readjust current amplitude control signal, enter step 6, if non-vanishing or be not less than the threshold value of setting, then illustrate in space have other Magnetic Field Source, therefore data processing module adjustment current amplitude control signal, the interference magnetic signal that the directed magnetic receiving element making each be positioned at conjugation electromagnetism transmitting element geometric center position receives is zero or is less than the threshold value of setting, store new current amplitude control signal, enter step 3,
Current amplitude control signal after adjustment is given data transmission module and is sent to data processing backstage by step 6. safety check detection front end, the data processing module being input to data processing backstage after the data transmission module reception on data processing backstage stores, and pre-calibration process terminates.
10. according to claim 8 based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safety inspection method, it is characterized in that the detection process based on the wideband detection of conjugation electromagnetism transmitting-receiving array and visual display safe examination system and method comprises following steps:
Step 1. safety check detection front end sends wideband detection magnetic signal, the data processing unit of safety check detection front end reads the wideband detectable signal and current amplitude control signal that store in the data store, and carry out after D/A conversion through current control module, the coil that corresponding electric current is input to each conjugation electromagnetism transmitting element in conjugation electromagnetism transmitting-receiving array is produced at current control circuit
Step 2. safety check detection front end receiver detection magnetic signal and collection image information, each directed magnetic receiving element in conjugation electromagnetism transmitting-receiving array receives magnetic signal and is converted to electric signal, i.e. magnetoelectricity signal; Image acquisition device is detected the picture signal of target, by magnetoelectricity signal and picture signal after data processing module carries out the pre-service such as denoising, amplification, sends to data processing backstage by the data transmission module of safety check detection front end,
Step 3. data processing backstage receives magnetoelectricity signal and picture signal, after the data transmission module on data processing backstage receives magnetoelectricity signal and picture signal, is input to the data processing module on data processing backstage,
Step 4. data processing background process magnetoelectricity signal and picture signal, at the data processing module on data processing backstage, the intensity of the signal received according to each directed magnetic receiving element of the magnetoelectricity signal analysis received and direction, be finally inversed by the information such as the position at metallic conductor place, attribute and size, simultaneously, data processing module carries out profile parameters analysis to picture signal, extracts the profile of detected target
Step 5. data processing backstage display result of detection, at human-computer interaction module, simultaneously with the position of the profile of different colours display detected target and metal, attribute and size.
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Application publication date: 20151028 |