CN104346857A - Magnetic imaging method and device - Google Patents
Magnetic imaging method and device Download PDFInfo
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- CN104346857A CN104346857A CN201310334530.5A CN201310334530A CN104346857A CN 104346857 A CN104346857 A CN 104346857A CN 201310334530 A CN201310334530 A CN 201310334530A CN 104346857 A CN104346857 A CN 104346857A
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Abstract
The invention provides a magnetic imaging method used for obtaining a magnetic image of a detected medium in which magnetic identifications are arranged. The method includes the following steps: providing a magnetic sensor with a plurality of output channels; using the magnetic sensor to scan the detected medium so as to obtain output voltage signals output by the plurality of output channels at each time; and according to the voltage signals, obtaining the magnetic image of the detected medium. The magnetic imaging method is capable of reducing a probability of error erroneous judgment and misjudgment so that the authenticity identification precision is improved. The invention also provides a magnetic imaging device.
Description
Technical field
The invention belongs to field of precision measurement, be specifically related to a kind of magnetic imaging method and device.
Background technology
At present, the anti-counterfeiting technology being applied to banknote mainly contains the anti-counterfeiting technologies such as magnetic, fluorescence, watermark, relief printing plate, and cash inspecting machine distinguishes the true and false of banknote by Cleaning Principle corresponding with it for different anti-counterfeiting technologies.But offender's simulation capacity improves constantly in recent years, force anti-counterfeiting technology to be constantly updated, meanwhile, higher requirement is also proposed to the resolving ability of counterfeit money.
For magnetic anti-counterfeit technology, traditional method arranges magnetic anti-counterfeit mark, and cash inspecting machine is by identifying whether banknote relevant position is magnetic mark, namely determines whether magnetic, identifies the true and false of banknote.The method of this identification authenticity of banknotes occurs that the probability of misjudgement and erroneous judgement is very large, causes false distinguishing low precision.
Summary of the invention
The technical problem to be solved in the present invention is exactly the above-mentioned defect for existing in magnetic anti-counterfeit technology, provides a kind of magnetic imaging method and device, and it can reduce the probability of misjudgement and erroneous judgement, thus improves the precision of false distinguishing.
For this reason, the invention provides a kind of magnetic imaging method, comprising: for obtaining in it magnetic image of the detected medium being provided with magnetic mark, comprising:
The Magnetic Sensor with multiple output channel is provided;
Utilize described Magnetic Sensor to scan described detected medium, obtain the output voltage signal that described in each moment, multiple output channel exports;
The magnetic image of described detected medium is obtained according to described voltage signal.
Wherein, described Magnetic Sensor comprises multiple detecting unit, described multiple detecting unit is arranged along the detection width direction of described Magnetic Sensor, and total effectively detection width of described multiple detecting unit covers the detection width of described Magnetic Sensor completely, the corresponding described output channel of each described detecting unit.
Wherein, in the step of the detected medium of described Magnetic Sensor scanning, described Magnetic Sensor to be lined by line scan described detected medium with constant speed or constant acceleration.
Wherein, comprise according to the magnetic image step of the described detected medium of described voltage signal acquisition:
Described voltage signal is amplified the voltage signal obtaining and amplify;
The voltage signal of described amplification is converted to digital signal;
Arranging coordinate system, take sweep time as the longitudinal axis, and the sweep length of described Magnetic Sensor is transverse axis; Or take sweep time as transverse axis, the sweep length of described Magnetic Sensor is the longitudinal axis;
Magnetic image is obtained at described coordinate system according to the described digital signal that each moment is corresponding.
Wherein, obtaining according to described voltage signal in the magnetic image step of described detected medium, obtaining the gray scale magnetic image of described detected medium according to the power of described voltage signal.
The present invention also provides a kind of magnetic imaging device, for obtaining in it magnetic image of the detected medium being provided with magnetic mark, comprising:
Magnetic Sensor, it comprises multiple detecting units that the detection width direction along described Magnetic Sensor is arranged, and total effectively detection width of described multiple detecting unit covers the detection width of described Magnetic Sensor completely, the corresponding described output channel of each described detecting unit;
Signal gathering unit, in the process of the described detected medium of described Magnetic Sensor scanning, obtains the voltage signal that described in each moment, multiple detecting unit exports;
Processor, for obtaining the magnetic image of described detected medium according to described voltage signal.
Wherein, described detecting unit is the Wheatstone bridge be made up of magnetic induction film, and described magnetic induction film is giant magnetoresistance film, Hall effect film, anisotropic magnetoresistive film or tunnel effect magnetoresistive film.
Wherein, the quantity of described detecting unit is determined according to the resolution of magnetic imaging device.
Wherein, also comprising driver element, for driving described Magnetic Sensor or described detected medium motion, scanning described detected medium to make described Magnetic Sensor.
Wherein, described driver element makes described Magnetic Sensor line by line scan described detected medium with constant speed or constant acceleration.
Wherein, described signal gathering unit comprises:
Operational amplifier, for amplifying the voltage signal of described sensor output to obtain the voltage signal amplified;
Digital to analog converter, for being converted to digital signal by the voltage signal of described amplification;
Described processor take sweep time as the longitudinal axis, and the sweep length of described Magnetic Sensor is transverse axis, or take sweep time as transverse axis, the sweep length of described Magnetic Sensor is the longitudinal axis, obtains magnetic image according to the described digital signal that each moment is corresponding at described coordinate system.
Wherein, also comprise:
Power supply unit, for providing electric energy to described magnetic imaging device;
Display unit, is connected with described processor, for showing described magnetic image;
Manipulation unit, for manipulating described magnetic imaging device, to realize human computer interaction.
Wherein, described processor obtains the gray scale magnetic image of described detected medium according to the power of described voltage signal.
The present invention has following beneficial effect:
Magnetic imaging method provided by the invention, utilize the described detected medium of Magnetic Sensor scanning being provided with multiple output channel, obtain the voltage signal that described in each moment, multiple output channel exports, then the magnetic image of described detected medium is obtained according to described voltage signal, the true and false of detected medium can be distinguished intuitively by magnetic image, thus reduce the probability of misjudgement and erroneous judgement, thus improve the precision of false distinguishing.
Magnetic imaging device provided by the invention, by the detected medium of Magnetic Sensor scanning, the voltage signal of acquisition is transferred to signal gathering unit, voltage signal is converted to the signal that processor accepts by signal gathering unit, processor is detected the magnetic image of medium according to this signal acquisition, the true and false of detected medium can be distinguished by magnetic image intuitively, reduce the probability of misjudgement and erroneous judgement, thus improve the precision of false distinguishing.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present embodiment magnetic imaging device;
Fig. 2 is the process flow diagram of the present embodiment magnetic imaging method;
Fig. 3 is the particular flow sheet of step S3 in the present embodiment magnetic imaging method;
Fig. 4 a is the schematic diagram that transversal scanning is detected medium;
Fig. 4 b is the schematic diagram that longitudinal scanning is detected medium.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, magnetic imaging method provided by the invention and device are described in detail.
The magnetic imaging device of following embodiment introduction for detecting detected medium (as banknote or check etc.), to distinguish the true and false of detected medium.One of the magnetic mark that diverse location in detected medium is provided with shape, varies in size, magnetic mark has strong magnetic to identify, and also has weak magnetic to identify, or both being only provided with.Namely magnetic imaging device is that the magnetic signal identified by magnetic is obtained magnetic intuitively and is identified at position in detected medium, arranges shape and the size of magnetic mark.
Fig. 1 is the theory diagram of embodiment of the present invention magnetic imaging device.As shown in Figure 1, magnetic imaging device comprises Magnetic Sensor 1, signal gathering unit 2 and processor 3.
Wherein, Magnetic Sensor 1 for detecting the magnetic signal in detected medium, the output voltage signal when magnetic signal being detected.Particularly, Magnetic Sensor 1 comprises multiple detecting unit 11, and the corresponding output channel of each detecting unit 11, the quantity of detecting unit 11 is determined according to the resolution of magnetic imaging device, and resolution is higher, requires that the quantity of detecting unit 11 is more.Multiple detecting unit 11 is arranged along the detection width direction of Magnetic Sensor, and total effectively detection width of multiple detecting unit 11 covers the detection width of Magnetic Sensor completely, there is not blind area to make Magnetic Sensor 1 in the detection width of magnetic imaging device.When designing Magnetic Sensor, multiple detecting unit 11 can be shifted to install, with the detection width making detecting unit 11 cover Magnetic Sensor.The each detecting unit 11 of the present embodiment is all the Wheatstone bridges be made up of magnetic induction film, and as Hui Sitong half-bridge and Hui Sitong full-bridge, magnetic induction film can be giant magnetoresistance film, Hall effect film, anisotropic magnetoresistive film or tunnel effect magnetoresistive film.Effective detection width of detecting unit 11 is the length of magnetic induction film.
Signal gathering unit 2, for scanning in the process of detected medium at Magnetic Sensor 1, obtaining the voltage signal that each moment detecting unit 11 exports, and voltage signal is delivered to processor 3.
In the present embodiment, signal gathering unit 2 comprises operational amplifier 21 and digital to analog converter 22, wherein, operational amplifier 21 is for amplifying the voltage signal of described sensor output to obtain amplifying signal, digital to analog converter 22, for described amplifying signal is converted to digital signal, is beneficial to processor 3 and receives process.
Processor 3 is for obtaining the magnetic image of detected medium according to voltage signal.Processor 3 take sweep time as the longitudinal axis, with the sweep length of Magnetic Sensor 1 for transverse axis, or, take sweep time as transverse axis, with the sweep length of Magnetic Sensor 1 for the longitudinal axis, and simulate acquisition magnetic image in a coordinate system according to the digital signal that each moment is corresponding.Processor 3 obtains voltage signal according to Magnetic Sensor 1, particularly, according to the digital signal that signal gathering unit obtains, will have the region of magnetic signal " 1 " mark, without region " 0 " mark of magnetic signal, to obtain the magnetic image be made up of " 1 " and " 0 "; Or, have the region of magnetic signal "+" mark, without region "-" mark of magnetic signal, to obtain the magnetic image that "+" and "-" is formed.Certainly, processor 3 also can adopt other pattern identification to have magnetic area and without magnetic area.
In another embodiment, processor 3 obtains the gray scale magnetic image of detected medium according to the presence or absence of voltage signal and power, and namely according to the large young pathbreaker of voltage signal, it is divided into multiple grade to processor 3, represents by the color of different depth, thus obtains gray scale magnetic image.So not only can observe size and shape that magnetic is identified at position in detected medium and magnetic mark, the magnetic field can also observing magnetic mark is strong and weak, thus more effectively distinguishes the true and false of detected medium.
Magnetic imaging device also comprises power supply unit 4, display unit 5, manipulation unit 6 and driver element (not shown).Wherein, power supply unit 4 is for providing electric energy to magnetic imaging device.Display unit 5 is connected with processor 3, and for the magnetic image that video-stream processor 3 obtains, operator can from display unit 5 intuitively to the position of magnetic mark in detected medium, even shape and size.Manipulate unit 6 for manipulating magnetic imaging device, to realize human computer interaction.Driver element, for driving Magnetic Sensor 1 or detected medium motion, scans detected medium to make Magnetic Sensor 1.During use, magnetic imaging device is lined by line scan detected medium, and preferred Magnetic Sensor 1 to be lined by line scan detected medium with constant speed or constant acceleration.Signal gathering unit obtains voltage signal according to the frequency collection Magnetic Sensor of setting.
The magnetic imaging device that the present embodiment provides is by the detected medium of Magnetic Sensor scanning, the voltage signal of acquisition is transferred to signal gathering unit, voltage signal is converted to the signal that processor accepts by signal gathering unit, processor is detected the magnetic image of medium according to this signal acquisition, the true and false of detected medium can be distinguished intuitively by magnetic image, thus reduce the probability of misjudgement and erroneous judgement, thus improve the precision of false distinguishing.。
The present embodiment also provides a kind of magnetic imaging method, comprises the following steps:
Step S1, provides the Magnetic Sensor with multiple output channel.
As shown in Figure 1, Magnetic Sensor 1 comprises multiple detecting unit 11, and the corresponding output channel of each detecting unit 11, the quantity of detecting unit 11 is determined according to the resolution of magnetic imaging device, and resolution is higher, requires that the quantity of detecting unit 11 is more.Multiple detecting unit 11 is arranged along the detection width direction of Magnetic Sensor, and total effectively detection width of multiple detecting unit 11 covers the detection width of Magnetic Sensor completely, there is not blind area to make Magnetic Sensor 1 in the detection width of magnetic imaging device.In the present embodiment, multiple detecting unit 11 shifts to install by Magnetic Sensor, with the detection width making detecting unit 11 cover Magnetic Sensor.The each detecting unit 11 of the present embodiment is all the Wheatstone bridges be made up of magnetic induction film, and as Hui Sitong half-bridge and Hui Sitong full-bridge, magnetic induction film can be giant magnetoresistance film, Hall effect film, anisotropic magnetoresistive film or tunnel magnetoresistive film.
Step S2, utilizes Magnetic Sensor to scan described detected medium, obtains the output voltage signal that described in each moment, multiple output channel exports.
In step s 2, preferred Magnetic Sensor 1 to be lined by line scan detected medium with constant speed or constant acceleration, is so not only conducive to controlling magnetic imaging device, and is conducive to magnetic imaging.
Step S3, obtains the magnetic image of described detected medium according to described voltage signal.
As shown in Figure 3, step S3 comprises the following steps:
Step S31, amplifies voltage signal and obtains amplifying signal;
The voltage signal that Magnetic Sensor is exported by operational amplifier by the present embodiment amplifies, and obtains the voltage signal amplified.
Step S32, is converted to digital signal by the voltage signal of amplification.
The voltage signal of amplification is converted to digital signal by digital to analog converter by the present embodiment, so that processor receives.
Step S33, arranges coordinate system.
In step S33, processor for transverse axis, is that the longitudinal axis sets up coordinate system with the sweep length of Magnetic Sensor with sweep time.Or take sweep time as transverse axis, the sweep length of described Magnetic Sensor is that the longitudinal axis sets up coordinate system.
Step S34, the digital signal corresponding to each moment obtains magnetic image at coordinate system.
In step S34, the digital signal of processor corresponding to each moment obtains magnetic image at coordinate system.Processor will have the region of magnetic signal " 1 " mark, without region " 0 " mark of magnetic signal, to obtain the magnetic image be made up of " 1 " and " 0 "; Or, have the region of magnetic signal "+" mark, without region "-" mark of magnetic signal, to obtain the magnetic image that "+" and "-" is formed.Certainly, processor also can adopt other mark differentiation to have magnetic area and without magnetic area.
The magnetic imaging method that the present embodiment provides obtains the magnetic image of detected medium, namely size and shape that magnetic is identified at position in detected medium and magnetic mark can be observed, the true and false of detected medium can be distinguished intuitively by magnetic image, thus reduce the probability of misjudgement and erroneous judgement, thus improve the precision of false distinguishing.
The voltage signal that Magnetic Sensor obtains is directly proportional to the magnetic field power that magnetic identifies, and processor is according to the power in the size identification magnetic field of voltage signal.Accordingly, in a preferred embodiment, step S34 obtains the gray scale magnetic image of detected medium according to the size of voltage signal, and namely according to the large young pathbreaker of voltage signal, it is divided into multiple grade to processor 3, represents by the color of different depth, thus obtains gray scale magnetic image.This method not only can observe size and the shape that magnetic is identified at position in detected medium and magnetic mark, and the magnetic field can also observing magnetic mark is strong and weak, thus more effectively distinguishes the true and false of detected medium.
It should be noted that, above-described embodiment magnetic imaging device and method transversal scanning can be detected medium, as shown in fig. 4 a, and the direction of arrow logo Magnetic Sensor scanning banknote; Also can be detected medium by longitudinal scanning, as shown in Figure 4 b, arrow represents the direction of Magnetic Sensor scanning banknote.
The magnetic imaging method that above-described embodiment provides, utilize the described detected medium of Magnetic Sensor scanning being provided with multiple output channel, obtain the voltage signal that described in each moment, multiple output channel exports, then obtain the magnetic image of described detected medium according to described voltage signal, the true and false of detected medium can be distinguished by magnetic image intuitively.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (13)
1. a magnetic imaging method, for obtaining in it magnetic image of the detected medium being provided with magnetic mark, is characterized in that, comprise:
The Magnetic Sensor with multiple output channel is provided;
Utilize described Magnetic Sensor to scan described detected medium, obtain the output voltage signal that described in each moment, multiple output channel exports;
The magnetic image of described detected medium is obtained according to described voltage signal.
2. magnetic imaging method according to claim 1, it is characterized in that, described Magnetic Sensor comprises multiple detecting unit, described multiple detecting unit is arranged along the detection width direction of described Magnetic Sensor, and total effectively detection width of described multiple detecting unit covers the detection width of described Magnetic Sensor completely, the corresponding described output channel of each described detecting unit.
3. magnetic imaging method according to claim 1, is characterized in that, in the step of the detected medium of described Magnetic Sensor scanning, described Magnetic Sensor to be lined by line scan described detected medium with constant speed or constant acceleration.
4. magnetic imaging method according to claim 1, is characterized in that, the magnetic image step obtaining described detected medium according to described voltage signal comprises:
Described voltage signal is amplified the voltage signal obtaining and amplify;
The voltage signal of described amplification is converted to digital signal;
Arranging coordinate system, take sweep time as the longitudinal axis, and the sweep length of described Magnetic Sensor is transverse axis; Or take sweep time as transverse axis, the sweep length of described Magnetic Sensor is the longitudinal axis;
Magnetic image is obtained at described coordinate system according to the described digital signal that each moment is corresponding.
5. magnetic imaging method according to claim 1, is characterized in that, is obtaining in the magnetic image step of described detected medium, obtain the gray scale magnetic image of described detected medium according to the power of described voltage signal according to described voltage signal.
6. a magnetic imaging device, for obtaining in it magnetic image of the detected medium being provided with magnetic mark, is characterized in that, comprise:
Magnetic Sensor, it comprises multiple detecting units that the detection width direction along described Magnetic Sensor is arranged, and total effectively detection width of described multiple detecting unit covers the detection width of described Magnetic Sensor completely, the corresponding described output channel of each described detecting unit;
Signal gathering unit, in the process of the described detected medium of described Magnetic Sensor scanning, obtains the voltage signal that described in each moment, multiple detecting unit exports;
Processor, for obtaining the magnetic image of described detected medium according to described voltage signal.
7. magnetic imaging device according to claim 6, is characterized in that, described detecting unit is the Wheatstone bridge be made up of magnetic induction film, and described magnetic induction film is giant magnetoresistance film, Hall effect film, anisotropic magnetoresistive film or tunnel effect magnetoresistive film.
8. magnetic imaging device according to claim 7, is characterized in that, the quantity of described detecting unit is determined according to the resolution of magnetic imaging device.
9. magnetic imaging device according to claim 6, is characterized in that, also comprise driver element, for driving described Magnetic Sensor or described detected medium motion, scans described detected medium to make described Magnetic Sensor.
10. magnetic imaging device according to claim 9, is characterized in that, described driver element makes described Magnetic Sensor line by line scan described detected medium with constant speed or constant acceleration.
11. magnetic imaging devices according to claim 9, it is characterized in that, described signal gathering unit comprises:
Operational amplifier, for amplifying the voltage signal of described sensor output to obtain the voltage signal amplified;
Digital to analog converter, for being converted to digital signal by the voltage signal of described amplification;
Described processor take sweep time as the longitudinal axis, and the sweep length of described Magnetic Sensor is transverse axis, or take sweep time as transverse axis, the sweep length of described Magnetic Sensor is the longitudinal axis, obtains magnetic image according to the described digital signal that each moment is corresponding at described coordinate system.
12. magnetic imaging devices according to claim 11, is characterized in that, also comprise:
Power supply unit, for providing electric energy to described magnetic imaging device;
Display unit, is connected with described processor, for showing described magnetic image;
Manipulation unit, for manipulating described magnetic imaging device, to realize human computer interaction.
13. magnetic imaging devices according to claim 12, is characterized in that, described processor obtains the gray scale magnetic image of described detected medium according to the power of described voltage signal.
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