CN105403922A - Weak magnetic detection method - Google Patents
Weak magnetic detection method Download PDFInfo
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- CN105403922A CN105403922A CN201510958242.6A CN201510958242A CN105403922A CN 105403922 A CN105403922 A CN 105403922A CN 201510958242 A CN201510958242 A CN 201510958242A CN 105403922 A CN105403922 A CN 105403922A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
Abstract
The invention belongs to the technical field of article detection and specifically relates to a weak magnetic detection method which carries out detection by taking a weak magnetic field feature of a detected object as a basis. According to the technical scheme provided by the invention, the detected object can be distinguished according to concrete types comprising a human type, an eyeglass ornament type, a communication recording equipment type such as mobile phone earphones and the like, a key watch type, a controlled knife type and other types. Products further developed based on a basic principle of the method include yet are not confined to mobile phone detection doors, radiation-free metal safety check doors, package detectors, metal lossless flow detection devices and the like. On the basis that the type of the detected object is distinguished by use of the magnetic field feature of the detected object, the purpose of relevant detection is realized, and the rate of false alarm is substantially reduced.
Description
Technical field
The invention belongs to Articles detecting technical field, be specifically related to a kind of weak magnetic detection method, it detects based on the faint magnetic signature of measured object.
Background technology
Ferromagnetic object can be magnetized in terrestrial magnetic field, and the object be magnetized can produce disturbance to surrounding magnetic field.The permanent magnet of small volume or the electronic product being connected with weak current also can produce magnetic field within the scope of certain space.In measured object size, under the condition of shape and Location-Unknown, the magnetic field intensity only by space point cannot simply judge the attribute of measured object.And when measured object and Magnetic Sensor generation relative motion, namely measured object is detected in the Distribution of Magnetic Field situation in space and records, just can determine the magnetic intensity of measured object through appropriate determination methods, size, shape and positional information.
Patent CN104457746A discloses a kind of weak magnetic detection and positioning system.For Underwater Battery antagonism, have that close-in target recognition capability is found by enemy by force, not easily, unique strong point such as low in energy consumption.Under the service condition of this patent, any have different magnetic signature to be all judged as hostile weapon with terrestrial magnetic field feature.In Articles detecting technical field, this patent cannot be utilized to analyze the magnetic intensity of measured object further, size, shape and positional information.
Patent CN204116622U discloses a kind of novel security inspection door.Use multiple fluxgate sensor, detect electronic product and the metal species article such as mobile phone, computer, wireless interface transmitting apparatus.This detector gate can detect ferromagnetic object, permanent magnetism object and alive equipment, but according to know-why and the method for this patent, can only to set out warning according to maximum magnetic field strength, but the size of measured object cannot be analyzed further, shape, the information such as position and magnetic field feature, thus, demand cannot be detected according to reality and distinguish the various object that there is Weak magentic-field.Namely there is the problems such as inevasible high rate of false alarm according to this know-why.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: detect based on magnetic signature as faint in how measured object, provides a kind of weak magnetic detection method.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of weak magnetic detection method, described weak magnetic detection method comprises the steps:
Step 1: multiple spot arranges many weak magnetic sensors, and make measured object and weak magnetic sensor produce relative motion; Described many weak magnetic sensors are that measurement characteristics is identical, measure the weak magnetic sensor that axis parallels;
Step 2: measure in the position of weak magnetic sensor distance measured object 15cm to 30cm, obtain multiple weak magnetic sensor reading;
Step 3: because earth magnetism fluctuation is the entirety fluctuation of internal magnetic field in a big way, in above-mentioned multiple weak magnetic sensor reading, after removing the weak magnetic sensor reading obviously affected by measured object, obtain the mean value of other weak magnetic sensor readings, this mean value is as the earth magnetism undulating quantity of sampling instant;
Step 4: the reading of whole weak magnetic sensor is all reduced this earth magnetism undulating quantity; Thus, the detection carrying out Weak magentic-field under earth magnetism fluctuation disturbed condition is realized;
Step 5: according to known changes of magnetic field rule, distinguishes the kind of measured object.
Wherein, described weak magnetic sensor is three axis fluxgate sensors, and resolution reaches or higher than 1nT.
Wherein, the relative movement of weak magnetic sensor and measured object generation particular track in detection process, the movement locus of measured object and each weak magnetic sensor axis perpendicular.
Wherein, measured object moves along the round line in a certain plane, and each weak magnetic sensor axis being parallel is in A plane, is arranged in A plane upper and lower.
Wherein, in step 5, described known changes of magnetic field rule is that the magnetic field of difform exemplary magnets is in the different characteristic different with directivity of spatial attenuation rule, comprise following rule: typical bar magnet has obvious directivity, the rectilinear direction that SN pole is linked to be decays slower with distance; Typical horseshoe magnet has obvious directivity, very fast with range attenuation in all directions; Typical ring-shaped magnet, not obvious in most of surrounding space directivity, other region decay near the rectilinear direction be linked to be except SN pole are very fast.
Wherein, in step 5, measured object and sensor relative motion, movement velocity is in a particular range, and described known changes of magnetic field rule comprises: it is faster that same sensor detects the change of magnetic field strength obtained, and illustrates that measured object magnetic field is faster with range attenuation; The time interval that the Magnetic Sensor magnetic field intensity peak value being positioned over measured object both sides occurs is larger, illustrates that magnetic direction is more obvious; Multiple sensor detection magnetic field in a big way in there is larger fluctuation simultaneously, in long period section, maintain larger magnetic field, illustrate that magnet volume is larger; Identical maximum magnetic field strength data, the magnetic field intensity of corresponding large volume magnet is less, and the magnetic field intensity of corresponding small size magnet is larger; The difference of the signal that the Magnetic Sensor being arranged in both sides detects is larger, illustrates that magnet positions is more partial to the larger side of probe value.
(3) beneficial effect
The communications such as measured object can be divided into specific category by technical solution of the present invention, includes, without being limited to: human body classification, glasses ornaments classification, handset earphone recording device class, key wrist-watch classification, controlled knife classification and other classifications.On the basic principle of the inventive method, the product further developed includes, without being limited to: mobile phone detection door, radiationless metal detector gate, parcel detection machine and metal nondestructiving inspecting equipment etc.The present invention, on the basis utilizing measured object magnetic signature differentiation measured object classification, reaches the object carrying out targetedly detecting, significantly reduces rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the weak magnetic detection method process flow diagram of the present invention.
Fig. 2 is three kinds of common Distribution of Magnetic Field figure.
Fig. 3 is for detecting inversion algorithm process flow diagram.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
For solving the problems of the technologies described above, the invention provides a kind of weak magnetic detection method, as shown in Figure 1, described weak magnetic detection method comprises the steps:
Step 1: multiple spot arranges many weak magnetic sensors, and make measured object and weak magnetic sensor produce relative motion; Described many weak magnetic sensors are that measurement characteristics is identical, measure the weak magnetic sensor that axis parallels;
Step 2: measure in the position of weak magnetic sensor distance measured object 15cm to 30cm, obtain multiple weak magnetic sensor reading;
Step 3: because earth magnetism fluctuation is the entirety fluctuation of internal magnetic field in a big way, in above-mentioned multiple weak magnetic sensor reading, after removing the weak magnetic sensor reading obviously affected by measured object, obtain the mean value of other weak magnetic sensor readings, this mean value is as the earth magnetism undulating quantity of sampling instant;
Step 4: the reading of whole weak magnetic sensor is all reduced this earth magnetism undulating quantity; Thus, the detection carrying out Weak magentic-field under earth magnetism fluctuation disturbed condition is realized;
Step 5: according to known changes of magnetic field rule, in conjunction with detection inversion algorithm, distinguishes the kind of measured object.
Wherein, described weak magnetic sensor is three axis fluxgate sensors, and resolution reaches or higher than 1nT.
Wherein, the relative movement of weak magnetic sensor and measured object generation particular track in detection process, the movement locus of measured object and each weak magnetic sensor axis perpendicular.
Wherein, measured object moves along the round line in a certain plane, and each weak magnetic sensor axis being parallel is in A plane, is arranged in A plane upper and lower.
Wherein, in step 5, described known changes of magnetic field rule is that the magnetic field of difform exemplary magnets is in the different characteristic different with directivity of spatial attenuation rule, comprise following rule: typical bar magnet has obvious directivity, the rectilinear direction that SN pole is linked to be decays slower with distance; Typical horseshoe magnet has obvious directivity, very fast with range attenuation in all directions; Typical ring-shaped magnet, not obvious in most of surrounding space directivity, other region decay near the rectilinear direction be linked to be except SN pole are very fast.
Wherein, in step 5, measured object and sensor relative motion, movement velocity is in a particular range, and described known changes of magnetic field rule comprises: it is faster that same sensor detects the change of magnetic field strength obtained, and illustrates that measured object magnetic field is faster with range attenuation; The time interval that the Magnetic Sensor magnetic field intensity peak value being positioned over measured object both sides occurs is larger, illustrates that magnetic direction is more obvious; Multiple sensor detection magnetic field in a big way in there is larger fluctuation simultaneously, in long period section, maintain larger magnetic field, illustrate that magnet volume is larger; Identical maximum magnetic field strength data, the magnetic field intensity of corresponding large volume magnet is less, and the magnetic field intensity of corresponding small size magnet is larger; The difference of the signal that the Magnetic Sensor being arranged in both sides detects is larger, illustrates that magnet positions is more partial to the larger side of probe value.
Wherein, in step 5, according to known Distribution of Magnetic Field rule, detect inversion algorithm in conjunction with three axis fluxgate sensors, measured object is divided into ferromagnetic object, permanent magnetism object and weak current equipment;
Described three axis fluxgate sensors detect inversion algorithm:
According to workplace background magnetic field compensation sensor parameter; Sensor records three, magnetic field to be measured quadrature component; Infrared emission opal transport pulse unblanking inversion algorithm; Three quadrature component blended space magnetic vectors; Discrete point fits to approximate magnetic curvature of field face to according to magnetic field reconstruction algorithm; Fuzzy algorithm finds the immediate determinand of magnetic curved surface distribution characteristics; Whether the magnetic signature rule of thumb described in the judgement of storehouse value is determinand; If not, then proceed to reset signal processing module and continue inversion algorithm; If so, then warning is generated.
Further above rule is tested, and sum up the experiment law under particular sensor layout type, carry out quantitative test.Measured object can be divided into specific category, include, without being limited to: human body classification, glasses ornaments classification, the communication recording device classes such as handset earphone, key wrist-watch classification, controlled knife classification and other classifications.
On the basic principle of the inventive method, the product further developed includes, without being limited to: mobile phone detection door, radiationless metal detector gate, parcel detection machine and metal nondestructiving inspecting equipment etc.
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment 1
The present embodiment provide a kind of can by analysis to magnetic field faint around measured object, difference ferromagnetic object, less permanent magnet and be connected with the method for electronic product of weak current.Further, to the magnetic signature of measured object, magnetic field intensity, size, the information such as shape and position judges, and has the testee of different magnetic field feature in order to difference.Particular flow sheet as indicated with 1.
For achieving the above object, the present invention adopts following technical scheme: comprise the weak magnetic sensor that multiple spot is arranged, and measured object and sensor produce relative motion.
When tested personnel passes through, if this carry ferromagnetic object, less permanent magnet or be connected with the electronic product of weak current, the weak magnetic sensor that so measured object can be arranged with multiple spot produces certain relative motion, and its movement locus generally comprises and is not limited to each sensor axis perpendicular.The weak magnetic sensor of each point is generally fluxgate sensor, is preferably three axis fluxgate sensors.When its resolution reach or higher than 1nT time, earth magnetism fluctuation impact just can not ignore.Adopt axis to parallel and many Magnetic Sensors perpendicular to ground detect, so earth magnetism fluctuation has just become the entirety fluctuation of internal magnetic field in a big way.In sensor reading, after removing the sensor obviously affected by measured object, obtain the mean value of other sensors, this mean value can roughly as the earth magnetism undulating quantity of sampling instant.All sensors reading all should reduce this earth magnetism undulating quantity.So just invariably can move the impact on sensor reading by magnetic wave.
In detection process, measured object and sensor relative motion, and movement velocity is in a particular range, the normal gait velocity range of such as people.According to certain changes of magnetic field rule and detection inversion algorithm, just measured object can be divided into ferromagnetic object, permanent magnetism object and weak current equipment.
These changes of magnetic field rules include, without being limited to: it is faster that same sensor detects the change of magnetic field strength obtained, and illustrate that measured object magnetic field is faster with range attenuation.The time interval that the Magnetic Sensor magnetic field intensity peak value being positioned over measured object both sides occurs is larger, illustrates that magnetic direction is more obvious.Multiple sensor detection magnetic field in a big way in there is larger fluctuation simultaneously, in long period section, maintain larger magnetic field, illustrate that magnet volume is larger.Identical maximum magnetic field strength data, the magnetic field intensity of corresponding large volume magnet is less, and the magnetic field intensity of corresponding small size magnet is larger.The difference of the signal that the Magnetic Sensor being arranged in both sides detects is larger, illustrates that magnet positions is more partial to the larger side of probe value.The typical magnetic field of the reality corresponding with it: as shown in Figure 2, typical bar magnet has obvious directivity, the rectilinear direction that SN pole is linked to be decays slower with distance; Typical horseshoe magnet has obvious directivity, very fast with range attenuation in all directions; Typical ring-shaped magnet, not obvious in most of surrounding space directivity, other region decay near the rectilinear direction be linked to be except SN pole are very fast.
Based on the changes of magnetic field rule that the above is known, in conjunction with certain detection inversion algorithm, as shown in Figure 3.Just measured object can be divided into ferromagnetic object, permanent magnetism object and weak current equipment.Further above rule is tested, and sum up the experiment law under particular sensor layout type, carry out quantitative test.Measured object can be divided into specific category, include, without being limited to: human body classification, glasses ornaments classification, the communication recording device classes such as handset earphone, key wrist-watch classification, controlled knife classification and other classifications.
The beneficial effect of the present embodiment is: utilizing measured object magnetic signature to distinguish on the basis of measured object classification, reaching the object carrying out targetedly detecting, significantly reducing rate of false alarm.
On the basic principle of the present embodiment method, the product further developed includes, without being limited to: mobile phone detection door, radiationless metal detector gate, parcel detection machine and metal nondestructiving inspecting equipment etc.
Embodiment 2
For the problems referred to above, the present embodiment provide a kind of can by analysis to magnetic field faint around measured object, difference ferromagnetic object, less permanent magnet and be connected with the method for electronic product of weak current.Further, to the magnetic signature of measured object, magnetic field intensity, size, the information such as shape and position judges, and has the testee of different magnetic field feature in order to difference.Process flow diagram as indicated with 1.
The present invention includes the weak magnetic sensor that multiple spot is arranged, and determinand and sensor produce relative motion.
Because environment for use of the present invention is generally by the space of earth magnetism influence of fluctuations, and the magnetic field intensity around measured object is with range attenuation, with general ferromagnetic object, less permanent magnet or the position measurement of electronic equipment distance 15cm to 30cm being connected with weak current, its magnetic field intensity is generally at tens to hundreds of nanotesla.And the undulating quantity of terrestrial magnetic field reached tens to tens nanoteslas in several seconds in General Spatial, thus, the present invention adopts many measurement characteristicses identical, and the Magnetic Sensor that measurement axis parallels detects.Due to, earth magnetism fluctuation is the entirety fluctuation of internal magnetic field in a big way, and with in above-mentioned Magnetic Sensor reading, after removing the sensor obviously affected by measured object, obtain the mean value of other sensors, this mean value can roughly as sampling instant, earth magnetism undulating quantity.All sensors reading all should reduce this earth magnetism undulating quantity.So, realize the detection carrying out Weak magentic-field under earth magnetism fluctuation disturbed condition.
Preferably, these sensors are three axis fluxgate sensors, and resolution reaches or higher than 1nT.
Further, the relative movement of sensor and measured object generation particular track in detection process.
Preferably, the movement locus of measured object and each sensor axis perpendicular.
As another kind of preferred version, measured object moves along the round line in A plane, and each sensor axis is parallel to A plane, is arranged in A plane upper and lower.
Further, present invention utilizes the magnetic field of difform exemplary magnets in the different characteristic different with directivity of spatial attenuation rule, include, without being limited to following rule, typical bar magnet has obvious directivity, the rectilinear direction that SN pole is linked to be decays slower with distance; Typical horseshoe magnet has obvious directivity, very fast with range attenuation in all directions; Typical ring-shaped magnet, not obvious in most of surrounding space directivity, other region decay near the rectilinear direction be linked to be except SN pole are very fast.
In detection process, measured object and sensor relative motion, movement velocity in a particular range, the normal gait velocity range of such as people.These rules include, without being limited to: it is faster that same sensor detects the change of magnetic field strength obtained, and illustrate that measured object magnetic field is faster with range attenuation.The time interval that the Magnetic Sensor magnetic field intensity peak value being positioned over measured object both sides occurs is larger, illustrates that magnetic direction is more obvious.Multiple sensor detection magnetic field in a big way in there is larger fluctuation simultaneously, in long period section, maintain larger magnetic field, illustrate that magnet volume is larger.Identical maximum magnetic field strength data, the magnetic field intensity of corresponding large volume magnet is less, and the magnetic field intensity of corresponding small size magnet is larger.The difference of the signal that the Magnetic Sensor being arranged in both sides detects is larger, illustrates that magnet positions is more partial to the larger side of probe value.
According to known Distribution of Magnetic Field rule, detect inversion algorithm in conjunction with three axis fluxgate sensors, as shown in Figure 3.Measured object can be divided into ferromagnetic object, permanent magnetism object and weak current equipment.Further above rule is tested, and sum up the experiment law under particular sensor layout type, carry out quantitative test.Measured object can be divided into specific category, include, without being limited to: human body classification, glasses ornaments classification, the communication recording device classes such as handset earphone, key wrist-watch classification, controlled knife classification and other classifications.
On the basic principle of the inventive method, the product further developed includes, without being limited to: mobile phone detection door, radiationless metal detector gate, parcel detection machine and metal nondestructiving inspecting equipment etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (6)
1. a weak magnetic detection method, is characterized in that, described weak magnetic detection method comprises the steps:
Step 1: multiple spot arranges many weak magnetic sensors, and make measured object and weak magnetic sensor produce relative motion; Described many weak magnetic sensors are that measurement characteristics is identical, measure the weak magnetic sensor that axis parallels;
Step 2: measure in the position of weak magnetic sensor distance measured object 15cm to 30cm, obtain multiple weak magnetic sensor reading;
Step 3: because earth magnetism fluctuation is the entirety fluctuation of internal magnetic field in a big way, in above-mentioned multiple weak magnetic sensor reading, after removing the weak magnetic sensor reading obviously affected by measured object, obtain the mean value of other weak magnetic sensor readings, this mean value is as the earth magnetism undulating quantity of sampling instant;
Step 4: the reading of whole weak magnetic sensor is all reduced this earth magnetism undulating quantity; Thus, the detection carrying out Weak magentic-field under earth magnetism fluctuation disturbed condition is realized;
Step 5: according to known changes of magnetic field rule, distinguishes the kind of measured object.
2. weak magnetic detection method as claimed in claim 1, is characterized in that, described weak magnetic sensor is three axis fluxgate sensors, and resolution reaches or higher than 1nT.
3. weak magnetic detection method as claimed in claim 1, is characterized in that, the relative movement of weak magnetic sensor and measured object generation particular track in detection process, the movement locus of measured object and each weak magnetic sensor axis perpendicular.
4. weak magnetic detection method as claimed in claim 1, is characterized in that, measured object moves along the round line in a certain plane, and each weak magnetic sensor axis being parallel is in A plane, is arranged in A plane upper and lower.
5. weak magnetic detection method as claimed in claim 1, it is characterized in that, in step 5, described known changes of magnetic field rule is that the magnetic field of difform exemplary magnets is in the different characteristic different with directivity of spatial attenuation rule, comprise following rule: typical bar magnet has obvious directivity, the rectilinear direction that SN pole is linked to be decays slower with distance; Typical horseshoe magnet has obvious directivity, very fast with range attenuation in all directions; Typical ring-shaped magnet, not obvious in most of surrounding space directivity, other region decay near the rectilinear direction be linked to be except SN pole are very fast.
6. weak magnetic detection method as claimed in claim 1, it is characterized in that, in step 5, measured object and sensor relative motion, movement velocity is in a particular range, described known changes of magnetic field rule comprises: it is faster that same sensor detects the change of magnetic field strength obtained, and illustrates that measured object magnetic field is faster with range attenuation; The time interval that the Magnetic Sensor magnetic field intensity peak value being positioned over measured object both sides occurs is larger, illustrates that magnetic direction is more obvious; Multiple sensor detection magnetic field in a big way in there is larger fluctuation simultaneously, in long period section, maintain larger magnetic field, illustrate that magnet volume is larger; Identical maximum magnetic field strength data, the magnetic field intensity of corresponding large volume magnet is less, and the magnetic field intensity of corresponding small size magnet is larger; The difference of the signal that the Magnetic Sensor being arranged in both sides detects is larger, illustrates that magnet positions is more partial to the larger side of probe value.
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| CN106772628A (en) * | 2016-12-28 | 2017-05-31 | 宁波市鄞州磁泰电子科技有限公司 | A kind of metal detecting device |
| CN107219557A (en) * | 2017-07-07 | 2017-09-29 | 湖南警察学院 | A kind of low-intensity magnetic field detection method and system |
| CN107643489A (en) * | 2016-07-22 | 2018-01-30 | 苏州宝时得电动工具有限公司 | Electrical energy storage device, electric tool and its control method |
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| CN110646852A (en) * | 2019-08-29 | 2020-01-03 | 中国地质大学（武汉） | Low-power-consumption security inspection detection system and method based on MEMS weak magnetic sensor array |
| CN111498066A (en) * | 2020-04-23 | 2020-08-07 | 大连海事大学 | Underwater weak magnetic signal collection robot and method for detecting target object by using same |
| CN114533033A (en) * | 2022-02-28 | 2022-05-27 | 深圳硅基智控科技有限公司 | Method and detection device for detecting foreign body in subject |
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| CN110646852B (en) * | 2019-08-29 | 2021-07-20 | 中国地质大学（武汉） | Low-power-consumption security inspection detection system and method based on MEMS weak magnetic sensor array |
| CN110646852A (en) * | 2019-08-29 | 2020-01-03 | 中国地质大学（武汉） | Low-power-consumption security inspection detection system and method based on MEMS weak magnetic sensor array |
| CN111498066A (en) * | 2020-04-23 | 2020-08-07 | 大连海事大学 | Underwater weak magnetic signal collection robot and method for detecting target object by using same |
| CN111498066B (en) * | 2020-04-23 | 2021-11-23 | 大连海事大学 | Underwater weak magnetic signal collection robot and method for detecting target object by using same |
| CN114533033A (en) * | 2022-02-28 | 2022-05-27 | 深圳硅基智控科技有限公司 | Method and detection device for detecting foreign body in subject |
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