CN103760225A - Pulse vortex sensor and non-destructive detecting system for deep space probe - Google Patents
Pulse vortex sensor and non-destructive detecting system for deep space probe Download PDFInfo
- Publication number
- CN103760225A CN103760225A CN201310713720.8A CN201310713720A CN103760225A CN 103760225 A CN103760225 A CN 103760225A CN 201310713720 A CN201310713720 A CN 201310713720A CN 103760225 A CN103760225 A CN 103760225A
- Authority
- CN
- China
- Prior art keywords
- deep space
- eddy current
- space probe
- signal
- current sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention provides a pulse vortex sensor and a non-destructive detecting system for a deep space probe. The vortex sensor comprises an excitation coil, a tunnel magnetoresistor array and a signal output end, wherein the excitation coil is used for providing a vortex magnetic field for a part to be detected of the deep space probe under the action of square wave pulse electric current; the tunnel magnetoresistor array is connected with the excitation coil in a matching manner and is used for detecting the variation condition of the vortex magnetic field before and after the deep space probe lands and generating corresponding reference signals and the damage signals; the signal output end is connected with the tunnel magnetoresistor array and is used for outputting the reference signals and the damage signals. The pulse vortex sensor provided by the invention has the advantages that the damage condition of the part to be detected can be analyzed by processing the reference signals and the damage signals, the non-destructive detection is performed on the deep space probe, and the support is provided for evaluating the on-orbit security of the probe.
Description
Technical field
The present invention relates to spationautics field, relate in particular to a kind of deep space probe impulse eddy current sensor, nondestructive detection system.
Background technology
Survey of deep space is the important directions of spationautics development, it is important way and the effective means of survey of deep space that deep space lands, during deep space probe landing celestial body surface, although detector has adopted various impact mitigation measures, but be subject to the impact of retro-rocket, touch-down zone topography and geomorphology and landing posture, lander support and detector connecting portion are easy to because of the stressed excessive damage that produces.At present, China not yet carries out the correlative study of Non-Destructive Testing in-orbit of deep space probe lander.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, using this as the preorder in greater detail of discussing after a while.
The invention provides a kind of deep space probe impulse eddy current sensor, comprising:
Field coil, provides eddy current magnetism for the position to be detected for deep space probe under the effect of square wave pulsed current;
Tunnel magnetoresistance array, is connected with described field coil, the situation of change of the eddy current magnetism for detection of deep space probe in the first state and the second state, and generate corresponding reference signal and damage signal;
Signal output part, is connected with described tunnel magnetoresistance array, for exporting described reference signal and damage signal.
The present invention also provides a kind of nondestructive detection system, comprises above-mentioned deep space probe impulse eddy current sensor, also comprises:
Impulse source, is connected with described field coil, is used to described field coil that square wave pulsed current is provided;
Signal processor, is connected with described signal output part, for described reference signal and described damage signal are carried out to respective handling acquisition changes in distribution signal, according to the degree of impairment at position to be detected described in changes in distribution signal analysis.
For deep space probe provided by the invention, impulse eddy current sensor, nondestructive detection system, can carry out Non-Destructive Testing to deep space probe, for detector in-orbit safety evaluation provide support.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the longitudinal sectional drawing of a kind of embodiment of deep space probe provided by the invention impulse eddy current sensor.
Fig. 2 is the transverse cross-sectional view of a kind of embodiment of deep space probe provided by the invention impulse eddy current sensor.
Fig. 3 is the structural representation of a kind of embodiment of nondestructive detection system provided by the invention.
Fig. 4 is the process flow diagram of a kind of embodiment of deep space probe lossless detection method provided by the invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.The element of describing in an accompanying drawing of the present invention or a kind of embodiment and feature can combine with element and feature shown in one or more other accompanying drawing or embodiment.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not paying creative work, belongs to the scope of protection of the invention.
Embodiment mono-
With reference to figure 1 and Fig. 2, the present embodiment provides a kind of deep space probe impulse eddy current sensor, it is characterized in that, comprising:
During detection, by impulse eddy current installation of sensors in the sensitive part of deep space probe, for example lander support and detector connecting portion, by detecting reference signal and the damage signal of the output of impulse eddy current sensor, and this reference signal and damage signal are processed accordingly, can obtain the degree of impairment at this position, simple in structure, reliability is high.
Preferably, field coil 101 comprises coil 104 and iron core 105, and coil 104 is wound on iron core 105.
For field coil 101 provides a square wave pulsed current, can produce eddy current magnetism at the position to be detected of deep space probe, because square-wave pulse has comprised abundant frequency content, can produce at position to be detected the magnetic field of different frequency, the length of penetration difference of the magnetic field of different frequency to detected material, therefore adopt square wave pulsed current to provide exciting current for field coil, can realize the detection of the different depth of inside, position to be detected.
Particularly, tunnel magnetoresistance array 102 comprises multiple tunnel magnetoresistance that matrix is arranged that are.
Tunnel magnetoresistance is based on magnetoresistance effect, the variation that detects eddy current magnetism that can be sensitive.
Preferably, impulse eddy current sensor also comprises modulate circuit 107, modulate circuit 107 is connected with tunnel magnetoresistance array 102 by winding displacement 108, and modulate circuit 107 is treated for the tunnel magnetoresistance of gating tunnel magnetoresistance array 102 variation of carrying out eddy current magnetism in detection position and detected.
By field coil 101, at the position to be detected of deep space probe, produce eddy current magnetism, adopt square wave pulsed current can produce at position to be detected the magnetic field of different frequency, the length of penetration difference of the magnetic field of different frequency to detected material, when its eddy current of inducting is blocked by the defect of material internal at the circulation path of inside, detected position, the distribution of eddy current magnetism also changes, by tunnel magnetoresistance array 102, detect this situation of change, can realize the damage check to this position.
Particularly, by each tunnel magnetoresistance in modulate circuit 107 timesharing gating tunnel magnetoresistance arrays 102, the eddy current magnetism that each tunnel magnetoresistance detects respectively institute corresponding region changes, if position to be detected is intact, the signal of output is square-wave signal, if damaging appears in position to be detected, the square-wave signal of output can carry relevant damage information.
The deep space probe landing for needs, before deep space probe lands, now can think that position to be detected is intact, treat detection position and detect, obtain reference signal, after deep space probe lands, again treat detection position and detect, obtain damage signal, reference signal and damage signal are carried out to difference processing, obtain peak signal, analyze this peak signal and can obtain the information such as position to be detected lesion size, lesion development trend.
For the deep space probe that does not need to land, before deep space probe transmitting, now can think that position to be detected is intact, treat detection position and detect, obtain reference signal, when after deep space probe transmitting, again treat detection position and detect, obtain damage signal, reference signal and damage signal are carried out to difference processing, obtain peak signal, analyze this peak signal and can obtain the information such as position to be detected lesion size, lesion development trend.
Therefore, described the first state is state before described deep space probe lands, and described the second state is state after described deep space probe lands; Or described the first state is state before described deep space probe transmitting, described the second state is state after described deep space probe transmitting.
As the optional embodiment of one, the impulse eddy current sensor that the present embodiment provides also comprises the shield shell 109 that is arranged at field coil 101 and tunnel magnetoresistance array 102 outsides, for shielding extraneous magnetic interference.
Impulse eddy current sensor, in space environment, by shield shell 109 and external environment isolation, improves the sensitivity detecting.
As the optional embodiment of one, shield shell 109 is provided with port, and signal output part and corresponding cabling are drawn from this port.
As the optional embodiment of one, impulse eddy current sensor also comprises nonmetal base 110, and nonmetal base 110 fixedly mounts with tunnel magnetoresistance array 102, for reducing the flux loss of field coil 101.
As the optional embodiment of one, nonmetal base 110 is provided with mounting hole 111, for impulse eddy current sensor being fixed on to the position to be detected of deep space probe.
Accordingly, can realize the damage check of surveying lander sensitive part for deep space, the deep space probe that the present embodiment provides has the following advantages with impulse eddy current sensor tool:
1, fill up the blank of China's prior art;
2, using tunnel magnetoresistance array as detecting element, have highly sensitive, volume is little, the feature such as lightweight, low in energy consumption;
3, adopt square wave pulsed current to provide exciting current for field coil, and using tunnel magnetoresistance array as detecting element, tunnel magnetoresistance can directly not contact, and has realized non-contact detection, has improved reliability in-orbit with detected position;
4, adopt square-wave pulse to carry out excitation, avoided the detection mode of scanning in-orbit, improved the space environment adaptive faculty of sensor;
5, detecting element adopts array layout, and pair array data analysis can obtain the relevant information of defect tendency and expansion trend, for deep space probe in-orbit safety evaluation provide support.
Embodiment bis-
With reference to figure 3, the present embodiment provides a kind of nondestructive detection system, comprising:
Impulse eddy current sensor 201;
Signal processor is asked difference to described reference signal and described damage signal, obtains peak signal, and described peak signal is described changes in distribution signal.
By signal processor, changes in distribution signal is analyzed the information such as the size, slight crack tendency of the damage that can obtain position to be detected.
The structure of impulse eddy current sensor 201 please refer to embodiment mono-, at this, is not repeating.
As the optional embodiment of one, the nondestructive detection system that the present embodiment provides also comprises:
As the optional embodiment of one, described system also comprises the amplifier 205 being connected between wave filter 204 and signal processor 203, for filtered reference signal and/or damage signal are amplified.
The nondestructive detection system that the present embodiment provides, can carry out Non-Destructive Testing to deep space probe, highly sensitive, antijamming capability is strong, reliability is strong, for detector in-orbit safety evaluation provide support.
Embodiment tri-
With reference to figure 4, the present embodiment provides a kind of deep space probe lossless detection method, comprising:
Step S301, produces eddy current magnetism for field coil provides square wave pulsed current with the position to be detected at deep space probe;
Step S302, detects respectively the situation of change of the eddy current magnetism of deep space probe in the first state and the second state corresponding output reference signal and damage signal by tunnel magnetoresistance array;
Step S303, carries out respective handling acquisition changes in distribution signal to described reference signal and described damage signal, according to the degree of impairment at position to be detected described in changes in distribution signal analysis.
Particularly, by tunnel magnetoresistance array, detect respectively the situation of change of the eddy current magnetism of deep space probe the first state and the second state, and corresponding output reference signal and damage signal, comprising:
At deep space probe, by each tunnel magnetoresistance in modulate circuit successively gating tunnel magnetoresistance array, detect eddy current magnetism the output reference signal of corresponding region during in the first state;
At deep space probe, by each tunnel magnetoresistance in modulate circuit successively gating tunnel magnetoresistance array, detect the eddy current magnetism of corresponding region and export damage signal during in the second state.
The deep space probe landing for needs, before deep space probe lands, position to be detected is intact, the signal at this time gathering is as reference signal, and after deep space probe lands, sensitive part may damage because impacted, and the signal now gathering is damage signal.
For the deep space probe that does not need to land, before deep space probe transmitting, position to be detected is intact, the signal at this time gathering is as reference signal, and when sensitive part after deep space probe transmitting may damage because impacted, the signal now gathering is damage signal.
Therefore, described the first state is state before described deep space probe lands, and described the second state is state after described deep space probe lands; Or described the first state is state before described deep space probe transmitting, described the second state is state after described deep space probe transmitting.
Further, described reference signal and described damage signal are carried out to respective handling acquisition changes in distribution signal, comprising:
Described reference signal and described damage signal are asked to difference, obtain peak signal, described peak signal is described changes in distribution signal.
Reference signal is square-wave signal, when the damage of position to be detected eddy current be damaged block, therefore the damage signal detecting is the square-wave signal with peak value, but due to the less difficult observation of this peak value, therefore reference signal and damage signal are carried out to difference processing, can obtain this peak signal, this peak signal is changes in distribution signal.
By signal processor, changes in distribution signal is analyzed, can be obtained the degree of impairment at position to be detected, comprise the information such as time that lesion size, slight crack tendency, damage occur.
As the optional embodiment of one, by tunnel magnetoresistance array, detect respectively the situation of change of the eddy current magnetism of deep space probe the first state and the second state, and after corresponding output reference signal and damage signal, afterwards, also comprise:
Reference signal and/or damage signal are carried out to filtering processing.
By filtering processing, can remove the burr of this reference signal and/or damage signal
As the optional embodiment of one, after reference signal and/or damage signal are carried out to filtering processing, also comprise:
Filtering reference signal after treatment and/or damage signal are amplified to processing.
The deep space probe lossless detection method that the present embodiment provides, can carry out Non-Destructive Testing to deep space probe, highly sensitive, antijamming capability is strong, reliability is strong, for detector in-orbit safety evaluation provide support.
In the various embodiments described above of the present invention, the sequence number of embodiment is only convenient to describe, and does not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, and there is no the part of detailed description in certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of programmed instruction, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM (read-only memory) (Read-Only Memory is called for short ROM), random access memory (Random Access Memory is called for short RAM), magnetic disc or CDs.
In the embodiment such as apparatus and method of the present invention, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.Simultaneously, in the above in the description of the specific embodiment of the invention, for a kind of embodiment, describe and/or the feature that illustrates can be used in same or similar mode in one or more other embodiment, combined with the feature in other embodiment, or substitute the feature in other embodiment.
Should emphasize, term " comprises/comprises " existence that refers to feature, key element, step or assembly while using herein, but does not get rid of the existence of one or more further feature, key element, step or assembly or add.
Finally it should be noted that: although described above the present invention and advantage thereof in detail, be to be understood that in the case of not exceeding the spirit and scope of the present invention that limited by appended claim and can carry out various changes, alternative and conversion.And scope of the present invention is not limited only to the specific embodiment of the described process of instructions, equipment, means, method and step.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use carry out with the essentially identical function of corresponding embodiment described herein or obtain process, equipment, means, method or step result essentially identical with it, that existing and will be developed future according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (10)
1. a deep space probe impulse eddy current sensor, is characterized in that, comprising:
Field coil, provides eddy current magnetism for the position to be detected for deep space probe under the effect of square wave pulsed current;
Tunnel magnetoresistance array, is connected with described field coil, the situation of change of the eddy current magnetism for detection of deep space probe in the first state and the second state, and generate corresponding reference signal and damage signal;
Signal output part, is connected with described tunnel magnetoresistance array, for exporting described reference signal and damage signal.
2. deep space probe according to claim 1 impulse eddy current sensor, is characterized in that, described field coil comprises coil and iron core, and described coil winding is on described iron core.
3. deep space probe according to claim 1 impulse eddy current sensor, is characterized in that, described tunnel magnetoresistance array comprises multiple tunnel magnetoresistance that matrix is arranged that are.
4. deep space probe according to claim 3 impulse eddy current sensor, it is characterized in that, described impulse eddy current sensor also comprises modulate circuit, described modulate circuit is connected with described tunnel magnetoresistance array by winding displacement, and described modulate circuit detects the variation of described position to be detected eddy current magnetism for the tunnel magnetoresistance of tunnel magnetoresistance array described in gating.
5. deep space probe according to claim 1 impulse eddy current sensor, is characterized in that, described impulse eddy current sensor also comprises the shield shell that is arranged at described field coil and tunnel magnetoresistance array outside, for shielding extraneous magnetic interference.
6. deep space probe according to claim 5 impulse eddy current sensor, it is characterized in that, described impulse eddy current sensor also comprises nonmetal base, and described nonmetal base and the fixed installation of described tunnel magnetoresistance array, for reducing the flux loss of described field coil.
7. deep space probe according to claim 6 impulse eddy current sensor, is characterized in that, described nonmetal base is provided with mounting hole, for described impulse eddy current sensor being fixed on to the position to be detected of deep space probe.
8. a nondestructive detection system, is characterized in that, comprises the deep space probe impulse eddy current sensor as described in as arbitrary in claim 1-7, also comprises:
Impulse source, is connected with described field coil, is used to described field coil that square wave pulsed current is provided;
Signal processor, is connected with described signal output part, for described reference signal and described damage signal are carried out to respective handling acquisition changes in distribution signal, according to the degree of impairment at position to be detected described in changes in distribution signal analysis.
9. nondestructive detection system according to claim 8, is characterized in that, described system also comprises the wave filter being connected between described signal output part and signal processor, for described reference signal and/or damage signal are carried out to filtering.
10. nondestructive detection system according to claim 9, is characterized in that, described system also comprises the amplifier being connected between described wave filter and signal processor, for filtered reference signal and/or damage signal are amplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310713720.8A CN103760225A (en) | 2013-12-20 | 2013-12-20 | Pulse vortex sensor and non-destructive detecting system for deep space probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310713720.8A CN103760225A (en) | 2013-12-20 | 2013-12-20 | Pulse vortex sensor and non-destructive detecting system for deep space probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103760225A true CN103760225A (en) | 2014-04-30 |
Family
ID=50527498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310713720.8A Pending CN103760225A (en) | 2013-12-20 | 2013-12-20 | Pulse vortex sensor and non-destructive detecting system for deep space probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103760225A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407047A (en) * | 2014-11-21 | 2015-03-11 | 昆明理工大学 | Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1267161A2 (en) * | 2001-06-12 | 2002-12-18 | General Electric Company | Inspection probe and system comprising a pulsed eddy current two-dimensional sensor array |
| EP1538441A1 (en) * | 2003-12-03 | 2005-06-08 | General Electric Company | Pulsed eddy current sensor probes and inspection methods |
| CN101750009A (en) * | 2009-12-31 | 2010-06-23 | 南京磁谷科技有限公司 | Magnetic-shielding eddy current sensor probe and method for reducing eddy current effect |
| CN101865883A (en) * | 2010-06-21 | 2010-10-20 | 南京航空航天大学 | Integration detection system of pulse eddy current stress cracking and method thereof |
| CN102549375A (en) * | 2009-09-21 | 2012-07-04 | 通用电气公司 | Eddy current inspection of case hardening depth |
-
2013
- 2013-12-20 CN CN201310713720.8A patent/CN103760225A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1267161A2 (en) * | 2001-06-12 | 2002-12-18 | General Electric Company | Inspection probe and system comprising a pulsed eddy current two-dimensional sensor array |
| EP1538441A1 (en) * | 2003-12-03 | 2005-06-08 | General Electric Company | Pulsed eddy current sensor probes and inspection methods |
| CN102549375A (en) * | 2009-09-21 | 2012-07-04 | 通用电气公司 | Eddy current inspection of case hardening depth |
| CN101750009A (en) * | 2009-12-31 | 2010-06-23 | 南京磁谷科技有限公司 | Magnetic-shielding eddy current sensor probe and method for reducing eddy current effect |
| CN101865883A (en) * | 2010-06-21 | 2010-10-20 | 南京航空航天大学 | Integration detection system of pulse eddy current stress cracking and method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 丁天怀等: "电涡流传感器阵列测试技术", 《测试技术学报》 * |
| 刘波等: "平板表层缺陷检测涡流阵列传感器的设计", 《传感技术学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407047A (en) * | 2014-11-21 | 2015-03-11 | 昆明理工大学 | Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8907665B2 (en) | Magnetostrictive sensor array for active or synthetic phased-array focusing of guided waves | |
| CN107064291B (en) | Magnetic gathering pulse eddy current coil detection sensor | |
| CN107045149B (en) | A kind of all-wave NMR signal noise filtering method based on double singular value decompositions | |
| US11493479B2 (en) | Low-frequency electromagnetic detection method for large-scale damage of ferromagnetic materials based on broadband excitation | |
| Yan et al. | Online nondestructive testing for fine steel wire rope in electromagnetic interference environment | |
| DE102013003500A1 (en) | Method for detecting time-varying thermo-mechanical stresses and / or stress gradients across the wall thickness of metallic bodies | |
| CN106442711B (en) | Nondestructive testing method based on eddy current reflection and transmission | |
| CN106353397A (en) | Vehicular magnetic flux leakage detecting equipment and system for steel rail surface damage | |
| Xiucheng et al. | Design of tunnel magnetoresistive-based circular MFL sensor array for the detection of flaws in steel wire rope | |
| CN105067701B (en) | Pulsed eddy current testing hardware separation method based on rectangular probe | |
| CA2990468C (en) | A modified halbach nmr array sensor for analyzing core or fluid samples from a subsurface formation | |
| Zhou et al. | Health monitoring of rail structures using guided waves and three‐dimensional diagnostic imaging | |
| CN106772632A (en) | A kind of tunnel geological detection method based on time delay transient electromagnetic | |
| CN105548349B (en) | Realize the rectangular probe pulse eddy current detection method of Root cause analysis technology | |
| CN104049031A (en) | Subsurface defect detection device and method based on alternative current electromagnetic field | |
| CN201051089Y (en) | A real time multi-channel whirlpool and magnetic memory/magnetism leakage detection device | |
| CN101231265A (en) | Electromagnetic nondestructive testing probe | |
| CN103760225A (en) | Pulse vortex sensor and non-destructive detecting system for deep space probe | |
| Zhou et al. | A new detection method based on magnetic leakage theory and BP neural network for broken steel strands in ACSR conductor | |
| CN103760227A (en) | Nondestructive detection method for deep space detector | |
| CN108037178B (en) | Low-frequency electromagnetic array sensor for detecting corrosion defects of metal pipeline | |
| CN103760226A (en) | Non-destructive detection method of spacecraft | |
| CN109212019A (en) | A kind of far-field eddy and magnetic striction wave guide hybrid sensor and its detection method | |
| CN205879865U (en) | Nondestructive detection system based on vortex reflection and transmission | |
| CN109490406A (en) | Dynamic magnetic detection system, detection method and electromagnetism control battle array method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140430 |