CN100365438C - Detector for detecting embedded magnetic material - Google Patents
Detector for detecting embedded magnetic material Download PDFInfo
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- CN100365438C CN100365438C CNB200510071660XA CN200510071660A CN100365438C CN 100365438 C CN100365438 C CN 100365438C CN B200510071660X A CNB200510071660X A CN B200510071660XA CN 200510071660 A CN200510071660 A CN 200510071660A CN 100365438 C CN100365438 C CN 100365438C
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- sensor
- detecting
- imbedding
- detecting device
- primary processor
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
-
- 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
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
Abstract
A detector for detecting embedded magnetic material is disclosed. The detector is capable of accurately measuring the position of embedded material by detecting the magnetic field generated by ferromagnetic mark additive to the embedded material. The detector contains detecting part with the first to forth detecting sensors and a processor for parallel processing to the signals from the detecting sensors which are arranged along a straight line in the probe relative to the orientation of the embedded material, and spaced one another from remote end of the probe; and a main processor used for determining the embedded material is ferromagnetic material or weak-magnetic material. The main processor compares the detecting results of the first sensor to the forth sensor locating in different position of the probe to determine the embedded material is ferromagnetic material or weak-magnetic material.
Description
Technical field
The present invention relates to a kind of magnetic field that produces by the detection magnetic mark and accurately detect the detecting device of imbedding object space, wherein said magnetic mark is become and is attached to imbed on the object by the strong permanent magnetic system, more specifically, relate to the detecting device that is used to detect the ferromagnetism object of imbedding, this detecting device has a plurality of sensors to judge that effectively this magnetic bodies of imbedding is strong magnetic material or weak magnetic material.
Background technology
Fast development of urbanization makes the equipment of water, gas and electricity gas and telecommunication line install to increase sharply so that the infrastructure as electric, telecommunications and plumbing to be provided.For the appearance of the city attractive in appearance and the protection facility purpose, above-mentioned circuit is embedded in underground usually.But not only abundant inadequately about buried place on line information, and the workman can not detect with visual means and imbed the position and the situation of object, thus be unfavorable for maintenance and repairerment to imbedding object.In addition, to underground when imbedding new object or constructing new buildings, need to detect exactly and imbed the position of object and transition expends time in and expense.But can't accurately detect the object of imbedding if implement construction work, when carrying out building operation, can damage or damage this object of imbedding so and injure the build labourer.
In order to detect the position of imbedding object, conventional way is to detect from imbedding the ripple vibration of object or dieletric reflection to underground radiation electric wave, ultrasound wave or hyperfrequency waves.But, imbed object because said method utilization analysis ripple vibrates to detect, so need to utilize expensive equipment to carry out detecting the position of the equipment of imbedding such as complicated algorithm such as Fourier transform, error correction and Functional Analysis tests.
Another conventional method is to lay magnetic coil on the top of imbedding object, and the probe on ground detects the magnetic field that produces electric current from magnetic coil by induced magnetism.If but magnetic coil can not accurately be installed in the top of imbedding object, when excavating and burying work, just can not detect the position of imbedding object easily so.In an extreme example, magnetic coil also can be lost.
Meanwhile, in order to solve these technical matterss, Korean patent registration No. is: 430385 patent disclosure " detecting device of the position of the magnetic bodies that utilizes magnetic mark to detect to imbed is to arrange to arrange the described object (Detector for detecting a location ofa buried magnetic object using a magnetic marker for managinga buried object) of imbedding " be incorporated herein its content.
In above-mentioned patent, adopt two sensors, judged the position that is embedded in underground magnetic material with the difference of utilizing each measurement value sensor.
But detecting device adopt two sensors situation under, be difficult to judge the magnetic mark of strong magnetic material and the ordinary metallic material of weak magnetic material.That is to say, because when the difference of two measurement value sensors is timing, detecting device should be judged to be strong magnetic material with the object of imbedding, even be embedded under the underground situation at weak magnetic material, this detecting device can be strong magnetic material with the object identification that is embedded in also.
Summary of the invention
Correspondingly, the invention solves the technical matters that exists in the above-mentioned prior art.An object of the present invention is to provide a kind of detecting device of imbedding object that is used to detect, this detecting device has a plurality of sensors, described sensor can detect the magnetic mark that is positioned at underground strong magnetic material exactly, and distinguishes with the plain metal of weak magnetic material.
This detecting device comprises: a plurality of signal processors and the primary processor that have the probe of first to fourth detecting sensor, link to each other respectively with described first to fourth detecting sensor; Described first to fourth detecting sensor sequentially along line spread in respect to the described probe of imbedding object orientation, these sensors are spaced from each other from the far-end of probe; Described first to fourth detecting sensor detects and is additional to the magnetic field that the described ferromagnetism mark of imbedding on the object produces, the detection signal of these detecting sensors is sent to separately signal processor respectively so that signal is carried out parallel processing, the signal of this process parallel processing is fed to described primary processor by an input interface, and wherein to imbed object with judgement be strong magnetic material or weak magnetic material to this primary processor testing result of relatively being positioned at first sensor to the four-sensor of probe on the diverse location.
Another object of the present invention provides a kind of detecting device of imbedding object that is used to detect, and this detecting device has a plurality of sensors, and it can detect the object of imbedding by the PDA(Personal Digital Assistant) screen and need not on-the-spot mapping.Because the information data by this detecting device is transmitted to the mobile device of (GPS) function that has GPS, for example PDA is handled simultaneously by it.
In order to realize these purposes, be provided with and detect the detecting device of imbedding object, it can be attached to this by detection and imbed the magnetic field that the ferromagnetism mark on the object produced and measure the position that this imbeds object exactly, it comprises a test section, this test section has first to fourth detecting sensor, they in order along line spread one with respect to imbedding in the object orientation probe, these sensors are from the arrangement that is spaced from each other of the far-end of probe; Signal processor with the detection signal that is used for each sensor of parallel processing; Primary processor, being used for according to the object that the signal determining of test section is imbedded is strong magnetic material or weak magnetic material, wherein the primary processor comparison judges that from the testing result of first to fourth sensor that is positioned at the probe diverse location object of imbedding is strong magnetic material or weak magnetic material, and (A＜B), this primary processor judges that imbedding object is strong magnetic material during less than poor (B) of the measured value of the second and the 3rd sensor as poor (A) of the measured value of first and second sensors.
In an exemplary embodiment of the present invention, when the measured value of A＜B and four-sensor during less than the measured value of the 3rd sensor, primary processor judges that imbedding object is strong magnetic material.
According to the present invention, described detecting device also comprises be used to judge whether described probe the is in vertical position inclinometer of (i.e. the upright position of this detecting device).
In addition, according to the present invention, described primary processor comprises the voice output that is used to show the LCD (LCD player) of primary processor output and is used to export the primary processor output data; And comprise the GPS receiver, and be used for receiving current location current location is input to primary processor and an external system connector by GPS, be used for connecting the input of GIS information from outside generalized information system with wired or wireless mode.
Therefore primary processor can apply voice signal by the numerical data that input is exported from the test section.In addition, primary processor can write down and store from position that the GPS receiver receives, inquiry from the information of imbedding object of the measurement zone of outside generalized information system, calculate numerical data with numerical value or graphical format output or the position that is relatively received with about the information of imbedding object and will export to LCD about the information of imbedding object corresponding to receiving position.
Description of drawings
Before above-mentioned and other purpose, feature and advantage of the present invention will more clearly be presented in scope of readers by the description below in conjunction with accompanying drawing.In described accompanying drawing:
Fig. 1 shows the method that is embedded in underground object that detects;
Fig. 2 is about the block scheme that is used to detect the structure of the detecting device of imbedding object according to the present invention;
Fig. 3 shows according to a structure of implementing the fluxgate sensor of side of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing the preferred embodiments of the present invention are described.Hereinafter reaching in the accompanying drawing of instructions, identical Reference numeral is used for marking identical parts, has omitted being repeated in this description same parts or similar parts.
Fig. 1 shows the method for imbedding underground object that detects.
Employing has the permanent magnet (ferrite) of certain magnetic force and makes magnetic mark 1 by technologies such as waterproof, protection against the tide, nickel plating, carbamate surface-coated.When comprising objects 18 such as water pipe, municipal steam line, electric and telecommunication line in provided underground, magnetic mark 1 is attached on the object 18.Generally the N utmost point of magnetic mark 1 is placed up, in any case but also the S utmost point can be placed up.
Meanwhile, fluxgate sensor 12a, 12b, 12c and 12d, i.e. 4 magnetic field detection sensor, in order from its far-end 11a with respect to the ground orientation be arranged in and comprise the probe 11 of imbedding object detection device 10.Fluxgate sensor 12a, 12b, 12c and 12d measure magnetic field.In said process, each fluxgate sensor 12 is vector sensors, measures the average magnetic field component corresponding to each measurement axis.Above-mentioned institute's measuring magnetic field component data is handled in the primary processor 20 of detecting device 10, apply voice signal by the loudspeaker 13 that is placed in wherein, by LCD 14 with numerical value or graphics mode video data, perhaps described data are sent to the computing machine that links to each other with interface, promptly have the PDA device 30 of GPS function.
In addition, detecting device 10 comprises the inclinometer of the plumbness that is used for measuring sonde 11.Generally speaking, in order to detect magnetic mark 1, detecting device 10 detects the object of imbedding under probe 11 states that are in vertical position, and judges by inclinometer 15 whether probe 11 is in vertical position.
Fig. 2 is the block scheme that the detecting device of object is imbedded in detection according to the present invention.
4 fluxgate sensors 12 are placed in the probe 11 with linear fashion.That is: probe 11 far-end 11a with the upright position with contact.First sensor 12a is positioned at ground, and the second sensor 12b is positioned at the height apart from ground 10-20cm, and the 3rd sensor 12c is positioned at the height apart from ground 40-50cm, and four-sensor 12d is positioned at the height apart from ground 50-60cm.Each fluxgate sensor 12 is measured and is in the magnetic field that its locational magnetic mark 1 produces, and the signal processor 16 that the magnetic field data of being surveyed is transfused to corresponding each sensor 12 carries out parallel processing fast with the signal to each sensor 12.Though sort processor 16 is disclosed combination Korean patent registration No. in the present invention: in 430385 the patent, but as the digital inclinometer that is used for two sensor frequency of integrated processing, it is different with the digital inclinometer in the above-mentioned Korean Patent that the processor 16 of independent processing respective sensor frequency of the present invention is installed in each sensor 12 individually.
The numerical data of processor 16 outputs is sent to primary processor 20 so that with numerical value or graphics mode output through input interface 21.This primary processor 20 receives corresponding to the digital signal of magnetic field intensity and calculates the magnetic field intensity that produces at magnetic field mark 1 place.The value of calculating is shown on LCD 14 by the output interface 22 that drives LCD 14 with numerical value or graphical format.
And inclinometer 15 utilizes the degree of tilt of its sensor measurement detecting device 10 and these degree of tilt data is sent to primary processor 20.Primary processor 20 receives the degree of tilt of calculating detecting device 10 corresponding to the digital signal of detecting device 10 degree of tilt.The value of being calculated is in the discernible mode of user, and promptly numerical value, figure or alternate manner are expressed, and are transmitted to LCD 14 by output interface 22, make the user can recognize the upright position of detecting device 10 thus.
In addition, primary processor 20 can be connected with GPS receiver and external system connector 24.GPS receiver 23 can receive the current location of detecting device 10 by GPS.The current location information that is received is handled and is recorded in the primary processor 20 by primary processor 20.External system connector 24 is by wired or wireless system and outer computer, as the PDA30 with generalized information system connects with inquiry and is in the information of imbedding object in the current measurement zone.Meanwhile, PDA30 can also comprise the function of GPS receiver 23.
The numeral output of primary processor 20 reference sensors 12 receives the current location information from GPS receiver 23.When magnetic mark 1 has been imbedded in its affirmation, and by external system connector 24 to outside generalized information system 30 inquiries corresponding to the information of imbedding object of current location to receive and with reference to described information.Primary processor 20 compares and searches about information and the position thereof of imbedding object and also with the discernible form of user (for example character or figure) this information is exported to LCD 14 by output interface 22 to confirm the information of imbedding object.
In addition, primary processor 20 can receive about the information of current location or the information of imbedding object of searching about the user by GPS receiver 23, as imbed the kind and the length of embedment thereof of mark 1, and export this information with character or graphical format by LCD 14.
In addition, from the numerical data of primary processor 20 output as amplitude input (as the analoging sound signal of 0-2.5V) by loudspeaker 13 via output interface 26 outputs, with numerical data as voice output corresponding to this numerical data intensity.
Fig. 3 shows the structure of fluxgate sensor 12 according to an embodiment of the invention.
As shown in Figure 3, fluxgate sensor 12 comprises the detecting coil 120 that is driven the saturated magnetic core 122 of coil 121 periodicity and measures magnetic field in the drive coil 121.Drive coil 121 is wrapped on the magnetic core 122, and detecting coil 120 is wrapped in the scope of whole drive coil 121 on this drive coil 121.
Generally, detecting coil 120 can't detect the magnetic field that drive coil produces as solenoid, but when applied extra externally-applied magnetic field, produces pure magnetic field by the magnetic hysteresis of drive coil 121 and is detected coil 120 detections.Because above-mentioned unique texture is to the sensitivity of external magnetic field and the directional correlation connection of detecting coil 120.
The fluxgate sensor 12 that uses as magnetic field detector in the present embodiment is commercially available sensor FGM-3, its measurement range is ± 50 μ T (± 0.5G).Resolution is about 10nT (0.1mG).Therefore, fluxgate sensor 12 can detect very little changes of magnetic field delicately.But, because detecting device 10 uses 4 fluxgate sensors 12 that are arranged in diverse location to detect poor between the magnetic field of independent measurement, so the linearity of sensor is very unimportant.The output of fluxgate sensor 12 is 5 volts of square waves that can conveniently use, and according to the magnetic field intensity difference of fluxgate sensor 12 present positions, the frequency range of this square wave is greatly about 50kHz-120kHz (period T=8.5-25 microsecond).
Table 1 has provided the magnetic field data of probe to measuring with the buried magnetic mark of predetermined depth that employing according to the present invention has the detecting device of the sensor of placing a plurality of spaces, is unit representation with kHz.
Table 1
| |
|
Sensor 3 | (A: sensor 1-sensor 2)＜(B: sensor 2-sensor 3) |
| 44.36 | ?44.10 | ?43.43 | ?0.26＜0.67 |
| 44.74 | ?47.33 | ?45.66 | ?0.41＜1.67 |
| 43.33 | ?42.10 | ?40.25 | ?1.23＜1.85 |
| 49.09 | ?47.46 | ?45.13 | ?1.63＜2.33 |
With reference to table 1, detecting device 10 has obtained maximum frequency from the first sensor 12a that is placed in the most contiguous ferromagnetism mark 1, obtained middle frequency from being placed in time second sensor 12b of contiguous magnetic mark 1, and obtained minimum frequency from being placed in apart from magnetic mark 1 the 3rd sensor 12c farthest.
Analyze above-mentioned measurement data, the measured value (A) of first sensor-second sensor is less than the measured value (B) of second sensor-the 3rd sensor, that is: A＜B.
For example, because the first sensor survey frequency is 44.36kHz, the second sensor measurement frequency is 44.10kHz, and the 3rd sensor measurement frequency is 43.43kHz, so A is 0.26kHz, B is 0.67kHz, thus A＜B.Therefore, as A＜B, detecting device 10 of the present invention confirms that the object of imbedding is a strong magnetic material.
Meanwhile, contiguous the 3rd sensor 12c of four-sensor 12d is placed in apart from first sensor 12a farthest to obtain the reliability of detecting device 10.When the frequency of four-sensor 12d during less than the frequency of the 3rd sensor 12c, it is strong magnetic material that detecting device 10 identifies the object of imbedding.
That is to say that according to exemplary embodiments of the present invention, when the measured value of A＜B and four-sensor 12d during less than the measured value of the 3rd sensor 12c, it is strong magnetic material that detecting device 10 identifies the object of being imbedded.
Table 2 has provided the probe of detecting device that employing according to the present invention has the sensor of a plurality of spaces placing to buried with predetermined depth or be positioned at the magnetic field data of ground as the measurement of the plain metal of weak magnetic material, is unit representation with kHz.
Table 2
| |
|
Sensor 3 | (A: sensor 1-sensor 2)＜(B: sensor 2-sensor 3) | Condition |
| 55.38 | ?46.08 | ?43.31 | ?9.3＞2.77 | Grid |
| 49.21 | ?42.61 | ?39.21 | ?6.6＞3.4 | Manhole |
| 189.66 | ?67.56 | ?42.60 | ?122.1＞24.96 | Iron pipe |
With reference to table 2, detecting device 10 has obtained maximum frequency from being placed in the most contiguous first sensor 12a that imbeds underground metal, obtained middle frequency from being placed in time contiguous second sensor 12b that imbeds underground metal, and obtained minimum frequency from being placed in apart from imbedding underground metal the 3rd sensor 12c farthest.
Analyze above-mentioned measurement data, different with table 1, the measured value (A) of first sensor-second sensor is greater than the measured value (B) of second sensor-the 3rd sensor, that is: A＞B.
Therefore, as A＞B, it is weak magnetic material that detecting device according to the present invention identifies the object of imbedding.
Though the N utmost point of the magnetic mark that the present invention showed is with respect to the ground planar orientation, also can make the S utmost point with respect to the ground planar orientation, because the sensor apart from the highest distance position of distal probe has maximum frequency, the software in the detecting device 10 is correspondingly revised so that show and the content of table 2 is put upside down by institute.But this still belongs to design of the present invention, and promptly detecting device 10 judges that by the difference that compares between the measured magnetic field of each sensor imbedding object is strong magnetic material or weak magnetic material.
Be appreciated that from top description detecting device detection of the present invention is additional to the ferromagnetism mark of imbedding on the object (as water supply and sewage work, municipal steam line, electric and telecommunication line), comes effectively and accurately to discern the position of imbedding object.Thereby can conveniently safeguard, can conveniently monitor the inner structure of imbedding object, when imbedding new object or carrying out new construction work, reduce and damage the probability of before having imbedded object and the infringement that reduces the workman imbedding object.
In addition, owing to can easily distinguish ferromagnetism mark and weak ordinary metallic material, thus can identify magnetic mark easily, and the final position of accurately confirming to imbed object.
In addition, according to the present invention, utilize the accurately current detected position of record/storage of GPS receiver and PDA terminal, compare in advance and search position and the information of imbedding object by the information of imbedding object in the generalized information system inquiry measurement zone is installed, can install easily and be used to discern since the object management system that imbeds that imbeds object space visually display result.
Though specific embodiment describes the present invention by reference, those of ordinary skills can understand and can also carry out various improvement and not depart from design of the present invention it.The scope that the present invention asks for protection is defined by the appended claims.
Claims (5)
1. one kind is used to detect the detecting device of imbedding object, and this detecting device comprises:
The a plurality of signal processors and the primary processor that have the probe of first to fourth detecting sensor, link to each other respectively with described first to fourth detecting sensor;
Described first to fourth detecting sensor sequentially along line spread in respect to the described probe of imbedding object orientation, these sensors are spaced from each other from the far-end of probe;
Described first to fourth detecting sensor detects and is additional to the magnetic field that the described ferromagnetism mark of imbedding on the object produces, the signal that these detecting sensors detect is transmitted to signal processor separately, these signal processors carry out parallel processing to the signal of the detection of described detecting sensor, described signal through parallel processing is fed to described primary processor by an input interface
Wherein to imbed object with judgement be strong magnetic material or weak magnetic material to this primary processor testing result of relatively being positioned at first sensor to the four-sensor of probe on the diverse location.
2. according to the detecting device of claim 1, wherein, (A＜B) and the measured value of four-sensor are during less than the measured value of the 3rd sensor, and described primary processor identifies and imbeds object is strong magnetic material as poor (A) of first and second measurement value sensors during less than poor (B) of the second and the 3rd measurement value sensor.
3. according to the detecting device of claim 1, this detecting device also comprises an inclinometer of judging whether described probe is in vertical position.
4. according to the detecting device of claim 1, wherein, in probe: first sensor is positioned at ground, and second sensor is positioned at the height apart from ground 10-20cm, the 3rd sensor is positioned at the height apart from ground 20-50cm, and four-sensor is positioned at the height apart from ground 30-60cm.
5. according to the detecting device of claim 1, wherein, described primary processor comprises:
LCD is used to the data that show that primary processor is exported;
Voice output is used for the output data with audio format output primary processor;
The GPS receiver, be used for by GPS receive current location with current location is input to primary processor and
The external system connector is used for connecting the input of GIS information with wired or wireless mode from outside generalized information system,
Wherein primary processor receives from the numerical data of probe output, record and storage are from the position of GPS receiver reception, inquiry from outside generalized information system about imbedding the information of object in the measurement zone, calculate numerical data with numerical value or graphical format output, perhaps relatively and the position that received of search and imbed the information of object, and will export to LCD about the information of imbedding object corresponding to receiving position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040108619A KR100602525B1 (en) | 2004-12-20 | 2004-12-20 | A detector for detecting the buried magnetic objects |
| KR108619/04 | 2004-12-20 |
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| Publication Number | Publication Date |
|---|---|
| CN1794012A CN1794012A (en) | 2006-06-28 |
| CN100365438C true CN100365438C (en) | 2008-01-30 |
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| CNB200510071660XA Expired - Fee Related CN100365438C (en) | 2004-12-20 | 2005-05-12 | Detector for detecting embedded magnetic material |
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| KR (1) | KR100602525B1 (en) |
| CN (1) | CN100365438C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100837636B1 (en) * | 2006-05-09 | 2008-06-12 | 주식회사 코리아일레콤 | System and method for detecting unknown source producing signal under ground |
| KR100883794B1 (en) * | 2008-07-04 | 2009-02-19 | (주)선인이엔지 | Device for surveying pipe and method for surveying pipe using the same and system for surveying pipe using the same |
| KR100877073B1 (en) * | 2008-07-04 | 2009-01-07 | (주)선인이엔지 | Device for surveying pipe and method for surveying pipe using the same and system for surveying pipe using the same |
| KR100947659B1 (en) | 2010-01-06 | 2010-03-15 | (주) 이우티이씨 | Detecting apparatus for sensing buried magnetic substance and method for detecting buried magnetic substance by using the same |
| KR101128393B1 (en) * | 2011-05-25 | 2012-03-23 | (주) 이우티이씨 | Apparatus and method for detecting a location of an underground facilities |
| KR101550855B1 (en) * | 2014-06-20 | 2015-09-08 | 김평 | System for managing of Submarine Cable Using Magnetic Maker and Method Thereof |
| KR101517760B1 (en) * | 2014-10-07 | 2015-05-07 | 김평 | Calibration method and device for measuring a position and depth of magnetic marker |
| KR200485055Y1 (en) * | 2016-06-14 | 2017-11-23 | 대우조선해양 주식회사 | Portable detector for the throwing |
| CN114923133A (en) * | 2022-06-06 | 2022-08-19 | 国家石油天然气管网集团有限公司 | Internal detector positioning device, method, equipment and medium based on weak magnetic detection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6124712A (en) * | 1997-05-16 | 2000-09-26 | The Regents Of The University Of California | Apparatus and method for imaging metallic objects using an array of giant magnetoresistive sensors |
| KR100430385B1 (en) * | 2003-06-04 | 2004-05-10 | (주) 이우티이씨 | A magnetic locator for locating buried objects by using magnetic markers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10115683A (en) * | 1996-07-01 | 1998-05-06 | Tokin Corp | Detecting method for predetermined position of underground piping |
-
2004
- 2004-12-20 KR KR1020040108619A patent/KR100602525B1/en active IP Right Grant
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2005
- 2005-05-12 CN CNB200510071660XA patent/CN100365438C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6124712A (en) * | 1997-05-16 | 2000-09-26 | The Regents Of The University Of California | Apparatus and method for imaging metallic objects using an array of giant magnetoresistive sensors |
| KR100430385B1 (en) * | 2003-06-04 | 2004-05-10 | (주) 이우티이씨 | A magnetic locator for locating buried objects by using magnetic markers |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060070004A (en) | 2006-06-23 |
| CN1794012A (en) | 2006-06-28 |
| KR100602525B1 (en) | 2006-07-25 |
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