KR100602525B1 - A detector for detecting the buried magnetic objects - Google Patents

Abstract

 The present invention, in order to detect the magnetic field generated from the magnetic marker of the ferromagnetic material attached to the underground buried more precisely to measure the position of the underground buried, it is provided sequentially spaced from the tip of the detection rod on a straight line of the axis of the detection rod facing the underground buried A detection unit comprising four first to fourth detection sensors, a signal processing processor for processing the signals from the detection sensors in parallel, and a master processor for determining ferromagnetic and weak magnetic materials in accordance with the signals from the detection sensors. In the underground buried detector consisting of, the master processor, the measured value of the first sensor closest to the tip of the detection rod and the measured value of the second sensor adjacent to the first sensor and located farther from the tip than the first sensor The difference (A value) is adjacent to the measured value of the second sensor and the second sensor and is above the second sensor. When indicated that in the small (A value <B value) than the difference (B value) of the measured values of the three sensors located in the remote, provides a ground maeseolmul detector characterized in that determining that the detected ferromagnetic body.

Underground Management, Magnetic Marker, Underground Detector

Description

A detector for detecting the buried magnetic objects with multiple sensors             

1 is an explanatory diagram of a method for detecting underground buried materials with magnetic markers of ferromagnetic materials buried underground;

2 is an overall configuration diagram of the underground buried detector of the present invention,

3 is a structural diagram of a fluxgate sensor according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1-magnetic marker, 10-detector,

11-detection rod, 12a, 12b, 12c, 12d-sensor,

16a, 16b, 16c, 16d-processors for processing signals from sensors,

16-master processor.

The present invention relates to an underground buried detector for detecting a magnetic field generated from a magnetic marker made of permanent magnets attached to underground buried to more accurately detect the location of the underground buried, in particular to be able to effectively distinguish between a ferromagnetic and weak magnetic material The underground buried detector is provided with a plurality of sensors.

As urbanization progresses rapidly, the installation of water and sewage pipes, city gas supply pipes, and electric and communication lines is rapidly increasing to expand infrastructure such as electricity, telecommunications, and water and sewage. These facilities are mostly buried underground due to the beauty and protection of equipment. However, since the information on the location and depth of such underground deposits is not well prepared and it is difficult to grasp the location or state through vision, it is difficult to maintain the underground deposits. In addition, when installing new underground works or constructing a building, time and cost are increased to accurately locate the existing underground works, and when it is not known, the existing underground works are destroyed or under construction, It becomes dangerous.

Conventionally, in order to detect the location of the underground buried material, to detect underground buried material on the ground, the method of detecting the wavelength change propagated through the medium and buried material after propagating electromagnetic waves, ultrasonic waves, ultra-high frequency, etc. to the ground as a medium Was used. However, since this conventional technique is to locate the underground buried material by analyzing the frequency of the measured wavelength, it is necessary to make and apply complicated and difficult algorithms such as Fourier transform, error correction, and functional diagnostic test for analysis. There is a problem that requires expensive equipment for.

Another method is to install a magnetic coil on the upper layer of underground burial, and to find the magnetic field of current generated from the magnetic coil installed by the ground detector. However, this technique has a disadvantage in that it is difficult to locate the magnetic coil or lose the magnetic coil if the magnetic coil is incorrectly installed during the excavation and buried construction.

On the other hand, the applicant of the present invention, in order to solve such a problem, has disclosed a "underground buried detector for detecting the location of underground buried using a magnetic marker for underground buried management registered in Korea Patent Registration No. 0430385 The description is incorporated in the present invention.

In the above-mentioned patent, two sensors are used to grasp the position of the magnetic body in the ground by using the difference in the value measured by each sensor.

By the way, in the case of the detector using the two sensors as described above, there was a problem that it is difficult to distinguish between the magnetic marker of the ferromagnetic material and the general metal body of the weak magnetic material. In other words, if the difference between the values measured by the two sensors is positive, it can only be judged as a ferromagnetic material. Therefore, even when a weak magnetic material is buried in the ground, it is positive. There was a high probability of error.

Accordingly, the present invention has been invented to solve the above problems, the object of the present invention is to provide a underground buried detector equipped with a plurality of sensors that can be accurately detected by distinguishing the magnetic marker of the ferromagnetic material located in the ground with a weak magnetic material. It is done.                         

In addition, since the information data measured by the underground buried detector is transmitted to and stored at the same time as a mobile device having a GPS function, such as a PDA, a plurality of sensors that can detect underground buried material through the PDA screen without a separate site drawing An object of the underground buried detector provided with.

In order to achieve the above object, the present inventors detect the magnetic field generated from the magnetic marker of the ferromagnetic material attached to the underground buried material to more accurately measure the location of the underground buried material, and the tip of the detection bar on a straight line of the axis of the detection rod facing the underground buried material. A detection unit comprising four first to fourth detection sensors sequentially spaced from and a signal processing processor for processing the signals from the detection sensors in parallel, and a ferromagnetic material and a weak magnetic material according to the signal from the detection part. In the underground buried detector comprising a master processor for determining, the master processor, the second sensor is located farther from the tip than the first sensor and the measured value of the first sensor closest to the tip of the detection rod and the first sensor The difference (A value) of the measured value of the sensor is determined by the measured value of the second sensor and the second sensor. It is determined that the ferromagnetic material attached to the underground buried material is detected when the contact value is smaller than the difference (B value) of the measured value of the third sensor located farther from the tip than the second sensor (A value <B value).

In a preferred embodiment of the present invention, the master processor is the A value <B value, the measured value of the fourth sensor adjacent to the third sensor and located farther from the tip than the third sensor is the value of the third sensor. When smaller than the measured value, it is determined that the ferromagnetic material is detected.

According to the present invention, the underground buried detector further comprises a horizontal sensor for detecting the vertical state of the detection rod (that is, the vertical state of the detector).

In addition, according to the present invention, the microprocessor includes an LCD display for image output of data output from the master processor, and an audio output means for outputting data output from the master processor as sound,

It further comprises a GPS receiver for receiving the current position through the GPS input to the master processor and an external system connection for connecting the GIS information input from the external GIS system by wireless or wired.

According to this, the master processor may receive the digital data output from the detector and emit an audio signal. In addition, it records and stores the position received from the GPS receiver and inquires every set report of the measurement area from an external GIS system, and calculates or compares the received position and the set report in order to output the digital data as numbers or graphs. And search, and outputs the setting information corresponding to the received position on the LCD display.

(Example)

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 1 illustrates a method for detecting underground buried underground buried.

The magnetic marker (1) is a permanent lifespan and is produced by waterproofing, moisture-proof, nickel plating, urethane film coating, etc. of permanent magnets of constant magnetic force, and water and sewage pipes, city gas supply pipes, electric and communication lines, etc. It is attached to this facility during the construction of the underground burial site 18. Usually, the magnetic body is installed so that the N pole is directed upward, but in some cases, the S pole is installed upward.

Meanwhile, the fluxgate sensors 12a, 12b, 12c, and 12d, which are four magnetic field detection sensors sequentially provided from the front end portion 11a located in the support rod 11 constituting the underground deposit detector 10, generate magnetic fields. Measure Here, each fluxgate sensor 12 is a vector sensor and measures an average magnetic field component corresponding to each sensing axis. The measured magnetic field data is processed in the master processor 20 of the device 10 to be described later to emit an acoustic signal through the built-in speaker 13, or to form the LCD display 14 in the form of numerical values or graphs. It is displayed or transmitted to a computer connected to the interface means, such as PDA means 30 having a GPS function, and processed.

In addition, the detector 10 is provided with a level gauge 15 for measuring the vertical state of the support bar (11). In general, the detector 10 detects the support rod 11 in a vertical state to detect the ferromagnetic material 1, and detects the vertical state of the support rod 11 through the horizontal system 15.

2 is a view showing the overall configuration of the underground buried detector of the present invention.

Four fluxgate sensors 12 are installed on the support rod 11 so that the shafts are in a straight line. That is, when the front end portion 11a of the support rod 11 is brought into contact with the ground and is standing vertically, the first sensor 12a is positioned on the ground, and the second sensor 12b is positioned approximately 10-20 cm from the ground. The third sensor 12c is positioned at approximately 40-50 cm from the ground, and the fourth sensor 12d is installed at the support rod 11 at approximately 50-60 cm from the ground, and each fluxgate sensor ( 12 measures magnetic fields generated at the magnetic marker 1 at their respective positions, and the measured magnetic field data is installed to rapidly parallel the signals from each sensor 12 to each corresponding signal processing processor 16. ). On the other hand, the processor 16 is disclosed as a digital gradometer which integrates and processes the frequency values from two sensors in the applicant's Korean Patent Registration No. 0430385, the technology of which is incorporated in the present invention. The processor 16 in the present invention is distinguished from the prior application in that it is installed in each sensor 12 independently and processes the frequency value from the sensor independently.

The digital data output from the processor 16 is transmitted to the master processor 20 through the input interface 21 for outputting as numbers or graphs. The master processor 20 receives a digital signal corresponding to the strength of the magnetic field and calculates the strength of the magnetic field generated by the magnetic marker 1. The calculated value is displayed on the LCD display 14 in the form of numbers or graphs through the output interface 22 for driving the LCD display 14.

Meanwhile, the level of the device 10 is measured by the sensor of the level gauge 15 and transmitted to the master processor 20. The master processor 20 receives a digital signal corresponding to the horizontal level of the device, calculates the horizontal level of the device, and the user calculates the horizontal level on the LCD display 14 through the output interface 22. It is expressed in a format that can be recognized, such as a number or a graph, so that the user can determine the vertical state of the device.

In addition, the master processor 20 may be connected to the GPS receiver 23 and the external system connector 24. The GPS receiver 23 may receive the current location of the underground burial detector 10 through GPS. The received position information is processed and stored by the master processor 20. The external system connection unit 24 connects to an external computer, for example, the PDA 30 equipped with the GIS system, by wireless or wired, and inquires about the settings of the current measurement area. Meanwhile, the function of the GPS receiver 24 may be added to the PDA 30.

When the master processor 20 checks that the magnetic marker 1 is embedded, referring to the digital data output from the sensor 12, the master processor 20 receives the current position information from the GPS receiver and connects the external system connection unit 24. Through the GIS system 30 from the outside through the inquiry every setting corresponding to the current position to receive and refer to. In addition, the master processor 20 checks the location information for the underground buried by comparing the location and the location of the every setting beam, the format that the user can recognize the underground laying on the LCD display 14 through the output interface 22, For example, output in the form of characters or graphs.

In addition, the master processor 20, regardless of the presence or absence of the magnetic marker 1, the current location information received through the GPS receiver 23 or information on the underground buried material that the user wants to search, for example, the type and depth information of the magnetic marker Upon receipt, only this information can be output to the LCD display 14 in the form of text or graph.

Further, the digital data output from the master processor 20 is output according to the size of the digital data input via the output interface 26, for example, in the range of 0 to 2.5 V, in order to output the external audio having an intensity corresponding to the magnitude thereof. The analog signal is output through the speaker 13.

3 shows the structure of the fluxgate sensor 12 which is a magnetic field detection sensor according to an embodiment of the present invention.

As shown in FIG. 3, the fluxgate sensor 12 includes a magnetic iron core 122 which is periodically saturated by the drive coil 121, and a sense coil 120 that measures a magnetic field inside the coil. The drive coil 121 is wound around the magnetic iron core 122, and the sense coil 120 is wound around the drive coil 121 transversely.

In general, the sense coil 120 does not detect the magnetic field generated by the toroidal drive coil 121, but if an additional external magnetic field is applied, the pure magnetic field generated by the hysteresis of the drive coil 121 is sensed. Detected by the coil 120. With this special structure, the sensitivity to the external magnetic field is related to the direction of the sense coil 120.

The fluxgate sensor 12, which is a magnetic field detection sensor of this embodiment, is a commercially available sensor under the product name FGM-3. The sensor has a measurement range of ± 50 µT (± 0.5) and a resolution of about 10 nT (0.1 mG). Therefore, the fluxgate sensor 12 can detect a very small change in the magnetic field sensitively. However, since the underground buried detector 10 detects the difference between the magnetic fields measured by using four fluxgate sensors 12 different from each other, the linearity of the sensor is not so important. The output of the fluxgate sensor 12 is an easy-to-use 5V square wave whose frequency varies depending on the magnitude of the magnetic field where the fluxgate sensor 12 is located, usually from 50 kHz to 120 kHz (period T = 8.5 kHz to 25㎲) change.

Table 1 is a graph showing data values in kHz measured by the magnetic field generated from the magnetic marker buried in the ground by a detection rod of the detector according to the present invention, the sensor is installed at intervals as described above.

Table 1

Sensor 1 Sensor2 Sensor 3 (A value: Sensor 1-Sensor 2) <(B value: Sensor 2-Sensor 3) 44.36 44.10 43.43 0.26 <0.67 47.74 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

 First, referring to Table 1, the detector 10 is located at the position closest to the magnetic marker 1, which is a ferromagnetic material, according to the measurement distance (height) between the detection rod where the sensor is spaced apart from the magnetic marker 1, which is a ferromagnetic material. The first sensor 12a provided has the largest frequency value, the second sensor 12b installed next to the adjacent position has a frequency value of the next magnitude, and the third sensor 12c installed at the farthest position has the highest frequency value. It will have a small frequency value.

When analyzing the measured data, the measured value of the first sensor-second sensor, that is, the A value, represents the value smaller than the measured value of the second sensor-third sensor, that is, the B value, that is, the A value <B value. .

For example, since a frequency value of 44.36 kHz is measured at the first sensor and a frequency value of 44.10 kHz is measured at the second sensor, the A value becomes 0.26 kHz and the B value becomes 0.67 kHz, so that the A value <B value According to the experimental data, the inventors of the present invention determined that the measured object, for example, an object buried in the ground as a ferromagnetic material when A value <B value.

Meanwhile, the fourth sensor 12d adjacent to the third sensor 12c at the detection rod 11 and installed at the position farthest from the first sensor 12c is installed to secure the reliability of the detection. As the sensor, when the frequency value is smaller than the third sensor 12c, the detection object is determined as a ferromagnetic material.

That is, in the detector 10 of the present invention according to the preferred embodiment, when the value A is <B and the measured value of the fourth sensor 12d is smaller than the measured value of the third sensor, the measured object is a ferromagnetic material. You will be judged.

Table 2 shows magnetic fields generated from general metals (eg, gratings, menholes, reinforcing pipes), which are weak magnetic bodies, placed on the ground surface or in the ground by a detection rod of a detector according to the present invention, having the sensors spaced as described above. Is a graph showing data values measured in kHz.

TABLE 2

Sensor 1 Sensor2 Sensor 3 (A value: Sensor 1-Sensor 2)> (B value: Sensor 2-Sensor 3) Condition 55.38 46.08 43.31 9.30> 2.77 Grating 49.21 42.61 39.21 6.6> 3.4 Menhole 189.66 67.56 42.60 122.1> 24.96 Rebar tube

 Referring to Table 2, the detector 10 is the first installed in the position closest to the metal located in the ground, according to the measurement distance (height) between the weak magnetic material, which is a general metal body and the detection rod is located apart from the sensor The sensor 12a has the largest frequency value, has the next magnitude frequency value in the second sensor 12b installed in the adjacent position, and has the smallest magnitude in the third sensor 12c located in the farthest position. It will have a frequency value.

When the measured data is analyzed, the measured value of the first sensor and the second sensor, that is, the A value, represents the measured value of the second sensor and the third sensor, that is, a value larger than the B value, that is, the A value> B value. .

Accordingly, in the present invention, the above condition, that is, the case where A value> B value is determined as a weak magnetic material.

On the other hand, the present invention has described the state where the magnetic marker is installed while the north pole toward the ground surface as an example, in the case where the magnetic pole is installed while the south pole toward the ground surface, the sensor located at the far distance of the detection rod is the highest frequency The contents of the description referring to Table 1 and Table 2 are reversed, but the software in the device can be changed and processed, and the ferromagnetic material and the abbreviation are compared by comparing the difference values of the magnetic fields measured by each sensor, which is the technical idea of the present invention. The distinction of the Eucharist remains unchanged.

As described above, according to the present invention, by detecting the magnetic marker of the ferromagnetic material attached to the underground buried, such as water and sewage pipes, city gas supply pipes, electrical and communication lines, it is possible to effectively and accurately determine the location of the underground buried. This makes it easier to maintain underground structures and to easily supervise the poor construction of underground structures, as well as the risk of damage or damage to existing underground structures when installing new underground structures or constructing buildings. It is effective to lower back.

In addition, since the magnetic marker of the ferromagnetic material and the general metal body of the weak magnetic material can be easily distinguished, the magnetic marker can be accurately identified, and as a result, the location of the underground buried material can be accurately determined.

In addition, according to the present invention, by accurately recording and storing the current detected position using the GPS receiver and the PDA terminal, and in conjunction with the GIS system to query the buried information of the measurement area to compare in advance with the buried water location drawn by the measurement It can be easily linked with the underground burial management system that visually locates the buried material by drawing the result on the screen.

Claims (5)

In order to detect the magnetic field generated from the magnetic marker of the ferromagnetic material attached to the underground buried to measure the position of the underground buried more accurately, A detection unit comprising four first to fourth detection sensors which are sequentially spaced from the tip of the detection rod on a straight line of the axis of the detection rod facing the underground buried material, and a signal processing processor which processes the signals from the detection sensor in parallel; , In the underground buried detector comprising a master processor for determining the ferromagnetic and weak magnetic material in accordance with the signal from the detection unit, And the master processor compares detection results of the first to fourth sensors measured at different positions on the detection rod to determine the weak magnetic material and the ferromagnetic material. The method of claim 1, wherein the master processor, the difference between the measured value of the first sensor closest to the tip of the detection rod and the measured value of the second sensor adjacent to the first sensor and located farther from the tip than the first sensor ( A value) is smaller than the difference between the measured value of the second sensor and the measured value of the third sensor adjacent to the second sensor and located farther from the tip than the second sensor (B value) (A value <B value) Indicates a value, and determines that the ferromagnetic material is detected when the measured value of the fourth sensor that is adjacent to the third sensor and located farther from the tip than the measured value of the third sensor is smaller than the third sensor. Buried detectors. The method of claim 1, The underground buried detector, characterized in that it further comprises a horizontal sensor for detecting the vertical state of the detection rod. delete The method of claim 1, The master processor, LCD display 14 for outputting the image output from the master processor unit 20, Sound output means for outputting data output from the master processor 20 as sound; GPS receiver 32 for receiving the current position through the GPS input to the master processor, and It further includes an external system connection unit 24 for connecting the GIS information input from an external GIS system by wireless or wired, The master processor receives the digital data output from the detection unit, records and stores the position received from the GPS receiver 23, and inquires every setting report of the measurement area from an external GIS system, and converts the digital data into a number or graph. The underground burial detector, characterized in that for calculating the output or compare and retrieve the received position and the preset beams, and outputs the preset beams corresponding to the received position on the LCD display (14).

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