KR100947659B1 - Detecting apparatus for sensing buried magnetic substance and method for detecting buried magnetic substance by using the same - Google Patents

Abstract

PURPOSE: A detector for a buried objective and a method for detecting the buried objective using the same are provided to omit the correction process by comparing a detected magnetic flux density value from the detector to a reference value. CONSTITUTION: A theoretical value of a magnetic flux density is calculated according to the distance between a detection sensor and a magnetic marker(S41). A actual detected data is gathered(s42). A reference value of the magnetic flux density is saved in a master processor(S43). An experimental value of the magnetic flux density is saved in the master processor(S44). The difference between the reference value and the experimental value of the magnetic flux density is compared to a first tolerate value(S45). The existence of the magnetic marker is verified based on the comparison result(S46).

Description

Detecting apparatus for sensing buried magnetic substance and method for detecting buried magnetic substance by using the same

The present invention relates to an underground buried detector and a method for detecting underground buried materials using the same, and in particular, by comparing a measured value of magnetic flux density generated from a magnetic marker attached to the underground buried with a reference value previously input to the detector, The present invention relates to an underground buried detector capable of accurately calculating the depth of a distinctive magnetic marker, and an underground buried detection method using the same.

In the past, water and sewage, gas, electricity, and telecommunications facilities, which are indirect capital of society, were installed on the ground and supplied to homes or industrial sites. These facilities are essential for life and industry, and tend to be unplanned with the natural development of the community in the early stages of urbanization and industrialization. However, as these facilities are rapidly urbanized and industrial sites are clustered and concentrated, they are buried underground because of efficient use of space.

However, because the underground is not a visible space, it was very difficult to accurately identify and manage various buried materials buried underground. In addition, when the construction of new facilities or construction of buildings did not accurately grasp the facilities buried in the conventional underground, such constructions were destroyed, resulting in inconvenience of life, economic loss, and loss of life.

This accident originated from the failure to pinpoint the location of the deposit when the facility was constructed underground. In the case of underground buried material management, even if the design drawings are submitted as completed drawings or actual surveys, the drawings and the construction do not match, which leads to the misunderstanding of the location of the underground buried material, which leads to damage or explosion of the buried material during the excavation work. Occurred.

Therefore, there is a need for a method and apparatus for accurately detecting underground burial to prevent such accidents. Various detection methods such as electromagnetic induction, underground radar, sound waves, electromagnetic coils, or warning magnetic tapes are used for such detection methods. However, the conventional method has a problem that an error occurs in the position measurement because it is used after the underground buried material is completely buried. In addition, when the underground buried deep, there was a problem that the position measurement itself is impossible in the case of a low detectable depth method.

In order to solve these problems, the applicant of the present invention has disclosed a "underground buried detector equipped with a plurality of sensors" registered in Korea Patent Registration No. 10-0602525 (registered on July 11, 2006). The registered patent detects the magnetic field generated from the magnetic marker of the ferromagnetic material attached to the underground buried material and measures the first sensor closest to the tip of the detection rod and the first sensor adjacent to the first sensor so as to accurately measure the position of the underground buried material. The difference (A value) of the measured value of the second sensor located farther than the first sensor is the difference between the measured value of the second sensor and the measured value of the third sensor located farther than the second sensor at the distal end and adjacent to the second sensor. An underground burial detector is provided to detect ferromagnetic material when it is less than (B value) (A value <B value).

However, since the conventional underground buried detector uses a gradient meter (Gradiometer) for measuring the rate of change of the magnetic field, etc., there is a problem that a correction operation must be added to detect the location of the underground buried material.

In addition, while the conventional underground buried detector can detect the magnetic marker of the ferromagnetic material that is distinguished from the soft magnetic material, it also has a problem that it is difficult to detect the depth of the underground buried material.

An object of the present invention is to solve the problems described above, it is possible to accurately calculate the depth of the magnetic marker by comparing the measurement value of the magnetic flux density generated from the magnetic marker attached to the underground buried with the reference value previously input to the detector It is to provide an underground buried detector and a method for detecting underground buried using the same.

Another object of the present invention is to provide an underground buried detector and a method for detecting underground buried ground using the same because it does not use a gradient measuring device because it reads the measured value directly from the sensor.

According to the method of detecting the underground buried material according to an embodiment of the present invention to achieve the above object, i) a detection sensor and a magnetic marker for detecting the type of magnetic marker attached to the underground buried material and the strength of the magnetic field generated from the magnetic marker; Selecting and storing a reference value of the magnetic flux density according to the distance therebetween; ii) measuring and storing an actual value of the magnetic flux density generated from the exploration area using the detection sensor; Determining whether a difference between the measured value is within a first error value previously input to the master processor; and iii) a magnetic material distinguished from a soft magnetic material in an exploration area when the difference between the reference value and the measured value is within the first error value. Determining that the marker is present.

In addition, according to the method of detecting the underground buried material according to an embodiment of the present invention, after the step iii) to calculate the reference value of the magnetic flux density according to the corrected distance, iii) the magnetic flux that is determined to exist the magnetic marker Determining whether the difference between the measured value of density and the magnetic flux density reference value according to the corrected distance is within a second error value; and iii) if the difference between the measured value and the reference value is within a second error value in step iii). And determining the z value of the reference value as the depth at which the magnetic marker exists.

In addition, according to the method of detecting the underground buried material according to an embodiment of the present invention, the step iii) calculating the theoretical value (Bz) of the magnetic flux density according to the distance from the following equation, and between the detection sensor and the magnetic marker And collecting the actual field measurement data of the magnetic flux density according to the distance and selecting the reference value of the magnetic flux density according to the corrected distance by comparing and analyzing the theoretical value and the field actual measurement data.

[Equation]

In addition, according to the method of detecting the underground buried material according to an embodiment of the present invention, the step iii) calculating the theoretical value (Bz) of the magnetic flux density according to the distance from the equation of claim 3, the detection sensor and the magnetic Collecting field actual measurement data of magnetic flux density according to a distance between markers and comparing the theoretical value with the field actual measurement data to select a reference value of magnetic flux density according to a distance between the detection sensor and the magnetic marker; Characterized in that it comprises a step.

As described above, according to the underground buried detector and the underground buried detection method using the same according to the embodiment of the present invention, since the magnetic flux density value detected by the detection sensor is directly read and compared with the reference value, the correction operation is not performed using a conventional gradient measuring instrument. The effect of not performing is obtained.

In addition, according to the underground buried detector and the method of detecting underground buried using the same, according to the embodiment of the present invention, by directly comparing the reference value of the magnetic flux density and the value detected from the detection sensor to distinguish the soft magnetic material and the magnetic marker, the depth of the magnetic marker The effect that can accurately measure is obtained.

1 is a view schematically showing a method for detecting underground buried material according to an embodiment of the present invention.
2 is a block diagram of the underground buried detector according to an embodiment of the present invention.
3 is a diagram illustrating a magnetic marker according to an embodiment of the present invention.
Figure 4 is a flow chart for measuring the depth of the magnetic marker attached to the underground buried in accordance with an embodiment of the present invention.

The above and other objects and novel features of the present invention will become more apparent from the description of the specification and the accompanying drawings.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail according to drawing.

In addition, in description of this invention, the same code | symbol is attached | subjected to the same part and the repeated description is abbreviate | omitted.

1 is a view schematically illustrating a method for detecting underground deposits according to an embodiment of the present invention, and FIG. 2 is a block diagram of an underground deposit detector according to an embodiment of the present invention.

As shown in FIG. 1, the magnetic marker 1 is attached to underground deposits 18 such as water and sewage pipes, city gas supply pipes, and electric and communication lines. The magnetic marker 1 is made of a permanent magnet of a constant magnetic force, such as ferrite, waterproof, moisture-proof, nickel-plated or urethane film coating treatment as a permanent life. The magnetic marker 1 is usually installed so that the N pole is directed upward, but in some cases, the S pole may be installed upward.

Meanwhile, four magnetic field detection sensors, for example, fluxgate sensors 12a, 12b, 12c, and 12d, which are located inside the support rod 11 provided in the underground buried detector 10, measure magnetic fields. In this case, the present invention is described as having four magnetic field detection sensors, but it is preferable to have three or more magnetic field detection sensors according to the exploration environment or the area of underground buried materials. The fluxgate sensors 12a, 12b, 12c, and 12d are spaced apart from each other from the tip portion 11a facing the ground in the supporting rod 11. The fluxgate sensors 12a, 12b, 12c, and 12d are vector sensors and measure an average magnetic field component corresponding to each sensing axis.

The magnetic field data is processed by the master processor 20 of the underground buried detector 10 to be described later to generate an acoustic signal through the built-in speaker 13, or to form the LCD player 14 in the form of a numerical value or a graph. It is displayed or transmitted to a computer connected to the interface means, for example, a communication means 30 having a GPS function for processing. The communication means 30 may be adopted as a suitable means for connecting to the PDA, Ultra Mobile PC (UMPC) or the detector 10. In addition, the detector 10 is provided with a horizontal sensor 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 a horizontal sensor 15.

As shown in FIG. 2, four fluxgate sensors 12a, 12b, 12c, and 12d are provided on the support bar 11 so that the shafts are aligned. 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. Each of the fluxgate sensors 12a, 12b, 12c, and 12d measures the magnetic field generated by the magnetic marker 1 at its own position, and the measured magnetic field data is obtained from each of the sensors 12a, 12b, 12c, and 12d. The input signal is input to each of the signal processing processors 16a, 16b, 16c, and 16d installed in order to rapidly parallelize the signals of the signals.

The digital data output from the processors 16a, 16b, 16c, and 16d 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. 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 the communication means 30 provided with an external computer, for example, a GIS system, wirelessly or by wire, and inquires about every setting report of the current measurement area.

The construction of the underground buried detector is disclosed in detail in "Underground buried detector equipped with a plurality of sensors" registered by the applicant of the Korean Patent Registration No. 10-0602525 (registered on July 11, 2006). It will be omitted.

Next, with reference to Figures 3 and 4 will be described in detail underground detection method according to an embodiment of the present invention.

3 is a view showing a magnetic marker according to an embodiment of the present invention, Figure 4 is a flow chart for measuring the depth of the magnetic marker attached to the underground buried in accordance with an embodiment of the present invention.

3 and 4, the theoretical value of the magnetic flux density according to the distance is first calculated before detecting the magnetic marker 1 attached to the underground burial using the underground burial detector 10 (S41). In this case, the magnetic marker 1 has a cylindrical shape and can be manufactured in various types by adjusting the size of the height (L) and the radius (b). The magnetic flux density formed by the magnetic marker 1 is derived using well-known physical laws, and is derived as shown in Equation 1 below on the z-axis.

In this case, μo has a value of 4π × 10 ⁻⁷ H / m as the permeability of the vacuum, and Mo is the surface magnetic flux density Bo of the magnetic marker 1 according to the values of the height (L) and the radius (b). May be determined to be 1800G.

After the step S41, the field actual measurement data of the magnetic flux density according to the distance between the detection sensors 12a to 12d and the magnetic marker 1 is collected (S42). The field measurement data can be obtained by embedding the magnetic marker 1 in the soil according to the depth and measuring the magnetic flux density from the detection sensors 12a to 12d. In other words, the field actual measurement data is for each type of magnetic marker 1, for example L = 2cm, b = 2.5cm or L = 2.8cm, b from the detection sensors 12a-12d within the range of 0m to 5m. = 3.5 cm can be collected by measuring the magnetic flux density by varying the distance. The theoretical value measured in the steps S41 and S42 and the actual measurement data are compared and analyzed, and a reference value of the magnetic flux density according to the distance between the detection sensors 12a to 12d and the magnetic marker 1 is selected and the master processor 20 is selected. In step S43). Therefore, the master processor 20 may have magnetic flux density data according to the type of the magnetic marker 1.

After the step S43, the measured value of the magnetic flux density generated from the exploration area is measured using the detection sensor, and the measured value is stored in the master processor 20 (S44). In operation S44, it is determined whether the difference between the reference value stored in the master processor 20 and the measured value of the magnetic flux density is within the first error value previously input to the master processor 20 for each type of the magnetic marker 1 (S45). If the measured value of the reference value and the magnetic flux density is within the first error value in step S45, it is determined that the magnetic marker 1 distinguished from the soft magnetic material exists in the exploration area (S46). In other words, when the first error value is within the set range from the reference value, it may be determined that the magnetic marker 1 distinguished from the soft magnetic material exists in the exploration area. The first error value is preferably set differently according to the geology or the surrounding environment of the area where the underground buried material is buried.

For example, when the reference values of the magnetic flux densities stored in the first sensor 12a to the fourth sensor 12d are 50G, 30G, 20G and 10G, respectively, and the setting range of the first error value is set to 10%, If the measured magnetic flux density from the first sensor 12a to the fourth sensor 12d is 45G, 28G, 18G and 9G, respectively, the first error value corresponding to the difference between the reference value and the measured value is within 10%. It is judged that the magnetic marker (1) which is distinguished from the soft magnetic material is embedded in the exploration area.

On the contrary, if the reference value and the measured value exceed the first error value in step S45, the soft magnetic material and the magnetic marker 1 are not distinguished, and the flow returns to step S44 to continuously measure the measured magnetic flux density of the exploration area. The measured value is stored in the master processor 20.

On the other hand, the conventional underground buried detector to measure the rate of change of the magnetic field using a gradient meter (gradiometer) type of circuit called SCL007 has to perform a calibration (calibration). Therefore, the present invention has the advantage that it is not necessary to perform the correction operation as in the prior art because it is determined by the direct comparison of the measured value of the magnetic flux density with the reference value.

The reference value of the magnetic flux density according to the distance corrected after step S46 is calculated (S47). In more detail, first, the thickness (L), radius (b) and magnetization (Mo) values according to the type of the magnetic marker (1) by substituting the [Equation 1] magnetic flux density (Bz) according to the distance The theoretical value of is calculated, and field measurement data of magnetic flux density according to the distance between the detection sensors 12a to 12d and the magnetic marker 1 are collected. In this case, the reference value is preferably calculated while changing the distance z value within the range of 1 cm to 500 cm. Therefore, by correcting the theoretical value from the field actual measurement data, it is possible to calculate the reference value of the magnetic flux density according to the corrected distance.

In step S47, it is determined whether the difference between the reference value and the measured value of the magnetic flux density that is determined to be present in the magnetic marker 1 is within the second error value (S48). If it is determined in step S48 that the difference between the measured value and the reference value is within the second error value, the z value of the reference value is determined as the depth at which the magnetic marker 1 exists (S49). In more detail, the measured value of the magnetic flux density detected by the first sensor 12a to the fourth sensor 12d is compared with a reference value to detect a z value within a second error value, and to determine the z value. This is determined by the depth at which the magnetic marker 1 exists.

As mentioned above, although the invention made by the present inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

The present invention relates to an underground burial detector and a method for detecting underground burial using the same. Applications include water supply and sewage pipelines underground, KEPCO underground burial, city gas pipelines, and underground projects that bury communications and broadcast cables in the ground.

1: Magnetic marker 10: Detector
11: detection rod 12a, 12b, 12c, 12d: detection sensor
16a, 16b, 16c, and 16d: processors that process signals from sensors
16: master processor

Claims (4)

Iii) selecting a reference value of the magnetic flux density according to the distance between the magnetic marker and the type of magnetic marker attached to the underground buried material and the strength of the magnetic field generated from the magnetic marker and storing in the master processor;
Ii) measuring and storing the measured value of the magnetic flux density generated from the exploration area by using the detection sensor;
Determining whether a difference between the reference value and the measured value is within a first error value previously input to the master processor; And
Iii) determining that there is a magnetic marker in the exploration area that is different from the soft magnetic material if the difference between the reference value and the measured value is within the first error value. The method of claim 1,
After the above step iii)
Iii) calculating a reference value of magnetic flux density according to the corrected distance;
Determining whether the difference between the measured value of the magnetic flux density at which the magnetic marker is present and the magnetic flux density reference value according to the corrected distance is within a second error value; And
Iii) if the difference between the measured value and the reference value is within the second error value in step iv), determining the z value of the reference value as the depth at which the magnetic marker exists. Way. The method of claim 2, wherein step iii)
Calculating a theoretical value Bz of magnetic flux density according to a distance from the following equation;
Collecting field measurement data of magnetic flux density according to a distance between the detection sensor and the magnetic marker; And
And comparing the theoretical value with the field actual measurement data and selecting a reference value of the magnetic flux density according to the corrected distance.

[Equation]

The method of claim 1, wherein step iii)
Calculating a theoretical value Bz of magnetic flux density according to a distance from the equation of claim 3;
Collecting field measurement data of magnetic flux density according to a distance between the detection sensor and the magnetic marker; And
And comparing the theoretical value with the field actual measurement data and selecting a reference value of the magnetic flux density according to the distance between the detection sensor and the magnetic marker.

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