WO2023106418A1 - Système d'exploration magnétique - Google Patents

Système d'exploration magnétique Download PDF

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Publication number
WO2023106418A1
WO2023106418A1 PCT/JP2022/045564 JP2022045564W WO2023106418A1 WO 2023106418 A1 WO2023106418 A1 WO 2023106418A1 JP 2022045564 W JP2022045564 W JP 2022045564W WO 2023106418 A1 WO2023106418 A1 WO 2023106418A1
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data
waveform data
magnetic
waveform
exploration
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PCT/JP2022/045564
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English (en)
Japanese (ja)
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安志 狩俣
慶大 狩俣
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有限会社沖縄基礎開発
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Priority to JP2023519578A priority Critical patent/JPWO2023106418A1/ja
Publication of WO2023106418A1 publication Critical patent/WO2023106418A1/fr

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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

Definitions

  • the present invention relates to a magnetic exploration system that explores magnetic objects buried in the ground from the difference in magnetic field strength at two positions spaced apart on the exploration line.
  • a differential magnetic exploration device is a differential connection of two magnetic detection coils (magnetic sensor units) that detect the magnetism of a magnetic body, held at a constant interval in the internal space of a moving body, and The object is detected from the difference in strength of the magnetic field obtained by the coil.
  • the differential magnetic survey system utilizes this magnetic field difference and is configured to send a magnetic detection signal of a predetermined magnitude to the personal computer for the administrator.
  • the distance between two magnetic detection coils is 0.5 to 2 .0 m.
  • the present invention is intended to solve such problems, without securing human resources with specialized knowledge and experience necessary for analysis, immediately and automatically at the site after the search work or during the search work. It is an object of the present invention to provide a magnetic exploration system capable of identifying the presence or absence of an object.
  • a magnetic survey system of the present invention includes a moving body that moves on a linear survey line, a magnetic sensor unit provided on the moving body, and a data processing unit that processes detection signals from the magnetic sensor unit. and wherein the magnetic sensor unit has a plurality of magnetic sensors that detect magnetism at positions separated by a predetermined distance in the direction of movement of the moving body, wherein the data processing unit detects one of the magnetic an inversion calculation unit that adds the detection value of the sensor and the inverted detection value of the other magnetic sensor and outputs the result; and acquires and records the output value of the inversion calculation unit as time-dependent waveform data in association with the movement position.
  • a data recording unit a data evaluation unit that evaluates the reliability of the waveform data acquired by the data recording unit, and an exploration determination that determines an exploration result when the data evaluation unit determines that the reliability evaluation is high.
  • the data evaluation unit includes threshold comparison means for detecting an excess of the waveform data from a predetermined threshold; and an area for obtaining an excess area having a peak exceeding the predetermined threshold in the waveform data.
  • an acquisition means for counting the number of acquired excess areas, extracting and grouping ranges including these excess areas from the waveform data if the number of excess areas is equal to or less than a predetermined number, and counting the number of excess areas; and grouping means configured to divide the waveform data so that the waveform data is within a predetermined number when the number is larger than a predetermined number.
  • the data evaluation unit preferably has an area acquisition means for acquiring the excess area and a grouping means for appropriately extracting and grouping the range including the excess area from the waveform data. Only the waveform by the object can be extracted.
  • the magnetic prospecting system having the data evaluation unit can immediately and automatically detect the object to be searched at the site after the search work or during the search work without securing personnel with the specialized knowledge and experience necessary for analysis. It is possible to specify the presence or absence of
  • the data evaluation unit is configured to compare the grouped waveform data with preset reference waveform data, and detect that an approximate value between the reference waveform data and the waveform data is within a predetermined range.
  • a comparison means is provided.
  • distance confirmation means configured to detect that a distance between vertexes of the waveform data in the excess area acquired by the area acquisition means is within a predetermined distance corresponding to the distance between the magnetic sensors; is preferred.
  • the region acquiring means acquires waveform difference data, which is a difference between each point constituting the waveform data and its adjacent points, from the waveform data, and corresponds to a position where the difference is 0 in the waveform difference data.
  • a point of the waveform data at a position where the difference is 0 is obtained as a vertex, and a point of the waveform data at a position where the gradient of the waveform difference data before and after the position where the difference is 0 changes by a predetermined value or more is obtained as a change point. It is preferably arranged to obtain and define a region containing these vertices and change points as said excess region.
  • the area acquisition means is configured to define a continuous area exceeding a predetermined threshold adjacent to a position where the acquired waveform data exceeds the predetermined threshold as the excess area.
  • the threshold comparing means is configured to set the predetermined threshold of the waveform data as a predetermined value based on a moving average value of the waveform data.
  • the predetermined number in the grouping means is preferably four.
  • the grouping means preferably detects that the change point is within a predetermined range from a position where the difference in the waveform difference data is 0.
  • an object to be explored can be automatically and immediately identified at the site after or during exploration work without securing personnel with specialized knowledge and experience necessary for analysis. It is possible to provide a magnetic exploration system capable of
  • Explanatory drawing of the magnetic investigation system which is Embodiment 1 of this invention Explanatory drawing of the waveform data measured with a magnetic prospecting system. Explanatory drawing of the waveform which has a peak once in the upper and lower sides. Explanatory diagram of a waveform having two upper peaks and one lower peak. Explanatory diagram of waveform data including waveform difference data (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. (1) to (3) Explanatory diagrams showing reference waveform data. Explanatory drawing of the waveform data by the magnetic investigation system which is Embodiment 2 of this invention.
  • the magnetic exploration system 100 includes a moving object 110 that moves along a linear exploration line, a magnetic sensor unit 111 provided on the moving object 110, and detection from the magnetic sensor unit 111. and a data processing unit 120 for processing the signals.
  • the magnetic sensor unit 111 has a plurality of magnetic sensors 112 that detect magnetism at positions separated by a predetermined distance in the moving direction of the moving body 110 .
  • the magnetic sensor unit 111 has two magnetic sensors 112, namely, a magnetic sensor 112a on the leading end side in the movement direction and a magnetic sensor 112b on the trailing end side.
  • the magnetic sensor 112a and the magnetic sensor 112b are provided at positions separated from each other by a predetermined distance (eg, 1 m in this embodiment), and each detect magnetism at a predetermined cycle. Both the magnetic sensors 112a and 112b detect magnetism, but the magnetic flux density, magnetic field strength, etc. vary depending on the specifications of the magnetic sensors.
  • the data processing unit 120 includes an inversion calculation unit 121 that adds (synthesizes) and outputs the detection value of the two magnetic sensors 112a and the inversion value of the detection value of the magnetic sensor 112b that are separated by a predetermined distance, and an inversion calculation unit.
  • a data recording unit 122 that associates the output value of 121 with the position information of the magnetic sensor unit 111 and records it as waveform data over time, a data evaluation unit 130 that evaluates the waveform data, and the reliability of the data evaluation unit 130 and an exploration judgment processing unit 123 for judging the exploration result when it is judged that the property evaluation is high.
  • the search determination processing unit 123 and the data evaluation unit 130 will be described later.
  • the waveform data obtained by the data recording unit 122 based on the detection values of the two magnetic sensors 112a and 112b will be described below.
  • Fig. 2 shows a data acquisition screen as an example of waveform data, the arrangement of exploration targets (magnetic objects) A and B, and their magnetic lines of force in the case of waveform data.
  • the position of the waveform data matches the position of the object.
  • the moving body 110 is moved from left to right in FIG. 2 on a straight search line.
  • two magnetic sensors 112 a and 112 b of the magnetic sensor unit 111 provided on the moving body 110 detect magnetism at regular intervals, and the detected values are input to the inversion calculation section 121 of the data processing unit 120 .
  • the inversion value of the detection value of the magnetic sensor 112b is added (synthesized) with the magnetic sensor 112a.
  • detected values dependent on the geomagnetism and the environment are canceled out at positions where the magnetism of the object to be explored is not detected, so much noise is removed from the waveform data obtained by the data recording unit 122 .
  • the detected values of the two magnetic sensors 112a and 112b are phase-shifted according to the physical distance between the magnetic sensors 112a and 112b.
  • the detection value of the magnetic sensor 112b is inverted by the inversion calculation unit 121, so that the respective waveform data are opposite to each other in plus and minus.
  • the magnetic field on the tip side as shown in FIG. 2 when moving in the vicinity of a comparatively small exploration object A magnetized in a direction parallel to the moving direction of the moving object, the magnetic field on the tip side as shown in FIG.
  • the value detected by the sensor 112a increases toward the positive side as it approaches the exploration object, and becomes a waveform having one peak on the positive side.
  • the detected value of the magnetic sensor 112b on the rear end side is inverted, after the phase is shifted by the interval, the detected value by the magnetic sensor 112a increases to the negative side as it approaches the exploration object. It becomes a waveform having one peak with the same amplitude as .
  • the post-calculation waveform data output from the inversion calculation unit 121 exhibits a waveform having one peak each in the upper and lower directions.
  • the moving body moves in the vicinity of a comparatively large magnetic exploration object B in a direction perpendicular to the moving direction, as shown in FIG. After having a peak, it is reversed to form a waveform having a negative peak, and the value detected by the magnetic sensor 112b on the rear end side is reversed after the phase is shifted by the interval. Therefore, the waveform data after the calculation output from the inversion calculation unit 121 shows a waveform having two upper peaks and one large lower peak sandwiched between them. It will happen.
  • the waveform data after calculation is associated with the position information, thereby acquiring the waveform data indicating the magnetic detection value with respect to the position.
  • the reliability of the obtained waveform data is evaluated by the data evaluation unit 130 (described later). Then, when the data evaluation unit 130 evaluates that the reliability of the obtained waveform data is high, the search determination processing unit 123 detects changes in the grouped waveform data extracted from the waveform data in the data evaluation unit 130. From the points and vertices, the position, size, etc. of the object to be explored are specified.
  • the data processing unit 120 is connected to an input/output device 140 such as a PC used for operation, display, and the like.
  • an input/output device 140 such as a PC used for operation, display, and the like.
  • the data processing unit 120 and the input/output device 140 may be configured entirely as a single device or may be separate devices. good.
  • the data processing unit 120 and the input/output device 140 may all be located at the search work site, or may be located at different locations and arranged to communicate by wire or wirelessly.
  • data evaluation unit 130 by having the data evaluation unit 130, data can be analyzed at the site after or during the search work without securing personnel with specialized knowledge and experience necessary for analysis. can be evaluated appropriately, and if the data is highly reliable, the object to be explored can be immediately and automatically specified.
  • the data evaluation unit 130 will be described in detail below.
  • the data evaluation unit 130 includes a threshold comparison unit 131 for detecting an excess of the waveform data input to the data evaluation unit 130 from a predetermined threshold, and an area acquisition unit for acquiring an excess area having a peak exceeding the predetermined threshold in the waveform data. 132, the number of acquired excess regions is counted, and if the number of excess regions is equal to or less than a predetermined number, the range including these excess regions is extracted from the waveform data and grouped, and the number of excess regions is greater than the predetermined number. If the number is large, the distance between the peaks of the waveform data in the excess area acquired by the grouping means 133 configured to divide the waveform data within a predetermined number and the area acquisition means 132 is determined by the magnetic field.
  • a distance confirmation means 134 for detecting that the sensors 112a and 112b are within a distance corresponding to a predetermined distance compares the grouped waveform data with reference waveform data that is provided in advance, and compares the reference waveform data with the waveform data. is within a predetermined range, the reliability of the acquired waveform data is evaluated highly.
  • the data evaluation unit 130 can appropriately group only the waveforms corresponding to the exploration object from the data, and further evaluate the data in that case to evaluate whether the reliability of the waveform data is high. Therefore, the exploration system of the present embodiment automatically detects the presence or absence of the exploration object immediately after or during the exploration work without securing personnel with specialized knowledge and experience necessary for analysis. can be specified.
  • a predetermined threshold value for the detection value is set in the threshold comparison means 131 .
  • the value of this predetermined threshold can be set as appropriate. It is conceivable that some kind of magnetic object exists at the position corresponding to the point where the predetermined threshold is exceeded, and if a waveform peak that does not exceed the predetermined threshold is detected, it is considered to be noise such as geomagnetism that is not targeted for exploration. be done. Therefore, in this embodiment, the threshold comparing means 131 determines whether or not the detected value of the waveform data exceeds this predetermined threshold. In the example shown in FIG. 5, each detected value exceeds the predetermined threshold, so the threshold comparing means 131 determines that the waveform data exceeds the predetermined threshold.
  • the area acquisition means 132 detects an excess area having a peak in which the detection value exceeds a predetermined threshold in the waveform data.
  • the area obtaining means 132 first obtains waveform difference data of waveform data.
  • the waveform difference data is data consisting of the difference between the detected value of each point constituting the waveform data and its adjacent points, that is, the detected value at the position n of the waveform data and the position n- This is data obtained by using the difference from the detection value at 1 as the difference value at a certain position n. Therefore, as shown in FIG. 5, in the waveform difference data, the value changes depending on whether the peak of the waveform data rises or falls.
  • the region acquisition unit 132 detects the peaks (X1, X2) of the waveform at positions where the detected value exceeds a predetermined threshold and the difference in the waveform difference data is 0.
  • the region obtaining means 132 extracts a point corresponding to a point where the gradient of the waveform difference data changes by a predetermined value or more while exceeding the difference value threshold value of the waveform difference data. It is determined to be the root of the data peak (portion with large positive/negative amplitude), and is acquired as a change point (X11, X12, X21, X22). Note that the difference value threshold of the waveform difference data can be appropriately set in consideration of environmental factors and the like.
  • the peak vertices (X1, X2) and change points (X11, X12, X21, X22) of these detected values constitute peaks of the waveform data.
  • the area acquisition means 132 sets the first three points as one peak (excess area), sets the next three points as another peak, and sets the excess areas Z1 and Z2 including the respective peaks. Note that this gradient can be set as appropriate.
  • the grouping means 133 first confirms the number of peaks, and if the number is within a predetermined number (4 in this embodiment), it is set as one group. For example, in the case shown in FIG. 5, the number of peaks is 2, which is within the predetermined number. Therefore, these two peaks are collectively set as one group.
  • the grouping means 133 confirms (counts) the number of peaks, and if the number exceeds a predetermined number, a plurality of peaks are collectively divided into a plurality of groups. For example, in the case shown in FIG. 2, the number of peaks is five. In this case, since the number of peaks is greater than the predetermined number of four, they are divided into two groups, which corresponds to the two probe objects in the case shown in FIG. That is, the predetermined number is preferably 4 based on the results of the following reference waveform data, etc. If it exceeds 5, it means that there are a plurality of exploration targets.
  • the distance confirmation means 134 detects that the distance between the vertices of the waveform data is within a predetermined distance corresponding to the distance between the magnetic sensors.
  • the distance between the vertices ideally matches the distance between the magnetic sensors 112a and 112b, but it is conceivable that they may not match due to an error during measurement. Therefore, in this embodiment, the predetermined distance is a distance of 0.5D to 1.5D with respect to the distance D between the magnetic sensors 112a and 112b. It is set as a predetermined distance corresponding to the distance between. It should be noted that the predetermined distance corresponding to the distance between the magnetic sensors 112a and 112b can be appropriately set according to the situation. If the distance between the vertices of the waveform data is within a predetermined distance corresponding to the distance between the magnetic sensors, the reliability of the obtained waveform data is high.
  • the data evaluation unit 130 evaluates the waveform data as having low reliability.
  • the comparing means 135 compares the grouped waveform data with the reference waveform data that is provided in advance.
  • the waveform data is compared with reference waveform data registered in advance, and if there is waveform data close to the acquired waveform data, it is selected as comparison waveform data. If the approximate value between the comparison waveform data and the waveform data is within a predetermined range, the data evaluation section 130 determines that the waveform data is highly reliable.
  • reference waveform data there are various patterns with different numbers of peaks, different directions, and different sizes depending on the size and direction of the object to be investigated, the distance from the search line, and the like.
  • Figure 6 (1) to (3) show the case where one small exploration object (up to about 0.5 m in length) exists parallel to the direction of movement, and (1) When the distance from the measurement position to the exploration target is short ( ⁇ less than about 0.3m), (2) is the middle distance from the measurement position to the exploration target (less than 0.3 to about 0.6m) In some cases, (3) indicates a case where the distance from the measurement position to the object to be explored is long (about 0.6 to about 1.5 m).
  • Figure 7 (1) to (3) show the case where one object of medium size (less than 0.5 to 1.5 m in length) exists parallel to the direction of movement. , (1) is when the distance from the measurement position to the exploration target is short, (2) is when the distance from the measurement position to the exploration target is medium, and (3) is the distance from the measurement position to the exploration target. Indicates the case where the distance is long.
  • Figure 8 (1) to (3) show the case where one large exploration object (1.5 to less than 3.0 m in length) exists parallel to the direction of movement, ( 1) is when the distance from the measurement position to the exploration target is short, (2) is when the distance from the measurement position to the exploration target is medium, and (3) is when the distance from the measurement position to the exploration target is long. Indicates the far case.
  • Figure 9 (1) to (3) show the case where one small exploration object exists so as to be perpendicular to the movement direction, and (1) is the distance from the measurement position to the exploration object. (2) indicates that the distance from the measurement position to the investigation object is medium, and (3) indicates the case that the distance from the measurement position to the investigation object is long.
  • Figure 10 (1) to (3) show the case where one medium-sized object to be explored exists so as to be perpendicular to the moving direction. (2) indicates a medium distance from the measurement position to the investigation object, and (3) indicates a long distance from the measurement position to the investigation object.
  • Figure 11 (1) to (3) show the case where one large-sized exploration object exists so as to be perpendicular to the movement direction, and (1) is the distance from the measurement position to the exploration object. (2) indicates that the distance from the measurement position to the investigation object is medium, and (3) indicates the case that the distance from the measurement position to the investigation object is long.
  • FIGS. 6 to 11 From FIGS. 6 to 11, it can be seen that the larger the size of the object to be explored, the wider the width of the peak of the waveform, and the further the distance from the measurement position to the object to be investigated, the smaller the amplitude of the peak. Also, comparing FIGS. 6 to 8 with FIGS. 9 to 11, when the object to be investigated is horizontal with respect to the direction of movement, the lines of magnetic force and the direction of movement coincide, so there are two peaks in the waveform data. However, if the object to be explored is perpendicular to the moving direction, the lines of magnetic force and the moving direction are perpendicular to each other, so there will be four peaks. When it is large, the number of peaks becomes three because two peaks in the middle overlap each other.
  • the comparing means 135 compares the grouped waveform data with the reference waveform data that is provided in advance. Then, the comparing means 135 compares the waveform data with pre-registered reference waveform data, and determines whether the reference waveform data has the same number of peaks as the number of peaks in the group, based on the width, amplitude, etc. of the peaks. , to select the closest data. If there is waveform data close to the obtained waveform data, the comparison means 135 selects it as comparison waveform data, and determines whether the approximate value between the comparison waveform data and the waveform data is within a predetermined range. In this case, the approximate value can be calculated by a known method.
  • data evaluation section 130 determines that the waveform data is reliable data. If the comparison waveform data cannot be selected or if the approximate value is not within the predetermined range, the data evaluation unit 130 evaluates the waveform data as having low reliability.
  • This embodiment has an area acquisition means that differs in its configuration and operation from the area acquisition means 132 of the data evaluation unit 130 of Embodiment 1, and the other points are the same, so the different points will be described.
  • the area obtaining means detects the distance from the position exceeding the predetermined threshold of the obtained waveform data to the adjacent position exceeding the predetermined threshold, and the detected distance is the distance between the magnetic sensors.
  • a continuous region between corresponding predetermined distances is defined as the excess region.
  • a continuous excess area Z3 from the position (Y1) where the acquired waveform data exceeds the predetermined threshold to the adjacent position (Y2) where the predetermined threshold is exceeded is acquired.
  • the distance confirming means 134 further acquires that the excess area Z3 and the adjacent excess area Z4 are within a predetermined distance corresponding to the distance between the magnetic sensors. That is, the area acquisition means acquires the maximum value or minimum value in each area as a vertex, and the distance confirmation means 134 determines whether the distance of this vertex is within a predetermined distance corresponding to the distance between the magnetic sensors. is preferably configured to detect This is because, as in the first embodiment, the reliability of the acquired waveform data can be confirmed.
  • the grouping means 133 counts the number of consecutive regions in the same manner as the number of peaks in the first embodiment, and groups the series of data into one group if the number is within a predetermined number. , and if the number exceeds a predetermined number, the series of data is divided.
  • the grouping means 133 counts the number of consecutive regions in the same manner as the number of peaks in the first embodiment, and groups the series of data into one group if the number is within a predetermined number. , and if the number exceeds a predetermined number, the series of data is divided.
  • Embodiments 1 and 2 explained the case where the detected value depending on the geomagnetism and the environment is canceled at a position where the magnetism of the object to be explored is not detected and indicates a zero value.
  • a moving average value may be defined as a zero value. Even if the detection values that depend on the geomagnetism and the environment are not offset by the reversal calculation at the position where the magnetism of the object to be searched is not detected, the detection values that depend on the geomagnetism and the environment can be suppressed by calculating the moving average. , it is possible to obtain detection values that are more accurately dependent on the probed object.
  • the threshold value comparison means 131 may obtain a moving average value from the input waveform data, and set positive and negative threshold values for this moving average value.
  • the processing by the exploration determination processing unit 123 may be performed for each exploration line, or may be collectively performed for each site having a plurality of exploration lines.
  • the exploration determination processing unit 123 specified the exploration object using the vertices and the change points obtained in the data evaluation unit 130, it is not limited to this, and the waveform data in the data evaluation unit 130 is highly reliable.
  • the waveform data recorded in the data recording unit 122 may be used for exploration.
  • the region acquisition means 132 detects the point at which the differential waveform data value is 0 as the apex of each peak. Instead, points where the differential waveform data value is 0 are detected even in valleys between peaks. That is, in this case, three points where the difference of the differential waveform data becomes 0 in the region exceeding the differential value threshold are detected.
  • the region obtaining means 132 is configured so that, in a region where the waveform data exceeds a predetermined threshold value on the positive side and the difference of the differential waveform data exceeds the differential value threshold value, the difference of the differential waveform data changes from positive to Obtain the position of the waveform data corresponding to the point where it becomes 0 when changing to negative, and in the region where the waveform data exceeds a predetermined threshold on the negative side and the difference of the difference waveform data exceeds the difference value threshold, the difference waveform It may be configured to acquire the position of the waveform data corresponding to the point where the data difference changes from minus to plus and becomes 0.
  • the distance confirmation means 134 confirms whether the distance between the vertices is within a predetermined distance corresponding to the distance between the magnetic sensors. To do so, it is necessary to detect peaks with similar amplitudes on the positive and negative sides. Therefore, when there are a plurality of peaks on the positive side and the negative side, the area acquisition means 132 acquires the peak with the largest amplitude among the vertices of those peaks as the maximum apex, and the distance confirmation means 134 detects whether the distance between the maximum vertices is within a predetermined distance corresponding to the distance between the magnetic sensors.
  • the magnetic sensor 112 may be a two-dimensional or three-dimensional magnetic sensor, and the aforementioned calculation, grouping, comparison, etc. may be performed in each dimension.
  • the predetermined threshold value and the predetermined distance may be set to appropriate values by the input/output device 140 according to the type of the object to be investigated and the conditions of the investigation site.
  • magnetic investigation system 111 magnetic sensor unit 110 moving body 112a, 112b magnetic sensor 112a, b magnetic sensor 120 data processing unit 121 inversion operation unit 122 data recording unit 123 exploration judgment processing unit 130 data evaluation unit 131 threshold comparison means 132 area acquisition means 133 grouping means 134 distance confirmation means 135 comparison means 140 input/output device

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Abstract

Le but de la présente invention est de fournir un système d'exploration magnétique (100) qui peut identifier automatiquement et immédiatement la présence ou l'absence d'un objet d'exploration au niveau d'un terrain après ou pendant un travail d'exploration sans recourir à des personnes compétentes disposant de la connaissance et de l'expérience experte requise pour l'analyse. Une unité de capteur magnétique (111) comporte une pluralité de capteurs magnétiques (112a, 112b) qui détectent le magnétisme à des emplacements séparés d'une distance prescrite dans une direction de déplacement d'un corps mobile. Une partie évaluation de données (130) d'une unité de traitement de données (120) comprend un moyen d'acquisition de région (132) permettant d'acquérir des régions excessives dans des données de forme d'onde comprenant des pics dépassant un seuil prescrit, et un moyen de regroupement (133) permettant de compter le nombre des régions excessives acquises, d'extraire des données de forme d'onde et de grouper une plage comprenant les régions excessives si le nombre desdites régions excessives est inférieur ou égal à un nombre prescrit, et de diviser les données de forme d'onde de telle sorte que le nombre des régions excessives devienne inférieur ou égal au nombre prescrit si le nombre des régions excessives est supérieur au nombre prescrit.
PCT/JP2022/045564 2021-12-09 2022-12-09 Système d'exploration magnétique WO2023106418A1 (fr)

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