CN110687609B - Method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines - Google Patents
Method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines Download PDFInfo
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Abstract
The invention discloses a method for eliminating parallel pipeline interference in buried pipeline alternating current and direct current stray current detection, and relates to the technical field of detection. The invention has the beneficial effects that: the invention provides two sets of three-magnetic saturation magnetometer probe arrays for detecting a magnetic field generated by parallel pipeline current, realizes calculation and elimination of an external stable magnetic field and interference of the parallel pipeline current and the magnetic field, and can realize pipeline buried depth detection and current detection in parallel pipelines on the basis. Furthermore, the detection of alternating current and direct current mixed stray current in the pipeline is realized, and alternating current and direct current stray current are separated, so that the interference condition of the pipeline caused by the alternating current interference source and the direct current interference source is evaluated respectively.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method for eliminating interference of a parallel pipeline in buried pipeline alternating current and direct current stray current detection.
Background
At present, buried pipelines are increasingly interfered by alternating current and direct current stray currents, huge economic loss and potential safety hazards are caused to electrochemical corrosion of oil pipelines, and effective detection of the alternating current and direct current stray currents of the buried steel pipelines is an important measure related to safe operation of the pipelines. When the electromagnetic method is used for carrying out non-contact measurement on the stray current of the buried pipeline, the method for eliminating the external electromagnetic field is particularly important for accurately detecting the stray current.
There have been some detection methods for current detection in buried pipelines. The most direct detection method is to take a section of pipeline with a length to calibrate the longitudinal resistance of the pipeline and then take the potentials of the two points to reflect the magnitude of the stray current in the pipeline. The method is simple and direct, but the method needs to be provided with a preset electric connection point with the pipeline during detection, and the current in the pipeline at each position cannot be detected in a portable mode. Meanwhile, the excavation of pipelines buried underground is complex, and the method has large workload during testing. This method is not widely used. The pipe-to-ground potential is usually used as a detection parameter to reflect the interference level of the alternating current and direct current stray current in the pipeline, the limit value of the pipe-to-ground potential is also regulated in the relevant standards, but the pipe-to-ground potential is an indirect parameter and cannot directly and quantitatively reflect the magnitude of the alternating current and direct current in the pipeline. Because the pipeline diameter is big and difficult excavation, relevant hall current sensor can't effectively be applied to in the pipeline alternating current-direct current detects. In addition, there is a certain application example for detecting the current in the pipeline by using the magnetometer probe. The method for detecting the stray current in the pipeline needs to consider the following problems: (1) the buried depth of the buried pipeline is not fixed, so the distance between the magnetometer probe and the pipeline is unknown, and the buried depth of the pipeline at the detected position needs to be judged by using a detection signal. (2) When a magnetometer is used for detecting a magnetic field generated by current in a pipeline, the detected magnetic field is not only generated by the current in the pipeline, but also has magnetic field interference of a parallel pipeline, geomagnetic field interference and the like, and how to avoid the interference of a peripheral electromagnetic field is the key for accurately detecting stray current in the pipeline. (3) The arrangement method of the magnetometer probe is particularly important for eliminating other magnetic field interference during detection of pipeline stray current, and a correct and effective arrangement method is determined. (4) At present, the types of interference sources of pipelines are increased, direct current interference, power frequency alternating current interference, low-frequency alternating current interference and the like exist, in the existing method for detecting the pipeline current by utilizing a magnetometer probe, only direct current interference is generally involved, and the two types of interference can not be separated after the alternating current and direct current mixed interference is synchronously tested, so that the influences of different types of interference sources on the pipelines can be respectively evaluated, and therefore, the detection and separation of the alternating current and direct current mixed interference of the buried pipeline can be realized. The invention relates to a method for eliminating the magnetic field interference of a parallel pipeline in the detection process of the alternating current and direct current stray current of a buried pipeline by using a probe array of a magnetic saturation magnetometer, thereby realizing the accurate detection of the alternating current and direct current mixed current in the pipeline.
The invention discloses a method for measuring buried depth of a buried pipeline, stray current and a geomagnetic azimuth angle, which is applied under the patent number 201110097516.9, and ignores the influence of other electromagnetic fields vertical to a ground component during measurement, wherein in practice, the geomagnetic field has the component vertical to the ground, and meanwhile, the external magnetic field interference also has the component vertical to the ground, so that the existing method has larger error when detecting the electromagnetic field generated by the stray current of the buried pipeline. And the invention does not relate to a method for eliminating the interference of the stray current of the parallel pipeline.
Disclosure of Invention
In order to achieve the above object, the present invention provides a method for eliminating interference of a parallel pipeline in a buried pipeline ac/dc stray current detection.
By utilizing two sets of three-magnetic saturation magnetometer probe arrays, the magnetic field interference of a parallel pipeline and the external stable magnetic field interference are eliminated when the alternating current and direct current stray current of the pipeline is detected, so that the method for accurately detecting the stray current in the lower pipe of the parallel pipeline is provided.
The technical proposal is that a method for eliminating the interference of parallel pipelines in the detection of the alternating current and direct current stray current of buried pipelines,
s1, selecting the position of the parallel buried pipeline to be detected;
s2, each pipeline corresponds to three magnetometer probes, and the three magnetometer probes are sequentially and horizontally arrayed at equal intervals on the ground surface where the corresponding buried pipeline is located;
two parallel pipelines, one pipeline corresponds to the first probe, the second probe and the third probe; the second pipeline corresponds to the fourth probe, the fifth probe and the sixth probe;
s3, when alternating current and direct current stray currents exist in the pipeline, the six probes respectively detect magnetic fields at respective positions;
s4, obtaining the vertical component of the external stable magnetic field interference according to the detection result of S3, and eliminating the vertical component influence of the external stable magnetic field interference;
s5, according to the results of S3 and S4, the buried depth of the pipeline is calculated;
s6, obtaining the current of the pipeline under the magnetometer probe array according to the buried depth of the pipeline obtained in the step S5;
and S7, the current obtained according to the S6 comprises both the direct current in the pipeline and the alternating current in the pipeline, and the direct current in the detected current is separated from the alternating current, so that the detection and the separation of the alternating current and direct current stray current in the buried pipeline can be realized.
Preferably, when the probe array is placed in S2, the first pipeline is located right below the middle of the horizontal connecting line of the second probe and the third probe, and the projection of the horizontal connecting line between the second probe and the third probe on the horizontal plane is perpendicular to the projection of the central axis of the first pipeline on the horizontal plane; the first probe is positioned on an extension line of a horizontal connecting line of the second probe and the third probe, and the first probe is positioned on one side far away from the second pipeline;
the second pipeline is positioned right below the middle part of the horizontal connecting line of the fourth probe and the fifth probe, and the projection of the horizontal connecting line between the fourth probe and the fifth probe on the horizontal plane is vertical to the projection of the central axis of the second pipeline on the horizontal plane; and the probe six is positioned on an extension line of a horizontal connecting line of the probe four and the probe five, and the probe six is positioned on one side far away from the pipeline one.
Preferably, the magnetometer probe in S2 is a high-frequency three-axis magnetic saturation magnetometer probe.
Preferably, in step S4, the magnetic field strength of each probe is decomposed into a vertical component, a horizontal component and a pipeline axial component, the vertical component detected by the probe includes a vertical component of an external interference magnetic field, and the magnetic field is positive in a vertical downward direction:
H1 hang down＝-H11 droop-H21 hang down+HExternal droop；
H2 hang down＝-H12 droop-H22 droop+HExternal droop；
H3 hang down＝H13 hang down-H23 droop+HExternal droop；
H4 hang down＝H14 droop-H24 droop+HExternal droop；
H5 hang down＝H15 hang down+H22 droop+HExternal droop；
H6 hang down＝H16 hang down+H26 hang down+HExternal droop；
Wherein HExternal droopIs the vertical component of the external steady magnetic field; h1 hang down～H6 hang downThe magnetic field components of the positions, which are respectively obtained by detecting the first probe to the sixth probe, are vertical to the ground; h11 droop～H16 hang downThe magnetic field vertical ground components of the current in the first pipeline at the positions from the first probe to the sixth probe respectively correspond to the magnetic field vertical ground components; h21 hang down～H26 hang downThe magnetic field vertical ground components of the current in the second pipeline at the positions from the first probe to the sixth probe respectively;
the calculation formula of the relationship between the magnetic induction intensity and the current carrying size in the peripheral tangent direction of the long and straight current carrying conductor is as follows:
the calculation formula of the relationship between the magnetic field strength and the current carrying size in the peripheral tangent direction of the long straight current carrying conductor is as follows:
thus, the vertical component of the external interference magnetic field and the vertical component of the pipeline to be tested after the external interference magnetic field is eliminated can be obtained;
assuming that the first pipeline is a pipeline to be detected, obtaining the current of the first pipeline under the magnetometer probe array as follows:
assuming that the second pipeline is a pipeline to be tested, obtaining the current of the second pipeline under the magnetometer probe array as follows:
preferably, according to the electromagnetic field detection results of the three probe arrays, according to the formula:
wherein d is1Is the burial depth of the first pipeline11、r12And r13The linear distances between the first probe, the second probe and the third probe and the axis of the first pipeline are respectively;
wherein d is2Is the burial depth of the first pipeline24、r25And r26The linear distances between the probe four, the probe five and the probe six and the axis of the pipeline two are respectively.
Preferably, the parameters detected by the probe II satisfy the following conditions:
the parameters detected by the first probe satisfy the following conditions:
this gives:
the parameters detected by the probe five meet the following conditions:
the parameters detected by the probe six meet the following conditions:
this gives:
preferably, the following calculation method is used to eliminate the horizontal component interference:
wherein H11 flat、H12 pingThe horizontal components of the magnetic field intensity detected by the first probe and the second probe are respectively; h25 ping、H26 pingThe horizontal components of the magnetic field intensity detected by the probe five and the probe six are respectively;
at this time:
this gives:
preferably, the distance l between each magnetometer probe is 0.4 m.
Preferably, the frequency is greater than 1 kHz.
Preferably, the selected magnetometer is a three-component magnetic saturation magnetometer.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the invention provides two sets of three-magnetic saturation magnetometer probe arrays for detecting a magnetic field generated by parallel pipeline current, realizes calculation and elimination of an external stable magnetic field and interference of the parallel pipeline current and the magnetic field, and can realize pipeline buried depth detection and current detection in parallel pipelines on the basis. Furthermore, the detection of alternating current and direct current mixed stray current in the pipeline is realized, and alternating current and direct current stray current are separated, so that the interference condition of the pipeline caused by the alternating current interference source and the direct current interference source is evaluated respectively.
Drawings
FIG. 1 is a schematic diagram of a method for eliminating magnetic field interference of stray currents in parallel pipelines according to an embodiment of the present invention
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
The invention provides a method for eliminating interference of parallel pipelines in detection of alternating current and direct current stray currents of buried pipelines,
s1, selecting the position of the parallel buried pipeline to be detected;
s2, each pipeline corresponds to three magnetometer probes, and the three magnetometer probes are sequentially and horizontally arrayed at equal intervals on the ground surface where the corresponding buried pipeline is located;
two parallel pipelines, one pipeline corresponds to the first probe, the second probe and the third probe; the second pipeline corresponds to the fourth probe, the fifth probe and the sixth probe;
s3, when alternating current and direct current stray currents exist in the pipeline, the six probes respectively detect the magnetic fields at the respective positions;
s4, obtaining the vertical component of the external stable magnetic field interference according to the detection result of S3, and eliminating the vertical component influence of the external stable magnetic field interference;
s5, according to the results of S3 and S4, the buried depth of the pipeline is calculated;
s6, obtaining the current of the pipeline under the magnetometer probe array according to the buried depth of the pipeline obtained in the step S5;
and S7, the current obtained according to the S6 comprises both the direct current in the pipeline and the alternating current in the pipeline, and the direct current in the detected current is separated from the alternating current, so that the detection and the separation of the alternating current and direct current stray current in the buried pipeline can be realized.
Probes with frequencies greater than 1 kHz.
The selected magnetometer is a three-component magnetic saturation magnetometer.
Example 2
Referring to fig. 1, when the probe array is placed, the pipeline 1 is positioned right below the middle part of the horizontal connecting line of the probe 2 and the probe 3, and the projection of the horizontal connecting line between the probe 2 and the probe 3 on the horizontal plane is mutually vertical to the projection of the central axis of the pipeline 1 on the horizontal plane; the probe 1 is positioned on an extension line of a horizontal connecting line of the probe 2 and the probe 3, and the probe 1 is positioned on one side far away from the pipeline 2;
the pipeline 2 is positioned right below the middle part of the horizontal connecting line of the probe 4 and the probe 5, and the projection of the horizontal connecting line between the probe 4 and the probe 5 on the horizontal plane is vertical to the projection of the central axis of the pipeline 2 on the horizontal plane; the probe 6 is positioned on an extension of the horizontal connecting line of the probe 4 and the probe 5, and the probe 6 is positioned on one side far away from the pipeline 1.
The magnetometer probe is a high-frequency three-axis magnetic saturation magnetometer probe.
As shown in figure 1, there are parallel pipes 1 and 2, the buried depth d of the pipe 11In the tube, the current is I1The buried depth of the pipeline 2 is d2In the tube at a potential I2. Two sets of three-magnetic saturation magnetometer probe arrays are adopted to eliminate interference magnetic fields, and the number of the probes is respectively 1-6. The linear distances between the pipeline 1 and the 6 probes are r respectively11～r16The distances between the branch lines of the pipeline 2 and the 6 probes are r respectively21～r26. The central axes of the probe 2 and the probe 3 are positioned right above the pipeline 1, and the central axes of the probe 4 and the probe 5 are positioned right above the pipeline 2. The distances between the probes 1 and 2, between the probes 2 and 3, between the probes 4 and 5, and between the probes 5 and 6Are each l. The distance between the probe 3 and the probe 4 is s. The probe of the magnetic saturation magnetometer selects a three-axis type, and can measure the magnetic field of three components, namely, the parallel component, the vertical component and the axial component of the pipeline at each position. The magnetic field perpendicular to the ground detected by each probe mainly comprises the following parts: (1) the vertical component of an external steady magnetic field, e.g. H as shown by probe 6External droop. This component is the same size at each location, i.e. the magnetic field component is detected by probe 1 to probe 6. (2) The magnetic field generated by the current in the pipe 1 at the sensing location is related to the linear distance of the probe location from the pipe 1. E.g. H detected by the position of the probe 616 hang downThe magnitude of the magnetic field and r16And I1The size is relevant. (3) The magnetic field generated by the current in the pipe 2 at the sensing location is related to the linear distance of the probe location from the pipe 2. E.g. H detected by the position of the probe 626 hang downThe magnitude of the magnetic field and r26And I2The size is relevant. At this time, the stray currents in the parallel pipes interfere with each other, and affect the magnetic field detection of the pipes. In the detection process, the pipeline burial depth d, the pipeline current I and the magnetic field H of the external interference of the pipelineExternal droopAre all unknown quantities. The magnetic field components perpendicular to the ground at the positions detected by the probes 1 to 6 are respectively H1 hang downTo H6 hang down。
The method for testing the current in the lower pipe with the mutual interference of the stray currents of the parallel pipelines is explained by using the principle as follows.
The calculation formula of the relationship between the magnetic induction intensity and the current carrying size in the peripheral tangent direction of the long and straight current carrying conductor is as follows:
the calculation formula of the relationship between the magnetic field strength and the current carrying size in the peripheral tangent direction of the long straight current carrying conductor is as follows:
the relationship between the magnetic field detected by the position of each probe and each magnetic field is as follows, the magnetic field is positive with the vertical ground facing downwards:
H1 hang down＝-H11 droop-H21 hang down+HExternal droop；
H2 hang down＝-H12 droop-H22 droop+HExternal droop；
H3 hang down＝H13 hang down-H23 droop+HExternal droop； (2)
H4 hang down＝H14 droop-H24 droop+HExternal droop；
H5 hang down＝H15 hang down+H22 droop+HExternal droop；
H6 hang down＝H16 hang down+H26 hang down+HExternal droop；
The linear distance r between each probe and the pipeline can be determined by the buried depth d of the pipeline and the distance between the probe and the central axis of the pipeline. For example:
wherein d is1Is the burial depth of the first pipeline11、r12And r13The linear distances between the first probe, the second probe and the third probe and the axis of the first pipeline are respectively;
wherein d is2Is the burial depth of the first pipeline24、r25And r26Four probes,And the linear distance between the probe five and the probe six and the axis of the pipeline two.
H11 can be respectively hung from H to H by combining the calculation formula of the relationship between the electromagnetic field strength and the current carrying16 hang down、H21 hang down～H26 hang downIs denoted by d1、d2、I1、I2The relational expression (c) of (c). At this time, there is d in the equation set of the formula (2)1、d2、I1、I2H, 5 out-hanging unknowns, solving the equation set to obtain the buried depth d of the pipeline 1 under the interference of the parallel pipelines1Current I1Depth d of pipeline 22Current I2Therefore, alternating current and direct current stray currents in the pipeline under the condition of mutual interference of the currents of the parallel pipelines can be detected. The current obtained by the detection comprises direct current in the pipeline and alternating current in the pipeline, a high-frequency magnetic saturation magnetometer probe is selected, the direct current in the detected current is separated from the alternating current, and the detection and the separation of alternating current and direct current stray current in the buried pipeline can be realized.
Furthermore, the solution yields H11 droop～H16 hang down、H21 hang down～H26 hang downThe solution for stray currents in the pipeline can also be performed as follows.
Therefore, the parameters detected by the probe II satisfy the following conditions:
the parameters detected by the first probe satisfy the following conditions:
this gives:
the parameters detected by the probe five meet the following conditions:
the parameters detected by the probe six meet the following conditions:
this gives:
at this time, the horizontal component also includes external steady magnetic field interference, and in order to avoid the steady magnetic field horizontal component interference, the following calculation method is adopted:
wherein H11 flat、H12 pingThe horizontal components of the magnetic field intensity detected by the first probe and the second probe are respectively; h25 ping、H26 pingThe horizontal components of the magnetic field intensity detected by the probe five and the probe six are respectively;
at this time:
this gives:
finally, combining the formulas (7) and (10), obtaining the current of the pipeline under the three-magnetic saturation magnetometer probe array as follows:
the same can be obtained:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for eliminating the interference of parallel pipelines in the detection of the AC/DC stray current of buried pipelines is characterized in that,
s1, selecting the position of the parallel buried pipeline to be detected;
s2, each pipeline corresponds to three magnetometer probes, and the three magnetometer probes are sequentially and horizontally arrayed at equal intervals on the ground surface where the corresponding buried pipeline is located;
two parallel pipelines, one pipeline corresponds to the first probe, the second probe and the third probe; the second pipeline corresponds to the fourth probe, the fifth probe and the sixth probe;
s3, when alternating current and direct current stray currents exist in the pipeline, the six probes respectively detect magnetic fields at respective positions;
s4, obtaining the vertical component of the external stable magnetic field interference according to the detection result of S3, and eliminating the vertical component influence of the external stable magnetic field interference;
s5, according to the results of S3 and S4, the buried depth of the pipeline is calculated;
s6, obtaining the current of the pipeline under the magnetometer probe array according to the buried depth of the pipeline obtained in the step S5;
s7, according to the fact that the current obtained in the S6 contains direct current in the pipeline and alternating current in the pipeline, the direct current in the detected current is separated from the alternating current, and detection and separation of alternating current and direct current stray current in the buried pipeline can be achieved;
when the probe array is placed in the S2, the first pipeline is located right below the middle of a horizontal connecting line of the second probe and the third probe, and the projection of the horizontal connecting line between the second probe and the third probe on the horizontal plane is vertical to the projection of a central axis of the first pipeline on the horizontal plane; the first probe is positioned on an extension line of a horizontal connecting line of the second probe and the third probe, and the first probe is positioned on one side far away from the second pipeline; the second pipeline is positioned right below the middle part of the horizontal connecting line of the fourth probe and the fifth probe, and the projection of the horizontal connecting line between the fourth probe and the fifth probe on the horizontal plane is vertical to the projection of the central axis of the second pipeline on the horizontal plane; the probe six is positioned on an extension line of a horizontal connecting line of the probe four and the probe five, and the probe six is positioned on one side far away from the pipeline one;
step S4, the magnetic field strength of each probe is decomposed into a vertical component, a horizontal component and a pipeline axial component, the vertical component detected by the probe includes a vertical component of an external interference magnetic field, and the magnetic field is positive with the vertical ground facing downward:
H1 hang down＝-H11 droop-H21 hang down+HExternal droop；
H2 hang down＝-H12 droop-H22 droop+HExternal droop；
H3 hang down＝H13 hang down-H23 droop+HExternal droop；
H4 hang down＝H14 droop-H24 droop+HExternal droop；
H5 hang down＝H15 hang down+H22 droop+HExternal droop；
H6 hang down＝H16 hang down+H26 hang down+HExternal droop；
Wherein HExternal droopIs the vertical component of the external steady magnetic field; h1 hang down～H6 hang downThe magnetic field components of the positions, which are respectively obtained by detecting the first probe to the sixth probe, are vertical to the ground; h11 droop～H16 hang downThe magnetic field vertical ground components of the current in the first pipeline at the positions from the first probe to the sixth probe respectively correspond to the magnetic field vertical ground components; h21 hang down～H26 hang downThe magnetic field vertical ground components of the current in the second pipeline at the positions from the first probe to the sixth probe respectively;
thus, the vertical component of the external interference magnetic field and the vertical component of the pipeline to be tested after the external interference magnetic field is eliminated can be obtained;
assuming that the first pipeline is a pipeline to be detected, obtaining the current of the first pipeline under the magnetometer probe array as follows:
assuming that the second pipeline is a pipeline to be tested, obtaining the current of the second pipeline under the magnetometer probe array as follows:
2. the method of claim 1, wherein the magnetometer probe in S2 is a high frequency three axis magnetic saturation magnetometer probe.
3. The method of claim 2, wherein based on the electromagnetic field measurements of three of said probe arrays, according to the formula:
wherein d is1Is the burial depth of the first pipeline11、r12And r13The linear distances between the first probe, the second probe and the third probe and the axis of the first pipeline are respectively;
wherein d is2Is the burial depth of the first pipeline24、r25And r26Respectively a probe four, a probe five, a probe six and a pipelineLinear distance between two axes.
4. The method of claim 3,
the parameters detected by the probe II meet the following conditions:
the parameters detected by the first probe satisfy the following conditions:
this gives:
the parameters detected by the probe five meet the following conditions:
the parameters detected by the probe six meet the following conditions:
this gives:
5. the method of claim 4, wherein the horizontal component interference is excluded using the following calculation:
wherein H11 flat、H12 pingThe horizontal components of the magnetic field intensity detected by the first probe and the second probe are respectively; h25 ping、H26 pingThe horizontal components of the magnetic field intensity detected by the probe five and the probe six are respectively;
at this time:
this gives:
6. a method according to any one of claims 1 to 5, wherein the separation/' of each magnetometer probe is 0.4 m.
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| CN110687609A (en) | 2020-01-14 |
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