Arrayed magnetic sensor and ground conductor positioning method

Abstract

The application discloses an array type magnetic sensor and a grounding conductor positioning method, and the method comprises the following steps: (1) detecting the position of a grounding conductor according to an array type AMR sensor; and (2) calculating the depth of the measured grounding conductor according to the position of the grounding conductor determined in the step (1) and in combination with a magnetic resistance sensor. The application can detect the position of the grounding conductor and the depth information of the grounding net conductor, and can realize the rapid positioning of the grounding conductor, is accurate and reliable in positioning, and is convenient for corrosion state detection.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ground conductor positioning, and particularly relates to an array type magnetic sensor and a ground conductor positioning method. BACKGROUND

[0002] In the corrosion resistance degree evaluation process of the ground conductor of the current grounding net, positioning is needed before corrosion resistance degree testing, but the positioning of the ground conductor of the current grounding net is not accurate, the positioning efficiency is low, and the calculation accuracy and the testing efficiency of the corrosion resistance are greatly reduced. SUMMARY

[0003] The application aims to solve the technical problems in the prior art by providing an array type magnetic sensor and a ground conductor positioning method.

[0004] The technical scheme adopted by the application is as follows:

[0005] (1) judging the ground conductor orientation according to the magnetic induction intensity measured by two groups of horizontally arranged magnetic resistance sensors arranged opposite to each other of the array type AMR sensor;

[0006] (2) calculating the depth of the measured ground conductor according to the ground conductor orientation obtained in step (1) and a group of vertically arranged magnetic resistance sensors.

[0007] In step (1), when the array type AMR sensor judges the orientation of the ground conductor, a horizontal magnetic resistance sensor six is arranged at the center of the horizontal plane above the ground conductor, magnetic resistance sensor one, magnetic resistance sensor two, magnetic resistance sensor three and magnetic resistance sensor four are arranged around the center of the magnetic resistance sensor six, and the buried orientation of the ground conductor is judged according to the size of the magnetic induction intensity values measured by the two groups of magnetic resistance sensors arranged opposite to each other.

[0008] In step (2), when the depth of the measured ground conductor is calculated, the magnetic resistance sensor six is arranged directly above the midpoint of the measured ground conductor, the magnetic resistance sensor five is arranged at the center of the magnetic resistance sensor six in the vertical direction, and the magnetic resistance sensor seven is arranged above the magnetic resistance sensor five in the vertical direction, and the depth of the measured ground conductor is calculated according to the magnetic resistance sensor five and the magnetic resistance sensor seven.

[0009] The determination method of the buried orientation in step (1) is as follows: the magnetic induction intensity of the magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three, the magnetic resistance sensor four and the magnetic resistance sensor six is respectively B1, B2, B3, B4 and B6, the orientation of the grounding conductor is determined according to the direction indication method, that is, when B1=B3, B2=B4 and B6≈0, the direction of the grounding conductor is towards the front; when B1=B3 and B2>B4, the direction of the grounding conductor is towards the back; when B1=B3 and B2<B4, the direction of the grounding conductor is towards the front; when B1>B3 and B2=B4, the direction of the grounding conductor is towards the left; when B1>B3 and B2>B4, the direction of the grounding conductor is towards the left back; when B1>B3 and B2<B4, the direction of the grounding conductor is towards the left front; when B1<B3 and B2=B4, the direction of the grounding conductor is towards the right; when B1<B3 and B2>B4, the direction of the grounding conductor is towards the right back; when B1<B3 and B2<B4, the direction of the grounding conductor is towards the right front.

[0010] The depth calculation method of the measured grounding conductor is as follows: the magnetic induction intensity of the magnetic resistance sensor five and the magnetic resistance sensor seven along the x direction is respectively B5 and B7, the depth of the measured grounding conductor is calculated by using the numerical approximation method according to the ratio of B5 and B7.

[0011] An array type magnetic sensor structure for grounding conductor positioning, comprising a magnetic resistance sensor one, a magnetic resistance sensor two, a magnetic resistance sensor three, a magnetic resistance sensor four, a magnetic resistance sensor five, a magnetic resistance sensor six, a magnetic resistance sensor seven, a vertical beam and four horizontal beams, the four horizontal beams are fixedly connected in four mutually perpendicular directions in the middle and lower part of the vertical beam, the magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three and the magnetic resistance sensor four are fixedly connected vertically at the free end of the four horizontal beams, the magnetic resistance sensor six is fixedly connected horizontally at the bottom end of the vertical beam, the magnetic resistance sensor seven is fixedly connected vertically above the middle part of the vertical beam, the magnetic resistance sensor five is fixedly connected vertically in the middle and lower part of the vertical beam and below the four horizontal beams, and the top end of the vertical beam is connected through a suspension device.

[0012] The vertical beam and the four horizontal beams adopt TDT-2020 aluminum profiles.

[0013] The magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three, the magnetic resistance sensor four, the magnetic resistance sensor five, the magnetic resistance sensor six and the magnetic resistance sensor seven are connected on the adapter plate, and the adapter plate is connected on the vertical beam and the four horizontal beams through the breadboard.

[0014] The breadboard is connected on the T-shaped groove of the vertical beam and the four horizontal beams through a T-shaped screw.

[0015] The magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three, the magnetic resistance sensor four, the magnetic resistance sensor five, the magnetic resistance sensor six and the magnetic resistance sensor seven all adopt HMC1001 magnetic resistance sensors.

[0016] The magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three, the magnetic resistance sensor four and the magnetic resistance sensor six of the application can detect the position of the ground conductor in cooperation; the magnetic field measured by the magnetic resistance sensor five and the magnetic resistance sensor seven can be used to calculate the depth information of the ground conductor; the magnetic field information obtained by the magnetic resistance sensor five can be used to judge the corrosion state of the ground conductor, and the application can realize the rapid positioning of the ground conductor, and the positioning is accurate and reliable, and the corrosion state detection is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a flow chart of the grounding conductor positioning method based on the array type magnetic sensor;

[0018] Figure 2 It is a layout schematic diagram of the grounding net positioning and corrosion degree detection probe sensor;

[0019] Figure 3 It is a flow chart schematic diagram of the grounding conductor burying position determination method;

[0020] Figure 4 It is a schematic diagram of the grounding net positioning and corrosion degree detection probe installation structure;

[0021] Figure 5 It is a schematic diagram of the grounding net positioning and corrosion degree detection probe installation side view structure. DETAILED DESCRIPTION

[0022] The application will be further introduced below in combination with specific examples.

[0023] Example 1: as shown in the drawing, a grounding conductor positioning method based on an array type magnetic sensor, the method steps are as follows: Figures 1-5

[0024] (1) According to the array type AMR sensor arrangement, the position of the grounding conductor is detected: when the array type AMR sensor is used for position detection, a horizontal magnetic resistance sensor six is arranged at the center of the horizontal plane above the grounding conductor, the magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three and the magnetic resistance sensor four are arranged around the center of the magnetic resistance sensor six, and the burying position of the grounding conductor is judged according to the size of each sensor;

[0025] ​(2) After the ground conductor orientation is determined in step (1), the magnetic resistance sensor six is placed directly above the midpoint of the measured ground conductor, the magnetic resistance sensor five is arranged vertically at the center of the magnetic resistance sensor six, and the magnetic resistance sensor seven is arranged vertically above the magnetic resistance sensor five. The depth of the measured ground conductor is calculated according to the magnetic resistance sensor five and the magnetic resistance sensor seven.

[0026] In step (1), the determination method of the buried orientation is as follows: the magnetic induction intensity of the magnetic resistance sensor one, the magnetic resistance sensor two, the magnetic resistance sensor three, the magnetic resistance sensor four and the magnetic resistance sensor six is B1, B2, B3, B4 and B6 respectively. The orientation of the ground conductor is determined according to the direction indication method, that is, when B1=B3, B2=B4 and B6≈0, the ground conductor direction is towards the center; when B1=B3 and B2>B4, the ground conductor direction is towards the back; when B1=B3 and B2<B4, the ground conductor direction is towards the front; when B1>B3 and B2=B4, the ground conductor direction is towards the left; when B1>B3 and B2>B4, the ground conductor direction is towards the left back; when B1>B3 and B2<B4, the ground conductor direction is towards the left front; when B1<B3 and B2=B4, the ground conductor direction is towards the right; when B1<B3 and B2>B4, the ground conductor direction is towards the right back; when B1<B3 and B2<B4, the ground conductor direction is towards the right front.

[0027] The depth calculation method of the measured ground conductor is as follows: after the orientation information of the ground conductor is detected, the detection probe is placed directly above the midpoint of the measured ground conductor (that is, the difference ΔB 31 =0 between B1 and B3), at this time, the magnetic induction intensity generated by the measured ground conductor is much larger than the magnetic induction intensity of the adjacent ground conductor at this point, so only the magnetic induction intensity generated by the measured ground conductor can be considered. The depth value of the measured ground conductor can be obtained by jointly calculating the measured values of the magnetic resistance sensor five and the magnetic resistance sensor seven. At this time, the orientation coordinates (that is, x and y) of the magnetic resistance sensor five and the magnetic resistance sensor seven are determined. According to the single ground grid magnetic induction intensity theory, the magnetic induction intensity of the magnetic resistance sensor five and the magnetic resistance sensor seven along the x direction is B5 and B7 respectively, so

[0028]

[0029]

[0030] In order to eliminate the influence of the unstable external excitation current and the leakage current on the depth calculation, from formulas (1) and (2), we have:

[0031]

[0032] In equations (1)-(3), z is the vertical distance between the probe and the grounding conductor; a is the length of the grounding conductor being measured; Δh is the vertical distance between magnetoresistive sensor five and magnetoresistive sensor seven, and B5 and B7 can be measured by the sensors.

[0033] The value of z is solved using a numerical approximation method according to the following equation:

[0034]

[0035] In the formula, to obtain the most accurate depth calculation value possible, L is taken as... s ≤10 -6 That is, it is assumed that z at this time meets the detection requirements, where L is taken in the formula. s ≤10 -6 , z i L is the i-th value in the vertical distance sequence. s This is the approximation value.

[0036] Example 2: As Figures 4-5 As shown, an array-type magnetic sensor structure for locating a grounding conductor includes magnetoresistive sensor 1, magnetoresistive sensor 2, magnetoresistive sensor 3, magnetoresistive sensor 4, magnetoresistive sensor 5, magnetoresistive sensor 6, magnetoresistive sensor 7, a vertical beam 8, and four horizontal beams 9. The four horizontal beams 9 are fixedly connected to the lower part of the vertical beam 8 in four mutually perpendicular directions. Magnetoresistive sensors 1, 2, 3, and 4 are vertically fixedly connected to the free ends of the four horizontal beams 9. Magnetoresistive sensor 6 is horizontally fixedly connected to the bottom end of the vertical beam 8. Magnetoresistive sensor 7 is vertically fixedly connected above the middle of the vertical beam 8. Magnetoresistive sensor 5 is vertically fixedly connected to the lower part of the vertical beam 8 and located below the four horizontal beams 9. The top of the vertical beam 8 is connected by a suspension device. The vertical beam 8 is 300mm long, and the horizontal beams 9 are all 200mm long. The vertical beam 8 and the four horizontal beams 9 are made of TDT-2020 aluminum profiles.

[0037] Magnetoresistive sensor 1, magnetoresistive sensor 2, magnetoresistive sensor 3, magnetoresistive sensor 4, magnetoresistive sensor 5, magnetoresistive sensor 6, and magnetoresistive sensor 7 are all connected to an adapter plate. The adapter plate is connected to the vertical beam 8 and four horizontal beams 9 via a breadboard. The breadboard is made of 3D printed parts and is attached to the aluminum profile. It can slide on the breadboard to adjust the distance between the sensors. The power supply is provided to the HMC1001 sensors via a 5V voltage regulator module.

[0038] The breadboard is connected to the T-slots on the vertical beam 8 and the four horizontal beams 9 by T-bolts.

[0039] The magnetic resistance sensor one 1, the magnetic resistance sensor two 2, the magnetic resistance sensor three 3, the magnetic resistance sensor four 4, the magnetic resistance sensor five 5, the magnetic resistance sensor six 6 and the magnetic resistance sensor seven 7 all adopt HMC1001 magnetic resistance sensors.

[0040] The ground net detection probe sensor layout is shown as Figure 2 The cooperation between the No.1, No.2, No.3, No.4 and No.6 sensors can detect the orientation of the ground conductor; the magnetic field measured by the No.5 and No.7 sensors can be used to calculate the depth information of the ground net conductor; the magnetic field information obtained by the No.5 sensor can be used to judge the corrosion state of the ground net conductor. The arrangement position of the sensor directly affects the accuracy of the detection depth, so it is crucial to determine the distance between the No.1 sensor and the No.3 sensor (the distance between the No.2 sensor and the No.4 sensor) and the distance between the No.5 sensor and the No.7 sensor through numerical calculation. According to the prior art, the magnetic induction intensity of a point in space is directly related to the three-dimensional coordinate of the point, and when detecting the buried depth of the ground net, it is not only related to the three-dimensional coordinate of the space, but also related to the height difference Δh between the No.5 sensor and the No.7 sensor, so the calculation process is more complex. Therefore, it is necessary to determine the distance between the No.1 sensor and the No.3 sensor (the distance between the No.2 sensor and the No.4 sensor), and through the method of controlling variables, the variables in the subsequent detection of the ground net depth are reduced, so that effective and accurate calculation can be achieved.

[0041] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for locating a grounding conductor based on an array of magnetic sensors, characterized in that: The steps of this method are as follows: (1) Determine the orientation of the grounding conductor based on the magnetic induction intensity measured by two sets of horizontal magnetoresistive sensors arranged opposite each other in the array-type AMR sensor. (2) Calculate the depth of the grounding conductor to be measured based on the orientation of the grounding conductor obtained in step (1) and the arrangement of a set of vertical magnetoresistive sensors; In step (1), when the array-type AMR sensor determines the orientation of the grounding conductor, a horizontal magnetoresistive sensor six is ​​arranged at the center of the horizontal plane above the grounding conductor. Magnetoresistive sensor one, magnetoresistive sensor two, magnetoresistive sensor three and magnetoresistive sensor four are arranged around the magnetoresistive sensor six. The orientation of the grounding conductor is determined based on the magnitude of the magnetic induction intensity value measured by the two sets of magnetoresistive sensors arranged in pairs. In step (2), when calculating the depth of the grounding conductor being measured, magnetoresistive sensor six is ​​placed directly above the midpoint of the grounding conductor being measured. A vertical magnetoresistive sensor five is arranged in the center of magnetoresistive sensor six, and a vertical magnetoresistive sensor seven is arranged above it. The depth of the grounding conductor being measured is calculated based on magnetoresistive sensor five and magnetoresistive sensor seven. The method for determining the burial orientation in step (1) is as follows: Let the magnetic induction intensities of magnetoresistive sensor 1, magnetoresistive sensor 2, magnetoresistive sensor 3, magnetoresistive sensor 4, and magnetoresistive sensor 6 be B1, B2, B3, B4, and B6, respectively. The orientation of the grounding conductor is determined according to the direction indication method, that is, when , and When, the grounding conductor is oriented towards the center; when and When, the grounding conductor points directly backward; when and When, the grounding conductor points directly forward; when and When, the direction of the grounding conductor points to the left; when and The grounding conductor points to the left rear; when and At that time, the grounding conductor points to the left front; and When, the grounding conductor points to the right; when and When, the direction of the grounding conductor points to the right rear; when and At that time, the direction of the grounding conductor points to the right front; The method for calculating the depth of the grounding conductor being measured is as follows: Assume that magnetoresistive sensor five and magnetoresistive sensor seven are along... The magnetic induction intensities in the directions are respectively and ,according to and The ratio is obtained by using a numerical approximation method to determine the depth of the grounded conductor under test.

2. An array-type magnetic sensor structure for locating grounding conductors, used in a grounding conductor location method based on an array-type magnetic sensor, characterized in that: It includes magnetoresistive sensor 1 (1), magnetoresistive sensor 2 (2), magnetoresistive sensor 3 (3), magnetoresistive sensor 4 (4), magnetoresistive sensor 5 (5), magnetoresistive sensor 6 (6), magnetoresistive sensor 7 (7), a vertical beam (8), and four horizontal beams (9). The four horizontal beams (9) are fixedly connected to the lower part of the vertical beam (8) in four mutually perpendicular directions. Magnetoresistive sensor 1 (1), magnetoresistive sensor 2 (2), magnetoresistive sensor 3 (3), and magnetoresistive sensor 4 (4) are vertically fixedly connected to the free ends of the four horizontal beams (9). Magnetoresistive sensor 6 (6) is horizontally fixedly connected to the bottom end of the vertical beam (8). Magnetoresistive sensor 7 (7) is vertically fixedly connected to the upper part of the middle of the vertical beam (8). Magnetoresistive sensor 5 (5) is vertically fixedly connected to the lower part of the vertical beam (8) and located below the four horizontal beams (9). The top of the vertical beam (8) is connected by a suspension device.

3. The array-type magnetic sensor structure for locating a grounding conductor according to claim 2, characterized in that: The vertical beam (8) and the four horizontal beams (9) are made of TDT-2020 aluminum profiles.

4. The array-type magnetic sensor structure for locating a grounding conductor according to claim 3, characterized in that: Magnetoresistive sensor 1 (1), magnetoresistive sensor 2 (2), magnetoresistive sensor 3 (3), magnetoresistive sensor 4 (4), magnetoresistive sensor 5 (5), magnetoresistive sensor 6 (6), and magnetoresistive sensor 7 (7) are all connected to the adapter plate, which is connected to the vertical beam (8) and four horizontal beams (9) via a breadboard.

5. An array-type magnetic sensor structure for locating a grounding conductor according to claim 3, characterized in that: The breadboard is connected to the T-slots on the vertical beam (8) and the four horizontal beams (9) by T-bolts.

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