CN113155004A - Device and method for calibrating magnetic parameters of reinforcement cage length magnetic detector - Google Patents

Device and method for calibrating magnetic parameters of reinforcement cage length magnetic detector Download PDF

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CN113155004A
CN113155004A CN202110249766.3A CN202110249766A CN113155004A CN 113155004 A CN113155004 A CN 113155004A CN 202110249766 A CN202110249766 A CN 202110249766A CN 113155004 A CN113155004 A CN 113155004A
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CN113155004B (en
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周振杰
李绍辉
曹玉芬
韩鸿胜
李妍
赵禹晴
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Tianjin Research Institute for Water Transport Engineering MOT
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
    • G01R33/0035—Calibration of single magnetic sensors, e.g. integrated calibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/04—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle

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Abstract

一种钢筋笼长度磁法检测仪磁参量校准装置及方法。装置包括笔记本电脑、高精度磁通门计主机、直流恒流源组、机柜、圆柱形五层磁屏蔽筒、支撑平台、三维亥姆霍兹线圈、旋转角度盘和高精度磁通门计探头；本发明提供的钢筋笼长度磁法检测仪磁参量校准装置及方法具有如下有益效果：本发明解决了钢筋笼长度磁法检测仪磁参量溯源难题。校准装置集成度高，实现了钢筋笼长度磁法检测仪磁参量测量范围、分辨力、示值误差和转向差的校准功能，试验过程中无须重复拆卸、连接测试设备，易于实现，具有良好的应用效果和推广价值。

Figure 202110249766

A magnetic parameter calibration device and method for a magnetic method detector for the length of a steel cage. The device includes a laptop computer, a high-precision fluxgate host, a DC constant current source group, a cabinet, a cylindrical five-layer magnetic shielding cylinder, a support platform, a three-dimensional Helmholtz coil, a rotating angle disk and a high-precision fluxgate probe The magnetic parameter calibration device and method of the magnetic method detector for the length of the steel cage provided by the present invention has the following beneficial effects: the invention solves the problem of tracing the magnetic parameters of the magnetic method detector for the length of the steel cage. The calibration device is highly integrated, and realizes the calibration function of the magnetic parameter measurement range, resolution, indication error and steering difference of the steel cage length magnetic method detector. During the test process, there is no need to repeatedly disassemble and connect the test equipment. It is easy to implement and has good performance. Application effect and promotion value.

Figure 202110249766

Description

Device and method for calibrating magnetic parameters of reinforcement cage length magnetic detector
Technical Field
The invention belongs to the technical field of traffic and water transport engineering measurement calibration, and particularly relates to a device and a method for calibrating magnetic parameters of a reinforcement cage length magnetic method detector in the field of traffic engineering.
Background
The cast-in-place pile has the advantages of mechanical drilling, high bearing capacity, strong adaptability and the like, is widely applied to projects such as bridges, viaducts, ports and wharfs and the like, and becomes the most important basic form in the engineering construction of China. The length of the reinforcement cage of the foundation pile is determined according to relevant specifications and calculated according to load, bending moment, soil conditions around the pile, seismic fortification strength, whether the foundation pile belongs to the uplift pile and the end-supported pile and the like. Because the cast-in-place pile is usually underwater, the reinforcement cage in the pile becomes a main object for illegal constructors to steal labor and reduce materials. If the reinforcing bars are insufficient or the length of the reinforcement cage does not meet the design requirements, the stability and the seismic performance of the cast-in-place pile foundation can be seriously influenced, and potential safety hazards are caused to buildings. The reinforcement cage length can not meet the requirement and is regarded as the integrity defect of the pile body, so the detection of the reinforcement cage length is extremely important. The most direct detection method for the length of the reinforcement cage is excavation verification, but for a concrete cast-in-place pile with the pile length of tens of meters and the pile diameter exceeding 0.8m, the excavation verification difficulty is very high. With the development of science and technology, the detection technology of pile foundation engineering is continuously improved, new theories and new methods are continuously proposed, and people seek various technologies which can accurately detect and do not damage the pile foundation to detect. The magnetic detection instrument for the length of the reinforcement cage based on the magnetic detection method is applied by vast detection units due to the advantages of portability, high working efficiency, low price and the like of the detection instrument. However, the change of the working environment for a long time will cause the change of the performance of the instrument itself, resulting in a large deviation of the measurement result of the instrument. Therefore, it is important to regularly calibrate the metering performance of the reinforcement cage length magnetic detector.
At present, China does not find a special calibration device for a reinforcement cage length magnetic method detector, and if the reinforcement cage length magnetic method detector which is not accurately measured is applied to pile body reinforcement cage length detection, great potential safety hazards are certainly caused to engineering.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a device and a method for calibrating magnetic parameters of a reinforcement cage length magnetic detector.
In order to achieve the purpose, the magnetic parameter calibration device of the reinforcement cage length magnetic method detector comprises a notebook computer, a high-precision fluxgate meter host, a direct current constant current source group, a cabinet, a cylindrical five-layer magnetic shielding cylinder, a supporting platform, a three-dimensional Helmholtz coil, a rotation angle disc and a high-precision fluxgate meter probe; the direct current constant current source group and the high-precision fluxgate meter host are arranged in the cabinet and are electrically connected with the notebook computer; the cylindrical five-layer magnetic shielding cylinder is arranged on the supporting platform; the three-dimensional Helmholtz coil is arranged in the cylindrical five-layer magnetic shielding cylinder and is electrically connected with the direct current constant current source group; the rotation angle scale is fixed in the middle of the three-dimensional Helmholtz coil; the high-precision fluxgate meter probe is fixed in the three-dimensional Helmholtz coil and is electrically connected with the high-precision fluxgate host; and a probe of the magnetic detector for the length of the steel reinforcement cage to be detected, which is connected with the host of the magnetic detector for the length of the steel reinforcement cage to be detected, is fixed in the rotating angle scale.
The cylindrical five-layer shielding cylinder consists of a first layer shielding body, a second layer shielding body, a third layer shielding body, a fourth layer shielding body and a fifth layer shielding body from outside to inside; the first layer of shielding body and the fifth layer of shielding body are made of aluminum materials, the second layer of shielding body, the third layer of shielding body and the fourth layer of shielding body are made of permalloy with high magnetic permeability, and the diameter of an inner cavity uniform area is larger than or equal to 350 mm.
The three-dimensional Helmholtz coil comprises a three-dimensional coil winding and a support; the three-dimensional coil winding is composed of annular X-direction coils, Y-direction coils and Z-direction coils, the maximum diameter is 430mm, and the magnetic field uniform area is larger than 100mm multiplied by 100 mm; the support is made of an industrial grade acrylic material and is fixed in a magnetic field uniform area of the three-dimensional Helmholtz coil; the angle turntable is fixed on the support; a probe of the magnetic length detector of the steel reinforcement cage to be detected is fixed in the rotation angle scale, and the measuring point of the probe is positioned in a magnetic field uniform area of the three-dimensional Helmholtz coil; the high-precision fluxgate meter probe is installed in an open slot in the support.
The magnetic field intensity measuring range of the detected reinforcement cage length magnetic method detector probe is +/-200000 nT, the diameter range is 10mm-50mm, the resolution is better than 10nT, the steering difference is better than 300nT, and the maximum allowable error is +/-150 nT.
The method for calibrating the magnetic parameters of the reinforcement cage length magnetic method detector by using the reinforcement cage length magnetic method detector magnetic parameter calibration device provided by the invention comprises the following steps in sequence:
step 1: sequentially connecting all parts on a magnetic parameter calibration device of a reinforcement cage length magnetic method detector, adjusting and fixing a high-precision fluxgate meter probe and a detected reinforcement cage length magnetic method detector probe to enable measuring points of the high-precision fluxgate meter probe and the detected reinforcement cage length magnetic method detector probe to be positioned in a magnetic field uniform region of a three-dimensional Helmholtz coil, wherein XYZ measuring axes of the high-precision fluxgate meter probe respectively correspond to the XYZ directions of three-dimensional coil windings one by one, and the detected reinforcement cage length magnetic method detector probe is parallel to a coil in the X direction;
step 2: electrifying and preheating a magnetic parameter calibration device of a reinforcement cage length magnetic method detector, initializing a serial port, collecting the magnetic field intensity of a three-dimensional coil winding in the cylindrical five-layer magnetic shielding cylinder in the x direction by a notebook computer, and recording the background magnetic field intensity in the cylindrical five-layer magnetic shielding cylinder;
and step 3: adjusting the magnetic field intensity in the x direction to 0nT by using a notebook computer, and applying a reverse magnetic field to the magnetic field intensity in the x direction by adjusting the current of the direct current constant current source set to enable a probe of the magnetic detector for the length of the steel reinforcement cage to be detected to be in a zero magnetic field intensity state;
step 4, adjusting the current of the direct current constant current source set through a notebook computer to enable the magnetic field intensity in the x direction of the three-dimensional coil winding to be displayed as-100000 nT, recording the magnetic field intensity indication value displayed by a host of the detected reinforcement cage magnetic method length detector, then changing the current direction to enable the magnetic field intensity in the x direction to be displayed as +100000nT, recording the magnetic field intensity indication value displayed by the host of the detected reinforcement cage magnetic method length detector again, wherein the two-time indication interval of the host of the detected reinforcement cage magnetic method length detector is the magnetic field intensity measurement range of the probe of the detected reinforcement cage magnetic method length detector;
step 5, regulating the current of the direct current constant current source group through a notebook computer to ensure that the magnetic field intensity of the three-dimensional coil winding in the x direction changes in a gradient stepping manner of 5nT, wherein when the magnetic field intensity indication value displayed by the host machine of the detected reinforcement cage magnetic length detector changes, the total variable quantity of the magnetic field intensity of the three-dimensional coil winding in the x direction is the magnetic field intensity resolution of the host machine of the detected reinforcement cage magnetic length detector;
step 6, uniformly selecting not less than 7 calibration points including a zero point and a full-scale point in the measurement range according to the magnetic field intensity measurement range of the probe of the reinforcement cage to be detected by the magnetic length detector; adjusting the current of the direct current constant current source set through a notebook computer to enable the x direction of the three-dimensional coil winding to generate the magnetic field strength corresponding to each calibration point, wherein the magnetic field strength is acquired by a high-precision fluxgate meter probe and displayed by a high-precision fluxgate meter host, and the indication value of the magnetic field strength measured by the host of the reinforcement cage magnetic method length detector to be detected is recorded;
and 7: calculating the indication error of the magnetic field intensity of the probe of the magnetic length detector of the steel reinforcement cage to be detected according to the formula (1), and taking the maximum absolute value of the indication error of the magnetic field intensity of each calibration point as the calibration result of the indication error of the magnetic field intensity of the probe of the magnetic length detector of the steel reinforcement cage to be detected;
Figure RE-GDA0003073764470000041
in the formula:
eta is the indicating value error of the magnetic field intensity measured by the probe of the magnetic length detector of the steel reinforcement cage to be detected at each calibration point;
Bithe magnetic field intensity indication value nT measured by the host machine of the magnetic length detector of the steel reinforcement cage at each calibration point;
Bi0-the respective magnetic field strength, nT, generated in the X direction of the three-dimensional coil winding at each calibration point;
BFS-the magnetic field strength measuring range, nT, of the magnetic length detector of the steel reinforcement cage to be tested;
and 8, selecting a certain calibration point, rotating the rotation angle disc for a circle, respectively recording the magnetic field intensity indication values of the host 110 of the detected reinforcement cage magnetic length detector at 90 degrees, 180 degrees, 270 degrees and 360 degrees, and taking the difference of the maximum value minus the minimum value as the calibration result of the magnetic field intensity steering difference.
The device and the method for calibrating the magnetic parameters of the reinforcement cage length magnetic detector have the following beneficial effects: the invention solves the problem of tracing the magnetic parameters of the reinforcement cage length magnetic detector. The calibration device is high in integration level, realizes the calibration functions of the measurement range, resolution, indication error and steering error of the magnetic parameters of the steel reinforcement cage length magnetic detector, does not need to be repeatedly disassembled and connected with test equipment in the test process, is easy to realize, and has good application effect and popularization value.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic parameter calibration device of a magnetic detector for the length of a reinforcement cage according to the present invention;
FIG. 2 is a schematic structural diagram of a support platform and components thereon in the calibration device for magnetic parameters of the reinforcement cage length magnetic detector provided by the invention;
FIG. 3 is a cross-sectional view of the interior of a cylindrical five-layer magnetic shielding cylinder in the magnetic parameter calibration device of the reinforcement cage length magnetic detector provided by the invention;
FIG. 4 is a three-dimensional Helmholtz coil structure diagram in the calibration device for the magnetic parameters of the reinforcement cage length magnetic detector provided by the invention;
FIG. 5 is a structural diagram of a support and a rotation angle scale in the calibration device for the magnetic parameters of the reinforcement cage length magnetic detector provided by the invention;
fig. 6 is an electrical connection schematic diagram of the magnetic parameter calibration device of the reinforcement cage length magnetic detector provided by the invention.
Detailed Description
The device and the method for calibrating the magnetic parameters of the reinforcement cage length magnetic detector provided by the invention are described in detail below with reference to the accompanying drawings and specific embodiments.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 to 6, the magnetic parameter calibration device for a reinforcement cage length magnetic method detector provided by the invention comprises a notebook computer 10, a high-precision fluxgate meter host 20, a direct current constant current source set 30, a cabinet 40, a cylindrical five-layer magnetic shielding cylinder 50, a support platform 60, a three-dimensional helmholtz coil 70, a rotation angle scale 80 and a high-precision fluxgate meter probe 90; the direct current constant current source group 30 and the high-precision fluxgate meter host 20 are arranged in the cabinet 40 and are electrically connected with the notebook computer 10; the cylindrical five-layer magnetic shielding cylinder 50 is arranged on the supporting platform 60; the three-dimensional Helmholtz coil 70 is arranged in the cylindrical five-layer magnetic shielding cylinder 50 and is electrically connected with the direct current constant current source group 30; the rotation angle scale 80 is fixed in the middle of the three-dimensional Helmholtz coil 70; the high-precision fluxgate meter probe 90 is fixed in the three-dimensional helmholtz coil 70 and electrically connected with the high-precision fluxgate host 20; the detected reinforcement cage length magnetic method detector probe 100 connected with the detected reinforcement cage length magnetic method detector host 110 is fixed in the rotation angle scale 80.
The cylindrical five-layer shielding cylinder 50 is composed of a first layer shielding body 501, a second layer shielding body 502, a third layer shielding body 503, a fourth layer shielding body 504 and a fifth layer shielding body 505 from outside to inside; the first layer of shielding body 501 and the fifth layer of shielding body 505 are made of aluminum materials, the second layer of shielding body 502, the third layer of shielding body 503 and the fourth layer of shielding body 504 are made of permalloy with high permeability, the diameter of an inner cavity uniform area is larger than or equal to 350mm, and geomagnetism can be shielded to be less than 10 nT.
The three-dimensional Helmholtz coil 70 comprises a three-dimensional coil winding 701 and a support 702; the three-dimensional coil winding 701 is composed of an annular X-direction coil 7011, an annular Y-direction coil 7012 and an annular Z-direction coil 7013, the maximum diameter is 430mm, and a magnetic field uniform area is larger than 100mm multiplied by 100 mm; the support 702 is made of an industrial grade acrylic material and is fixed in a magnetic field uniform area of the three-dimensional Helmholtz coil 70; the angle dial 80 is fixed on the support 702; the probe 100 of the magnetic length detector for the steel reinforcement cage to be detected is fixed in the rotation angle scale 80, can realize rotation of 0 degree, 90 degrees, 180 degrees and 270 degrees, and the measurement point is positioned in the magnetic field uniform area of the three-dimensional Helmholtz coil 70; the high precision fluxgate meter probe 90 is mounted in an open slot in the pedestal 702.
The magnetic field intensity measuring range of the detected reinforcement cage length magnetic method detector probe 100 is +/-200000 nT, the diameter range is 10mm-50mm, the resolution is better than 10nT, the steering difference is better than 300nT, and the maximum allowable error is +/-150 nT.
The magnetic field intensity measuring range of the magnetic parameter calibration device of the reinforcement cage length magnetic method detector provided by the invention is-500000- +500000nT, and the resolution is as follows: 0.1nT, maximum allowable error: +/-50 nT, and the uniformity of magnetic field strength is better than 1%.
When the magnetic detector works, the direct current constant current source group 30 is connected with the three-dimensional coil winding 701 through a cable, the high-precision fluxgate meter host 20 and the direct current constant current source group 30 are connected with the notebook computer 10 through USB data lines, the high-precision fluxgate meter host 20 is connected with the high-precision fluxgate meter probe 90, and the detected reinforcement cage length magnetic detector host 110 is connected with the detected reinforcement cage length magnetic detector probe 100. Opening the cylindrical five-layer magnetic shielding cylinder 50, inserting the high-precision fluxgate meter probe 90 into an open slot on the support 702, installing the detected reinforcement cage length magnetic method detector probe 100 on the rotating angle scale 80, and closing the cylindrical five-layer magnetic shielding cylinder 50 to shield external magnetic field interference; and (3) electrifying the direct current constant current source group 30 and the high-precision fluxgate meter host 20, opening the notebook computer 10, and preheating the system by 5 min. The magnetic field intensity measuring range is obtained by measuring the indication value of the host 110 of the magnetic length detector of the steel reinforcement cage to be detected when the indication value is +/-200000 nT. When the indication value of the magnetic field strength of the host 110 of the magnetic length detector for the steel reinforcement cage to be detected is changed, the resolution of the magnetic field strength is obtained by measuring the total variation of the magnetic field strength of the three-dimensional coil winding 701 in the x direction. And calculating the magnetic field intensity indicating value error by using a formula according to the measurement data results of the plurality of calibration points. The magnetic field steering difference is obtained by measuring the magnetic field intensity indication values of the host 110 of the magnetic length detector of the steel reinforcement cage to be detected at 90 degrees, 180 degrees, 270 degrees and 360 degrees.
The method for calibrating the magnetic parameters of the reinforcement cage length magnetic method detector by using the reinforcement cage length magnetic method detector magnetic parameter calibration device comprises the following steps in sequence:
step 1: sequentially connecting all parts on the magnetic parameter calibration device of the reinforcement cage length magnetic method detector, adjusting and fixing the high-precision fluxgate meter probe 90 and the detected reinforcement cage length magnetic method detector probe 100 to enable the measuring point to be in the magnetic field uniform region of the three-dimensional Helmholtz coil 70, wherein XYZ measuring axes of the high-precision fluxgate meter probe 90 are respectively in one-to-one correspondence with the XYZ direction of the three-dimensional coil winding 701, and the detected reinforcement cage length magnetic method detector probe 100 is parallel to the X-direction coil 7011;
step 2: electrifying and preheating a magnetic parameter calibration device of a reinforcement cage length magnetic method detector, initializing a serial port, collecting the magnetic field intensity of the three-dimensional coil winding 701 in the cylindrical five-layer magnetic shielding cylinder 50 in the x direction by a notebook computer 10, and recording the background magnetic field intensity in the cylindrical five-layer magnetic shielding cylinder 50;
and step 3: the magnetic field intensity in the x direction is adjusted to be 0nT by using the notebook computer 10, and a reverse magnetic field is applied to the magnetic field intensity in the x direction by adjusting the current of the direct current constant current source group 30, so that the probe 100 of the magnetic detector for the length of the steel reinforcement cage to be detected is in a zero magnetic field intensity state;
step 4, adjusting the current of the direct current constant current source group 30 through the notebook computer 10 to enable the magnetic field intensity in the x direction of the three-dimensional coil winding 701 to be displayed as-100000 nT, recording the magnetic field intensity indication value displayed by the host 110 of the magnetic method length detector of the steel reinforcement cage to be detected, then changing the current direction to enable the magnetic field intensity in the x direction to be displayed as +100000nT, recording the magnetic field intensity indication value displayed by the host 110 of the magnetic method length detector of the steel reinforcement cage to be detected again, wherein the interval of two indication values of the host 110 of the magnetic method length detector of the steel reinforcement cage to be detected is the magnetic field intensity measurement range of the probe 100 of the magnetic method length detector of the steel reinforcement cage to be detected;
step 5, adjusting the current of the direct current constant current source group 30 through the notebook computer 10 to enable the magnetic field strength of the three-dimensional coil winding 701 in the x direction to change in a gradient stepping manner of 5nT, wherein when the magnetic field strength indication value displayed by the main machine 110 of the detected reinforcement cage magnetic length detector changes, the total variation of the magnetic field strength of the three-dimensional coil winding 701 in the x direction is the magnetic field strength resolution of the main machine 110 of the detected reinforcement cage magnetic length detector;
step 6, uniformly selecting not less than 7 calibration points including a zero point and a full-scale point in the measurement range according to the magnetic field intensity measurement range of the probe 100 of the reinforcement cage to be detected by the magnetic length detector; the current of the direct current constant current source group 30 is adjusted through the notebook computer 10, so that the magnetic field strength corresponding to each calibration point is generated in the x direction of the three-dimensional coil winding 701, the magnetic field strength is collected by the high-precision fluxgate meter probe 90 and displayed by the high-precision fluxgate meter host 20, and the magnetic field strength indication value measured by the reinforcement cage magnetic method length detector host 110 is recorded;
and 7: calculating the indicating error of the magnetic field intensity of the probe 100 of the magnetic length detector of the steel reinforcement cage to be detected according to the formula (1), and taking the maximum absolute value of the indicating error of the magnetic field intensity of each calibration point as the calibration result of the indicating error of the magnetic field intensity of the probe 100 of the magnetic length detector of the steel reinforcement cage to be detected;
Figure RE-GDA0003073764470000091
in the formula:
eta is the indicating value error of the magnetic field intensity measured by the probe 100 of the length detector for the steel reinforcement cage to be detected at each calibration point by a magnetic method;
Bithe indication value of the magnetic field intensity nT measured by the host 110 of the magnetic length detector for the steel reinforcement cage to be detected at each calibration point;
Bi0the corresponding magnetic field strength, nT, generated in the X direction of the three-dimensional coil winding 701 at each calibration point;
BFSthe magnetic field intensity measuring range nT of the magnetic length detector of the steel reinforcement cage to be detected.
And 8, selecting a certain calibration point, rotating the rotation angle disc for 80 circles, respectively recording the magnetic field intensity indication values of the host 110 of the detected reinforcement cage magnetic length detector at 90 degrees, 180 degrees, 270 degrees and 360 degrees, and taking the difference of the maximum value minus the minimum value as the calibration result of the magnetic field intensity steering difference.

Claims (5)

1.一种钢筋笼长度磁法检测仪磁参量校准装置，其特征在于：所述的钢筋笼长度磁法检测仪磁参量校准装置包括笔记本电脑(10)、高精度磁通门计主机(20)、直流恒流源组(30)、机柜(40)、圆柱形五层磁屏蔽筒(50)、支撑平台(60)、三维亥姆霍兹线圈(70)、旋转角度盘(80)和高精度磁通门计探头(90)；其中，直流恒流源组(30)与高精度磁通门计主机(20)置于机柜(40)内，并且均与笔记本电脑(10)电连接；圆柱形五层磁屏蔽筒(50)置于支撑平台(60)之上；三维亥姆霍兹线圈(70)置于圆柱形五层磁屏蔽筒(50)内且与直流恒流源组(30)电连接；旋转角度盘(80)固定在三维亥姆霍兹线圈(70)中间；高精度磁通门计探头(90)固定在三维亥姆霍兹线圈(70)中且与高精度磁通门主机(20)电连接；与被检钢筋笼长度磁法检测仪主机(110)连接的被检钢筋笼长度磁法检测仪探头(100)固定在旋转角度盘(80)中。1. a magnetic parameter calibration device of a magnetic method detector for the length of a steel bar cage, is characterized in that: the magnetic parameter calibration device of the magnetic method detector for the length of a steel bar cage comprises a notebook computer (10), a high-precision fluxgate meter host (20 ), a DC constant current source group (30), a cabinet (40), a cylindrical five-layer magnetic shielding cylinder (50), a supporting platform (60), a three-dimensional Helmholtz coil (70), a rotating angle disc (80) and A high-precision fluxgate meter probe (90); wherein the DC constant current source group (30) and the high-precision fluxgate meter host (20) are placed in the cabinet (40), and both are electrically connected to the notebook computer (10) The cylindrical five-layer magnetic shielding cylinder (50) is placed on the support platform (60); the three-dimensional Helmholtz coil (70) is placed in the cylindrical five-layer magnetic shielding cylinder (50) and is combined with the DC constant current source group (30) Electrical connection; the rotating angle disc (80) is fixed in the middle of the three-dimensional Helmholtz coil (70); the high-precision fluxgate probe (90) is fixed in the three-dimensional Helmholtz coil (70) and is connected to the high-precision Helmholtz coil (70). The precision magnetic fluxgate host (20) is electrically connected; the probe (100) of the magnetic method detector for the length of the steel cage under inspection, which is connected with the main engine (110) of the magnetic method detector for the length of the steel bar cage under inspection, is fixed in the rotation angle plate (80). 2.根据权利要求1所述的钢筋笼长度磁法检测仪磁参量校准装置，其特征在于：所述的圆柱形五层屏蔽筒(50)由从外至内的第一层屏蔽体(501)、第二层屏蔽体(502)、第三层屏蔽体(503)、第四层屏蔽体(504)和第五层屏蔽体(505)构成；其中第一层屏蔽体(501)和第五层屏蔽体(505)采用铝材制成，第二层屏蔽体(502)、第三层屏蔽体(503)和第四层屏蔽体(504)采用高导磁坡莫合金制成，内腔均匀区直径≥350mm。2. The magnetic parameter calibration device of a magnetic method detector for the length of a steel cage according to claim 1, wherein the cylindrical five-layer shielding cylinder (50) is composed of a first-layer shielding body (501) from the outside to the inside. ), a second layer of shielding body (502), a third layer of shielding body (503), a fourth layer of shielding body (504) and a fifth layer of shielding body (505); The five-layer shielding body (505) is made of aluminum, the second-layer shielding body (502), the third-layer shielding body (503) and the fourth-layer shielding body (504) are made of high magnetic permeability permalloy. The diameter of the uniform area of the cavity is ≥350mm. 3.根据权利要求1所述的钢筋笼长度磁法检测仪磁参量校准装置，其特征在于：所述的三维亥姆霍兹线圈(70)包括三维线圈绕组(701)和支座(702)；三维线圈绕组(701)由环形的X方向线圈(7011)、Y方向线圈(7012)和Z方向线圈(7013)构成，最大直径430mm，磁场均匀区大于100mm×100mm×100mm；支座(702)采用工业级亚克力材料制成，固定在三维亥姆霍兹线圈(70)的磁场均匀区内；角度转盘(80)固定在支座(702)上；被检钢筋笼长度磁法检测仪探头(100)固定在旋转角度盘(80)中，并且其测量点处于三维亥姆霍兹线圈(70)的磁场均匀区内；高精度磁通门计探头(90)安装在支座(702)内的开口槽中。3. The magnetic parameter calibration device of a magnetic method detector for the length of a steel cage according to claim 1, wherein the three-dimensional Helmholtz coil (70) comprises a three-dimensional coil winding (701) and a support (702) ; The three-dimensional coil winding (701) is composed of an annular X-direction coil (7011), a Y-direction coil (7012) and a Z-direction coil (7013), the maximum diameter is 430mm, and the uniform magnetic field area is greater than 100mm×100mm×100mm; the support (702 ) is made of industrial-grade acrylic material and is fixed in the uniform magnetic field area of the three-dimensional Helmholtz coil (70); the angle turntable (80) is fixed on the support (702); the probe of the magnetic method detector for the length of the steel cage to be inspected (100) is fixed in the rotation angle plate (80), and its measurement point is in the magnetic field uniform region of the three-dimensional Helmholtz coil (70); the high-precision fluxgate probe (90) is installed on the support (702) in the open slot inside. 4.根据权利要求1所述的钢筋笼长度磁法检测仪磁参量校准装置，其特征在于：所述的被检钢筋笼长度磁法检测仪探头(100)的磁场强度测量范围为±200000nT，直径范围10mm-50mm，分辨力优于10nT，转向差优于300nT，最大允许误差±150nT。4. The magnetic parameter calibration device of the magnetic method detector for the length of the steel bar cage according to claim 1, characterized in that: the measuring range of the magnetic field strength of the probe (100) of the magnetic method detector for the length of the steel bar cage to be checked is ±200000nT, The diameter range is 10mm-50mm, the resolution is better than 10nT, the steering difference is better than 300nT, and the maximum allowable error is ±150nT. 5.一种利用权利要求1所述的钢筋笼长度磁法检测仪磁参量校准装置对钢筋笼长度磁法检测仪磁参量校准的方法，其特征在于：所述的方法包括按顺序进行的下列步骤：5. A method for calibrating the magnetic parameters of the rebar cage length magnetic method detector using the rebar cage length magnetic method detector magnetic parameter calibration device according to claim 1, wherein the method comprises the following steps performed in order. step: 步骤1：将钢筋笼长度磁法检测仪磁参量校准装置上各部件依次连接，调节并固定高精度磁通门计探头(90)和被检钢筋笼长度磁法检测仪探头(100)，使其测量点处于三维亥姆霍兹线圈(70)的磁场均匀区内，高精度磁通门计探头(90)的XYZ测量轴分别与三维线圈绕组(701)的xyz方向一一对应，被检钢筋笼长度磁法检测仪探头(100)与X方向线圈(7011)平行；Step 1: Connect the various components on the magnetic parameter calibration device of the magnetic method detector for the length of the rebar cage in sequence, adjust and fix the probe (90) of the high-precision fluxgate meter and the probe (100) of the magnetic method detector for the length of the rebar cage to be inspected, so that the The measurement point is in the uniform magnetic field area of the three-dimensional Helmholtz coil (70), and the XYZ measurement axes of the high-precision fluxgate probe (90) correspond to the xyz directions of the three-dimensional coil winding (701) one-to-one respectively. The probe (100) of the magnetic method detector for the length of the steel cage is parallel to the X-direction coil (7011); 步骤2：将钢筋笼长度磁法检测仪磁参量校准装置通电预热，串口初始化，由笔记本电脑(10)采集圆柱形五层磁屏蔽筒(50)内三维线圈绕组(701)的x方向磁场强度，记录圆柱形五层屏蔽筒(50)内的本底磁场强度；Step 2: electrify and preheat the magnetic parameter calibration device of the rebar cage length magnetic method detector, initialize the serial port, and collect the x-direction magnetic field of the three-dimensional coil winding (701) in the cylindrical five-layer magnetic shielding cylinder (50) by the laptop computer (10). Intensity, record the background magnetic field intensity in the cylindrical five-layer shielding cylinder (50); 步骤3：利用笔记本电脑(10)将x方向磁场强度调整为0nT，通过调节直流恒流源组(30)电流大小给x方向磁场强度施加一个反方向磁场，使被检钢筋笼长度磁法检测仪探头(100)处于零磁场强度状态；Step 3: Use the notebook computer (10) to adjust the magnetic field strength in the x direction to 0nT, and apply a reverse magnetic field to the magnetic field strength in the x direction by adjusting the current of the DC constant current source group (30), so that the length of the steel cage to be inspected is detected by magnetic method. The instrument probe (100) is in a state of zero magnetic field strength; 步骤4:通过笔记本电脑(10)调节直流恒流源组(30)的电流使三维线圈绕组(701)的x方向磁场强度显示为-100000nT，记录被检钢筋笼磁法长度检测仪主机(110)显示的磁场强度示值，然后改变电流方向使x方向磁场强度显示为+100000nT，再次记录被检钢筋笼磁法长度检测仪主机(110)显示的磁场强度示值，被检钢筋笼磁法长度检测仪主机(110)两次示值区间即为被检钢筋笼磁法长度检测仪探头(100)的磁场强度测量范围；Step 4: Adjust the current of the DC constant current source group (30) through the notebook computer (10) so that the x-direction magnetic field strength of the three-dimensional coil winding (701) is displayed as -100000nT, and record the main body of the magnetic method length detector of the steel cage to be inspected (110 ), then change the direction of the current so that the magnetic field strength in the x-direction is +100000nT, and record the magnetic field strength indication displayed by the main unit (110) of the steel cage magnetic method length detector under test again. The two indication intervals of the main body of the length detector (110) are the measuring ranges of the magnetic field strength of the probe (100) of the magnetic method length detector of the steel cage to be inspected; 步骤5:通过笔记本电脑(10)调节直流恒流源组(30)的电流使三维线圈绕组(701)的x方向磁场强度以5nT的梯度步进变化，当被检钢筋笼磁法长度检测仪主机(110)显示的磁场强度示值发生改变时，三维线圈绕组(701)的x方向磁场强度总变化量即为被检钢筋笼磁法长度检测仪主机(110)的磁场强度分辨力；Step 5: Adjust the current of the DC constant current source group (30) through the notebook computer (10) so that the x-direction magnetic field strength of the three-dimensional coil winding (701) changes with a gradient of 5nT. When the indication value of the magnetic field intensity displayed by the host (110) changes, the total change amount of the magnetic field strength in the x-direction of the three-dimensional coil winding (701) is the magnetic field strength resolution of the host (110) of the magnetic method length detector of the steel cage under inspection; 步骤6:根据被检钢筋笼磁法长度检测仪探头(100)的磁场强度测量范围，在测量范围内均匀选取包含零点和满量程点在内的不少于7个校准点；通过笔记本电脑(10)调节直流恒流源组(30)的电流，使三维线圈绕组(701)的x方向产生各个校准点相应的磁场强度，磁场强度由高精度磁通门计探头(90)采集并由高精度磁通门计主机(20)显示，记录被检钢筋笼磁法长度检测仪主机(110)测得的磁场强度示值；Step 6: According to the measurement range of the magnetic field strength of the probe (100) of the magnetic method length detector of the steel cage under inspection, evenly select no less than 7 calibration points including the zero point and the full scale point within the measurement range; 10) Adjust the current of the DC constant current source group (30), so that the x-direction of the three-dimensional coil winding (701) generates the corresponding magnetic field strength of each calibration point. The main unit (20) of the precision fluxgate meter displays and records the indication value of the magnetic field intensity measured by the main unit (110) of the magnetic method length detector of the steel cage under inspection; 步骤7：按公式(1)计算被检钢筋笼磁法长度检测仪探头(100)的磁场强度示值误差，取各校准点的磁场强度示值误差绝对值最大值为被检钢筋笼磁法长度检测仪探头(100)磁场强度示值误差的校准结果；Step 7: Calculate the magnetic field strength indication error of the probe (100) of the magnetic method length detector of the steel cage under test according to formula (1), and take the maximum value of the absolute value of the error of the magnetic field strength indication value of each calibration point as the steel cage magnetic method under test. The calibration result of the indication error of the magnetic field strength of the length detector probe (100);
Figure FDA0002965509490000031
Figure FDA0002965509490000031
 式中：where: η——各校准点被检钢筋笼磁法长度检测仪探头(100)测得的磁场强度示值误差；η——Indication error of the magnetic field intensity measured by the probe (100) of the steel cage magnetic method length detector to be inspected at each calibration point; Bi——各校准点被检钢筋笼磁法长度检测仪主机(110)测得的磁场强度示值，nT；B i ——Indication value of the magnetic field intensity measured by the mainframe (110) of the magnetic method length detector of the steel cage to be inspected at each calibration point, nT; Bi0——各校准点三维线圈绕组(701)的X方向产生的相应磁场强度，nT；B i0 ——the corresponding magnetic field intensity generated in the X direction of the three-dimensional coil winding (701) at each calibration point, nT; BFS——被检钢筋笼磁法长度检测仪磁场强度测量范围，nT；B FS ——The measuring range of the magnetic field strength of the magnetic method length detector of the steel cage under inspection, nT; 步骤8:选取某一校准点，转动旋转角度盘(80)一周，分别记录被检钢筋笼磁法长度检测仪主机110在90°、180°、270°和360°的磁场强度示值，取最大值减最小值之差作为磁场强度转向差的校准结果。Step 8: Select a certain calibration point, rotate the rotation angle disc (80) for one week, and record the magnetic field strength indication values of the mainframe 110 of the checked steel cage magnetic method length detector at 90°, 180°, 270° and 360° respectively, and take The difference between the maximum value and the minimum value is used as the calibration result of the magnetic field strength steering difference.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117724028A (en) * 2024-01-16 2024-03-19 哈尔滨工业大学 Calibration system and calibration method for three-dimensional multi-point magnetic probe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712906A (en) * 1993-06-22 1995-01-17 Hitachi Ltd Coil for calibration of magnetic field measuring apparatus
CN101166411A (en) * 2006-10-18 2008-04-23 中国科学院高能物理研究所 A magnetic shielding device with multi-layer compound structure for shielding strong magnetic field
JP2011103319A (en) * 2009-11-10 2011-05-26 Seiko Epson Corp Active magnetic shield
CN108267157A (en) * 2018-03-21 2018-07-10 歌尔股份有限公司 The calibration method and calibrating installation of geomagnetic sensor
CN214308583U (en) * 2021-03-08 2021-09-28 交通运输部天津水运工程科学研究所 Calibration device for magnetic parameters of steel reinforcement cage length magnetic method detector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712906A (en) * 1993-06-22 1995-01-17 Hitachi Ltd Coil for calibration of magnetic field measuring apparatus
CN101166411A (en) * 2006-10-18 2008-04-23 中国科学院高能物理研究所 A magnetic shielding device with multi-layer compound structure for shielding strong magnetic field
JP2011103319A (en) * 2009-11-10 2011-05-26 Seiko Epson Corp Active magnetic shield
CN108267157A (en) * 2018-03-21 2018-07-10 歌尔股份有限公司 The calibration method and calibrating installation of geomagnetic sensor
CN214308583U (en) * 2021-03-08 2021-09-28 交通运输部天津水运工程科学研究所 Calibration device for magnetic parameters of steel reinforcement cage length magnetic method detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117724028A (en) * 2024-01-16 2024-03-19 哈尔滨工业大学 Calibration system and calibration method for three-dimensional multi-point magnetic probe

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