CN109540053B - Single-coil-based method for quickly measuring thickness of metal base material and surface non-metal coating - Google Patents
Single-coil-based method for quickly measuring thickness of metal base material and surface non-metal coating Download PDFInfo
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- CN109540053B CN109540053B CN201811630648.1A CN201811630648A CN109540053B CN 109540053 B CN109540053 B CN 109540053B CN 201811630648 A CN201811630648 A CN 201811630648A CN 109540053 B CN109540053 B CN 109540053B
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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
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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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
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
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Abstract
The invention discloses a method for quickly measuring the thickness of a metal base material and a surface non-metal coating based on a single coil.
Description
Technical Field
The invention relates to a nondestructive testing method, in particular to a method for quickly measuring the thickness of a metal base material and a surface non-metal coating based on a single coil.
Background
In the field of nondestructive testing, at present, two detection instruments are required to be respectively adopted for detecting the thickness of a metal material and the thickness of a non-metal coating on the surface, and the thickness value of the metal material and the thickness value of the non-metal coating on the surface can be finally obtained, so that the detection efficiency is low. Therefore, a fast measuring method capable of simultaneously obtaining the thickness information of the metal material and the surface non-metal coating is needed to be developed.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology part by a method for quickly measuring the thickness of a metal base material and a surface non-metal coating based on a single coil.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for quickly measuring the thickness of a metal base material and a surface non-metal coating based on a single coil is characterized by comprising the following steps of: comprises two processes of calibration and actual measurement,
the calibration process comprises the following steps of,
a. placing a permanent magnet and a detection coil arranged below the permanent magnet on the surface of a detected workpiece; the detection coil is electrically connected with the electromagnetic detector; the electromagnetic detector has a material sorting function;
b. adjusting the excitation frequency of the electromagnetic detector to the optimal test frequency for material sorting, and performing material sorting on the detected workpiece metal base material to obtain the material of the detected workpiece metal base material, namely simultaneously obtaining the sound velocity corresponding to the material of the detected workpiece metal base material;
c. b, adopting a material with the same material and structure as the detected workpiece metal base material obtained in the step b as a standard workpiece metal base material; adopting a material which is the same as the material of the non-metallic coating on the surface of the metal base material of the workpiece to be detected to manufacture a plurality of coating test pieces with different thicknesses;
d. covering a coating test piece on the surface of the metal base material of the standard workpiece, and placing the permanent magnet and the detection coil arranged below the permanent magnet in the step a on the surface of the coating test piece covered on the surface of the metal base material of the standard workpiece; exciting a detection coil by an electromagnetic detector to induce eddy current on the surface of the standard workpiece metal base material, acquiring and recording the eddy current density of the surface of the standard workpiece metal base material under the coating test piece with the current thickness, sequentially replacing a plurality of coating test pieces with different thicknesses to cover the surface of the standard workpiece metal base material, sequentially acquiring and recording the eddy current density of the surface of the standard workpiece metal base material under the coating test pieces with different thicknesses by the electromagnetic detector, and making a coating thickness-eddy current density relation curve;
the actual measurement process is that,
e. placing the permanent magnet and the detection coil arranged below the permanent magnet in the step a on the surface of the detected workpiece; firstly, adjusting the excitation frequency of an electromagnetic detector to be high-frequency alternating current, namely applying high-frequency alternating current excitation on a detection coil, generating high-frequency mechanical vibration on the surface of the detected workpiece metal base material and exciting electromagnetic ultrasonic waves under the action of a magnetic field of a permanent magnet, acquiring an electromagnetic ultrasonic echo signal reflected by the electromagnetic ultrasonic waves in the propagation process of the detected workpiece metal base material by the electromagnetic detector, and indirectly calculating the thickness value of the detected workpiece metal base material according to the time delay of the electromagnetic ultrasonic echo signal and the sound velocity corresponding to the material of the detected workpiece metal base material obtained in the step b; then reducing the excitation frequency of the electromagnetic detector, namely stopping exciting the electromagnetic ultrasonic waves, inducing eddy currents on the surface of the detected workpiece metal parent metal by the excitation detection coil of the electromagnetic detector, acquiring the eddy current density of the surface of the detected workpiece metal parent metal, and indirectly calculating according to the relation curve of the coating thickness and the eddy current density in the step d to obtain the thickness value of the nonmetal coating on the surface of the detected workpiece metal parent metal; therefore, only one detection is needed, the electromagnetic detector can simultaneously output the thickness value of the metal base material of the detected workpiece and the thickness value of the surface non-metal coating, and the rapid measurement of the thicknesses of the metal base material and the surface non-metal coating is realized.
Furthermore, after the material of the detected workpiece metal base material is obtained in the step b, the electromagnetic detector can automatically set electromagnetic ultrasonic thickness measurement parameters of the detected workpiece metal base material, so that the thickness information of the detected workpiece metal base material can be quickly obtained.
The method has the advantages that the thickness information of the metal base material and the surface non-metal coating is obtained simultaneously by adopting the single detection coil under the permanent magnet, the thickness of the metal base material and the thickness of the surface non-metal coating are rapidly measured, different detection instruments are not needed to measure the thickness of the metal base material and the thickness of the surface non-metal coating respectively, and the method is rapid, accurate and effective.
The present invention will be described in further detail with reference to examples, but the method for rapidly measuring the thickness of the metal base material and the surface non-metal coating layer by a single coil according to the present invention is not limited to the examples.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic diagram of a method for rapidly measuring thickness of a metal base material and a surface non-metal coating based on a single coil according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the detection of a plurality of coated test pieces with different thicknesses in the calibration process according to the embodiment of the present invention.
FIG. 3 is a graph showing the coating thickness-eddy current density relationship for an example of the present invention.
In the figure, 1, a permanent magnet, 2, a detection coil, 3, an electromagnetic detector, 4, a detected workpiece, 40 a non-metal coating on the surface of a detected workpiece metal base material, 41, a detected workpiece metal base material, 5, a standard workpiece metal base material, D1/D2/D3/Dn. coating test pieces with different thicknesses, D, coating thickness and Q, eddy current density.
Detailed Description
In an embodiment, as shown in fig. 1, 2 and 3, a method for rapidly measuring thickness of a metal base material and a surface non-metal coating based on a single coil is characterized in that: comprises two processes of calibration and actual measurement,
the calibration process comprises the following steps of,
a. placing a permanent magnet 1 and a detection coil 2 arranged below the permanent magnet 1 on the surface of a detected workpiece 4; the detection coil 2 is electrically connected with the electromagnetic detector 3; the electromagnetic detector 3 has a material sorting function;
b. adjusting the excitation frequency of the electromagnetic detector 3 to the optimum test frequency for material sorting, and sorting the material of the detected workpiece metal base material 41 to obtain the material of the detected workpiece metal base material 41, namely, the sound velocity corresponding to the material of the detected workpiece metal base material 41;
c. b, adopting a material with the same material and structure as the detected workpiece metal base material 41 obtained in the step b as a standard workpiece metal base material 5; adopting the same material as the nonmetal coating 40 on the surface of the metal base material of the detected workpiece to manufacture a plurality of coating test pieces D1/D2/D3/Dn with different thicknesses;
d. covering a coating test piece (D1) on the surface of the standard workpiece metal base material 5, and placing the permanent magnet 1 and the detection coil 2 arranged below the permanent magnet 1 in the step a on the surface of the coating test piece (D1) covered on the surface of the standard workpiece metal base material 5; exciting the detection coil 2 by the electromagnetic detector 3 to induce eddy current on the surface of the standard workpiece metal base material 5, acquiring and recording the eddy current density of the surface of the standard workpiece metal base material 5 under a coating test piece (D1) with the current thickness, then sequentially replacing a plurality of coating test pieces (D2/D3/Dn) with different thicknesses to cover the surface of the standard workpiece metal base material 5, sequentially acquiring and recording the eddy current density of the surface of the standard workpiece metal base material 5 under the coating test pieces D1/D2/D3/Dn with different thicknesses by the electromagnetic detector 3, and making a relation curve of coating thickness-eddy current density (D-Q);
the actual measurement process is that,
e. placing the permanent magnet 1 and the detection coil 2 arranged below the permanent magnet 1 in the step a on the surface of the detected workpiece 4; firstly, adjusting the excitation frequency of an electromagnetic detector 3 to be high-frequency alternating current, namely applying high-frequency alternating current excitation on a detection coil 2, generating high-frequency mechanical vibration on the surface of the detected workpiece metal parent metal 41 and exciting electromagnetic ultrasonic waves under the action of a magnetic field of a permanent magnet 1, acquiring an electromagnetic ultrasonic echo signal reflected by the electromagnetic ultrasonic waves in the propagation process of the detected workpiece metal parent metal 41 by the electromagnetic detector 3, and indirectly calculating according to the time delay of the electromagnetic ultrasonic echo signal and the sound velocity corresponding to the material of the detected workpiece metal parent metal 41 obtained in the step b to obtain the thickness value of the detected workpiece metal parent metal 41; then, reducing the excitation frequency of the electromagnetic detector 3, namely stopping exciting the electromagnetic ultrasonic waves, exciting the detection coil 2 by the electromagnetic detector 3 to induce eddy current on the surface of the detected workpiece metal parent metal 41, acquiring the eddy current density on the surface of the detected workpiece metal parent metal 41, and indirectly calculating according to the relation curve of the coating thickness and the eddy current density (D-Q) in the step D to obtain the thickness value of the nonmetal coating 40 on the surface of the detected workpiece metal parent metal; in this way, only one detection is needed, the electromagnetic detector 3 can output the thickness value of the metal base material 41 and the thickness value of the surface non-metal coating 40 of the detected workpiece at the same time, and the thickness of the metal base material and the thickness of the surface non-metal coating can be rapidly measured.
Further, after the material of the detected workpiece metal base material 41 is obtained in step b, the electromagnetic measuring instrument 3 may automatically set the electromagnetic ultrasonic thickness measurement parameters of the detected workpiece metal base material 41, so as to quickly obtain the thickness information of the detected workpiece metal base material 41.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (1)
1. A method for quickly measuring the thickness of a metal base material and a surface non-metal coating based on a single coil is characterized by comprising the following steps of: comprises two processes of calibration and actual measurement,
the calibration process comprises the following steps of,
a. placing a permanent magnet and a detection coil arranged below the permanent magnet on the surface of a detected workpiece; the detection coil is electrically connected with the electromagnetic detector; the electromagnetic detector has a material sorting function;
b. adjusting the excitation frequency of an electromagnetic detector to the optimal test frequency for material sorting, and sorting the material of the detected workpiece metal parent metal to obtain the material of the detected workpiece metal parent metal, namely simultaneously obtaining the sound velocity corresponding to the material of the detected workpiece metal parent metal, wherein the electromagnetic detector can automatically set electromagnetic ultrasonic thickness measurement parameters of the detected workpiece metal parent metal so as to quickly obtain the thickness information of the detected workpiece metal parent metal;
c. b, adopting a material with the same material and structure as the detected workpiece metal base material obtained in the step b as a standard workpiece metal base material; adopting a material which is the same as the material of the non-metallic coating on the surface of the metal base material of the workpiece to be detected to manufacture a plurality of coating test pieces with different thicknesses;
d. covering a coating test piece on the surface of the metal base material of the standard workpiece, and placing the permanent magnet and the detection coil arranged below the permanent magnet in the step a on the surface of the coating test piece covered on the surface of the metal base material of the standard workpiece; exciting a detection coil by an electromagnetic detector to induce eddy current on the surface of the standard workpiece metal base material, acquiring and recording the eddy current density of the surface of the standard workpiece metal base material under the coating test piece with the current thickness, sequentially replacing a plurality of coating test pieces with different thicknesses to cover the surface of the standard workpiece metal base material, sequentially acquiring and recording the eddy current density of the surface of the standard workpiece metal base material under the coating test pieces with different thicknesses by the electromagnetic detector, and making a coating thickness-eddy current density relation curve;
the actual measurement process is that,
e. placing the permanent magnet and the detection coil arranged below the permanent magnet in the step a on the surface of the detected workpiece; firstly, adjusting the excitation frequency of an electromagnetic detector to be high-frequency alternating current, namely applying high-frequency alternating current excitation on a detection coil, generating high-frequency mechanical vibration on the surface of the detected workpiece metal base material and exciting electromagnetic ultrasonic waves under the action of a magnetic field of a permanent magnet, acquiring an electromagnetic ultrasonic echo signal reflected by the electromagnetic ultrasonic waves in the propagation process of the detected workpiece metal base material by the electromagnetic detector, and indirectly calculating the thickness value of the detected workpiece metal base material according to the time delay of the electromagnetic ultrasonic echo signal and the sound velocity corresponding to the material of the detected workpiece metal base material obtained in the step b; then reducing the excitation frequency of the electromagnetic detector, namely stopping exciting the electromagnetic ultrasonic waves, inducing eddy currents on the surface of the detected workpiece metal parent metal by the excitation detection coil of the electromagnetic detector, acquiring the eddy current density of the surface of the detected workpiece metal parent metal, and indirectly calculating according to the relation curve of the coating thickness and the eddy current density in the step d to obtain the thickness value of the nonmetal coating on the surface of the detected workpiece metal parent metal; therefore, only one detection is needed, the electromagnetic detector can simultaneously output the thickness value of the metal base material of the detected workpiece and the thickness value of the surface non-metal coating, and the rapid measurement of the thicknesses of the metal base material and the surface non-metal coating is realized.
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| CN111043947A (en) * | 2019-12-30 | 2020-04-21 | 爱德森（厦门）电子有限公司 | Nuclear fuel assembly oxide film thickness eddy current testing device |
| CN112444219B (en) * | 2020-12-31 | 2023-07-25 | 爱德森（厦门）电子有限公司 | Non-contact ultrasonic electromagnetic coating thickness measuring method and detection device thereof |
| CN113776419A (en) * | 2021-08-07 | 2021-12-10 | 爱德森（厦门）电子有限公司 | Method and device for measuring thickness of eddy current coating by using bicrystal ultrasonic sensor for auxiliary triggering |
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Patent Citations (5)
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| EP1503169A2 (en) * | 2003-07-29 | 2005-02-02 | Kansai Paint Co., Ltd. | Electrodeposition characteristic measuring device, evaluation method, and control method |
| CN101131314A (en) * | 2006-08-22 | 2008-02-27 | 爱德森（厦门）电子有限公司 | Nondestructive thickness measuring method for nickel coat on Fe substrate |
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