CN111023960B - Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material - Google Patents
Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material Download PDFInfo
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- CN111023960B CN111023960B CN201911419488.0A CN201911419488A CN111023960B CN 111023960 B CN111023960 B CN 111023960B CN 201911419488 A CN201911419488 A CN 201911419488A CN 111023960 B CN111023960 B CN 111023960B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
Abstract
The invention discloses a non-contact paint film thickness nondestructive testing system and a non-contact paint film thickness nondestructive testing method based on a transparent conductive film electrode material, and belongs to the field of paint film thickness measurement. The detection system is provided with a transparent conductive film electrode material at the intersection of a longitudinal light path emitted by a confocal probe and a path of transverse electromagnetic waves emitted by an eddy current probe; by utilizing the conductivity and the light transmittance of the transparent electrode, the confocal probe and the eddy current probe can simultaneously measure the upper surface and the lower surface of the same region to be detected in the paint film to be detected, thereby realizing non-contact detection. By using the detection method of the detection system, the influence of the detection distance on the result of the eddy current probe in the non-contact measurement process is eliminated by performing calibration operation on the eddy current probe, and the thickness of the paint film to be detected is measured in a non-contact manner by result calibration of the eddy current probe. The invention realizes the non-contact nondestructive detection of the thickness of the paint film and has wide application prospect.
Description
Technical Field
The invention belongs to the field of paint film thickness measurement, and relates to a non-contact paint film thickness nondestructive detection system and a non-contact paint film thickness nondestructive detection method based on a transparent conductive film electrode material.
Background
In order to meet the anticorrosive requirement of appearance metals such as locomotives, vehicles and the like and the strong pursuit of the modern society for individuation and beautification of patterns, anticorrosive paint films or decorative paint films are often sprayed on the outer surfaces of vehicles and metal workpieces. The thickness detection of the coating is an important index for measuring the isolation capability, the service life and the spraying quality of the coating. An unreasonable coating thickness can produce coating defects such as sagging, blossoming, etc., affect the appearance quality of the paint film, and increase the cost of spraying. Therefore, the accurate measurement of the thickness of the paint film is of great significance to the traditional processing industry and the vehicle field.
At present, the traditional paint film thickness measuring method mainly comprises a wet film method and a dry film method. The wet film method is mainly based on a wet film thickness measurement method. The wet film method can measure a flat surface or a curved surface, but the paint surface needs to be damaged in the measuring process, and the measuring process is local sampling, so that the method is not suitable for measuring the thickness of a paint film with a large area. The dry film measurement comprises a magnetic thickness measurement method, a magneto-resistance electromagnetic induction thickness measurement method, an isotope X-ray fluorescence thickness measurement method, a cross section thickness microscope measurement method and an eddy current method paint film thickness gauge. The magnetic thickness measurement method is low in price, simple in structure and free of calibration in measurement, but only can be used for measuring the thickness of a non-magnetic paint film, and the unevenness of the surface of the paint film, the curvature, the thickness of a workpiece and the content of metal elements in a measured substrate can influence the measurement result; the magneto-resistance method electromagnetic induction thickness measurement method has higher measurement precision, but is only suitable for the thickness measurement of the paint film of the magnetic conductive material; the isotope X-ray fluorescence thickness measurement method has high measurement precision, has an automatic spectrum stabilization function, does not need frequent correction, and is widely applied to the measurement of the thickness of a zinc coating, but has complex equipment structure, larger volume and high price; the cross section thickness microscope measuring method has high measuring precision, but a V-shaped groove needs to be cut on the surface of the base material, the measuring steps are complicated, the measured matrix is damaged, and the thickness of the paint film at a local position can only be measured; the eddy current method paint film thickness gauge is the most mainstream method for measuring the paint film thickness at present, can measure the paint film thickness of a non-magnetizer material, and has the characteristic of high measurement precision, however, a detector needs to be tightly attached to the surface of the paint film in the measurement process, and iron oxide red and aluminum powder in the paint can influence the measurement result.
In summary, most of the existing paint film thickness measuring instruments need to tightly attach the detector to the surface of the paint film to be measured or damage the substrate material in the measuring process, and when the detector moves on the surface of the paint film to be measured, the detector is very easy to scratch and scratch on the paint surface, so that non-contact and high-precision nondestructive measurement of the paint film thickness cannot be realized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a non-contact paint film thickness nondestructive testing system and a non-contact paint film thickness nondestructive testing method based on a transparent conductive film electrode material, so that the limitation that the detection can be implemented only by tightly attaching a detector to the surface of a paint film to be tested in the existing paint film thickness measuring method is solved.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a non-contact paint film thickness nondestructive testing system based on a transparent conductive film electrode material, which comprises a confocal measuring probe and an eddy current measuring probe;
the longitudinal light path emitted by the confocal probe is perpendicular to the upper surface of the paint film to be detected, the transverse electromagnetic wave emitted by the eddy current probe is parallel to the upper surface of the paint film to be detected, and a transparent conductive film electrode material is arranged at the intersection of the longitudinal light path emitted by the confocal probe and the transverse electromagnetic wave emitted by the eddy current probe.
Preferably, the transparent conductive film electrode material and the paint film to be detected form an included angle of 45 degrees.
Preferably, the system further comprises an automatic controller electrically connected with the confocal measuring probe and the eddy current measuring probe; the automatic controller is used for collecting and processing detection signals of the confocal probe and the eddy current probe.
The invention also discloses a detection method of the non-contact paint film thickness nondestructive detection system based on the transparent conductive film electrode material, which comprises the following steps:
1) carrying out calibration operation on the eddy current probe to obtain an output indication calibration relation;
2) measuring the distance from the upper surface of the paint film to be measured to a confocal probe by using the confocal probe;
3) obtaining a distance output reading from the lower surface of the paint film to be detected to the eddy current probe by using the eddy current probe;
4) and (3) carrying out data calibration on the measurement distance of the confocal probe and the distance output readings of the eddy current probe by utilizing the output reading calibration relation obtained in the step 1) to obtain the thickness of the paint film to be measured.
Preferably, the calibration operation in step 1) includes the following steps:
a) detecting a plurality of groups of paint film samples with known thicknesses but different thicknesses by using an eddy current probe, recording output readings of the eddy current probe corresponding to the paint film samples with different paint film thicknesses, and calculating to obtain a relation curve between the different paint film thicknesses and the output readings of the eddy current probe; in the process, the detection distance between the eddy current probe and the paint film sample is kept consistent;
b) selecting a paint film sample with known thickness for detection, changing the distance between the eddy current probe and the paint film sample, recording the output readings of the corresponding eddy current probe at different distances, and calculating to obtain a relation curve between different detection distances and the output readings of the eddy current probe.
Preferably, the thickness of the paint film sample is measured using wet film thickness measurement or cross-sectional thickness microscopy.
Preferably, the data calibration of step 4) comprises:
s1, recording the distance from the upper surface of a paint film to be measured to a confocal probe as h1+ h2 by using the confocal probe, and keeping h1 unchanged in the measurement process to obtain h 2;
s2, measuring the distance from the lower surface of the paint film to be measured to the eddy current probe by using the eddy current probe, and recording the output reading of the eddy current probe as Out234H2+ h3+ h4, wherein h3 is kept unchanged in the measurement process, and the output reading Out of the eddy current probe is obtained24＝h2+h4；
S3, combining the relationship between the output readings of the eddy current probe obtained by the calibration operation and different detection distances, namely Out2H2 in relation to h2 to yield Out4＝h4；
S4, combining the relationship between the output readings of the eddy current probe obtained by the calibration operation and different paint film thicknesses, namely Out4Obtaining the thickness h4 of the paint film to be measured according to the relation between h4 and h 4;
wherein, the distance between the confocal probe and the transparent conductive film electrode material is defined as h 1; the distance between the eddy current probe and the transparent conductive film electrode material is h 3; the distance from the transparent conductive film electrode material to the upper surface of the paint film to be detected is h2, and the thickness of the paint film to be detected is h 4.
Compared with the prior art, the invention has the following beneficial effects:
in the non-contact paint film thickness nondestructive testing system based on the transparent conductive thin film electrode material, by utilizing the conductivity of the transparent conductive thin film electrode material, electromagnetic waves horizontally emitted by an eddy current probe of an eddy current measuring instrument deflect when passing through the transparent thin film electrode material and vertically enter a metal layer on the lower surface of a paint film to be tested, and by utilizing the light transmittance of the transparent electrode material, a light path emitted by a confocal probe of the confocal measuring instrument vertically irradiates the upper surface of the paint film to be tested through the transparent conductive thin film electrode material, so that the confocal probe is overlapped with a measuring area of the eddy current probe, and the upper surface and the lower surface of the paint film to be tested are measured at the same time, thereby realizing the non-contact paint film thickness nondestructive testing.
Furthermore, the transparent conductive film electrode material and the paint film to be measured are arranged in an included angle of 45 degrees, so that a light path which penetrates through the transparent electrode material and an electromagnetic wave path which deflects through the transparent conductive film electrode material can be overlapped, and the overlapping accuracy of a measurement area is improved.
Furthermore, by combining with an automatic control technology, the measuring efficiency can be improved, and the rapid and non-contact measurement of the thickness of the paint film in a large paint surface area can be realized.
The invention discloses a detection method of a non-contact paint film thickness nondestructive detection system based on a transparent conductive film electrode material, which realizes the simultaneous measurement of the upper surface and the lower surface of a detection area of a paint film to be detected through the non-contact paint film thickness nondestructive detection system based on the transparent conductive film electrode material. Therefore, the non-contact paint film thickness nondestructive testing method based on the transparent conductive film electrode material disclosed by the invention does not need to enable a traditional paint film thickness detector to be tightly attached to the paint surface to be tested, so that the abrasion and scratch of the paint surface in the detection process are avoided.
Further, the eddy current probe is calibrated to obtain the relationship between different paint film thicknesses and the output readings of the eddy current probe and the relationship between different detection distances and the output readings of the eddy current probe. And data calibration is carried out by combining with the actual measurement process, the distance from the upper surface of the paint film to be measured, which is measured by the confocal probe, to the confocal probe, the output reading of the distance from the lower surface of the paint film to be measured, which is measured by the eddy current probe, to the eddy current probe and the relation result obtained by the calibration operation are combined, the influence of the detection distance on the eddy current probe result in the non-contact measurement process is eliminated, and the non-contact measurement precision can be improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a measurement flow chart of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the non-contact paint film thickness nondestructive testing system based on the transparent conductive thin film electrode material disclosed by the invention comprises a confocal measuring probe and an eddy current measuring probe;
the longitudinal light path emitted by the confocal probe is perpendicular to the upper surface of the paint film to be measured, the transverse electromagnetic wave emitted by the eddy current probe of the eddy current measuring instrument is parallel to the upper surface of the paint film to be measured, and a transparent conductive film electrode material is arranged at the intersection of the longitudinal light path emitted by the confocal probe and the transverse electromagnetic wave emitted by the eddy current probe.
Preferably, the transparent conductive film electrode material and the paint film to be detected form an included angle of 45 degrees.
Preferably, the nondestructive testing system for the thickness of the paint film based on the transparent conductive thin film electrode material further comprises an automatic controller electrically connected with the confocal measuring probe and the eddy current measuring probe; the automatic controller is used for collecting and processing detection signals of the confocal probe and the eddy current probe.
The invention discloses a detection method of a non-contact paint film thickness nondestructive detection system based on a transparent conductive film electrode material, which comprises the steps of measuring the distance from the lower surface of a paint film to be detected to an eddy current probe by using the eddy current probe; obtaining the distance from the upper surface of the paint film to be detected to a confocal probe by using the confocal probe; the coincidence of the measurement area of the confocal probe and the measurement area of the eddy current measuring instrument is realized by utilizing the good light transmittance and conductivity of the transparent electrode; based on the relationship between the detection distance of the eddy current probe and the output readings obtained by calibration, the influence of the fluctuation of the detection distance on the eddy current detection result is eliminated according to the actual detection distance obtained by confocal measurement, then the actual thickness of the paint film to be measured is obtained based on the relationship between the thickness of the paint film obtained by calibration and the output readings of the eddy current probe, and finally the non-contact nondestructive measurement of the thickness of the paint film is realized.
The confocal probe (dispersive displacement type) emits monochromatic light with different colors to the upper surface of the paint film to be measured, and the transparent conductive film electrode material has good light transmittance, so that the monochromatic light is transmitted through the transparent conductive film electrode material and is irradiated on the upper surface of the paint film to be measured, and light with a certain wavelength is focused on the surface to be measured according to the confocal principle and passes through the transparent electrode material again to be reflected back to the confocal measuring probe, so that the distance from the upper surface of the paint film to be measured to the confocal probe is measured. The electric eddy current probe emits electromagnetic waves to the transparent electrode material, the transparent conductive film electrode material has good conductivity, the electromagnetic waves are deflected in the emission direction under the action of the transparent conductive film electrode material and vertically enter a paint film to be detected, due to the electric eddy current effect, the electromagnetic waves penetrate through the paint film layer to be detected and generate induced electric eddy currents in the metal base layer below, induced magnetic fields generated by the induced electric eddy currents are opposite to the magnetic field direction of the original electromagnetic waves, and are reflected back to the electric eddy current probe sensing unit under the action of the transparent conductive film electrode material again, so that the electric eddy current probe reading corresponding to the electromagnetic field propagation distance in the detection area is obtained.
In addition, the scheme is combined with an automatic control technology, and the automatic controller loaded with a program is used for finishing detection operation, so that the measurement efficiency is greatly improved, and the quick and high-precision measurement of the thickness of the paint film in a large paint surface area is realized.
Referring to fig. 1 and fig. 2, the invention discloses a detection method of a non-contact paint film thickness nondestructive detection system based on a transparent conductive thin film electrode material, which comprises the following steps:
step one, constructing a plurality of groups of paint film samples with known but different thicknesses, and measuring the thickness of each group of paint film samples by using a wet film thickness measuring method or a cross section thickness microscope measuring method;
step two, ensuring that the distance between the measuring equipment and the paint film sample is consistent, recording the output readings of the eddy current probe corresponding to the paint film samples with different paint film thicknesses, and calculating to obtain a relation curve between the different paint film thicknesses and the output readings of the eddy current probe;
selecting one paint film sample with known thickness for detection, changing the distance between the eddy current probe and the paint film sample, recording corresponding output readings of the eddy current probe at different distances, and calculating a relation curve between different detection distances and the output readings of the eddy current probe;
and fourthly, placing the non-contact paint film thickness nondestructive testing system based on the transparent conductive film electrode material above the paint film to be tested, measuring the distance between the confocal probe and the upper surface of the paint film to be tested, and correcting the output readings of the eddy current probe based on the distance. And (4) based on the corrected output readings of the eddy current probe, calibrating data by using the relation curve of the paint film thickness obtained in the step three and the output readings of the eddy current probe, and calculating to obtain the actual paint film thickness to be measured.
The data calibration comprises the following calculation processes:
s1, measuring by using a confocal probe to obtain the distance from the upper surface of a paint film to be measured to the confocal probe, recording the distance as h1+ h2, and keeping h1 unchanged in the measurement process to obtain h 2;
s2, measuring the distance from the lower surface of the paint film to be measured to the eddy current probe by using the eddy current probe, and recording the output reading of the eddy current probe as Out234H2+ h3+ h4, wherein h3 is kept unchanged in the measurement process, and the output reading Out of the eddy current probe is obtained24＝h2+h4；
S3, combining the relationship between the output readings of the eddy current probe obtained by the calibration operation and different detection distances, namely Out2H2 in relation to h2 to yield Out4＝h4；
S4, combining the relationship between the output readings of the eddy current probe obtained by the calibration operation and different paint film thicknesses, namely Out4Obtaining the thickness h4 of the paint film to be measured according to the relation between h4 and h 4;
wherein, the distance between the confocal probe and the transparent conductive film electrode material is defined as h 1; the distance between the eddy current probe and the transparent conductive film electrode material is h 3; the distance from the transparent conductive film electrode material to the upper surface of the paint film to be detected is h2, and the thickness of the paint film to be detected is h 4.
Compared with the prior art, the invention realizes the coincidence of the measuring areas of two measuring devices by comprehensively utilizing confocal measurement and eddy current measurement and utilizing the transparent conductive film electrode material, and simultaneously measures the upper surface and the lower surface of the paint film, thereby realizing the non-contact and high-precision nondestructive detection of the paint film outside the vehicle and the workpiece and obviously improving the measuring precision. Compared with a paint film thickness gauge adopting an eddy current method, the measuring method provided by the invention keeps the same measuring precision, and meanwhile, a detector does not need to be tightly attached to the paint surface to be measured, so that the abrasion and scratch of the paint surface are avoided. In addition, by combining with an automatic control technology, the measuring efficiency can be greatly improved, and the quick and high-precision measurement of the thickness of the paint film in a large paint surface area is realized. In conclusion, the invention provides a brand-new detection system and method for detecting the thickness of the paint film, and the method has wide application prospect.
The above invention only reflects the basic idea of the patent, but in order to ensure the coincidence of the measurement areas of the two measurement probes, the implementation mode is not limited to the implementation of the deflection of the electromagnetic wave of the eddy current probe and the vertical incidence of the light of the confocal probe by using the transparent conductive film electrode material. Similarly, the multilayer dielectric film material can also be used for realizing the vertical incidence of the alternating magnetic field and the deflection incidence of the confocal probe light to ensure that the two measuring probes measure the same paint film parameter. The optical probe is not limited to a confocal probe, and may use an optical distance measurement principle such as triangulation.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A non-contact paint film thickness nondestructive testing system based on a transparent conductive film electrode material is characterized by comprising a confocal measuring probe and an eddy current measuring probe;
the device comprises a confocal probe, an eddy current probe, a transparent conductive film electrode material, a confocal probe, a photoelectric conversion device and a power supply, wherein a longitudinal light path emitted by the confocal probe is perpendicular to the upper surface of a paint film to be detected, a transverse electromagnetic wave emitted by the eddy current probe is parallel to the upper surface of the paint film to be detected, the transparent conductive film electrode material is arranged at the intersection of the longitudinal light path emitted by the confocal probe and the transverse electromagnetic wave emitted by the eddy current probe, and.
2. The transparent conductive thin film electrode material-based non-contact paint film thickness nondestructive testing system of claim 1, further comprising an automated controller electrically connected to the confocal measurement probe and the eddy current measurement probe; the automatic controller is used for collecting and processing detection signals of the confocal probe and the eddy current probe.
3. The detection method of the non-contact paint film thickness nondestructive detection system based on the transparent conductive thin film electrode material as claimed in claim 1 or 2 is characterized by comprising the following steps:
1) carrying out calibration operation on the eddy current probe to obtain an output indication calibration relation;
2) measuring the distance from the upper surface of the paint film to be measured to a confocal probe by using the confocal probe;
3) obtaining a distance output reading from the lower surface of the paint film to be detected to the eddy current probe by using the eddy current probe;
4) and (3) carrying out data calibration on the measurement distance of the confocal probe and the distance output readings of the eddy current probe by utilizing the output reading calibration relation obtained in the step 1) to obtain the thickness of the paint film to be measured.
4. The method for detecting the transparent conductive thin film electrode material-based non-contact paint film thickness nondestructive testing system according to claim 3, wherein the calibration operation of step 1) comprises the following steps:
a) detecting a plurality of groups of paint film samples with known thicknesses but different thicknesses by using an eddy current probe, recording output readings of the eddy current probe corresponding to the paint film samples with different paint film thicknesses, and calculating to obtain a relation curve between the different paint film thicknesses and the output readings of the eddy current probe; in the process, the detection distance between the eddy current probe and the paint film sample is kept consistent;
b) selecting a paint film sample with known thickness for detection, changing the distance between the eddy current probe and the paint film sample, recording the output readings of the corresponding eddy current probe at different distances, and calculating to obtain a relation curve between different detection distances and the output readings of the eddy current probe.
5. The method for detecting the transparent conductive thin film electrode material-based non-contact paint film thickness nondestructive testing system according to claim 4, characterized in that the thickness of the paint film sample is measured by wet film thickness measurement method or cross-section thickness microscope measurement method.
6. The method for detecting the transparent conductive thin film electrode material-based non-contact paint film thickness nondestructive testing system according to claim 3, wherein the data calibration of step 4) comprises:
s1: recording the distance from the upper surface of the paint film to be measured to the confocal probe as h1+ h2 by using the confocal probe, and keeping h1 unchanged in the measurement process to obtain h 2;
s2: measuring the distance from the lower surface of the paint film to be measured to the eddy current probe by using the eddy current probe, and recording the output reading of the eddy current probe as Out234H2+ h3+ h4, wherein h3 is kept unchanged in the measurement process, and the output reading Out of the eddy current probe is obtained24＝h2+h4；
S3: the relationship between the output readings of the eddy current probe obtained in conjunction with the calibration operation and the different detection distances, i.e. Out2H2 in relation to h2 to yield Out4＝h4；
S4: the relationship between the output readings of the eddy current probe obtained by combining with the calibration operation and the thickness of different paint films, namely Out4Obtaining the thickness h4 of the paint film to be measured according to the relation between h4 and h 4;
wherein, the distance between the confocal probe and the transparent conductive film electrode material is defined as h 1; the distance between the eddy current probe and the transparent conductive film electrode material is h 3; the distance from the transparent conductive film electrode material to the upper surface of the paint film to be detected is h2, and the thickness of the paint film to be detected is h 4.
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