CN115164760A - Device and method for detecting surface crack depth of metal material - Google Patents
Device and method for detecting surface crack depth of metal material Download PDFInfo
- Publication number
- CN115164760A CN115164760A CN202210649830.1A CN202210649830A CN115164760A CN 115164760 A CN115164760 A CN 115164760A CN 202210649830 A CN202210649830 A CN 202210649830A CN 115164760 A CN115164760 A CN 115164760A
- Authority
- CN
- China
- Prior art keywords
- crack
- fluorescence
- intensity
- module
- depth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007769 metal material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 59
- 238000004364 calculation method Methods 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims description 36
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 12
- 230000006378 damage Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- 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
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The application discloses a device and a method for detecting the surface crack depth of a metal material, relates to the technical field of crack detection, and can solve the problems of multiple interference factors, inaccurate measurement, complex detection device and low practicability in crack depth detection. The detection device comprises: the device comprises a fluorescence generation module, a fluorescence intensity detection module and a crack depth calculation module; the fluorescence generation module is used for generating visible fluorescence on the surface of the crack; the fluorescence intensity detection module is connected with the fluorescence generation module and used for receiving the visible fluorescence and detecting the intensity of the visible fluorescence; the crack depth calculation module is connected with the fluorescence intensity detection module and used for converting the intensity of the visible fluorescence into the crack area and calculating the crack depth according to the crack area and the crack length.
Description
Technical Field
The application relates to the technical field of crack detection, in particular to a device and a method for detecting the surface crack depth of a metal material.
Background
Metal materials are widely applied to manufacturing of various devices, cracks are often generated on the surface of the devices under the influence of abrasion, external force and fatigue in the operation process, the damage of the cracks is extremely large, and the crack depth needs to be determined because the crack depth parameter is a main influence factor for evaluating the damage of the cracks.
The principle of the existing metal material surface crack depth detection method is mainly an electromagnetic induction type, but the technology has the problems of multiple interference factors, inaccurate measurement and the like in actual detection due to the fact that the related parameters are multiple, and a detection device is complex and not high in practicability.
Disclosure of Invention
In view of this, the present application provides a device and a method for detecting a crack depth on a surface of a metal material, which can solve the problems of a large number of interference factors, inaccurate measurement, complex detection device and low practicability in crack depth detection.
In order to achieve the above object, the present application provides a device for detecting a crack depth on a surface of a metal material, comprising: the device comprises a fluorescence generation module, a fluorescence intensity detection module and a crack depth calculation module;
the fluorescence generation module is used for generating visible fluorescence on the surface of the crack;
the fluorescence intensity detection module is connected with the fluorescence generation module and used for receiving the visible fluorescence and detecting the intensity of the visible fluorescence;
the crack depth calculation module is connected with the fluorescence intensity detection module and used for converting the intensity of the visible fluorescence into a crack area and calculating the crack depth according to the crack area and the crack length.
Optionally, the fluorescence generation module comprises: a magnetometer, an ultraviolet lamp;
two electrodes of the magnetometer are arranged on two sides of the crack and used for generating a leakage magnetic field on the surface of the crack;
and placing a magnetic fluorescent substance on the surface of the crack, and irradiating the magnetic fluorescent substance adsorbed on the surface of the crack by the ultraviolet lamp to display visible fluorescence on the surface of the crack.
Optionally, the detection apparatus further comprises: a display module;
and the display module is connected with the crack depth calculation module and is used for displaying the crack depth value.
Optionally, the detection apparatus further comprises: a power supply module;
the power module is respectively connected with the fluorescence intensity detection module, the crack depth calculation module and the display module and is used for supplying power to the detection device.
According to another aspect of the present application, there is also provided a method for detecting a crack depth on a surface of a metal material, the method being applied to the above detection apparatus, and including:
detecting the intensity of visible fluorescence generated by the magnetic fluorescent substance on the surface of the crack, and determining the area of the crack according to the intensity of the visible fluorescence;
and calculating the ratio of the crack area to the crack length to obtain the crack depth.
Preferably, the determining the crack area according to the intensity of the visible fluorescence comprises:
and calculating the crack area corresponding to the intensity of the visible fluorescence by utilizing the functional relation between the intensity of the visible fluorescence and the crack area.
The application provides a detection device and a method for the surface crack depth of a metal material, wherein the detection device comprises: the device comprises a fluorescence generation module, a fluorescence intensity detection module and a crack depth calculation module; the fluorescence generation module is used for generating visible fluorescence on the surface of the crack; the fluorescence intensity detection module is connected with the fluorescence generation module and used for receiving the visible fluorescence and detecting the intensity of the visible fluorescence; the crack depth calculation module is connected with the fluorescence intensity detection module and used for converting the intensity of visible fluorescence into crack area and calculating the crack depth according to the crack area and the crack length. The crack is regarded as a defect with great harm and is regarded as a planar defect in the detection industry, namely a two-dimensional defect, when the harmfulness of the crack is quantified, the opening width of the crack is generally not considered, and only the measured parameters are length and depth, so the technical scheme in the application utilizes the principle that the deeper the crack depth is, the more the magnetic fluorescent substance is adsorbed on the surface of the crack, and the more the magnetic fluorescent substance is adsorbed, and the stronger the intensity of the visible fluorescence of the magnetic fluorescent substance is, measures the intensity of the visible fluorescence of the magnetic fluorescent substance adsorbed on the surface of the crack by utilizing the principle that the stronger the intensity of the visible fluorescence of the crack is, can directly convert the intensity of the visible fluorescence into the crack area according to the functional relation between the intensity of the visible fluorescence and the crack area, and the crack length can be measured only by utilizing tools such as a ruler and the like on site.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram illustrating an apparatus for detecting a crack depth on a surface of a metal material according to an embodiment of the present invention;
FIG. 2 is a schematic physical diagram of a device for detecting the crack depth on the surface of a metal material according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for detecting the crack depth on the surface of a metal material according to an embodiment of the present invention;
FIG. 4 is a graph showing fluorescence intensity as a function of crack area provided by an embodiment of the present invention;
in the figure;
1-fluorescence generation module, 11-magnetometer, 12-ultraviolet lamp;
2-a fluorescence intensity detection module;
3-a crack depth calculation module;
4-a display module;
5-a power supply module;
6-a metal material;
7-a magnetic fluorescent substance;
8-crack depth detector.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention will be described in detail hereinafter with reference to the drawings and embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following describes a device for detecting the crack depth on the surface of a metal material according to some embodiments of the present invention with reference to fig. 1 and 2.
The embodiment of the application provides a detection device for the surface crack depth of a metal material, as shown in fig. 1, the detection device comprises: the device comprises a fluorescence generation module 1, a fluorescence intensity detection module 2 and a crack depth calculation module 3; the fluorescence generation module 1 is used for generating visible fluorescence on the surface of the crack; the fluorescence intensity detection module 2 is connected with the fluorescence generation module 1 and used for receiving visible fluorescence and detecting the intensity of the visible fluorescence; the crack depth calculating module 3 is connected with the fluorescence intensity detecting module 2 and is used for converting the intensity of the visible fluorescence into the crack area and calculating the crack depth according to the crack area and the crack length.
As shown in fig. 2, the crack is regarded as a defect with great damage in the detection industry as a planar defect, i.e. a two-dimensional defect, and when the harmfulness of the crack is quantified, the opening width of the crack is generally not considered, and only the length and the depth need to be measured as parameters, so according to the technical scheme in the application, the deeper the crack depth is, the more the magnetic fluorescent substance 7 is adsorbed on the crack surface, and the more the magnetic fluorescent substance 7 is adsorbed, the stronger the intensity of the visible fluorescence of the magnetic fluorescent substance 7 is, by measuring the intensity of the visible fluorescence of the magnetic fluorescent substance 7 adsorbed on the crack surface, the intensity of the visible fluorescence can be directly converted into the crack area according to the functional relationship between the intensity of the visible fluorescence and the crack area, and the crack length can be measured only by using tools such as a ruler and the like on site, the measurement is simple, further, the crack area is calculated to be divided by the crack length, and the obtained value is the crack depth, which is simple, easy, accurate, simple, and easy to solve the problems that the existing detection device is too complex in structure, not strong in practicality, and inaccurate and measurement.
Accordingly, as shown in fig. 1 and 2, the fluorescence generation module comprises: a magnetometer 11, an ultraviolet lamp 12; two electrodes of the magnetometer 11 are arranged on two sides of the crack and used for generating a leakage magnetic field on the surface of the crack; and (3) placing a magnetic fluorescent substance on the surface of the crack, and irradiating the magnetic fluorescent substance 7 adsorbed on the surface of the crack by an ultraviolet lamp 12 to display visible fluorescence on the surface of the crack.
As shown in fig. 2, the specific visible fluorescence generation process is as follows: after the surface of the metal material 6 is cracked, firstly, two electrodes of a magnetometer 11 are placed on two sides of the crack, so that a leakage magnetic field is generated on the surface of the crack, meanwhile, a magnetic fluorescent substance 7 is sprayed on the crack, the magnetic fluorescent substance 7 is adsorbed on the surface of the crack after waiting for about 3 seconds to form a magnetic mark display, then, an ultraviolet lamp 12 is used for irradiating the surface of the crack, and the magnetic fluorescent substance on the surface of the crack can emit yellow green visible light.
In a specific application scenario, in order to visually display the value of the crack depth, as shown in fig. 1, a display module 4 may be further added; the display module 4 is connected with the crack depth calculation module 3 and is used for displaying the crack depth value.
As shown in fig. 2, the crack depth detector 8 is placed above the crack surface, the detection head of the crack depth detector 8 is in contact with the crack surface, and the detector displays the crack depth below, and the crack depth detector 8 includes: the device comprises a fluorescence intensity detection module 2, a crack depth calculation module 3 and a display module 4, wherein the fluorescence intensity of the magnetic fluorescent substance adsorbed on the surface of the crack is measured through the fluorescence intensity detection module 2, after the fluorescence intensity is measured, the crack depth module 3 is used for calculating the crack area on the surface of the metal material 6 according to the function relation between the fluorescence intensity and the crack area, calculating the crack area and dividing the crack area by the crack length according to the input crack length to obtain the crack depth, and then the display module 4 is used for displaying the value of the crack depth.
In a specific application scenario, as shown in fig. 1, the detection apparatus further includes: a power supply module 5; the power module 5 is respectively connected with the fluorescence intensity detection module 2, the crack depth calculation module 3 and the display module 4, and is used for supplying power to the detection device, so that the safe and stable operation of the detection device is ensured.
The detection principle of the detection device for the surface crack depth of the metal material provided by the embodiment of the application is as follows:
as shown in fig. 1 and 2, once a crack occurs on the surface of the metal material, discontinuity occurs in the surface structure, and when the discontinuity is in a magnetic field, a leakage magnetic field is generated on the surface, so that a magnetic substance can be adsorbed on the crack surface, and the deeper the crack depth, the more the magnetic substance is adsorbed on the crack surface. Therefore, in the embodiment of the present application, a magnetic field is first applied around the surface of the crack of the metal material 6 to enable a magnetic fluorescent substance 7 to be concentrated on the surface of the crack, specifically, two electrodes of a magnetometer 11 are placed on both sides of the crack to generate a leakage magnetic field on the surface of the crack, and then the magnetic fluorescent substance 7 is placed on the surface of the crack and can be adsorbed on the surface of the crack when placed in the magnetic field.
The magnetic fluorescent substance 7 can emit visible fluorescence under the irradiation of ultraviolet rays, the more the magnetic fluorescent substance 7 is adsorbed on the surface of the crack, the stronger the intensity of the visible fluorescence is, and the intensity of the visible fluorescence can be measured, so that when the magnetic fluorescent substance 7 is placed on the surface of the crack, the adsorbed magnetic fluorescent substance 7 can emit visible fluorescence under the irradiation of ultraviolet rays. Specifically, the ultraviolet lamp 12 is used for irradiating the magnetic fluorescent substance 7 adsorbed on the surface of the crack, visible fluorescence is displayed on the surface of the crack, the intensity of the fluorescence emitted by the magnetic fluorescent substance 7 can be measured by the fluorescence intensity detection module 2 in the crack depth detector 8, after the intensity of the fluorescence is measured, the crack depth calculation module 3 in the crack depth detector 8 automatically converts the intensity of the fluorescence into the crack area according to the corresponding relation between the intensity of the fluorescence and the crack area, then the crack length is input into the crack depth detector 8 (the crack length can be actually measured on site), and the crack depth calculation module 3 calculates the ratio of the crack area to the crack length, namely the crack depth, and displays the crack depth in the display module 4.
The method for detecting the surface crack depth of the metal material, provided by the invention, can comprise the following steps, referring to fig. 3:
101. and detecting the intensity of visible fluorescence generated by the magnetic fluorescent substance on the surface of the crack, and determining the area of the crack according to the intensity of the visible fluorescence.
For this example, as an embodiment, the determining the crack area according to the intensity of the visible fluorescence comprises: and calculating the crack area corresponding to the intensity of the visible fluorescence by utilizing the functional relation between the intensity of the visible fluorescence and the crack area.
The intensity of the visible fluorescence was measured and converted into the crack area using the functional relationship between the intensity of the visible fluorescence and the crack area, which is shown in fig. 4.
102. And calculating the ratio of the crack area to the crack length to obtain the crack depth.
For the present embodiment, as an implementation manner, the crack is regarded as a planar defect in the detection industry as a very harmful defect, i.e. a two-dimensional defect. That is, when quantifying the damage of the crack, generally, the opening width of the crack is not considered, and only the measured parameters are length and depth, so that the crack area is the area of a two-dimensional plane, and after determining the crack area, the crack depth can be obtained by calculating the ratio of the crack area to the crack length. The method has the advantages of simple principle, simple and convenient operation, accurate measurement and strong practicability.
The application provides a detection device and a method for the surface crack depth of a metal material, wherein the detection device comprises: the device comprises a fluorescence generation module, a fluorescence intensity detection module and a crack depth calculation module; the fluorescence generation module is used for generating visible fluorescence on the surface of the crack; the fluorescence intensity detection module is connected with the fluorescence generation module and used for receiving the visible fluorescence and detecting the intensity of the visible fluorescence; the crack depth calculation module is connected with the fluorescence intensity detection module and used for converting the intensity of the visible fluorescence into the crack area and calculating the crack depth according to the crack area and the crack length. The crack is regarded as a defect with great harm and is regarded as a planar defect in the detection industry, namely a two-dimensional defect, when the harmfulness of the crack is quantified, the opening width of the crack is generally not considered, and only the measured parameters are length and depth, so the technical scheme in the application utilizes the principle that the deeper the crack depth is, the more the magnetic fluorescent substance is adsorbed on the surface of the crack, and the more the magnetic fluorescent substance is adsorbed, and the stronger the intensity of the visible fluorescence of the magnetic fluorescent substance is, measures the intensity of the visible fluorescence of the magnetic fluorescent substance adsorbed on the surface of the crack by utilizing the principle that the stronger the intensity of the visible fluorescence of the crack is, can directly convert the intensity of the visible fluorescence into the crack area according to the functional relation between the intensity of the visible fluorescence and the crack area, and the crack length can be measured only by utilizing tools such as a ruler and the like on site.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A device for detecting the crack depth on the surface of a metal material, which is characterized by comprising: the device comprises a fluorescence generation module, a fluorescence intensity detection module and a crack depth calculation module;
the fluorescence generation module is used for generating visible fluorescence on the surface of the crack;
the fluorescence intensity detection module is connected with the fluorescence generation module and used for receiving the visible fluorescence and detecting the intensity of the visible fluorescence;
the crack depth calculation module is connected with the fluorescence intensity detection module and used for converting the intensity of the visible fluorescence into a crack area and calculating the crack depth according to the crack area and the crack length.
2. The apparatus of claim 1, wherein the fluorescence generation module comprises: a magnetometer, an ultraviolet lamp;
two electrodes of the magnetometer are placed on two sides of the crack and used for generating a leakage magnetic field on the surface of the crack;
and placing a magnetic fluorescent substance on the surface of the crack, and irradiating the magnetic fluorescent substance adsorbed on the surface of the crack by the ultraviolet lamp to display visible fluorescence on the surface of the crack.
3. The apparatus of claim 1, wherein the detection apparatus further comprises: a display module;
and the display module is connected with the crack depth calculation module and is used for displaying the value of the crack depth.
4. The apparatus of claim 3, wherein the detection apparatus further comprises: a power supply module;
the power module is respectively connected with the fluorescence intensity detection module, the crack depth calculation module and the display module and is used for supplying power to the detection device.
5. A method for detecting the depth of a crack on the surface of a metal material, which is applied to the detection device of any one of claims 1 to 4, and comprises the following steps:
detecting the intensity of visible fluorescence generated by the magnetic fluorescent substance on the surface of the crack, and determining the area of the crack according to the intensity of the visible fluorescence;
and calculating the ratio of the crack area to the crack length to obtain the crack depth.
6. The method of claim 5, wherein determining the crack area from the intensity of the visible fluorescence comprises:
and calculating the crack area corresponding to the intensity of the visible fluorescence by utilizing the functional relation between the intensity of the visible fluorescence and the crack area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649830.1A CN115164760A (en) | 2022-06-10 | 2022-06-10 | Device and method for detecting surface crack depth of metal material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649830.1A CN115164760A (en) | 2022-06-10 | 2022-06-10 | Device and method for detecting surface crack depth of metal material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115164760A true CN115164760A (en) | 2022-10-11 |
Family
ID=83485662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210649830.1A Pending CN115164760A (en) | 2022-06-10 | 2022-06-10 | Device and method for detecting surface crack depth of metal material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115164760A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210969A (en) * | 1996-01-31 | 1997-08-15 | Nippon Steel Corp | Automatic magnetic particle inspection device |
| JP2002039954A (en) * | 2000-07-26 | 2002-02-06 | Mitsubishi Electric Corp | Fluorescent light emission flaw detector |
-
2022
- 2022-06-10 CN CN202210649830.1A patent/CN115164760A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210969A (en) * | 1996-01-31 | 1997-08-15 | Nippon Steel Corp | Automatic magnetic particle inspection device |
| JP2002039954A (en) * | 2000-07-26 | 2002-02-06 | Mitsubishi Electric Corp | Fluorescent light emission flaw detector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020119331A1 (en) | Voltage measurement method and apparatus | |
| CN102818523B (en) | Vision measurement method and measurement system of small workpiece | |
| Roncali et al. | Cerenkov light transport in scintillation crystals explained: realistic simulation with GATE | |
| CN102636488A (en) | Quantitative measurement method for sorbite content in high-carbon steel rod | |
| CN111023960A (en) | Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material | |
| CN109444180A (en) | NF series heat insulation material product detection method of X-ray | |
| CN203744926U (en) | Flatness detection equipment for currency detector foundation board | |
| CN104865221A (en) | Terahertz plasma wave organic matter detecting device and detecting method | |
| CN110146003A (en) | It is a kind of to utilize rare earth permanent-magnetic material measurement steel pipe wall thickness and mass defect method | |
| CN115164760A (en) | Device and method for detecting surface crack depth of metal material | |
| CN203298673U (en) | Pole dimension measurement tool | |
| CN205449002U (en) | Jar body internal defect size detection device | |
| CN102980546A (en) | Portable coating thickness measurement instrument | |
| CN211652625U (en) | X-ray coating thickness gauge | |
| CN105674922B (en) | A kind of tank interior flaw size detection method and device | |
| KR101242699B1 (en) | Method for measuring spreaded quantity of coating layer | |
| CN105823822A (en) | Magnetic suspension usability evaluation apparatus used for magnetic powder flaw-detection nondestructive testing and method thereof | |
| CN103015974B (en) | A kind of oil-base mud logging instrument measuring probe | |
| CN103383368A (en) | Method for dot-matrix thermal conduction temperature measurement detection of workpiece defect | |
| TWI642897B (en) | Method for the measurement of a measurement object by means of x-ray fluorescence | |
| CN206671215U (en) | The internal flaw on-line measuring device of glass substrate | |
| CN102207470B (en) | Standard substance for calibrating magnification of industrial computed tomography (CT) system | |
| CN204831111U (en) | Detection apparatus for object overlay coating thickness | |
| CN107835937B (en) | Method for determining lesion progressivity and system for determining lesion progressivity | |
| CN216979332U (en) | Three-dimensional line resolution test body of security check equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |