CN105571549A - Nondestructive test method of heat wave imaging of cylindrical surface coating - Google Patents
Nondestructive test method of heat wave imaging of cylindrical surface coating Download PDFInfo
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- CN105571549A CN105571549A CN201510919257.1A CN201510919257A CN105571549A CN 105571549 A CN105571549 A CN 105571549A CN 201510919257 A CN201510919257 A CN 201510919257A CN 105571549 A CN105571549 A CN 105571549A
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- 238000000576 coating method Methods 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 title claims abstract description 17
- 238000003384 imaging method Methods 0.000 title claims abstract description 14
- 238000010998 test method Methods 0.000 title abstract 2
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims 2
- 230000000007 visual effect Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 15
- 239000000523 sample Substances 0.000 description 7
- 238000001931 thermography Methods 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000036962 time dependent Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
- G01B21/085—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness using thermal means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a nondestructive test method of heat wave imaging of a cylindrical surface coating. A system uses a high power linear laser beam to carry out heat excitation on the surface of a test piece. The test piece is arranged on a rotation bearing bench and is driven to carry out coaxial rotation at a constant speed by a scanning control unit. A thermal infrared imager continuously acquire heat wave images on the surface of the test after the heat excitation by laser, and corrects displacement of the test piece in the acquired images according to rotation speed of the test piece and the frame frequency of the thermal infrared imager so as to obtain change waves of heat wave signals along with time, thereby calculating information like thickness of the coating.
Description
Technical field
The present invention relates to a kind of coat thickness detection method based on thermal wave imagine technique, particularly detect for the coating at cylinder parts surface, belong to Infrared Non-destructive Testing technical field.
Background technology
Along with the fast development of science and technology, the application of coating and film is more and more extensive, particularly at aerospace field, because the condition of work of parts is often all exceedingly odious, as high temperature or corrosion environment, more therefore as thermal boundary or anticorrosion specific coatings seem very important.The detection of current industry member to the measurement of thicknesses of layers and coating adhesion quality is had higher requirement, except accuracy and reliability, also requirement can online, noncontact, to detect etc. in real time.The conventional method used in the detection of thicknesses of layers at present mainly comprises eddy current, ultrasonic, X ray, sonde method and optical method etc., but these methods can not meet the requirement of modern industry to film thickness measuring completely, as eddy-current method has particular requirement to backing material character, require conduction; Ultrasonic method needs to use couplant, has contact, and can not effectively measure thin rete; X ray requires that sample must be to carry out transmission detection, and the requirement having specific safety to protect; The detection of probe contact-type owned by France, requires step, may injure sample; And optical method requires that rete must be transparent medium, and there is very high smooth finish, etc.Due to current a lot of coating have that thickness is thin, nontransparent, rough surface, the characteristic such as fragile easily damaged, therefore need to adopt more advanced technological means to meet the detection of these retes.
Thermal wave imagine technique is the nondestructiving detecting means that RECENT DEVELOPMENTS is got up, its ultimate principle adopts thermal excitation source to carry out heating to produce thermal pulse to surface of test piece, this thermal pulse forms heat wave to test specimen internal communication, when heat wave runs into defect or the vicissitudinous local time of thermal impedance in test specimen inside, partial heat energy will occur to reflect and get back to the surface of test specimen, makes the distribution of the temperature formative dynamics of surface of test piece.Adopt the time dependent information of thermal infrared imager record surface of test piece temperature, then by image processing means, heat wave signal is corrected, processes and analyzed, realize the detection to thicknesses of layers.Compare traditional nondestructiving detecting means, thermal wave imagine technique has unique advantage, such as noncontact, large area fast imaging, applicable nontransparent coating etc., particularly make it be particularly suitable for the detection of thermal barrier coating to the characteristic of the thermal property sensitivity of material, modern industry, the particularly aircraft industry detection demand to specific coatings can be met.
Thermal wave imagine technique adopts thermal infrared imager to gather heat wave image, therefore requires that test specimen surface is relatively smooth, is beneficial to blur-free imaging.But the parts that in actual applications, very multipart out-of-shape, particularly aeromotor are correlated with are all much cydariform or cylindrical shape.Although can progressively rotary part be passed through, gather the method that is finally stitched together of multiple image, but so not only time-consuming bothersome, and still there is certain curved surface due to every width image, can there is the change of deformation and heat wave signal in image, therefore Detection results is desirable not to the utmost because of curved surface in local.
Summary of the invention
Object of the present invention is exactly the deficiency for current thermal wave imaging coupled columns face component surface coating detection technique, proposes a kind of pick-up unit of improvement.Concrete grammar is: adopt linear laser beam to carry out thermal excitation to surface of test piece, test specimen is then placed on a rotation plummer, this rotation plummer drives test specimen to be undertaken at the uniform velocity and coaxial rotating by scan control unit controls, the surface of test piece image of thermal infrared imager continuous acquisition after Infrared NDT system.Because test specimen ceaselessly rotates, in the thermal imaging system image gathered, in every frame, the position of test specimen is different, the movement of frame frequency to this position according to test specimen rotational speed and thermal imaging system corrects, and the heat wave signal that just can obtain this surface of test piece corresponds to not value in the same time.Draw this signal curve over time, just can calculate the information such as the thickness of coating.
Accompanying drawing explanation
Fig. 1 is thermal wave imaging principle schematic;
Fig. 2 is one embodiment of the present invention;
Fig. 3 is a kind of rotation plummer schematic diagram;
Fig. 4 is another embodiment of the present invention;
Fig. 5 is a kind of Cleaning Principle schematic diagram.
Embodiment
In order to make principle of the present invention and feature be better understood, below with reference to specific embodiment and accompanying drawing, the present invention is described further.
Shown in Fig. 1 is the ultimate principle of thermal wave imaging Non-Destructive Testing, short light pulse radiation 10 pairs of sample surfaces 11 carry out short-period heating, produce pulse heat wave 15 to propagate to sample interior, when running into the interface 14 of coating 12 and substrate 13, understand some reflection heat wave 17 and be reflected to sample surfaces, the time reflected, intensity etc. are relevant with the thickness of rete and the physical characteristics of bi-material.If interface 14 place be bonded with defect 16 time, stronger reflected signal will being produced, therefore just can learn the situation that interface bonds over time by analyzing sample surfaces 11 temperature.
Shown in Fig. 2 is a kind of thermal wave imaging device embodiments schematic diagram for test column finishing coat.Superpower laser 21 is wherein for the surface actuator heat wave at test specimen 24, and its laser beam 28 exported, through light-beam forming unit 22, makes to form wire hot spot 23 in surface of test piece.Test specimen 24 is placed in and rotates on plummer 26, and under the drive rotating plummer 26, test specimen 24 is around the axis uniform rotation of cylinder.Superpower laser 21 can be that continuous power exports, because cylinder test specimen is ceaselessly rotating, therefore in surface of test piece fixing a bit for, it is of short duration for being excited time of light beam 28 thermal excitation, thus achieves the object of pulse heat excitation.The heat wave image of collection for gathering the heat wave image on test specimen 24 surface, and is delivered to data processing unit 20 and is carried out Treatment Analysis by thermal infrared imager 25.Scan control unit 27 is mainly used in controlling to rotate the synchronized relation between plummer 26 and thermal infrared imager 25, to reach optimum testing result.Such as when the distance of the test specimen image movement between two continuous frames on thermal imaging system chip is just in time the integral multiple of thermal imaging system pixel column, at this moment the noise of signal is smaller.
A kind of structure of simple rotation plummer 26 as shown in Figure 3, it is made up of bearing support 31, rotation platform 32 and clamping head 33, bearing support 31 is for supporting whole rotation plummer, settle rotation platform 32 and clamping head 33 above respectively, supported by clamping head 33 and fix test specimen 24, make it do coaxial rotating with rotation platform 32, the motion of rotation platform 32 is subject to the driving of scan control unit 27.
Detection for cylinder test specimen inside surface can carry out simple realization by increasing a catoptron, as shown in Figure 4, by the refraction of catoptron 40, laser beam arrives the inside surface of cylinder test specimen, this catoptron 40 same can reflect infrared radiation, makes it arrive thermal imaging system 25.The wavelength of usual thermal excitation is below 1 micron, and detectable infrared radiation wavelength scope is usually at 3-22 micron, adopts gold-plated film just can realize the object reflected laser beam 28 and infrared signal simultaneously.
As shown in Fig. 5 (a), laser beam 23 be in a fixed position and test specimen at continuous rotation, the fixing position continuous moving a bit in the heat wave image of continuous acquisition of surface of test piece, as shown in Fig. 5 (b), the region that laser beam 23 heats will be in a, b, c tri-positions respectively in three two field pictures 30.When image procossing, will from each two field picture by the heat wave signal extraction of corresponding surface of test piece each point out, again its order to be lined up and with the heat waves formula corresponding to this coating to its in addition matching, as shown in Fig. 5 (c), thus obtain the various physical parameters of surface of test piece coating, as thickness and bonding quality etc.
In sum, a kind of thermal wave imaging method for test column finishing coat, comprises the following steps:
A. be placed in by test specimen 24 and rotate on plummer 26, this rotation plummer 26 drives test specimen 24 to do uniform rotation around cylinder central shaft;
B. linear laser beam 23 pairs of test specimen 24 surfaces are adopted to carry out thermal excitation;
C. the acquisition surface heat wave sequence image of thermal infrared imager 25 pairs of test specimens 24 is adopted;
D. correspond to each point on test specimen 24 surface, from every frame heat wave sequence image, extract corresponding heat wave signal, and line up in chronological order, obtain a time dependent curve of heat wave signal;
E. utilize theoretical model formula to this heat wave signal in time change curve carry out matching, obtain the coating physical features of test specimen 24, comprise thickness and bonding quality etc.
More than illustrate it is all using coating as describing object, but same operation and Cleaning Principle are applicable to detection and the flaw detection of cylinder test specimen inherent vice.This instructions adopts linear laser beam as thermal excitation source in describing simultaneously, also can adopt the laser beam of other shape, as point-like.
The above description of this invention is illustrative, and non-limiting, modifies within the scope of the appended claims, changes and equivalence, all will fall within protection scope of the present invention to it.
Claims (4)
1., for a thermal wave imaging device for test column finishing coat, it is characterized in that described device comprises:
Superpower laser (21), described superpower laser (21) is for test specimen (24) surface actuator heat wave;
Light-beam forming unit (22), described light-beam forming unit (22) makes laser beam form wire hot spot on test specimen (24) surface;
Thermal infrared imager (25), described thermal infrared imager (25) is for gathering the heat wave image on test specimen (24) surface;
Data processing unit (20), described data processing unit (20) carries out Treatment Analysis for the heat wave image gathered described thermal infrared imager (25);
Rotate plummer (26), described rotation plummer (26) is for driving described test specimen (24) around the uniform rotation of cylinder center;
Scan control unit (27), described scan control unit (27) is for controlling the synchronized relation between described rotation plummer (26) and described thermal infrared imager (25).
2. a kind of thermal wave imaging device for test column finishing coat according to claim 1, described rotation plummer (26) comprising:
Bearing support (31), described bearing support (31) is for supporting whole rotation plummer;
Rotation platform (32), described rotation platform (32) is placed on described bearing support (31), at the uniform velocity rotates for driving described test specimen (24);
Clamping head (33), described clamping head (33) is for supporting described test specimen (24) and carrying out coaxial rotating with described rotation platform (32).
3. a kind of thermal wave imaging device for test column finishing coat according to claim 1, comprise refluxing reflection mirror (40) further, described refluxing reflection mirror (40), for the visual field of turn back laser beam and described thermal infrared imager (25), is beneficial to the inner surface of test column interview part.
4., for a thermal wave imaging method for test column finishing coat, it is characterized in that described method comprises:
Be placed in by test specimen (24) and rotate on plummer (26), described rotation plummer (26) drives described test specimen (24) to do uniform rotation around cylinder center;
Linear laser beam (23) is adopted to carry out thermal excitation to described test specimen (24) surface;
Adopt thermal infrared imager (25) to described test specimen (24) acquisition surface heat wave sequence image;
Corresponding to each point on described test specimen (24) surface, from heat wave sequence image described in every frame, extract corresponding heat wave signal, and line up in chronological order, obtain the change curve that a heat wave signal becomes in time;
Utilize theoretical model formula to described heat wave signal in time change curve carry out matching, obtain the coating physical features of described test specimen (24).
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| CN201510919257.1A CN105571549A (en) | 2015-12-10 | 2015-12-10 | Nondestructive test method of heat wave imaging of cylindrical surface coating |
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| CN201510919257.1A CN105571549A (en) | 2015-12-10 | 2015-12-10 | Nondestructive test method of heat wave imaging of cylindrical surface coating |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508553A (en) * | 2016-06-14 | 2017-12-22 | 上海太阳能工程技术研究中心有限公司 | The lossless detection method of photovoltaic module |
| CN109211974A (en) * | 2018-08-07 | 2019-01-15 | 哈尔滨商业大学 | Thermal insulation layer construction debonding defect pulsed femtosecond laser pumping infrared thermal wave detection device and method |
| CN110073171A (en) * | 2017-11-24 | 2019-07-30 | 韩国科学技术院 | The method and its equipment of visualization measurement are executed to the thickness distribution of paint film |
| CN110186956A (en) * | 2019-05-17 | 2019-08-30 | 神华铁路货车运输有限责任公司 | Portable ultraphonic motivates thermal wave detection device |
| DE102018004878A1 (en) | 2018-06-19 | 2019-12-19 | Psa Automobiles Sa | Inspection device and method for quality inspection of a surface coating of a workpiece |
| CN110603438A (en) * | 2017-05-08 | 2019-12-20 | 西门子能源公司 | Laser thermal imaging method |
| CN113567492A (en) * | 2021-07-26 | 2021-10-29 | 北京航空航天大学 | Nondestructive testing method and device for thermal barrier coating of turbine blade based on infrared heat dissipation |
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| CN107508553A (en) * | 2016-06-14 | 2017-12-22 | 上海太阳能工程技术研究中心有限公司 | The lossless detection method of photovoltaic module |
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| CN110073171A (en) * | 2017-11-24 | 2019-07-30 | 韩国科学技术院 | The method and its equipment of visualization measurement are executed to the thickness distribution of paint film |
| DE102018004878A1 (en) | 2018-06-19 | 2019-12-19 | Psa Automobiles Sa | Inspection device and method for quality inspection of a surface coating of a workpiece |
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| CN109211974A (en) * | 2018-08-07 | 2019-01-15 | 哈尔滨商业大学 | Thermal insulation layer construction debonding defect pulsed femtosecond laser pumping infrared thermal wave detection device and method |
| CN110186956A (en) * | 2019-05-17 | 2019-08-30 | 神华铁路货车运输有限责任公司 | Portable ultraphonic motivates thermal wave detection device |
| CN113567492A (en) * | 2021-07-26 | 2021-10-29 | 北京航空航天大学 | Nondestructive testing method and device for thermal barrier coating of turbine blade based on infrared heat dissipation |
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