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Device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation

A pulsed laser, layered technology, applied in measurement devices, material defect testing, instruments, etc., can solve the problems of high power density, easily damaged material surface, unsuitable for thermal excitation source of infrared thermal wave nondestructive testing technology, etc., and achieve precise positioning. The effect of shooting, low price, easy operation and high safety

Pending Publication Date: 2019-04-12
SICHUAN UNIV
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AI Technical Summary

Problems solved by technology

The power of semiconductor laser can reach very high, but the output of semiconductor laser is generally a point light source, the power density is very high, and it is easy to damage the surface of the material, so it is not suitable to be directly used as a thermal excitation source for infrared thermal wave nondestructive testing technology
[0006] In summary, there are many problems in the existing non-destructive testing technology of thermal barrier coatings, and the detection speed cannot be improved very well. It is urgent for scientific and technological workers to research and develop a non-destructive testing of thermal barrier coatings with higher intelligence and more convenient operation. , the safety is guaranteed, the detection speed is faster, and the price is cheaper

Method used

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  • Device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation
  • Device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation

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Embodiment Construction

[0021] Such as figure 1 As shown, the area array pulsed laser 4 is a semiconductor-pumped solid-state laser with a maximum power of 100W, a spot diameter of 5mm, a pulse width of 1ms~5s, and a wavelength of 1064nm. The horizontal distance between two adjacent laser light sources of the area array photoelectric sensor is 20mm~25mm, the vertical distance is 20mm~25mm. Infrared thermal imager 7 is an uncooled thermal imager, which can be used immediately when it is turned on, and does not need to be cooled by a refrigerator. The image size is not less than 160×120 pixels, and the response band is 8 mu m~14 mu m, the acquisition frame frequency is 50Hz, the thermal sensitivity is 50mK, the acquisition time is 10s, and the scanning time of area array pulsed laser 4 is 6s. The diameter of the screw rod 3 is 8mm, the lead is 1mm, the precision can generally reach 0.1mm, and the speed is controlled between 2m / s~10m / s. The movement of the longitudinal slide rail 8 and the transvers...

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Abstract

The invention discloses a device and method for detecting thermal barrier coating (TBC) surfaces based on area array pulse laser excitation. The device comprises area array pulse laser, a thermal infrared imager, an industrial control computer, a lead screw, a sliding rail, a plate clamping device, an infrared thermal imager clamping device, a human-computer interaction interface, a thermal-dissipating air box and a switch. The method adopts the low-power area array pulse laser to conduct thermal excitation on a to-be-detected coating part, a small-size coating part serves as an object, temperature information of the to-be-detected coating part is collected through the thermal infrared imager, the surface temperature change function is fitted in the computer, then the coating thickness anddefect situations are calculated, meanwhile, the human-computer interaction interface is utilized to control the lead screw and the sliding rail to realize free moving and precise positioning of thethermal infrared imager in the three-dimensional direction, and non-destructive detection precision is greatly improved. The device and method adopt area array pulse laser excitation, short-cycle pulse heating is formed on the surface of the TBC surfaces, and detecting is conducted in the mode of not damaging the material surface, and meanwhile, the device and method have the advantages that non-contact performance is achieved, the scanning speed is high, the efficiency is high, the beam radiation angle is small, adjusting of liftoff is more accurate, positioning shooting of the thermal infrared imager is more accurate, operation is more convenient and quick, the safety is higher, and the price is low.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal wave non-destructive testing, and in particular relates to a device and method for detecting a thermal barrier coating surface based on an area array pulsed laser excitation. Background technique [0002] Thermal Barrier Coating (TBCs for short) is one of the most advanced high-temperature protective coatings at present. It has good heat insulation effect and oxidation resistance, and is widely used in gas turbine hot passage parts such as turbine blades and combustion chambers. Waiting for surface protection. Thermal barrier coatings generally have a double-layer structure, consisting of a surface ceramic layer and an inner metal bonding layer. The thickness is a key technical indicator characterizing the quality of thermal barrier coatings, which is related to the service life, bonding strength, and Evaluation and calculation of uniform internal stress and manufacturing cost, etc. The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/72G01B21/08
CPCG01B21/085G01N25/72
Inventor 伍剑波邱巧黄晓明
Owner SICHUAN UNIV
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