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2 February 2009 Infrared testing for engine blades crack defects with laser scanning automatic heat loading
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In this paper, automatic scanning infrared laser nondestructive testing methods, such as aero-engine blades crack detection of defects; Use of thermal heating differential equations and leaves the surface temperature distribution in the infrared detection system to allow resolution under discussion laser scanning heating infrared detection engine blades crack defects. The method can be nondestructive testing of metal parts of the internal defects, such as micro-cracks, loose, porosity and so on, like the thin parts more effective. First introduced in the infrared detection system works as using laser scans of the work piece to be seized automatic heating pretreatment, to detect internal defects part of the nature and characteristics of purpose. The paper also build a two-dimensional analysis model of detected objects because of defective parts and non-defective parts of the geometry and physical properties of heat there is an obvious difference in surface temperature caused by the different response, therefore, can discuss affect of the temperature distribution of information, to determine the appropriate method. Discuss and analysis interaction between the loading heat flux density, length and depth of defects, and do some heat transfer analysis to measured the surface temperature distribution. Through load a constant heat flow to blades, the infrared detection system can obtain the surface temperature field of existence the temperature difference, which blades cracks determine the existence and its location.
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Fengming Bai V.D.M., Nuan Song, and Lixiao Wang "Infrared testing for engine blades crack defects with laser scanning automatic heat loading", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71601V (2 February 2009);

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