抄録
In this paper, the thermal distortion of an aluminum alloy LY12 and 45# mild carbon steel are real-time observed and the thermal expansion coefficients (TECs) are measured by using Electronic Speckle Pattern Interferemetry (ESPI). Particularly, the speckle images in different temperature spots are analyzed by a batch-process code based on the digital speckle correlation method (DSCM) to determine the central-lines of the interference fringes automatically instead of the manual recognition. Meanwhile, the contributions of the temperature and the heating rate to the TECs are also investigated experimentally. Experimental results obtained in this paper show that the TECs of LY12 and 45# steel increase in a small scale with the temperature rising, but are independent on the temperature-rising rate.
