In this paper, the digital image correlation method for the analysis of 3-D displacement field is firstly presented. The 3-D displacement field caused by internal microstructures evolution is obtained by correlative calculation of digital images taken before and after deformation of the object. The 3-D searching window, correlation function and the fitted function of correlation coefficient are obtained. The numerical simulation results confirmed this technique. The precision of displacement measuvement is 0.02 pixel.

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The technique of diffraction enhanced imaging computed tomography is studied in this paper and a new algorithm is given. The absorption, scattering and refractive index gradient can be obtained using the new algorithm with projection data of an object in the rotation range of 0°—360° and only needs to set the analyzer at one point of the rocking curve. The experimental process of the new algorithm is much simpler than the conventional.

Based on the unique advantages of synchrotron radiation X-ray with high resolution and collimation，and the advantage of nondestructive observation of computed-tomography technique，synchrotron radiation computed tomography technique is widely used in many fields. In this paper，the errors caused by light source such as unevenness，supersaturation and super penetration are studied for synchrotron radiation computed tomography technique，and its three basic error forms are given. Numerical simulation results confirm this analysis.