A new theoretical analysis of the contrast reversal images for the zeroth and other diffraction order encoded by a rectangular grating is given.
本文对矩形光栅编码图片的衍射零级与其它各级单独所成的象，其衬度能够反转的现象，提出了新的理论分析。
2
In order to improve the contrast of reconstruction images for the materials which their elements absorbance index are very close, the technique of diffraction enhanced SR-CT is developed.
针对吸收系数相近的多组分材料，吸收成像无法分辨的情形，提出了衍射增强SR - CT方法。
3
The microstructure and fracture process of an eutectoid pearlitic steel have been observation and analysed by means of electron-diffraction-contrast technique and SEM.