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。
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。
The microstructure and fracture process of an eutectoid pearlitic steel have been observation and analysed by means of electron-diffraction-contrast technique and SEM.
应用电子衍衬技术和扫描电镜等手段，对共析珠光体轨钢的微观结构和断裂过程，进行了观察和分析。
The good experimental results prove that the holographic gratings made with two-deposited film method can provide high contrast and good diffraction effect during the high temperature test.
高温实验结果表明。双镀层高温全息光栅具有较好的抗氧化能力，可作为高温变形测量的基本元件使用。
The good experimental results prove that the holographic gratings made with two-deposited film method can provide high contrast and good diffraction effect during the high temperature test.
高温实验结果表明。双镀层高温全息光栅具有较好的抗氧化能力，可作为高温变形测量的基本元件使用。
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