介绍了实时全息术检测透明物的一种新方法，它采用物光再现的参考光和参考光通过全息图的直透光所形成的干涉图纹检测透明物体的变化。证明了这组干涉图纹与用参考光再现的物光和物光通过全息图的直透光所形成的干涉图纹分布规律相似，仅在相位上相差π。还讨论了这组干涉图纹的衬比和获得最佳衬比的条件。此方法可消除物光光路上某些因素带来的相位畸变,避开待测物体自发光的干扰,并可在全息图后方任意位置进行记录，这使实时全息术在实践中更具有灵活性，有助于它在更广阔领域内的应用。

A real time holographic testing method of transparent objects by using the interference pattern formed by the reconstruction of the reference wave and the original reference wave is introduced. The above interference fringe pattern is proved to be similar to the pattern which is formed by the reconstruction of the initial object wave and the wave scattered by the object during observation. The principle of this method and the characteristic function of the contrast of the interference pattern are presented. The phase distortion caused by any optical element in object optical path can be eliminated and the unexpected light emitted by the under testing object itself can be also avoided by using this method.