夹层全息方法的主要特点是在干涉计量中能够发现和校正被检测物体不必要的移动和转动;能判别位移的正负方向。这些优点具有较大的实用意义,所用装置也是普通设备。本文从原理上阐述了夹层方法的实质。对记录过程、所用设备以及补偿校正,方向判别等方法都作了明确论述,最后附一实例说明。 The main feature of mezzanine holography method is that it can detect and correct the unwanted movement and rotation of the detected object in the interferometry; can judge the positive and negative direction of the displacement. These advantages have greater practical significance, the device used is ordinary equipment. This paper elaborates the essence of the sandwich method from the principle. The recording process, the equipment used, as well as compensation and correction, the direction of discrimination and other methods have made a clear discussion, the last attached an example.