全息干涉术提供了定量计算流场密度分布的可能性。为了能获得一张定量分析的有限条纹干涉图,必须要能控制流场未扰动区背景条纹的方位和间距,过去文献报道得比较多的是采用双全息图技术,以及在两次曝光中加楔的方法。我们曾经用改变参考光束方位的方法做到了这一点。本文将介绍一种新的光学方法 Holographic interferometry offers the possibility of quantitatively calculating the distribution of the flow field density. In order to obtain a quantitative finite interference fringe pattern, it is necessary to control the azimuth and spacing of the background fringes in the undisturbed region of the flow field. In the past, more information was reported using the double hologram technique and the double exposure Wedge method. We used to do this by changing the orientation of the reference beam. This article will introduce a new optical method