随着光束间距的增大，干涉条纹间距减小，条纹数目增多，条纹可见度减小；
With increasing beam separation, the number of interference fringes increases and the fringe separation and visibility decrease.
介绍了一种基于多光束原理的薄膜应力测试方法，通过对反射光光点间距变化的检测，可以实时得到应力的信息。
A new method based on multi - beam to measure the stress of optical thin film is introduced the stress can be obtained by measuring the relative distances between the reflected light spots.
光束束腰半径增大时，干涉条纹数目增多，条纹间距变化很小，对条纹可见度影响不大。
With increasing beam waists, the number of interference fringes increase, but the fringes separation and visibility change little.
应用推荐