物面分波前反射镜位移调制参考光双曝光全息

Research in Double-Exposure Holography of Reference-Beam Modulated by Wavefront-Division-Mirror Displacement

研究物面分波前反射镜运动调制参考光双曝光全息测量物体位移方向的理论与方法。在两次曝光全息图的记录过程中,置于物面的分波前反射镜作微位移,则该反射镜反射的参考光被反射镜运动所调制,由此记录的双曝光全息干涉图不仅含有物体位移数值的信息,而且还含有位移方向的信息。通过理论分析,建立了当观察点移动时这类双曝光干涉图上干涉条纹的移动方向与物体位移方向及分波前反射镜位移方向之间的相互关系和基本规律,导出了相关公式,并确立了测量物体位移方向的方法,给出了实验结果。

The theory and the method of measuring displacement direction by double-exposure hologram,that the reference-beam is modulated by the displacement of the wavefront-division mirror,are investigated.In the process of recording double-exposure hologram,the mirror placed on the surface of the measured object is displaced when the object has a micro-displacement,and then the reference beam reflected by the mirror is modulated.The hologram can records the displacing information of the object not only in magnitude but also in direction.Through theoretical analysis,the correlation of the displacement directions between the interference pattern of the hologram and the wavefront-division mirror or the measured object is established when the object displaces,and the correlation formulas are derived.Measured method of displacement direction is described.Experimental result is given.