针对数字全息对离轴角度的要求，设计了可以精密监控离轴角度的数字全息实验装置. 通过引入反射镜、分束器和监控CCD 光学器件，借助频谱分析方法计算离轴角度，实时监控数字全息记录时参考光和物光之间的夹角. 该装置不仅可以在不重新调整光路的情况下实现同轴数字全息与离轴全息的自由切换，还可以使数字全息再现时原物像、零级项、共轭像刚好分离，降低数字全息记录对CCD 分辨率的要求，又可以有效利用再现视场. 使用分辨率板进行了验证实验，验证了该装置和 方法的可行性和有效性.

Digital holography experiment with the off-axis angle supervised accurately is designed to satisfy the requirement of off-axis angle. After introducing one reflector，two beam splitters，supervisin g CCD and calculating the off-axis angle by spatial spectrum analysis，the angle between the reference and the objective beams is supervised online. This setup can not only realize the alternation between the in-axis state and off-axis state without rearrangement，but also can separate the original objective image from the direct term and the twin image when the recorded digital holography is used for reconstruction. It can decrease the demanding of digital holography recording on CCD and make the reconstructing view field used effectively. Resolution target is used as the objects in the experiments carried out. The feasibility and effectiveness of this off-axis angle supervising setup are verified by optical experiments.