为了在大口径激光能量在线测量装置的设计过程中消除光斑不均匀性、强度随机性以及光束偏轴等造成的影响，提出了一种简易方法，利用普通漫射片透射取样，先将光束缩束尽量消除其各种空间信息，仅保留其强度信息，并保证取样点仅位于漫散射覆盖区域，消除透射分量及光束的偏振态的影响，同时保证取样点到漫射片之间距离远大于漫射片上光斑的尺寸，消除传感器接收角不足对测量结果的影响，激光能量采用光电积分方法获得。结果表明,根据上述方法设计的能量在线测量装置在整个激光接收面上各处的响应较一致，受到局部强度变化的影响较小，激光发散角或者光轴发生较小变化时对测量结果不会造成明显的影响。提出的上述措施在工程上可以消除各种因素对测量结果造成的影响，保证测量精度。

In order to eliminate effect of inhomogeneous light spot, light intensity randomness, beam off-axis in the process of online large-spot laser energy measurement，a simple method was introduced. The laser beam was collected with a common diffusive plate and its spot was decreased so that its spatial information was eliminated and only the intensity information was reserved. At the same time, the sampling spots were laid in the region diffusive light could reach so as to eliminate effect of transmission section and polarization state. Furthermore, the distance between sampling spots and the diffusive plate was much greater than beam size to eliminate the effect of insufficiency of the sensor receiving angle. Laser energy was obtained by a photoelectric integrator. Experiment results indicate that the response in the laser detection surface is coincident and partial intensity change and laser divergence have little effect on the measurement result. The above suggested method can eliminate effect of many factors and ensure the measurement accuracy.