Using the Lambert character of the diffuser, according to the definition of BRDF, through the reflect signal measurement, the power/energy of the laser incident on the diffuser can be achieved.

• 该方法利用漫射板良好的朗伯特性，根据双向反射分布函数定义，通过反射信号的测量，准确得到入射在漫射板上激光束的功率-能量。