The precise measurement of surface roughness is an important ability in surface engineering applications. Non-destructive techniques like laser speckle characterization is one of the key analysis for the surface of the material. The speckles coming from different atomic and subatomic regions are recorded for different surfaces like rough, smooth and non smooth surfaces, using a laboratory designed laser sensor. The sensitivity of speckle signals measured at different distances from the surfaces are recorded. The strength of the signal and its variation with distances of the source from the surfaces provides significant information about surface conditions embedded in the present work. Furthermore, the speckle contrast changes significantly with the change of the beam strength of incidence laser signal with distance which provides clear illuminance of the texture of the material.

表面粗糙度的精确测量是表面工程应用中的一项重要功能。激光散斑表征等非破坏性技术是材料表面的关键分析之一。使用实验室设计的激光传感器记录不同表面（例如粗糙，光滑和不光滑表面）的来自不同原子和亚原子区域的斑点。记录在距表面不同距离处测得的斑点信号的灵敏度。信号的强度及其随源距表面距离的变化提供了有关当前工作中嵌入的表面状况的重要信息。此外，