在三角法激光位移测量系统中,光功率的强度和稳定性对测量精度具有重要影响。首先通过实验研究了待测物面颜色和粗糙度对系统中光束衰减程度的影响,然后在MATLAB/Simulink中进行位移测量系统的光功率控制建模和分析。结果表明: 对不同颜色和粗糙度的待测物面, 在75μs之后系统光功率控制稳定度达到了0.1mW;待测物面对光束的衰减作用越小, 功率控制系统的超调量越大, 响应时间越快。这为精确控制激光器的发光强度和适应不同物面的精确位移测量打下了基础。

In the triangulation method laser displacement measuring system, the strength and stability of the optical power have a major impact on measurement accuracy. First, the experiment has been done to study the impact of the object surface color and roughness on beam attenuation. Then, the optical power control of the displacement measuring system in the MATLAB/Simulink is modeled and analyzed. The result shows that the stabilit of the optical power after 75 μs is 0.1mW for the different colors and roughness of object surface. And the smaller the beam attenuation, the overshoot of the power control system will be increased, but at the same time settling time will be reduced. This lays the foundation for precise control of the laser luminous intensity to adapt to the accurate measurement of the displacement of the object surface.