基于激光位移传感器的可视化表面粗糙度测量系统

A Visual Measurement System of Surface Roughness Based on a Laser Displacement Sensor

表面粗糙度是表面微观几何形状误差,它是评价材料加工质量的一个重要参量。传统接触式测量表面粗糙度容易造成表面划伤,且测量速度低,不适合在线测量,而非接触式测量方法能够克服上述不足。本文设计了一种基于激光位移传感器的非接触式表面粗糙度测量系统,对设定区域扫描,实现对物体表面微观变化的在线检测,通过分析反射光强的变化,获得物体表面形貌变化及偏差信息。该系统采用MP340单片机进行数据处理,借助可视化人机交互界面实时监测被测物体表面状态结果。实验测试表明,系统原理直观,测试数据精确可靠,抗背景光干扰能力强,轴向检测范围在1~80µm的测量,精度小于5µm,为实际应用提供一种技术参考。

Surface roughness is the micro-geometry error of surface,which is an important parameter to evaluate the quality of material processing.The traditional contact measurement of surface roughness could give rise to surface scratches,and the measurement speed is low,so it is not suitable for on-line measurement,while non-contact measurement method can overcome the above shortcomings.In this paper,a non-contact surface roughness measurement system based on laser displacement sensor is designed.The microscopic changes of the object surface are detected on line by scanning the set area,and then by analyzing the changes of the reflected light intensity,the information of the surface morphology variation and deviation of objects is obtained.The system uses a single chip microcomputer(SCM)of MP340 for data processing,and uses a visual human-computer interactive interface to monitor the surface state of the measured objects in real time.Experimental tests show that the system is intuitive in principle,accurate and reliable in test data,strong in resistance to background light interference,and the measurement accuracy is less than 5µm in the axial detection range of 1~80µm.It provides a technical reference for practical application.