基于空间滤波的工件在线检测方法

Method for workpieces on-line test based on spatial filtering

本文提出了一种利用空间滤波实现在线检测工件误差等级的方法。该方法将标准件与待测件对称放置于光学4f系统的输入面,频谱面上为精确移动了1/4个周期的正弦光栅,在输出平面的中心部位得到了两个物体相减的图像。用空间滤波器滤出我们感兴趣的两物体差异部分,用光电池探测其光强并经I-V转换、前置放大、限位与A/D转换后输入到单片机上进行自动分级与处理。最后模拟验证了其可行性。该方法具有快速、非接触、可在线测量的特点。

This paper introduced a method for workpieces error on-line test based on spatial filtering. In this method, we place both standard object and test workpiece on the input plane of optical processing system symmetrically and a sine grating which precisely shift 1/4 grating period on the spectrum plane, and we obtain the image of the subtraction of two objects on the output plane. Filter the interested parts using spatial filter, and detect the intensity of the interested part by photronic cell. After Ⅰ-Ⅴ conversion, preamplifier, clamping circuit and A/D convertor, import it to the Single-chip Microcomputer （SCM） to automatically grade and process. Finally, we validate its feasibility by simulation. This method has the characteristics of fast, non-contact and on-line measurement.