基于虚拟仪器的PCBA多通道视觉检测系统

The Multi-Channel Vision Inspection System Based on LabVIEW for PCBA

在检测误判率足够低的前提下,检测速度通常是制约视觉检测系统在线应用的关键因素.鉴于PCB图像具有大面积绿色阻焊膜且目标组件的位置相对固定的特点,本文提出了一种以区域分割思想为基础的多通道检测技术,用以提高PCBA视觉检测系统的检测速度.首先以单个组件的区域为基本单元,将PCB图像划分为多个独立小区域;然后将系统设置成多个同步检测的通道,并将分割好的小区域图像按照预先设定的顺序分别同时送入不同的通道内进行同步检测;最后基于虚拟仪器开发平台L abV IEW及其视觉开发工具IM AQ V is ion开发出了PCBA 10通道视觉检测系统.通过实验证实,折算之后,10通道系统的单片元件最大检测时间是12.5 m s,内存消耗量是205.0 KB;100通道系统的单片元件最大检测时间是1.25 m s,内存消耗量是2 050 KB.

Under the premise of the sufficiently low misjudgment ratio, inspecting speed is the key factor for the application of vision inspection system. In view of the PCB image characterized with large areas of solder mask and relatively fixed position of target component, a multi-channel inspection technology based on region segmentation was presented to improve the inspection speed. Firstly, one single component area was taken as a basic unit and the PCB image was divided into small independent areas. Then, the system was set up for multi-channel mode and the images of independent areas were sent to different channel at the same time for synchronous detection. Finally, based on the LabVIEW and IMAQ Vision, a ten-channel PCBA vision inspection system has been developed,which is validated for real PCBA and resulted that： For the 10-channel system, the max inspection time for one component and the required memory are 12.5 ms and 205.0 K bits, respectively. But for the 100-channel system, these two values are 1.25 ms and 2050 K bits.