基于CPLD的曝光可控弧焊图像传感器

Visual image sensor for arc welding with controllable exposure based on CPLD

为了解决普通工业CCD摄像机固定的曝光时序与焊接过程中变化的电弧状态之间的同步问题,研制了一种基于复杂可编程逻辑器件CPLD(complex programmable logic device)的曝光可控弧焊图像传感器。该传感器由CCD摄像机、光学系统、机械快门和曝光控制器组成,其中曝光控制器包括焊接电弧状态检测、曝光参数预置、CPLD逻辑控制等模块。采用超高速集成电路硬件描述语言VHDL(very-high-speed circuit hardware de-scription language)描述不同弧焊工艺的曝光同步控制时序逻辑,并利用CPLD编程实现。结果表明,该传感器能有效避免弧光、飞溅等干扰,获取清晰一致的CO2短路过渡焊接和脉冲GTAW焊接熔池区域图像。

To solve the synchronizing problem between the fixed exposure schedule of the ordinary industrial CCD camera and the various state of welding arc during welding processes,a visual image sensor with controllable exposure was developed based on CPLD(complex programmable logic device) for arc welding.The novel sensor is composed of an ordinary industrial CCD camera,optical system,mechanical iris and an exposure controller.The exposure controller consists of the modules of detection of welding arc state detecting,exposure parameters presetting,logic control with CPLD and so on.The exposure schedule logics of different arc welding processes were described with very-high-speed integrated circuit hardware description language(VHDL) and programmed with a CPLD.Both CO2 short circuiting transfer arc welding and pulsed gas tungsten arc welding were carried out,and the experimental results show that clear and consistent molten pool images can be acquired,and the disturbances of arc light and spatter are avoided.