光固化快速成型高分辨激光液位检测系统的开发

为了精确控制光固化快速成型的树脂液位，开发了基于倾角测量原理的高分辨激光液位检测系统．系统中采用亮度可变的激光源，克服了除法器的运算误差，通过闭环控制回路，测量出正比于位置传感器（PSD）输出电流的端电压，由此可精确地反映出光束位置．采用交流调制激光分离背景光和暗电流，不仅提高了PSD的检测敏感度，而且有效地消除了杂散光和暗电流对检测精度的影响．经过检测系统的精度标定，高分辨激光液位检测系统在液位为1～7mm的变化范围内，分辨率可以达到1．5μm．

Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus

A set of inclination measurement-based high-resolution liquid-level laser detecting system is developed to detect the liquid-level of stereolithography apparatus,where a brightness-variable laser source is adopted to remove the computational error of divider,and a closed-loop circuit is set to measure the terminal voltage directly proportional to the output current of position sensitive device and hence the position of laser beam can be accurately indicated.An AC-modulated laser enables to separate backgrou...