面曝光快速成形激光液位检测系统的研究

摘要

为了精确地掌握和控制面曝光快速成形系统中的树脂液位,使其保持在工作面上,设计了激光液位检测系统；根据激光三角法测量原理,选用红光半导体激光器为光源,利用位置传感器(PSD)获取反射光斑位置变化的信号来检测液位高度.实验表明:在量程为6 mm时,误差仅为0.34％,可以精确地检测树脂液面.%In order to control accurately the resin liquid level of mask projection stereolithography system, the laser liquid level detection system is designed. According to the measuring principle of laser triangulation, the system chooses the red light semiconductor lasers as the light source and use Position Sensitive Detectors (PSD) to detect liquid level height with the changing signal of reflection flare's position. The experimental result indicates that in the range of 6 mm, deviation is just 0.34%, which can accurately detect resin liquid surface.