A novel method is proposed to solve inhomogeneous light distribution existing in DLP projector by inserting a calibration mask into the upper-computer software.An automatic data acquisition equipment with UV light sensor,Arduino and stepping motors is invented,where the designed strategy is able to improve UV sensor precision to ± 10-5 W/cm2.This system directly collects calibration mask gray data according to the feedback of light sensor,establishes mathematical model of the mask,and draws it with Qt setPixel function,which significantly improves work efficiency.The calibration results of this system are verified by measurement and experiment.DLP projector light intensity range is diminished from 5 × 10-4 W/cm2 to 5 × 10-5 W/cm2.For the photosensitive resin,the negative impact of inhomogeneous light intensity can be reduced at the forming accuracy of 0.1 mm.%针对面曝光3D打印设备投影仪光强分布不匀的问题,提出了一套完整的修正方案,通过在上位机软件中添加灰度掩膜的方式实施光强补偿.利用紫外光传感器、Arduino控制板、步进电机等搭建自动化数据采集设备;设计算法剔除测量误差,提升传感器测量精度至±10-5 W/cm2.本系统可根据传感器反馈逼近直接获取离散的补偿掩膜灰度数据,建立灰度分布数学模型并利用QtsetPixel函数完成掩膜绘制,在简化计算、提高校准效率方面效果显著.经仪器检测及实际打印验证,提出的投影仪光强检测及补偿方案能够有效消除数字投影仪光强分布误差,将所测投影仪光强极差由5×10-4W/cm2缩小至5×10-5 W/cm2以下.对于文中选用的树脂材料,可在0.1 mm成形精度等级降低投影仪光强不匀造成的负面影响.
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