摘要
设计并实现了一种基于探测器阵列组件的光斑辅助定位系统。该系统以120元Si-PIN探测器作为光电传感器,将其排列为正方形,由120路光电转换电路将每个光电传感器采集到的电流信号转换为电压信号并与预先设置的阈值电平进行比较,以判断该点探测器是否探测到光信号,在CPLD时序控制下将每个探测器的响应情况通过数据采集电路实时传送至上位机。将探测器阵列组件放置在指定位置,通过调节光源位置直至上位机反映的图像为对准后的形式,由此实现光斑辅助定位。经测试表明,该系统能实现240mm×240mm大面积、精度2mm的光斑位置实时探测和辅助定位,且相对传统方式更加简单可行。
A 120 unit Si-PIN photo-detector array used as the photoelectric sensor was arranged as a square, the current signal collected by each photoelectric sensor was conversed to voltage signal by the photoelectric conversion circuit. Then the voltage signal was compared with the preset threshold voltage, and the result was transmitted to the computer on the control of the data-collection circuit and the schedule by CPLD. When the photo-detector array subassembly is placed in the destination location, the laser spot assistant orientation could be realized by adjusting the laser spot. According the test result, this subassembly can realize the real time detection and assistant orientation of the 240 mm× 240 mrn laser spot location, the precision can reach 2 mm, and it is more reliable and practical than tradition methods.
出处
《半导体光电》
CAS
CSCD
北大核心
2012年第4期600-602,共3页
Semiconductor Optoelectronics
关键词
光电探测器阵列
USB接口
光斑辅助定位
photo-detector array
USB interface
laser spot assistant orientation
