目前四轮定位仪采用的主要有PSD和CCD及CMOS 3种成像及数据处理技术,PSD输出的类比电流无法直接处理,需要先进行A/D转化,此转化过程可能受温度及湿度影响,形成误差,很难达到测量的精度要求。CMOS和CCD结构的最大不同点是像素的充电与储存设计结构不同。 At present, the four-wheel positioner uses three kinds of imaging and data processing technologies of PSD, CCD and CMOS. The analog current output by the PSD can not be directly processed and needs to be A / D converted first. This conversion process may be affected by temperature and humidity to form Error, it is difficult to achieve the accuracy of measurement requirements. CMOS and CCD structure of the biggest difference is that the pixel charging and storage design of different structures.