By using a reflector and two pentaprisms, one beam of light is separated into two parallel beams, then respectively they are received by two optical systems of the large scale photoelectric theodolite with certain imaging D-value which correspondingly rep
By using a reflector and two pentaprisms, one beam of light is separated into two parallel beams, then respectively they are received by two optical systems of the large scale photoelectric theodolite with certain imaging D-value which correspondingly rep
方法是利用一块反射镜和两块五棱镜将一束准直光束分光成两束平行光束，大型经纬仪的两个光学系统分别接收这两束平行光，两束平行光所成像的脱靶量差值即为两光学系统的光轴平行度。