从图 a)中可以看到两束半环形光束在探测面的y轴方向产生了近1mm的位移差，严重影响了环形光的合束效果，这是因为当棱镜组的一侧棱镜沿着光束传输方向产生一定倾角，光束传输至该反射面后，半环形光束的传输角度不再与另一侧平行，传输至合束棱镜组表面就会产生一定的位移差。从图b)可以看到倾角侧产生的半环形光束能量向y轴下侧集中，而另一侧环形光束能量分布相对均匀。

From Fig. 8 a), it can be seen that the two semi-annular beams produce a displacement difference of nearly 1 mm in the y-axis direction of the detection surface, which seriously affects the combined effect of the annular light. This is because when the prisms on one side of the prism set produce a certain inclination along the beam transmission direction, after the beam is transmitted to this reflective surface, the transmission angle of the semi-annular beam is no longer parallel to the other side, and the transmission to the surface of the combined prism set will produce a certain displacement difference . From Fig. 8b), it can be seen that the energy of the half-ring beam produced on the inclined side is concentrated on the lower side of the y-axis, while the energy of the ring beam on the other side is relatively uniformly distributed.