Figure 3
Flexing of bipods accommodates differential expansion of the metrology frame relative to the baseplate. (Left) Resultant 3D finite element analysis distortion of metrology frame caused by a 1°C temperature differential. (Right) Metrology frame deformation along the central tangential line of the metrology frame shows a 6.5 nm sagitta change for a 1°C temperature differential. Circles represent ZPS sensor locations. |