Available Transmission Spheres
So-called Transmission Spheres objectives are used for testing spherical surfaces. These generate a reference wave against which spherical specimens can be tested interferometrically. The Transmission Spheres objectives are available with different radii (R(Transmission Spheres)) and usable diameters (D(Transmission Spheres)). In order to measure the entire spherical surface to be tested, the following condition must be met:
R/D(Transmission Spheres) ≤ R/D(test area).
The following graphs and tables can be used to select the objective for the respective inspection task.