Determination of the dihedral angle errors of a corner cube from Twyman-Green interferogram its

Several authors have used the dot patterns produced by the reflection of a pencil of light from imperfect corner cubes to quantify their imperfections. Yoder developed relationships that gave the deviation angles of the emerging beams with respect to the illuminating beam as a function of the three dihedral angle errors for the cube. He was able to favorably compare his calculated deviation angle values to the figures obtained directly from the dot patterns, but had to rely on independent measurements of the dihedral errors for the input values of his calculations. Joseph and Donahue used the pattern data to compute the relative sign and magnitude of all three dihedral angle errors.