In measurements which are influenced by external parameters, computer control and automation can help to improve the accuracy. This is also true of basically optical measurement set-ups such as certain interferometers for measuring flatness or wavefront aberrations, or set-ups for measuring the optical transfer function of lenses, for example. For the latter, a critical external parameter is the temperature variation resulting in expansion and therefore defocusing effects. New developments and measurement principles leading to improved accuracy are discussed.
Michael Schulz, Michael Schulz,
"Computer-controlled high-accuracy optical measurement", Proc. SPIE 2248, Optical Measurements and Sensors for the Process Industries, (15 November 1994); doi: 10.1117/12.194341; https://doi.org/10.1117/12.194341