Influence of camera temperature on MTF measurements with finite image distance

Line Spread Function (LSF) based Modulation Transfer Function (MTF) measurements with finite image distance are sensitive to displacement errors in axial direction. Axial displacements between the sample and camera detector cause defocusing and thus, a MTF error proportional to the axial gradient of the sample’s MTF. This article demonstrates the influence of the camera temperature on the focus position in the MTF reference setup at PTB