Abstract

The transfer function of an optical system is obtained from a direct measurement of the wavefront. The measured wavefront data are utilized to calculate the transfer function by the convolution theorem. The wavefront measurements are done with a Twyman–Green interferometer and a modified form of the Foucault knife-edge test (termed a Foucault photometer test). It is shown that the results of the two independent measurements yield excellent agreement with each other as well as the theoretical calculations from the lens design data. Detailed analysis of the two systems is given.

© 1965 Optical Society of America

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