Abstract

This paper deals with the question of optical-transfer-function (OTF) measurement using different types of object structure. The transfer function at the time of measurement is generally defined as the ratio of amplitudes of the image intensity and the object intensity for a particular frequency. It is interesting to note that transfer functions thus obtained do not always tally with the normal OTF defined in terms of linear grating of infinite height. Two cases have been considered, namely, a rotationally symmetric (circular) grating and a linear grating with finite height. It is noted that in the case of the circular grating, the intensity transfer function obtained is exactly the same as the OTF obtained with the linear grating. However, in the case of a line grating with finite height, the intensity transfer function varies with the height of the grating, and, in the limiting case of a line grating, the difference is of the order of 11%. The modulation is enhanced at low frequencies and diminished at high frequencies.

© 1991 Optical Society of America

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