  This paper demonstrates a method of interpreting the mechanism of aberration
of optical systems based on non-Fourier transform optical transfer function
(OTF). According to the parameters of object plane cosine fringe, we obtain the
position on the pupil plane of the two beams of the interference pair emitted
by the cosine fringes. By combining the aberrations of the lens, the phase of
the cosine fringe of each interference pair in the image plane can be obtained.
Then the intensity of the cosine fringe formed by all the interference pattern
is superimposed to obtain the brightness distribution of the cosine fringe on
the image plane. After that, the OTF of the aberration system can be obtained
on the basis of the cosine fringe modulation on the image plane and the phase
shift. Finally, taking the non-Fourier transform OTF theory with wave analyze
the complex optical system, providing help for the optical system design and
imaging quality evaluation.
