Tang Xiaoping. The Measurement of the OTF and SQF of the Photographic Lenses[J]. Editorial Office of Optics and Precision Engineering, 1990,(1): 13-16DOI:
We measured the OTF of a photographic lens by digital Fourier Transform
using a CCD to scan the slit image in the focal plane of the collimator in front of the measured lens.The Fourier Transform of the sampled data of the image
after input into the computer through a A/D converter
gave the OTF value. We measured the SQF of the lens using CCD to sample the logarithmic grating image fozmed by the measured lens and obta-ined the SQF from the integration of the system OTF expressed in polar coordinate and logrithmic frequency coordinate.