Determination of phase and modulation transfer function (PTF and MTF) of a printer by the convolution of transmission function measurement

In this paper, it is shown theoretically and verified experimentally that the modulation transfer function (MTF) and phase transfer function (PTF) of a printer can be evaluated simultaneously by measuring convolution of transmission function of a couple of printed Ronchi gratings. In practice, two similar printed Ronchi gratings are superimposed inversely to create the Moire fringes. By measuring the transmittance of moire fringes, the convolution function can be obtained. Using the latter function, the PTF can be evaluated in addition to MTF, but the measurement of the autocorrelation function of the gratings results in the MTF only. In fact, as superiority this technique does not require a high sensitive detector and a very narrow slit.