We made several types of screens which varied in the fundamental factors of screen structure, and we measured the wiener spectra of those screens with the various slit lengths of 400,600,1000 and 1500μm. Those fundamental factors contained the thickness of protective layer, the phosphor coating density per screen and the type of support.
We considered the relationships between the slit lengths and the wiener spectral values for low spatial frequencies. Our results indicated the increase ratio of the wiener spectral values vs the slit lengths was almost determined by the spatial frequencies, and that the dependence on the screen structures was very slight.
We therefore think that the slit aperture of about 1.0mm length is sufficiently available in the measurement of wiener spectra when we use the wiener spectral values relatively in order to compare the image qualities of various screen /film systems.
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