A modified fractal zone plate (FZP) with the character of extending the focal depth is proposed.
提出了一种具有增大焦深特性的改进型分形波带片(fzp)。
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The results indicate that flat-top beam shaping and single-circle beam shaping at the focal plane can all be realized by using three-zone annular phase pupil filters.
We built a seismotectonic model for the west part of this zone from data of geological profiles, deep crust seismic detection and earthquake focal mechanisms in this paper.