Acta Optica Sinica, Volume. 6, Issue 2, 122(1986)
Double filtering for mapping phase objects
A new method, double filtering with two filter masks, is proposed to perform the Fourier-transform quasi-interferometry. In this way, some complex filter functions can be synthesized in a Moire equivalence from two comparatively simple filter functions. Furthermore, the resultant filter function can be contiuously changed by moving the masks along the optical axis, thus giving remarkable flexibility in practical applications.
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LIU LIREN. Double filtering for mapping phase objects[J]. Acta Optica Sinica, 1986, 6(2): 122