By Amidror Isaac
This e-book offers for the 1st time the idea of the moiré phenomenon among aperiodic or random layers. it's a complementary, but stand-alone significant other to the unique quantity via an analogous writer, which was once devoted to the moiré results that happen among periodic or repetitive layers. like the first quantity, this e-book offers a whole basic objective and application-independent exposition of the topic. It leads the reader throughout the quite a few phenomena which happen within the superposition of correlated aperiodic layers, either within the picture and within the spectral domain names. in the course of the entire textual content the publication favours a pictorial, intuitive process that is supported by way of arithmetic, and the dialogue is observed by way of loads of figures and illustrative examples, a few of that are visually beautiful or even spectacular.
The prerequisite mathematical history is restricted to an straight forward familiarity with calculus and with the Fourier thought.
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Extra resources for Aperiodic layers
1 uses the term “Glass patterns”, it is in fact completely general, and it covers both periodic and aperiodic cases. As we will see later, periodic cases are, indeed, particular cases of a general layer superposition, and in spite of their apparently different look, they still satisfy the same fundamental rules as any other layers. But because of their additional internal structure, periodic cases also satisfy several additional specific rules (that are expressed in terms of periods or frequencies, as described by the classical periodic moiré theory), rules that are not valid for general aperiodic cases.
10) in Appendix F). 2-9. The Fourier spectrum of a fully periodic structure such as a periodic dot screen or a periodic line grating is purely impulsive (see, for example, Fig. 10(f), or Fig. 12 in Vol. I). Suppose now that we slightly perturb the periodicity by adding some random noise to the locations of the periodic elements (this operation is often called “jittering”). How would this influence the spectrum of the structure? What would you expect to see in the spectrum when you gradually increase this random noise?
It should be noted that there exist also intermediate cases between pure periodic and pure aperiodic cases, for example: randomly perturbed periodic layers, where a certain percent of random behaviour is being added to an originally periodic structure. As one would expect, the Fourier spectrum of such layers is intermediate between the spectra of periodic and aperiodic cases: it consists of slightly blurred impulses corresponding to the frequencies in question plus a diffuse background that is typical to random cases.