Reconstruction of polytopes from the modulus of the Fourier transform with small wave length

Abstract

Let $\mathcal{P}$ be an $n$-dimensional convex polytope and $\mathcal{S}$ be a hypersurface in ${\mathbb{R}}^n$. This paper investigates potentials to reconstruct $\mathcal{P}$ or at least to compute significant properties of $\mathcal{P}$ if the modulus of the Fourier transform of $\mathcal{P}$ on $\mathcal{S}$ with wave length $\lambda$, i.e., $|{\int }_{\mathcal{P}}{e}^{-i\frac{1}{\lambda }\mathbf{s}\cdot \mathbf{x}}\mathbf{dx}|$ for $\mathbf{s}\in \mathcal{S}$, is given, $\lambda$ is sufficiently small and $\mathcal{P}$ and $\mathcal{S}$ have some well-defined properties. The main tool is an asymptotic formula for the Fourier transform of $\mathcal{P}$ with wave length $\lambda$ when $\lambda \to 0$. The theory of X-ray scattering of nanoparticles motivates this study since the modulus of the Fourier transform of the reflected beam wave vectors are approximately measurable in experiments.