Identifying defective units in infinite periodic arrays of point sources

This paper focuses on identifying defective units in unbounded periodic arrays of point sources using boundary data.

The study is motivated by the noninvasive evaluation of large-scale periodic source systems.

Unlike classical inverse source problems in free space, the key challenge here lies in the disruption of periodicity caused by defective sources in the infinite array.

To address this, we employ the Floquet - Bloch transform to reformulate the original inverse source problem as a quasi-periodic inverse source problem.

We first establish uniqueness theorems for both the original and the quasi-periodic formulations.

Then, we develop a new numerical method for identifying defective sources.

This method combines a sampling indicator function with an algebraic technique to determine not only the number of defective sources, but also their locations and intensities.

Numerical experiments are presented to validate the effectiveness of the proposed method.