  In the medical fields, ultrasound detection is often performed with
piezoelectric arrays that enable one to simultaneously map the acoustic fields
at several positions. In this work, we develop a novel method for transforming
a single-element ultrasound detector into an effective detection array by
spatially filtering the incoming acoustic fields using a binary acoustic mask
coded with cyclic Hadamard patterns. By scanning the mask in front of the
detector, we obtain a multiplexed measurement dataset from which a map of the
acoustic field is analytically constructed. We experimentally demonstrate our
method by transforming a single-element ultrasound detector into 1D arrays with
up to 59 elements.
