Acoustic Shadow Moir\'e Interference: Experimental Proof

TL;DR

This paper experimentally demonstrates that ultrasound waves can produce shadow moiré images, extending optical moiré techniques to ultrasound for potential applications in medical imaging and material analysis.

Contribution

It provides the first experimental proof that ultrasound can generate shadow moiré images, opening new avenues for ultrasound-based surface and material characterization.

Findings

Ultrasound can produce shadow moiré fringes.

Moiré techniques can be applied to ultrasound imaging.

Experimental validation with Talbot images at 0.43 mm wavelength.

Abstract

Shadow moir\'e techniques are developed for optical waves to image 3D objects to determine their surface topology. In this paper we prove experimentally that also ultrasound can be used to create moir\'e images. Using moir\'e techniques will enhance ultrasound applications, such as medical imaging and material characterization. In our experiment, we used a grating mask made of aluminum, an ultrasound source in the megahertz range, and an acousto-optic detector to create and capture Talbot images for the grating. Talbot images are captured using and acousto-optic camera. The captured image was created from ultrasound waves with {\lambda}=0.43 mm. The fringes of the images proved that they are shadow moir\'e fringes.