# Spatially-resolved measurements of micro-deformations in granular materials using DWS

## TL;DR

This paper provides a tutorial on using Diffusing Wave Spectroscopy (DWS) for spatially-resolved measurement of micro-deformations in granular materials, highlighting its implementation, potential, and recent insights into strain distribution.

## Contribution

It offers a comprehensive guide to implementing DWS for granular materials, including experimental setup and potential applications, which is a recent advancement in the field.

## Key findings

- DWS enables spatially-resolved strain measurements in granular media
- The method provides new insights into strain distribution
- Experimental demonstration with standard lab equipment

## Abstract

This article is a tutorial on the practical implementation of a method of measurement of minute deformations based on multiple scattering. This technic has been recently developed and has proven to give new insights on the spatial repartition of strain in a granular material. We provide here the basics to understand the method by giving a synthetic review on Diffusing Wave Spectroscopy and multiple scattering in granular materials. We detail a simple experiment using standard lab equipment to pedagogically demonstrate the implementation of the method. Finally we give a few examples of measurements that have been obtained in other works to discuss the potential of the method.