Synchronized diffusive-wave spectroscopy: Principle and application to sound propagation in aqueous foams.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 27078418.
- Also identified by DOI 10.1103/PhysRevE.93.032611.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
We present an experimental method to measure oscillatory strains in turbid material. The material is illuminated with a laser, and the speckle patterns are recorded. The analysis of the deformations of the optical path length shows that the speckle patterns are modulated at the strain frequency. By recording those patterns synchronously with the strain source, we are able to measure the amplitude and the phase of the strain. This method is tested in the specific case of an aqueous foam where an acoustic wave propagates. The effects of material internal dynamics and heterogeneous deformations are also discussed.