Holographic interferometry for the study of liquids

TL;DR

This paper discusses holographic interferometry as an optical method to study liquids by analyzing phase changes related to temperature and concentration variations, enabling measurement of diffusion, Soret, and dissolution coefficients, as well as convective flows.

Contribution

It introduces the application of holographic interferometry for real-time analysis of liquid properties and flow dynamics, highlighting its capability to measure various coefficients and flow patterns.

Findings

Effective measurement of diffusion coefficients

Real-time visualization of convective flows

Quantitative analysis of concentration and temperature variations

Abstract

Holography is an optical technique enabling to record phase objects. Holographic interferometry uses this faculty to make a phase object interfere with a memory of itself at a preceding time, recorded on a hologram. Interference fringes therefore inform on any variation of the phase of the object. For the study of liquids, these phase changes can result from the evolution of temperature or concentration (via the index of refraction). This access to the real-time evolution of concentration can be used to measure diffusion coefficients, Soret coefficients or dissolution coefficients. Temperature fringes can be used to study convective flows.