Millimeter wave spectroscopy of rocks and fluids

TL;DR

This paper explores millimeter wave spectroscopy as a rapid, non-contact method for characterizing the bulk properties of rocks and fluid mixtures, demonstrating its sensitivity to compositional changes.

Contribution

It introduces millimeter wave spectroscopy for materials characterization, focusing on rocks and fluid mixtures, highlighting its effectiveness and rapid measurement capabilities.

Findings

Sensitive detection of composition changes in rocks and fluids

Rapid, non-contact measurement technique

Effective for multicomponent composite analysis

Abstract

One region of the electromagnetic spectrum that is relatively unexploited for materials characterization is the millimeter wave band (frequencies roughly between 40 and 300 GHz). Millimeter wave techniques involve free-space (non-contacting) measurements which have a length scale that makes them ideal for characterizing bulk properties of multicomponent composites where the scale of homogeneity is on the order of millimeters. Such composites include granular materials such as rocks, fluid mixtures, suspensions and emulsions. Here we show measurements on partially saturated rocks and an oil/water mixture, demonstrating that millimeter wave spectroscopy is sensitive yet rapid measure of changing composition.