Terahertz scattering and water absorption for porosimetry
Name
oe-25-22-27370.pdf
Description
Published version
Size
4.36 MB
Format
Unknown
Checksum (MD5)
813863f14dbe209880d57d12efe89969
Author(s)
Heshmat Dehkordi, Barmak
Andrews, Gordon Moseley
Naranjo-Montoya, Oscar A.
Castro-Camus, Enrique
Ciceri, Davide
Redo-Sanchez, Albert
Allanore, Antoine
Kmetz, Anthony A.
Eichmann, Shannon L.
Poitzsch, Martin E.
Date Issued
2017
Journal
Optics Express
Publisher
The Optical Society
Version
Final published version
Abstract
© 2017 Optical Society of America. We use terahertz transmission through limestone sedimentary rock samples to assess the macro and micro porosity. We exploit the notable water absorption in the terahertz spectrum to interact with the pores that are two orders of magnitude smaller (<1μm) than the terahertz wavelength. Terahertz water sensitivity provides us with the dehydration profile of the rock samples. The results show that there is a linear correlation between such a profile and the ratio of micro to macro porosity of the rock. Furthermore, this study estimates the absolute value of total porosity based on optical diffusion theory. We compare our results with that of mercury injection capillary pressure as a benchmark to confirm our analytic framework. The porosimetry method presented here sets a foundation for a new generation of less invasive porosimetry methods with higher penetration depth based on lower frequency (f<10THz) scattering and absorption. The technique has applications in geological studies and in other industries without the need for hazardous mercury or ionizing radiation.
MIT Department
Massachusetts Institute of Technology. Media Laboratory
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1364/OE.25.027370
