NDLI: Improved diffusing wave spectroscopy based on the automatized determination of the optical transport and absorption mean free path

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Improved diffusing wave spectroscopy based on the automatized determination of the optical transport and absorption mean free path

Content Provider	Springer Nature Link
Author	Zhang, Chi Reufer, Mathias Gaudino, Danila Scheffold, Frank
Copyright Year	2017
Abstract	Diffusing wave spectroscopy (DWS) can be employed as an optical rheology tool with numerous applications for studying the structure, dynamics and linear viscoelastic properties of complex fluids, foams, glasses and gels. To carry out DWS measurements, one first needs to quantify the static optical properties of the sample under investigation, i.e. the transport mean free path l $^{}$ and the absorption length l $_{a}$. In the absence of absorption this can be done by comparing the diffuse optical transmission to a calibration sample whose l $^{}$ is known. Performing this comparison however is cumbersome, time consuming, and prone to mistakes by the operator. Moreover, already weak absorption can lead to significant errors. In this paper, we demonstrate the implementation of an automatized approach, based on which the DWS measurement procedure can be simplified significantly. By comparison with a comprehensive set of calibration measurements we cover the entire parameter space relating measured count rates (CR $_{ t }$, CR $_{ b }$) to (l $^{}$, l $_{a}$). Based on this approach we can determine l $^{}$ and la of an unknown sample accurately thus making the additional measurement of a calibration sample obsolete. We illustrate the use of this approach by monitoring the coarsening of a commercially available shaving foam with DWS.
Starting Page	241
Ending Page	247
Page Count	7
File Format	PDF
ISSN	1226119X
Journal	Korea-Australia Rheology Journal
Volume Number	29
Issue Number	4
e-ISSN	20937660
Language	English
Publisher	Korean Society of Rheology, Australian Society of Rheology
Publisher Date	2017-11-29
Publisher Place	Seoul, Melbourne
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	diffusing wave spectroscopy microrheology linear viscoelasticity light scattering Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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