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Influence of Particle Size on Optical Constants From Pellets Measured With Terahertz Pulsed Spectroscopy

Bardon, T; May, RK; Taday, PF; Strlic, M; (2016) Influence of Particle Size on Optical Constants From Pellets Measured With Terahertz Pulsed Spectroscopy. IEEE Transactions on Terahertz Science and Technology , 6 (3) pp. 408-413. 10.1109/TTHZ.2016.2538641. Green open access

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Abstract

Particle size is shown to influence both the overall value and the measurement precision of the refractive index and absorption coefficient of a sample diluted with high density polyethylene (HDPE) powder and compressed in a pellet. However, excessive grinding of a sample before it is mixed with HDPE powder can result in the formation of large particle clusters. These aggregates can induce internal scattering of the terahertz pulse within the pellet as well as lead to different mechanical properties of the pellet, which may change the distribution of air pores. These phenomena result in extracted optical constants with low accuracy and precision. The present work introduces a simple experimental procedure to improve the precision and accuracy of optical constants from spectroscopic pellets. This procedure consists of moderately grinding the sample powder in fine HDPE powder with a pestle and mortar. The standard deviation of the refractive index of Prussian blue has been observed to reduce from 0.14 to 0.02 following this procedure.

Type: Article
Title: Influence of Particle Size on Optical Constants From Pellets Measured With Terahertz Pulsed Spectroscopy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TTHZ.2016.2538641
Publisher version: http://dx.doi.org/10.1109/TTHZ.2016.2538641
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/1501130
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