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. 2019 Mar 27;19(7):1497. doi: 10.3390/s19071497

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Brillouin frequency shift (BFS) distributions evaluated using three spectra, $B_{a} (ω)$ , $B_{r} (ω)$ and $B_{i} (ω)$ , shown by blue, orange and green curves, respectively. Frequency offset is added to orange and green curves for ease of viewing. (a) Whole map, (b) expanded view; $T_{L} = 20$ ns, $T_{S} = 2$ ns, $T_{I} = 0.5$ ns.