Molecular structure dependence of acoustic nonlinearity parameter B/A for silicone oil

Abstract

Abstract Exploring new acoustic parameter is essential to develop the noninvasive imaging technique for the surgery of silicone oil tamponade. In this study, the acoustic nonlinearity parameter B/As of varied silicone oil samples (e.g. linear or hyper branched) are experimentally measured by using the modified thermodynamic method. The results show that: (1) when the concentration of the silicone oil with a molecular weight of is increased from 0.5g/100ml to 8g/100ml, the corresponding B/A value increases about 18%, but the velocity only increases by about 0.1%; and (2) when the molecular weight of the hyper branched silicone oil is enhanced from to , the B/A value increases by about 22%, while the acoustic velocity is only raised by about 0.2%. This study suggests that the B/A parameter of silicone oil is more sensitive to the change of its molecular structure than that of the acoustic velocity. Thus, B/A parameter might be utilized as an effective index for the development and optimization of the noninvasive imaging of the surgery of silicone oil tamponade.

Keywords: acoustic nonlinearity parameter molecular structure modified thermodynamic method silicone oil

Received: 15 July 2013
Revised: 17 September 2013
Accepted manuscript online:

Fund: Chinese ITER Assistant Project Foundation

Corresponding Authors: Dong Zhang

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Molecular structure dependence of acoustic nonlinearity parameter B/A for silicone oil Chin. Phys. B 0

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