The aim is to develop a rapid and direct method for measuring the bulk viscosity of a liquid as a function of temperature. Brillouin scattering of a laser beam in fresh water and salt water at different temperatures has been studied. The results show that there exists a close temperature-dependent relationship among the Brillouin frequency shift, the Brillouin linewidth, and the bulk viscosity of water. Thus the bulk viscosity of water can be determined directly from Brillouin-scattering measurements. The method has a high signal-to-noise ratio and high accuracy.
© 2003 Optical Society of America
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(280.3640) Remote sensing and sensors : Lidar
(290.3700) Scattering : Linewidth
(290.5830) Scattering : Scattering, Brillouin
Jianfeng Xu, Xiaobin Ren, Wenping Gong, Rui Dai, and Dahe Liu, "Measurement of the Bulk Viscosity of Liquid by Brillouin Scattering," Appl. Opt. 42, 6704-6709 (2003)