首页|Determination of liquid viscosity based on dual-frequency-band particle tracking
Determination of liquid viscosity based on dual-frequency-band particle tracking
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An optical-tweezers-based dual-frequency-band particle tracking system was designed and fabricated for liquid vis-cosity detection.On the basis of the liquid viscosity dependent model of the particle's restricted Brownian motion with the Faxén correction taken into account,the liquid viscosity and optical trap stiffness were determined by fitting the theoretical prediction with the measured power spectral densities of the particle's displacement and velocity that were derived from the dual-frequency-band particle tracking data.When the SiO2 beads were employed as probe particles in the measurements of different kinds of liquids,the measurement results exhibit a good agreement with the reported results,as well as a detection uncertainty better than 4.6％.This kind of noninvasive economical technique can be applied in diverse environments for both in situ and ex situ viscosity detection of liquids.
liquid viscosityoptical tweezersdual-frequency-band particle trackingpower spectral density
闫丽华、薛博引、李渊骥、冯晋霞、武兴康、张宽收
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State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China
State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Shanxi University,Taiyuan 030006,China
Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China
Modern Research Center for Traditional Chinese Medicine,Shanxi University,Taiyuan 030006,China
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National Natural Science Foundation of ChinaSpecial Foundation of Local Scientific and Technological Development Guided by Central GovernmentFundamental Research Program of Shanxi Province
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