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17 April 2013 Liquid viscosity measurement using super-harmonic resonance
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Viscosity sensors based on mechanical resonance, such as piezoelectric resonators, semiconductor resonators, vibrating wire resonators and our previously developed optical-fiber based resonator [1] have gained popularity due to their simplicity of design and operation. They detect viscosity by submerging an oscillating probe in the fluid of interest. Viscosity is measured by using the fact that the vibration amplitude of the probe is inversely proportional to the viscosity of the fluid. In practice, the vibration amplitudes are always kept sufficiently small in order to avoid nonlinear vibration effects. In this paper, however, nonlinear vibration is intentionally excited to improve the sensitivity of viscosity measurements, in particular super harmonic resonance case. The results show that a nonlinear effect drastically improves sensitivity to viscous damping. Experimental results and several applications are also presented.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei-Chih Wang and Chao-Shih Liu "Liquid viscosity measurement using super-harmonic resonance", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 869520 (17 April 2013);

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