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Ultrasonic Horn Actuated Microprobe-based Self-calibrating Viscosity Sensor

詳細技術說明

An ultrasonic or acoustic viscosity sensor or viscometer is provided thatcan be used to accurately measure viscosity for fluid samples of less than 1 µlin volume.

*Abstract

Since the shear(non-linear vibration) and bulk (silicon horn’s λ/2 longitudinal resonance)damping can be observed at the two different frequencies, we can simultaneouslymeasure the bulk and dynamic (shear-rate dependent) viscosityof a fluid such as blood, without separating its constituents -- thus distinguishing the effect of constituents on the viscosity.

 

Furthermore, since the viscosity is a strong function of probeinsertion, a self-calibration feature has been integrated into the ultrasonic viscometer via capacitance-based immersion depth sensors that calibrates the viscosity measurement based on fluid immersion.  This capability is essential given that probe insertion depth can vary by operator.

  

Potential Applications

• Compact viscosity sensor
• Medical diagnostics, e.g. real-time whole blood viscosity measurement
• Laboratory testing, R&D, etc.

  

Advantages

• Simultaneous measurement of bulk and dynamic viscosity
• Requires very little sample volume < 1 µl
• Self-calibrating
• High sensitivity in the range of normal blood viscosity
• Configurable and tunable to measure non-Newtonian fluids based on constituent particle size
• Can be integrated into CMOS diagnostic chips

*Licensing

Patrick Govangpjg26@cornell.edu(607) 254-2330

其他

• Patent applications: US20130205875; CN103328974A
• Ramkumar,A., Lal A., “Silicon Ultrasonic Horn Actuated Microprobes BasedSelf-Calibrating Viscosity Sensors,” Proceedings of the IEEE MEMS 2010, HongKong, P:991-994

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美國