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US 6,269,686 B1Granted
Sensor, in particular for measuring the viscosity and density of a medium
AssigneeRobert Bosch GmbH
InventorsDietmar Hahn, Gottfried Flik, Falk Herrmann
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Abstract
A sensor which has a bending reed and a piezoelectric resonator. Due to excitation by the piezoelectric resonator, the bending reed can be excited to vibration in a measurable medium. In this context, the vibration frequency and the damping of the bending reed are a function of the density and the viscosity, respectively, of the measurable medium. This can be measured by a piezoresistive element, and thus the density and viscosity of the measurable medium are ascertained.
Claims8
A sensor for measuring a viscosity and a density of a measurable medium, comprising:
- a vibration generator;
- a bending reed mechanically coupled to the vibration generator and capable of being set to a vibration in the measurable medium by the vibration generator, the measurable medium being examined by evaluating the vibration of the bending reed;
- and
- a substrate having a depression, wherein:
- the bending reed is arranged on a first side of the substrate above the depression, and
- the vibration generator is arranged on a second side of the substrate.
3 more elements
Dependencies are inferred from the claim text.