Density and viscosity sensor and measuring method
US9719904B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2013 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Sep 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A density and viscosity sensor for measuring density and viscosity of a fluid, comprises: The membrane (9) has a thickness enabling transfer of mechanical vibration between the actuating/detecting element (6) and the resonating element (5).One side (11) of the piezoelectric element (10) comprises a single conductive area (13).Another side (12) of the piezoelectric element (10) comprises at least two conductive areas (14A, 14B, 14C, 14D, 14E, 14F, 14G, 14H) isolated from each other, each conductive area (14A, 14B, 14C, 14D, 14E, 14F, 14G, 14H) being coupled to an electrical potential (V1, V2) of opposite sign relatively to adjacent areas such that the resonating element (5) is driven to vibrate in a selected plane (P1, P2) perpendicular to the membrane (9).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.