Patent ID: 7694551
Filing Date: 2010-04-13
Classification: G01N

Abstract:
1. A sensor for measuring the viscosity of a liquid, comprising: at least one piezoelectric component configured as a resonator; at least one first starting electrode situated on a sensitive surface of the sensor; at least one second starting electrode; and at least one heating electrode provided for heating the liquid to be measured, wherein the at least one heating electrode is situated on or next to the sensitive surface of the sensor and is configured in one piece with the at least one first starting electrode, wherein the at least one heating electrode spans a surface area of the sensor having a central area, wherein the central area includes a center region, and the center region includes a center point, wherein the surface area of the sensor has an approximately uniform temperature distribution in an operating temperature range, wherein a resistance per unit of length of the at least one heating electrode varies for at least two areas of the at least one heating electrode, and wherein the resistance per unit of length of the at least one heating electrode varies as a function of distance from one of the central area, the center region, or the center point.