Patent ID: 8698378
Filing Date: 2014-04-15
Classification: G01F,G10K,Y10T

Abstract:
1. An ultrasonic transducer for use in a fluid medium, comprising: at least one piezoelectric transducer element; at least one matching body configured to provide a vibrational coupling between the piezoelectric transducer element and the fluid medium; and at least one compensating body configured to provided reduction of thermal stress and situated between the piezoelectric transducer element and the matching body, wherein the compensating body has a coefficient of thermal expansion which is between a coefficient of thermal expansion of the piezoelectric transducer element and a coefficient of thermal expansion of the matching body, wherein the compensating body has at least one of a homogenous material and macroscopically isotropic material mixture, wherein the difference between the coefficient of thermal expansion of the compensating body and the coefficient of thermal expansion of the piezoelectric transducer element is smaller than the difference between the coefficient of thermal expansion of the matching body and the coefficient of thermal expansion of the compensating body, wherein the compensating body has a material mixture including at least one matrix material and at least one filler material, and wherein the matching body is used to improve the coupling between the piezoelectric transducer element and the fluid medium.