| 摘要 |
The invention provides a sensor arrangement which comprises an electroacoustic transducer (1) which is in the form of a thickness-mode transducer and accordingly has a front body (10) with a base surface (16) and an end surface (14), at least one disc-like piezoelectric element (20) with a first surface (24) and a second surface (26), and a rear body (30) with a first end face (36) and a second end face (38), wherein the end face (14) of the front body (10) is coupled to a diaphragm (40) which is suitable for emitting and receiving sonic waves. The base surface (16) of the front body (10) is connected in a cohesive and/or force-fitting manner to the first surface (24) of the piezoelectric element (20), and the second end face (36) of the rear body (30) is connected in a cohesive and/or force-fitting manner to the second surface (26) of the piezoelectric element (20). The invention makes provision for the distance (lr) between the first end face (36) and the second end face (38) of the rear body (30) plus half the thickness (d) of the piezoelectric element (20) to correspond to half the wavelength λr of a resonance oscillation of the sensor arrangement in the thickness direction (D). |
